Carboxy-functional Silicone Elastomer Substantivity

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

There is a continuous need to improve the substantivity of silicone elastomers on keratinous substrates, such as skin, hair, and nails, to enhance their performance in cosmetic compositions by providing better dispersivity, sensory profile, and rheology modification.

Innovation Solution

The development of cosmetic compositions containing elastomers with a specific molecular structure, comprising polysiloxane moieties and carboxyl groups, which are reaction products of siloxanes and organic polyols or amines, allowing for improved film formation, substantivity, and sensory characteristics like a velvety feel.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional silicone elastomers are used in cosmetic compositions, then basic film formation and rheology modification are achieved, but substantivity on keratinous substrates is insufficient

Engineering Contradiction:

ImprovesubstantivityVSAvoidperformance enhancement

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent modifies the chemical parameters of silicone elastomers by introducing carboxyl-functional groups and varying molecular weight, creating a series of elastomers with different substantivity levels. This allows selection of optimal elastomers for specific cosmetic applications while maintaining basic film formation and rheology modification properties

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates composite elastomer systems by combining different molecular weights and carboxyl functionalities to achieve synergistic effects. These composite materials provide enhanced substantivity on keratinous substrates while maintaining the desired sensory profile and film formation characteristics

Inventive Principle:

Principle #40Composite materials

2Reliability

If elastomer concentration is increased to improve substantivity, then film formation and wear resistance improve, but dispersivity and sensory profile deteriorate

Engineering Contradiction:

ImprovesubstantivityVSAvoidsensory profile

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent introduces carboxyl groups at specific locations on the elastomer molecule (pendant carboxyls) to create localized polar regions that enhance substantivity without affecting the overall non-polar silicone backbone. This localized modification allows improved adhesion while maintaining the smooth sensory profile characteristic of silicone elastomers

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If conventional elastomers are used, then formulation simplicity is maintained, but dispersivity of powder and affinity with unctuous agents are insufficient

Engineering Contradiction:

Improveformulation simplicityVSAvoiddispersivity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The carboxyl-functional groups act as intermediary sites that bridge the non-polar silicone elastomer and polar cosmetic ingredients such as powders and unctuous agents. These functional groups improve interfacial adhesion and dispersivity without requiring complex formulation modifications

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The compositions demonstrate enhanced substantivity, dispersivity, and sensory benefits, including a velvety feel, while providing excellent formulation versatility and rheology modification for personal care and cosmetic applications.

Implementation Method 1

improve substantivity of elastomers on keratinous substrates

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 2

providing rheology modification to personal care (skin, sun, cosmetic) and healthcare formulations

Methodology Applied

Scientific EffectRheology modification: Non-Newtonian Fluids

Data Source

PatentUS10092780B2Cosmetic composition comprising a carboxy-functional elastomer

Publication Date: 2018.10.09 DOW SILICONES CORP

AI summary

A cosmetic composition is provided that includes an elastomer and at least one cosmetic component optionally in a cosmetically acceptable medium. The elastomer is according to the general formula: A-B-A or B-A-B, wherein each A independently comprises a polysiloxane moiety having at least two siloxy (Si—O) groups and wherein each B independently comprises a moiety, or a precursor thereof, having at least two carboxyl groups and wherein B is bonded to a silicon atom in A.