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Application of Polyurethane-26 in Hair Care

IP.com Disclosure Number: IPCOM000238514D
Publication Date: 2014-Sep-01
Document File: 3 page(s) / 843K

Publishing Venue

The IP.com Prior Art Database

Related People

Solvay: OWNER

Abstract

Polyurethane-26 is capable of anchoring itself at the hair surface and to resisit rinsing. Many hair care benefits are expected from its deposition.

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Application of Polyurethane-26 in Hair Care

Definition, Chemical Structure & Characteristics of Polyurethane-26

Definition given by the Personal Care Products Council (Formerly CTFA) for Polyurethane-26 is the following: Polyurethane-26 is a complex polymer that is formed by the reaction of Polyperfluoroethoxymethoxy Difluorohydroxyethyl Ether and isophorone diisocyanate (IPDI) to form a prepolymer. The prepolymer is further reacted with 3-diethylamino-1,2-propanediol followed by the capping of any residual isocyanate groups with 2-ethyl-1-hexanol. The resulting polymer is neutralized with acetic acid.

Polyperfluoroethoxymethoxy Difluorohydroxyethyl Ether

Isophorone Diisocyanate

3-Diethylamino-1,2-Propanediol

2-Ethyl-1-Hexanol

The final structure of the polyurethane is the following:

The experiments described in this disclosure have been carried out using Fluorolink® 5032 supplied by Solvay Specialty Polymers. It has a molecular weight of about 15000 g/mol and a cationic charge density of about 0.25 meq/g. It is supplied as a self-preserved slightly hazy aqueous dispersion having a solid content of approximately 25% by weight and a pH around 4.

Properties of Polyurethane-26

To determine the affinity of Polyurethane-26 for hair, a hair tress made of bleached Caucasian hair is immersed for 3 min in an aqueous solution of Fluorolink® 5032 at 0.5% of solids by weight. Then, it is rinsed for 30 s under running water. Afterwards, the hair tress is left to dry and equilibrate overnight in a climatic room (21°C, 50% H.R.).

It can be visually noticed that heavy deposition occurred through the treatment. Compared to untreated hair, hair treated with the Fluorolink® 5032 solution has a more rigid look. By touching the hair with the fingers, it is also possible to feel that hair is much less supple and that an ingredient gets deposited onto the hair. Taking into account that the treatment solution only contains Polyurethane-26 as an ingredient but water, and that the hair has been rinsed after the treatment with the Fluorolink® 5032 solution, hence removing Polyurethane-26 that would not have been adsorbed at the hair surface during the treatment, it can be concluded that Polyurethane-26 has a strong affinity for hair and that it gets adsorbed at the hair surface.

Deposition of Polyurethane-26 onto bleached Caucasian hair has been further evidenced by looking at the water repellency property of the hair. While a small water droplet quickly spreads and penetrates into the hair assembly when hair is untreated, it stays at the hair surface and does not penetrate into the hair assembly when treated with the Fluorolink® solution. 30min after having deposited the water droplets at the surface of the hair tress, the droplets still haven’t penetrated into the hair assembly when hair is treated with the Fluorolink® solution (see photo on the right hand side).

The friction coefficient of the hair treated with the Fluorolink® 5032 solution was measured in...