Hydrogenated asymmetric long-chain branched sbs polymer and method for its preparation

CN116987237BActive Publication Date: 2026-07-03CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2022-04-25
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing SEBS polymers are prone to producing long polyethylene chains during hydrogenation, resulting in defects such as poor oil absorption, poor oil locking performance, and large permanent deformation. In addition, the synthesis methods are complex and costly.

Method used

Asymmetric long-chain branched SBS polymers were synthesized by anionic polymerization. The copolymerization of butadiene and divinylbenzene was controlled through a three-stage polymerization process, combined with hydrogenation, to form a hydrogenated asymmetric long-chain branched structure, ensuring uniform distribution and high degree of hydrogenation of styrene and butadiene units.

Benefits of technology

It achieves high oil filling, low deformation, good physical and mechanical properties and mineral oil compatibility, and is suitable for high oil filling soft products. The preparation method is simple and low cost.

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Abstract

This invention discloses a hydrogenated asymmetric long-chain branched SBS polymer and its preparation method. The polymer is obtained by selective hydrogenation of a branched styrene-butadiene / divinylbenzene-styrene triblock copolymer with high vinyl content and asymmetric long chains. The polymer exhibits a bimodal narrow distribution and a dendritic structure with asymmetric long-chain branching. It possesses characteristics such as high oil fillability, high oil retention, low deformation, high cohesiveness, and high tensile strength, exhibiting superior overall physical properties compared to existing SEBS.
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