A silicone-polyurethane block copolymer and use thereof

By using an organosilicon-polyurethane block copolymer with an ABA-type triblock structure of (polyester-urethane)-(siloxane)-(polyester-urethane) to solve the problems of lip gloss products such as sticking, cracking, and poor color fixation, the flexibility and durability of high molecular weight copolymers are achieved. The film layer does not crack during lip use and the pigment does not fall off.

CN122302210APending Publication Date: 2026-06-30广州科创材料科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
广州科创材料科技有限公司
Filing Date
2026-03-12
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing lip gloss products suffer from problems such as sticking and migration, cracking and dryness, and poor color retention. In particular, the urea bonds introduced by amino silicone oil cause film hardening and yellowing, and the low reactivity of hydroxyl-terminated silicone oil makes it difficult to effectively extend the chain with isocyanate, resulting in poor film-forming performance.

Method used

The organosilicon-polyurethane block copolymer with a (polyester-urethane)-(siloxane)-(polyester-urethane) ABA-type triblock structure is formed by chain extension of HO-PDMS-OH with small molecule diols to form a high molecular weight copolymer. The combination of siloxane segments and silicone resin interpenetrating network structure achieves flexibility and strong color fixation.

Benefits of technology

It achieves the flexibility and durability of high molecular weight copolymers in lip cosmetics. The film layer is crack-free under 20% tensile strain, color difference ΔE≤0.6, pigment residue rate after friction ≥91%, and the film layer is comfortable and does not dry out the skin.

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Abstract

This invention belongs to the field of cosmetics and discloses an organosilicon-polyurethane block copolymer. The organosilicon-polyurethane block copolymer has a (polyester-urethane)-(siloxane)-(polyester-urethane) structure, and the average molecular weight of the organosilicon-polyurethane block copolymer is 30,000 to 100,000. This invention successfully introduces HO-PDMS-OH, which has relatively mild reactivity, as a block copolymer component instead of a simple end-capping agent into the polyurethane backbone to avoid migration. At the same time, the siloxane blocks in the copolymer have excellent compatibility with the silicone resin in the formulation. The two form an interpenetrating network structure at the molecular level. The silicone resin provides a rigid skeleton and strong color fixation, the polyester-urethane segments of the copolymer provide adhesion, and the siloxane segments provide flexibility and hydrophobicity. As a result, the prepared cosmetic has no visible cracks under 20% tensile strain, and the film can freely stretch and contract with lip movements, without the tightness of traditional long-lasting lip glosses.
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