{"id":90,"date":"2021-06-29T13:43:10","date_gmt":"2021-06-29T04:43:10","guid":{"rendered":"https:\/\/www.j-vp.co.jp\/english\/?page_id=90"},"modified":"2025-11-25T18:11:51","modified_gmt":"2025-11-25T09:11:51","slug":"modified","status":"publish","type":"page","link":"https:\/\/www.j-vp.co.jp\/english\/s_pva\/modified","title":{"rendered":"Modified POVAL"},"content":{"rendered":"\n<p>Modified POVAL refers to polyvinyl alcohols containing functional groups other than the hydroxyl and acetate groups found in general POVAL. JVP offers commercially available D Polymer, which contains carbonyl groups, and A Polymer, which contains carboxyl groups. Additionally, various other types of modified POVAL are available upon request.<\/p>\n\n\n\n<ul class=\"is-style-jvp_list_menuLink spva\"><li><a href=\"#sec01\">D Polymer<\/a><\/li><li><a href=\"#sec02\">A Polymer<\/a><\/li><li><a href=\"#sec03\">Other Modified POVAL<\/a><\/li><\/ul>\n\n\n\n<h2 class=\"is-style-jvp_title_h2 spva\" id=\"sec01\">Specialty POVAL\uff3bD Polymer\uff3d<\/h2>\n\n\n\n<p class=\"is-style-default\">D Polymer is a PVOH that has highly reactive &#8220;carbonyl groups&#8221; as a &nbsp;modified group other than the hydroxyl and acetate groups. The carbonyl group reacts with hydrazide groups and amino groups and in particular it has an especially high reactivity with hydrazide base cross-linking agents, and it can also form coatings and &nbsp;films&nbsp; that do not dissolve even in boiling water. It can be used to produce highly transparent gels.<\/p>\n\n\n\n<h3 class=\"is-style-jvp_title_h3 spva\">Structural Formula<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" width=\"414\" height=\"240\" src=\"https:\/\/www.j-vp.co.jp\/english\/wp-content\/uploads\/2025\/11\/spva01en.png\" alt=\"\" class=\"wp-image-964\" srcset=\"https:\/\/www.j-vp.co.jp\/english\/wp-content\/uploads\/2025\/11\/spva01en.png 414w, https:\/\/www.j-vp.co.jp\/english\/wp-content\/uploads\/2025\/11\/spva01en-300x174.png 300w\" sizes=\"(max-width: 414px) 100vw, 414px\" \/><\/figure>\n\n\n\n<h3 class=\"is-style-jvp_title_h3 spva\">Grade and Quality Specifications<\/h3>\n\n\n\n<div class=\"wp-block-group is-style-jvp_group_spScroll\"><div class=\"wp-block-group__inner-container\">\n<table style=\"width: 100%; height: 185px;\">\n<tbody>\n<tr style=\"height: 37px;\">\n<td style=\"background-color: #e5dbeb; width: 21.1712%; height: 37px;\">Grade<\/td>\n<td style=\"background-color: #fffcdb; width: 12.6126%; text-align: center; height: 37px;\">DF-05<\/td>\n<td style=\"background-color: #fffcdb; width: 13.4009%; text-align: center; height: 37px;\">DF-10<\/td>\n<td style=\"background-color: #fffcdb; width: 13.0631%; text-align: center; height: 37px;\">DF-17<\/td>\n<td style=\"background-color: #fffcdb; width: 13.6261%; text-align: center; height: 37px;\">DF-20<\/td>\n<td style=\"background-color: #fffcdb; width: 12.9505%; text-align: center; height: 37px;\">DM-17<\/td>\n<td style=\"background-color: #fffcdb; width: 12.9505%; text-align: center; height: 37px;\">DM-20<\/td>\n<\/tr>\n<tr style=\"height: 37px;\">\n<td style=\"background-color: #e5dbeb; height: 37px; width: 21.1712%;\">Hydrolysis (mol%)<\/td>\n<td style=\"text-align: center; height: 37px; width: 52.7027%;\" colspan=\"4\">98~99<\/td>\n<td style=\"text-align: center; height: 37px; width: 27.901%;\" colspan=\"4\">95.5~97.5<\/td>\n<\/tr>\n<tr style=\"height: 37px;\">\n<td style=\"background-color: #e5dbeb; height: 37px; width: 21.1712%;\">4% aq. Viscosity (mPa\u00b7s)<\/td>\n<td style=\"text-align: center; height: 37px; width: 12.6126%;\">5.5\u00b12.5<\/td>\n<td style=\"text-align: center; height: 37px; width: 13.4009%;\">11\u00b11.5<\/td>\n<td style=\"text-align: center; height: 37px; width: 13.0631%;\">23\u00b13<\/td>\n<td style=\"text-align: center; height: 37px; width: 13.6261%;\">28.5\u00b13<\/td>\n<td style=\"text-align: center; height: 37px; width: 12.9505%;\">21\u00b13<\/td>\n<td style=\"text-align: center; height: 37px; width: 12.9505%;\">28\u00b13<\/td>\n<\/tr>\n<tr style=\"height: 37px;\">\n<td style=\"background-color: #e5dbeb; height: 37px; width: 21.1712%;\">Volatiles (%)<\/td>\n<td style=\"text-align: center; height: 37px; width: 52.7027%;\" colspan=\"6\">6.0 or less<\/td>\n<\/tr>\n<tr style=\"height: 37px;\">\n<td style=\"background-color: #e5dbeb; height: 37px; width: 21.1712%;\">Sodium Acetate (%)<\/td>\n<td style=\"text-align: center; height: 37px; width: 78.6037%;\" colspan=\"6\">1.5 or less<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div><\/div>\n\n\n\n<h3 class=\"is-style-jvp_title_h3 spva\">Characteristics<\/h3>\n\n\n\n<ul class=\"spva is-style-jvp_list_arrow\"><li>D Polymer is water-soluble and can be dissolved in water.<\/li><li>The aqueous solution of D Polymer exhibits excellent viscosity stability and resists gelation even when stored at low temperature for extended periods.<\/li><li>The incorporated carbonyl groups provide high chemical reactivity.<\/li><li>Low surface tension in aqueous solutions contributes to superior\u00a0wettability.<\/li><\/ul>\n\n\n\n<h3 class=\"is-style-jvp_title_h3 spva\">Applications<\/h3>\n\n\n\n<ul class=\"spva is-style-jvp_list_arrow\"><li>Water-resistant coatings in combination with cross-linking agents<\/li><li>Emulsifiers for polyvinyl acetate emulsions<\/li><li>Water-resistant adhesives and binders<\/li><li>Hydrogels<\/li><\/ul>\n\n\n\n<h4 class=\"is-style-jvp_title_h4 spva\">D Polymer Uses (Conceptual Illustrations)<\/h4>\n\n\n\n<figure class=\"wp-block-image size-full is-style-jvp_image_pcOnly\"><img loading=\"lazy\" width=\"1000\" height=\"455\" src=\"https:\/\/www.j-vp.co.jp\/english\/wp-content\/uploads\/2025\/11\/spva02en.png\" alt=\"\" class=\"wp-image-966\" srcset=\"https:\/\/www.j-vp.co.jp\/english\/wp-content\/uploads\/2025\/11\/spva02en.png 1000w, https:\/\/www.j-vp.co.jp\/english\/wp-content\/uploads\/2025\/11\/spva02en-300x137.png 300w, https:\/\/www.j-vp.co.jp\/english\/wp-content\/uploads\/2025\/11\/spva02en-768x349.png 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-style-jvp_image_spOnly\"><img loading=\"lazy\" width=\"495\" height=\"768\" src=\"https:\/\/www.j-vp.co.jp\/english\/wp-content\/uploads\/2025\/11\/spva02en_sp.png\" alt=\"\" class=\"wp-image-965\" srcset=\"https:\/\/www.j-vp.co.jp\/english\/wp-content\/uploads\/2025\/11\/spva02en_sp.png 495w, https:\/\/www.j-vp.co.jp\/english\/wp-content\/uploads\/2025\/11\/spva02en_sp-193x300.png 193w\" sizes=\"(max-width: 495px) 100vw, 495px\" \/><\/figure>\n\n\n\n<h3 class=\"is-style-jvp_title_h3 spva\">Cross-linking Agents<\/h3>\n\n\n\n<p>The carbonyl groups in D Polymer react efficiently with hydrazide and amino groups. Consequently, compounds bearing multiple hydrazide or amino groups are effective as cross\u2011linkers. Notably, hydrazide-based cross\u2011linkers enable cross\u2011linking at room temperature without additional heating.<\/p>\n\n\n\n<div class=\"wp-block-group is-style-jvp_group_spScroll\"><div class=\"wp-block-group__inner-container\">\n<figure class=\"wp-block-table\">\n<table style=\"text-align: center; width: 100%; height: 116px;\">\n<thead style=\"border-bottom: 0;\">\n<tr style=\"height: 38px;\">\n<th style=\"height: 38px; background-color: #fffcdb;\">Cross-linking Agent<\/th>\n<th style=\"height: 38px; background-color: #fffcdb;\">Water Resistance of<br>Cross-linked Film<\/th>\n<th style=\"height: 38px; background-color: #fffcdb;\">Pot Life<sup>\u203b<\/sup><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"height: 41px;\">\n<td style=\"height: 41px;\">Adipic dihydrazide (ADH)<\/td>\n<td style=\"height: 41px;\">\u25ef<\/td>\n<td style=\"height: 41px;\">Approximately 24 hours<\/td>\n<\/tr>\n<tr style=\"height: 37px;\">\n<td style=\"height: 37px;\">Ethylenediamine<\/td>\n<td style=\"height: 37px;\">\u25b3<\/td>\n<td style=\"height: 37px;\">Over 7 days<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<\/div><\/div>\n\n\n\n<p class=\"has-text-align-right has-p-font-size\">\u203b5% aqueous solution of DF-17 with cross-linking agent (ADH) (5wt%\/D Polymer) stored at 20\u02daC.<\/p>\n\n\n\n<h3 class=\"is-style-jvp_title_h3 spva\">Water-resistant Properties of Cross-linked Films<\/h3>\n\n\n\n<p>When combined with an appropriate cross\u2011linking agent, D Polymer forms films that remain insoluble even in boiling water. This makes it highly suitable for water\u2011resistant overcoat layers on heat\u2011sensitive papers.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" width=\"475\" height=\"308\" src=\"https:\/\/www.j-vp.co.jp\/english\/wp-content\/uploads\/2025\/11\/spva03en.png\" alt=\"\" class=\"wp-image-967\" srcset=\"https:\/\/www.j-vp.co.jp\/english\/wp-content\/uploads\/2025\/11\/spva03en.png 475w, https:\/\/www.j-vp.co.jp\/english\/wp-content\/uploads\/2025\/11\/spva03en-300x195.png 300w\" sizes=\"(max-width: 475px) 100vw, 475px\" \/><\/figure><\/div>\n\n\n<div style=\"padding: 1em; background-color: #f2f2f2;\">\n<p style=\"text-decoration: underline;\">Film preparation conditions<\/p>\n<p style=\"padding-left: 1em;\"><span style=\"display: block; padding-left: 5.5em; text-indent: -5.5em;\">Procedure: Cross-linked films were made by drying the mixture solution of D Polymer and cross-linking agent at 20\u02daC, 65%RH for 48 hours.<\/span>D Polymer: DF-17<br>Cross-linking agent: Adipic dihydrazide (ADH) 5%\/PVOH<\/p>\n<p style=\"margin-top: 20px; text-decoration: underline;\">Evaluation Procedure<\/p>\n<p style=\"padding-left: 1em;\">The amounts of water-insoluble components were measured after the films were soaked in water at 30\u02daC for 24 hours or at 95\u02daC for 1 hour.<\/p>\n<\/div>\n\n\n<h3 class=\"is-style-jvp_title_h3 spva\">Stability of the Aqueous Solution of D Polymer with Cross-linking Agent<\/h3>\n\n\n\n<p>The aqueous solution of D Polymer with cross-linking agent experiences viscosity changes over time, eventually leading to gelation. However, by adding certain agents such as isopropanolamine and acetone, the \u201cpot life\u201d can be extended significantly&#8211;to several months&#8211;without compromising the water-resistant properties.<\/p>\n\n\n\n<div class=\"wp-block-group is-style-jvp_group_spScroll\"><div class=\"wp-block-group__inner-container\">\n<figure class=\"wp-block-table is-style-regular\">\n<table style=\"width: 100%; height: 224px; text-align: center;\">\n<colgroup>\n<col>\n<col style=\"width: 21.8%;\">\n<col style=\"width: 21.8%;\">\n<col> <\/colgroup>\n<thead style=\"border-bottom: 0;\">\n<tr style=\"height: 37px; background-color: #fffcdb;\">\n<th style=\"height: 37px; text-align: center; background-color: #fffcdb;\">Cross-linking Agent (%\/PVOH)<\/th>\n<th style=\"height: 37px; background-color: #fffcdb;\" colspan=\"2\">Additives (%\/PVOH)<\/th>\n<th style=\"height: 75px; background-color: #fffcdb;\" rowspan=\"2\">Pot Life<sup>\u203b<\/sup><\/th>\n<\/tr>\n<tr style=\"height: 38px; background-color: #fffcdb;\">\n<th style=\"height: 38px; background-color: #fffcdb;\">Adipic dihydrazide<\/th>\n<th style=\"height: 38px; background-color: #fffcdb;\">Isopropanolamine<\/th>\n<th style=\"height: 38px; background-color: #fffcdb;\">Acetone<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"height: 38px;\">\n<td style=\"height: 149px;\" rowspan=\"4\">5<\/td>\n<td style=\"height: 38px;\">0<\/td>\n<td style=\"height: 38px;\">0<\/td>\n<td style=\"height: 38px;\">A few hours<\/td>\n<\/tr>\n<tr style=\"height: 37px;\">\n<td style=\"height: 37px;\">0<\/td>\n<td style=\"height: 37px;\">10<\/td>\n<td style=\"height: 37px;\">3 days<\/td>\n<\/tr>\n<tr style=\"height: 37px;\">\n<td style=\"height: 37px;\">2<\/td>\n<td style=\"height: 37px;\">0<\/td>\n<td style=\"height: 37px;\">13 days<\/td>\n<\/tr>\n<tr style=\"height: 37px;\">\n<td style=\"height: 37px;\">2<\/td>\n<td style=\"height: 37px;\">10<\/td>\n<td style=\"height: 37px;\">60 days<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<\/div><\/div>\n\n\n\n<p class=\"has-text-align-right has-p-font-size\">\u203b10% aqueous solution of DF-17 with cross-linking agent (ADH) (5%\/PVOH) stored at 20\u02daC.<\/p>\n\n\n\n<h3 class=\"is-style-jvp_title_h3 spva\">Surface Tension of D Polymer<\/h3>\n\n\n\n<div class=\"wp-block-group is-style-jvp_group_spScroll\"><div class=\"wp-block-group__inner-container\">\n<figure class=\"wp-block-table is-style-jvp_table_simple01\">\n<table style=\"text-align: center; height: 150px; width: 100%;\">\n<colgroup>\n<col style=\"width: 26%;\">\n<col>\n<col>\n<col>\n<col> <\/colgroup>\n<tbody>\n<tr style=\"height: 38px;\">\n<td style=\"height: 38px; background-color: #e5dbeb; text-align: left;\">&nbsp;<\/td>\n<td style=\"height: 38px; background-color: #fffcdb;\" colspan=\"2\">D Polymer<\/td>\n<td style=\"height: 38px; background-color: #fffcdb;\" colspan=\"2\">General PVOH<\/td>\n<\/tr>\n<tr style=\"height: 38px;\">\n<td style=\"text-align: left; height: 38px; background-color: #e5dbeb;\">Grade<\/td>\n<td style=\"height: 38px;\">DF-17<\/td>\n<td style=\"height: 38px;\">DM-17<\/td>\n<td style=\"height: 38px;\">JF-17<\/td>\n<td style=\"height: 38px;\">JM-17<\/td>\n<\/tr>\n<tr style=\"height: 37px;\">\n<td style=\"text-align: left; height: 37px; background-color: #e5dbeb;\">Hydrolysis (mol%)<\/td>\n<td style=\"height: 37px;\">98.5<\/td>\n<td style=\"height: 37px;\">96.5<\/td>\n<td style=\"height: 37px;\">98.5<\/td>\n<td style=\"height: 37px;\">96.5<\/td>\n<\/tr>\n<tr style=\"height: 37px;\">\n<td style=\"text-align: left; height: 37px; background-color: #e5dbeb;\">Surface Tension (\uff4dN\/m)<sup>\u203b<\/sup><\/td>\n<td style=\"height: 37px;\">57<\/td>\n<td style=\"height: 37px;\">51<\/td>\n<td style=\"height: 37px;\">66<\/td>\n<td style=\"height: 37px;\">60<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<\/div><\/div>\n\n\n\n<p class=\"has-text-align-right has-p-font-size\">\u203bMethod: Pendant drop, Concentration: 0.2%, Temperature: 20\u02daC.<\/p>\n\n\n\n<h2 class=\"is-style-jvp_title_h2 spva\" id=\"sec02\">Specialty POVAL Anion Modified POVAL [A Polymer]<\/h2>\n\n\n\n<p>A Polymer is a modified POVAL containing carboxyl groups in addition to hydroxyl and acetate groups. Due to the presence of these anionic functional groups, it exhibits enhanced water solubility compared to general POVAL and enables applications that utilize the reactivity of the carboxyl groups.<\/p>\n\n\n\n<h3 class=\"is-style-jvp_title_h3 spva\">Structural Formula<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" width=\"414\" height=\"218\" src=\"https:\/\/www.j-vp.co.jp\/english\/wp-content\/uploads\/2025\/11\/spva04en.png\" alt=\"\" class=\"wp-image-968\" srcset=\"https:\/\/www.j-vp.co.jp\/english\/wp-content\/uploads\/2025\/11\/spva04en.png 414w, https:\/\/www.j-vp.co.jp\/english\/wp-content\/uploads\/2025\/11\/spva04en-300x158.png 300w\" sizes=\"(max-width: 414px) 100vw, 414px\" \/><\/figure>\n\n\n\n<h3 class=\"is-style-jvp_title_h3 spva\">Grade and Quality Specifications<\/h3>\n\n\n\n<div class=\"wp-block-group is-style-jvp_group_spScroll\"><div class=\"wp-block-group__inner-container\">\n<table style=\"width: 100%; height: 183px;\">\n<tbody>\n<tr style=\"height: 37px;\">\n<td style=\"background-color: #e5dbeb; width: 22%; height: 37px;\">Grade<\/td>\n<td style=\"background-color: #fffcdb; width: 15.6%; text-align: center; height: 37px;\">AP-10<\/td>\n<td style=\"background-color: #fffcdb; width: 15.6%; text-align: center; height: 37px;\">AP-17<\/td>\n<td style=\"background-color: #fffcdb; width: 15.6%; text-align: center; height: 37px;\">AF-17<\/td>\n<td style=\"background-color: #fffcdb; width: 15.6%; text-align: center; height: 37px;\">AHF-17<\/td>\n<td style=\"background-color: #fffcdb; width: 15.6%; text-align: center; height: 37px;\">ALT-17<\/td>\n<\/tr>\n<tr style=\"height: 37px;\">\n<td style=\"background-color: #e5dbeb; height: 37px;\">Hydrolysis (mol%)<\/td>\n<td style=\"text-align: center; height: 37px;\" colspan=\"2\">88~90<\/td>\n<td style=\"text-align: center; height: 37px;\">96.5 or more<\/td>\n<td style=\"text-align: center; height: 37px;\">92 or more<\/td>\n<td style=\"text-align: center; height: 37px;\">91~93<\/td>\n<\/tr>\n<tr style=\"height: 37px;\">\n<td style=\"background-color: #e5dbeb; height: 37px;\">4% aq. Viscosity (mPa\u00b7s)<\/td>\n<td style=\"text-align: center; height: 37px;\">11\u00b11<\/td>\n<td style=\"text-align: center; height: 37px;\">28\u00b13<\/td>\n<td style=\"text-align: center; height: 37px;\">30\u00b13<\/td>\n<td style=\"text-align: center; height: 37px;\">30\u00b17<\/td>\n<td style=\"text-align: center; height: 37px;\">25\u00b15<\/td>\n<\/tr>\n<tr style=\"height: 37px;\">\n<td style=\"background-color: #e5dbeb; height: 37px;\">Volatiles (%)<\/td>\n<td style=\"text-align: center; height: 37px;\" colspan=\"5\">7.0 or less<\/td>\n<\/tr>\n<tr style=\"height: 37px;\">\n<td style=\"background-color: #e5dbeb; height: 35px; width: 21.1712%;\">Sodium Acetate (%)<\/td>\n<td style=\"text-align: center; height: 35px; width: 78.6036%;\" colspan=\"5\">3.0 or less<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div><\/div>\n\n\n\n<h3 class=\"is-style-jvp_title_h3 spva\">Characteristics<\/h3>\n\n\n\n<ul class=\"hp-spvalist spva is-style-jvp_list_arrow\"><li>Highly soluble in water compared to general POVAL.<\/li><li>Water-resistant properties achievable through reactions involving carboxyl groups.<\/li><li>Minimal foaming in aqueous solutions.<\/li><li>Excellent viscosity stability in aqueous solutions.<\/li><li>Superior adhesion to polyester and metals.<\/li><li>Forms complexes with specific metallic salts (e.g., aluminum sulfate).<\/li><\/ul>\n\n\n\n<h3 class=\"is-style-jvp_title_h3 spva\">Applications<\/h3>\n\n\n\n<ul class=\"hp-spvalist spva is-style-jvp_list_arrow\"><li>Water-soluble films<\/li><li>Water-resistant coatings in combination with cross-linking agents<\/li><li>Sizing agents for paper<\/li><\/ul>\n\n\n\n<h3 class=\"is-style-jvp_title_h3 spva\">Water Solubility of Films<\/h3>\n\n\n\n<p>Due to its higher water solubility compared to general POVAL, A Polymer is suitable for various water-soluble films, such as unit-dose packaging for laundry and dish detergents.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" width=\"553\" height=\"362\" src=\"https:\/\/www.j-vp.co.jp\/english\/wp-content\/uploads\/2025\/11\/spva05en.png\" alt=\"\" class=\"wp-image-969\" srcset=\"https:\/\/www.j-vp.co.jp\/english\/wp-content\/uploads\/2025\/11\/spva05en.png 553w, https:\/\/www.j-vp.co.jp\/english\/wp-content\/uploads\/2025\/11\/spva05en-300x196.png 300w\" sizes=\"(max-width: 553px) 100vw, 553px\" \/><\/figure><\/div>\n\n\n<div style=\"padding: 1em; background-color: #f2f2f2;\">\n<p style=\"text-decoration: underline;\">Film preparation conditions<\/p>\n<p style=\"padding-left: 1em;\">Films were made by drying the aqueous solution of A Polymer at 20\u02daC, 65%RH for 48 hours.<\/p>\n<p style=\"margin-top: 20px; text-decoration: underline;\">Evaluation Procedure<\/p>\n<p style=\"padding-left: 1em;\">Film dissolution time was measured after the films (thickness: 40\u03bcm) were soaked in water at 20\u02daC.<\/p>\n<\/div>\n\n\n<h3 class=\"is-style-jvp_title_h3 spva\">Cross-linking Agent<\/h3>\n\n\n\n<div class=\"wp-block-group is-style-jvp_group_spScroll\"><div class=\"wp-block-group__inner-container\">\n<figure class=\"wp-block-table is-style-regular\">\n<table style=\"width: 100%; height: 78px;\">\n<thead style=\"border-bottom: 0;\">\n<tr style=\"height: 41px;\">\n<th class=\"has-text-align-center\" style=\"background-color: #fffcdb; height: 41px;\" data-align=\"center\">Cross-linking Agent<\/th>\n<th class=\"has-text-align-center\" style=\"background-color: #fffcdb; height: 41px;\" data-align=\"center\">Water Resistance of<br>Cross-linked Film<\/th>\n<th class=\"has-text-align-center\" style=\"background-color: #fffcdb; height: 41px;\" data-align=\"center\">Pot Life<sup>\u203b<\/sup><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"height: 37px;\">\n<td class=\"has-text-align-center\" style=\"height: 37px;\" data-align=\"center\">Polyamide epichlorohydrin (PAE) resin<\/td>\n<td class=\"has-text-align-center\" style=\"height: 37px;\" data-align=\"center\">\u25ef<\/td>\n<td class=\"has-text-align-center\" style=\"height: 37px;\" data-align=\"center\">Approximately 48 hours<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<\/div><\/div>\n\n\n\n<p class=\"has-text-align-right has-p-font-size\">\u203b5% aqueous solution of ALT-17 with cross-linking agent (PAE) resin (5%\/PVOH) stored at 20\u02daC.<\/p>\n\n\n\n<h3 class=\"is-style-jvp_title_h3 spva\">Water-resistant Properties of Cross-linked Films<\/h3>\n\n\n\n<p>Cross-linked films of A Polymer with PAE resin are insoluble even in hot water. For water-resistant films, we recommend the newly commercialized ALT-17 grade.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" width=\"443\" height=\"308\" src=\"https:\/\/www.j-vp.co.jp\/english\/wp-content\/uploads\/2025\/11\/spva06en.png\" alt=\"\" class=\"wp-image-970\" srcset=\"https:\/\/www.j-vp.co.jp\/english\/wp-content\/uploads\/2025\/11\/spva06en.png 443w, https:\/\/www.j-vp.co.jp\/english\/wp-content\/uploads\/2025\/11\/spva06en-300x209.png 300w\" sizes=\"(max-width: 443px) 100vw, 443px\" \/><\/figure><\/div>\n\n\n<div style=\"padding: 1em; background-color: #f2f2f2;\">\n<p style=\"text-decoration: underline;\">Film preparation conditions<\/p>\n<p style=\"padding-left: 1em;\"><span style=\"display: block; padding-left: 5.5em; text-indent: -5.5em;\">Procedure: Cross-linked films were made by drying the mixture solution of A Polymer and cross-linking agent.<\/span> <span style=\"display: block; padding-left: 7.3em; text-indent: -7.3em;\">Drying process: (i) 20\u02daC, 65%RH for 2 days,<br \/>(ii) 65\u02daC for 3 hours.<\/span> A Polymer: ALT-17 <span style=\"display: block; padding-left: 9.4em; text-indent: -9.4em;\">Cross-linking agent: Polyamide epichlorohydrin (PAE) resin 10%\/PVOH<\/span><\/p>\n<p style=\"margin-top: 20px; text-decoration: underline;\">Evaluation Procedure<\/p>\n<p style=\"padding-left: 1em;\">The amounts of water-insoluble components were measured after the films were soaked in water at 30\u02daC for 24 hours or 95\u02daC for 1 hour.<\/p>\n<\/div>\n\n\n<h2 class=\"is-style-jvp_title_h2 spva\" id=\"sec03\">&nbsp;<strong>Specialty POVAL Other Modified POVAL<\/strong><\/h2>\n\n\n\n<p class=\"is-style-jvp_p_lead\">JVP is developing modified POVAL with the following characteristics and is seeking applications for them. We specialize in producing products that meet customer needs. Please contact us if you are interested.<\/p>\n\n\n\n<div class=\"wp-block-columns is-style-jvp_columns_point\">\n<div class=\"wp-block-column\">\n<div class=\"wp-block-group is-style-jvp_group_point spva\"><div class=\"wp-block-group__inner-container\">\n<h3 class=\"has-text-align-center is-style-jvp_title_point spva has-hs-font-size\">Hydrophilic PVOH<\/h3>\n\n\n\n<p>This non-ionic hydrophilic group is used to make PVOH hydrophilic and it is flexible.<\/p>\n<\/div><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column\">\n<div class=\"wp-block-group is-style-jvp_group_point spva\"><div class=\"wp-block-group__inner-container\">\n<h3 class=\"has-text-align-center is-style-jvp_title_point spva has-hs-font-size\">Hydrophobic PVOH<\/h3>\n\n\n\n<p>This PVOH has a long-chain alkyl group. It has high viscosity even at lower concentrations and exhibits thixotropic viscosity.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-style-jvp_columns_point\">\n<div class=\"wp-block-column\">\n<div class=\"wp-block-group is-style-jvp_group_point spva\"><div class=\"wp-block-group__inner-container\">\n<h3 class=\"has-text-align-center is-style-jvp_title_point spva has-hs-font-size\">Ultra water-soluble PVOH<\/h3>\n\n\n\n<p>This PVOH is more water-soluble than exiting PVOHs.<\/p>\n<\/div><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-column\">\n<div class=\"wp-block-group is-style-jvp_group_point spva\"><div class=\"wp-block-group__inner-container\">\n<h3 class=\"has-text-align-center is-style-jvp_title_point spva has-hs-font-size\">Other<\/h3>\n\n\n\n<p>JVP truly wishes to meet the needs of customers who would like us to add a particular functional group to PVOH.<br>Please let us know your needs.<\/p>\n<\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-style-jvp_group_bgFull\"><div class=\"wp-block-group__inner-container\">\n<h2 class=\"is-style-jvp_title_section spva has-hm-font-size\">Specialty POVAL List<\/h2>\n\n\n\n<ul class=\"is-style-jvp_list_brotherLink spva\"><li><a href=\"https:\/\/www.j-vp.co.jp\/english\/s_pva\/jmr\" data-type=\"page\" data-id=\"88\">JMR<\/a><\/li><li><a href=\"https:\/\/www.j-vp.co.jp\/english\/s_pva\/hensei\" data-type=\"page\" data-id=\"90\">Modified POVAL<\/a><\/li><li><a href=\"https:\/\/www.j-vp.co.jp\/english\/s_pva\/pe\" data-type=\"page\" data-id=\"93\">Pharmaceutical grade POVAL<\/a><\/li><li><a href=\"https:\/\/www.j-vp.co.jp\/english\/s_pva\/px\" data-type=\"page\" data-id=\"95\">Sodium-free POVAL<\/a><\/li><\/ul>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"Modified POVAL refers to polyvinyl alcohols containing fu...","protected":false},"author":1,"featured_media":0,"parent":25,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"tmp-spva.php","meta":[],"_links":{"self":[{"href":"https:\/\/www.j-vp.co.jp\/english\/wp-json\/wp\/v2\/pages\/90"}],"collection":[{"href":"https:\/\/www.j-vp.co.jp\/english\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.j-vp.co.jp\/english\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.j-vp.co.jp\/english\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.j-vp.co.jp\/english\/wp-json\/wp\/v2\/comments?post=90"}],"version-history":[{"count":123,"href":"https:\/\/www.j-vp.co.jp\/english\/wp-json\/wp\/v2\/pages\/90\/revisions"}],"predecessor-version":[{"id":981,"href":"https:\/\/www.j-vp.co.jp\/english\/wp-json\/wp\/v2\/pages\/90\/revisions\/981"}],"up":[{"embeddable":true,"href":"https:\/\/www.j-vp.co.jp\/english\/wp-json\/wp\/v2\/pages\/25"}],"wp:attachment":[{"href":"https:\/\/www.j-vp.co.jp\/english\/wp-json\/wp\/v2\/media?parent=90"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}