{"id":12929,"date":"2026-11-03T08:00:00","date_gmt":"2026-11-03T07:00:00","guid":{"rendered":"https:\/\/wthgmbh.de\/?p=12929"},"modified":"2026-09-21T17:18:29","modified_gmt":"2026-09-21T15:18:29","slug":"antioxidants-in-styrene-block-copolymers-sbs-sis-part-4","status":"publish","type":"post","link":"https:\/\/wthgmbh.de\/en\/blog\/antioxidants-in-styrene-block-copolymers-sbs-sis-part-4\/","title":{"rendered":"Antioxidants in Styrene Block Copolymers (SBS, SIS) \u2013 Part 4"},"content":{"rendered":"\n

Thermoplastic Elastomers:<\/u><\/strong><\/h2>\n\n\n\n

Antioxidants in Styrene Block Copolymers (SBS, SIS) \u2013 Part 4<\/h2>\n\n\n\n

Styrene block copolymers such as SBS (Styrene-Butadiene-Styrene) and SIS (Styrene-Isoprene-Styrene) are susceptible to thermal and oxidative degradation. To ensure longer service life, color stability, and mechanical resistance, antioxidants are used.<\/p>\n\n\n\n

1. Primary Antioxidants \u2013 Free Radical Scavengers<\/strong><\/h2>\n\n\n\n

These antioxidants interrupt the chain reaction of free radicals, protecting the polymer from oxidative degradation:<\/p>\n\n\n\n

\"\"
WTH-AN 1010 G<\/figcaption><\/figure>\n\n\n\n

Hindered Phenols<\/strong> prevent degradation at moderate temperatures. They are effective in SBS\/SIS for consumer goods, packaging, and soft-touch applications.<\/p>\n\n\n\n

Additives from the WTH product range: WTH-AN 1010, WTH-AN 1076<\/strong><\/p>\n\n\n\n

\"\"
WTH-AN 1076<\/figcaption><\/figure>\n\n\n\n

Thioether-Phenol Combinations<\/strong> enhance long-term protection, particularly for thermally stressed applications.<\/p>\n\n\n\n

Additive from the WTH product range: WTH-Chemnox AN-1520<\/strong><\/p>\n\n\n\n

2. Secondary Antioxidants \u2013 Peroxide Decomposers<\/strong><\/h2>\n\n\n\n

These prevent thermal degradation by breaking down hydroperoxides:<\/p>\n\n\n\n

Phosphite Antioxidants<\/strong> are particularly effective in extrusion and injection molding of SBS\/SIS, stabilizing the material during processing and preventing yellowing.<\/p>\n\n\n\n

\"\"
WTH-AN 168<\/figcaption><\/figure>\n\n\n\n

Additive from the WTH product range: WTH-Chemnox AN 168<\/strong><\/p>\n\n\n\n

Thioether Antioxidants<\/strong> are effective in high-temperature applications with significant ozone and UV exposure, such as DLTDP (Dilaurylthiodipropionate) and DSTDP (Distearylthiodipropionate).<\/strong><\/p>\n\n\n\n

3. Synergistic Combinations for Maximum Protection<\/strong><\/h2>\n\n\n\n

A combination of primary and secondary antioxidants is often the best choice:<\/p>\n\n\n\n

    \n
  • WTH-AN 1010 + WTH-AN 168<\/strong> \u2192 Prevents thermal and oxidative degradation.<\/li>\n\n\n\n
  • WTH-AN 1076 + DLTDP<\/strong> \u2192 Ideal for high-temperature applications.<\/li>\n\n\n\n
  • HALS + Phenol Antioxidants<\/strong> \u2192 Optimal for UV-sensitive applications.<\/li>\n<\/ul>\n\n\n\n

    Conclusion<\/strong><\/h2>\n\n\n\n

    For SBS and SIS TPEs, hindered phenols<\/strong> (e.g., WTH-AN 1010<\/strong>) are ideal for long-term protection. When combined with phosphite antioxidants<\/strong> (WTH-AN 168<\/strong>), thermal stability during processing is also improved. For applications exposed to high UV or ozone levels, HALS or thioether antioxidants<\/strong> are recommended.<\/p>\n","protected":false},"excerpt":{"rendered":"

    tyrene block copolymers such as SBS (Styrene-Butadiene-Styrene) and SIS (Styrene-Isoprene-Styrene) are susceptible to thermal and oxidative degradation. To ensure longer service life, color stability, and mechanical resistance, antioxidants are used.<\/p>\n","protected":false},"author":38,"featured_media":12468,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[94,201],"tags":[461,462,449],"class_list":["post-12929","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-magazinbeitraege-en","category-technology-and-products","tag-sbs","tag-sis","tag-tpr"],"_links":{"self":[{"href":"https:\/\/wthgmbh.de\/en\/wp-json\/wp\/v2\/posts\/12929","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wthgmbh.de\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wthgmbh.de\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wthgmbh.de\/en\/wp-json\/wp\/v2\/users\/38"}],"replies":[{"embeddable":true,"href":"https:\/\/wthgmbh.de\/en\/wp-json\/wp\/v2\/comments?post=12929"}],"version-history":[{"count":1,"href":"https:\/\/wthgmbh.de\/en\/wp-json\/wp\/v2\/posts\/12929\/revisions"}],"predecessor-version":[{"id":12930,"href":"https:\/\/wthgmbh.de\/en\/wp-json\/wp\/v2\/posts\/12929\/revisions\/12930"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/wthgmbh.de\/en\/wp-json\/wp\/v2\/media\/12468"}],"wp:attachment":[{"href":"https:\/\/wthgmbh.de\/en\/wp-json\/wp\/v2\/media?parent=12929"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wthgmbh.de\/en\/wp-json\/wp\/v2\/categories?post=12929"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wthgmbh.de\/en\/wp-json\/wp\/v2\/tags?post=12929"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}