Seiwa Kasei’s New Protein Polymer Retains Color

Protesil JLH (INCI: Trimethylsilyl Hydrolyzed Pea Protein PG-Propyl Methylsilanediol Crosspolymer, Water) is a new hybrid polymer from Seiwa Kasei that the Japanese supplier says combines the hair care benefits of plant protein, the smooth feel of silicone and the hydrophobicity of alkyl groups to repair damage caused by coloring and daily stress.

The ingredient is recommended for use in color care shampoo, color care treatment and hair masks.

An Antidote to Build-Up

In the hair color market, company officials say polymer compounds that coat hair’s surface are widely used to improve color development and color retention. However, Seiwa Kasei contends excessive accumulation of these ingredients on the hair surface may lead to build-up, resulting in issues such as a heavy appearance and reduced hair texture.

To address these issues, Seiwa Kasei has developed the multi-functional hybrid polymer. Composed of protein (hydrolyzed protein), a silicone backbone and alkyl groups as proprietary color-care ingredient, Protesil JLH is based on a plant-derived protein moiety. Key features include hair color retention by forming a uniform coating on the hair surface; suppressing excessive adsorption of conditioning polymers, allowing excessive ingredients to be removed during shampooing and supporting the formation of a uniform coating film; and damage repair. The protein moiety in the structure adsorbs onto the hair and helps repair damage caused by hair-coloring and daily stress.