{"id":783,"date":"2018-02-08T16:37:36","date_gmt":"2018-02-08T13:37:36","guid":{"rendered":"https:\/\/materialwizard.com.ua\/?p=783"},"modified":"2026-06-07T09:12:51","modified_gmt":"2026-06-07T06:12:51","slug":"j-4-chain-extender","status":"publish","type":"post","link":"https:\/\/materialwizard.com.ua\/en\/j-4-chain-extender\/","title":{"rendered":"Multifunctional compatibilizer J-4"},"content":{"rendered":"<p><\/p>\n<h3>Description<\/h3>\n<p><\/p>\n<p>J-4 is a multifunctional reactive compatibilizer and chain extender for condensation polymers (PET, PBT, PC, PA66, PA6). Its epoxy functional groups react with the terminal carboxyl and hydroxyl groups of polyesters and polycarbonates, building up molecular weight and restoring melt viscosity when reprocessing recyclate. It improves hydrolytic stability, enhances physical and mechanical properties, and makes it possible to combine any pair of condensation polymers. An alternative to BASF Joncryl ADR 4368 in chain extension applications.<\/p>\n<h3>Key properties<\/h3>\n<ul>\n<li>Epoxy chain extender \u2014 restores the molecular weight of PET\/PBT\/PA66<\/li>\n<li>Improves the hydrolytic stability of condensation polymers<\/li>\n<li>Reactive compatibilization of PET-PC, PA-PBT and other blends<\/li>\n<li>Improves melt viscosity when reprocessing recyclate<\/li>\n<li>Low dosage: 0.3-1.0 % of polymer weight<\/li>\n<li>Compatible with injection molding, extrusion and blow molding<\/li>\n<\/ul>\n<h3>Applications<\/h3>\n<p><strong>PET and PBT recycling.<\/strong> Restoring the IV (intrinsic viscosity) of recycled PET \u2014 for bottles, hot-fill containers, films. Particularly effective when reprocessing rPBT for automotive use.<\/p>\n<p><strong>Hydrolysis-resistant PA66 and PBT.<\/strong> Improved hydrolysis resistance in parts operating in high-humidity conditions (engine compartment, household appliances).<\/p>\n<p><strong>Condensation polymer blends.<\/strong> PC-PBT, PA-PET, PA-PC \u2014 compatibilization for technical parts.<\/p>\n<p><strong>Bottle production from recyclate.<\/strong> Restoring rPET properties for bottle-to-bottle recycling.<\/p>\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Description J-4 is a multifunctional reactive compatibilizer and chain extender for condensation polymers (PET, PBT, PC, PA66, PA6). Its epoxy functional groups react with the terminal carboxyl and hydroxyl groups of polyesters and polycarbonates, building up molecular weight and restoring melt viscosity when reprocessing recyclate. It improves hydrolytic stability, enhances physical and mechanical properties, and [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":635,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[36],"tags":[],"class_list":["post-783","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-compatibilizers"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>J-4 Chain Extender \u2014 Joncryl ADR 4368 Alternative | MW<\/title>\n<meta name=\"description\" content=\"Buy J-4 epoxy chain extender for PET, PBT, PA66 and PC \u2014 restores rPET molecular weight. BASF Joncryl ADR 4368 alternative. Material Wizard.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/materialwizard.com.ua\/en\/j-4-chain-extender\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"J-4 Chain Extender \u2014 Joncryl ADR 4368 Alternative | MW\" \/>\n<meta property=\"og:description\" content=\"Buy J-4 epoxy chain extender for PET, PBT, PA66 and PC \u2014 restores rPET molecular weight. BASF Joncryl ADR 4368 alternative. 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Material Wizard.\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/materialwizard.com.ua\\\/j-4-chain-extender\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/materialwizard.com.ua\\\/j-4-chain-extender\\\/\"},\"author\":{\"name\":\"admin\",\"@id\":\"https:\\\/\\\/materialwizard.com.ua\\\/#\\\/schema\\\/person\\\/dca276cf78b76cd5e4d5c6e6eb529fad\"},\"headline\":\"Multifunctional compatibilizer J-4\",\"datePublished\":\"2018-02-08T13:37:36+00:00\",\"dateModified\":\"2026-06-07T06:12:51+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/materialwizard.com.ua\\\/j-4-chain-extender\\\/\"},\"wordCount\":531,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/materialwizard.com.ua\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/materialwizard.com.ua\\\/j-4-chain-extender\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/materialwizard.com.ua\\\/wp-content\\\/uploads\\\/2017\\\/12\\\/Kompatibilizatory.jpg\",\"articleSection\":[\"Compatibilizers\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/materialwizard.com.ua\\\/j-4-chain-extender\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/materialwizard.com.ua\\\/en\\\/j-4-chain-extender\\\/\",\"url\":\"https:\\\/\\\/materialwizard.com.ua\\\/en\\\/j-4-chain-extender\\\/\",\"name\":\"J-4 Chain Extender \u2014 Joncryl ADR 4368 Alternative | MW\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/materialwizard.com.ua\\\/en\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/materialwizard.com.ua\\\/en\\\/j-4-chain-extender\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/materialwizard.com.ua\\\/j-4-chain-extender\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/materialwizard.com.ua\\\/wp-content\\\/uploads\\\/2017\\\/12\\\/Kompatibilizatory.jpg\",\"datePublished\":\"2018-02-08T13:37:36+00:00\",\"dateModified\":\"2026-06-07T06:12:51+00:00\",\"description\":\"Buy J-4 epoxy chain extender for PET, PBT, PA66 and PC \u2014 restores rPET molecular weight. 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