Polyether Polycarbonate Hair Cosmetic Composition

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing hair cosmetic compositions face challenges in achieving sufficient hair set retention while allowing restyling without stickiness, as increasing set polymer content can lead to hardened hair and using oil components results in lower retention and stickiness issues.

Innovation Solution

A hair cosmetic composition incorporating a polyether polycarbonate with a specific structural unit, which exhibits selective self-adhesive properties, allowing for restyling with high retention and minimal stickiness, and is soluble in common solvents for easy formulation and handling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the amount of set polymer is increased to improve hair set retention, then hair set retention is improved, but the styled hair becomes hardened or roughened

Engineering Contradiction:

Improvehair set retentionVSAvoidhair hardening and roughening

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical structure parameters of the polymer by introducing a polyether polycarbonate with specific structural units (formula 1) containing alkylene groups and ether bonds. This structural modification allows the polymer to provide strong hair set retention while maintaining hair flexibility and preventing hardening, as the polyether segments provide flexibility and the polycarbonate segments provide adhesion strength.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite polymer structure combining polyether segments (providing flexibility and softness) with polycarbonate segments (providing adhesion and retention). This composite structure at the molecular level allows the material to simultaneously achieve strong hair set retention and prevent hair hardening, resolving the contradiction between retention strength and hair softness.

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If the amount of oil component is increased to improve restyling capability, then restyling capability is improved, but hair set retention becomes much lower

Engineering Contradiction:

Improverestyling capabilityVSAvoidhair set retention

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent modifies the polymer parameters by selecting a polyether polycarbonate with specific molecular weight (10,000-1,000,000) and structural composition. This parameter optimization allows the polymer to provide both strong initial hair set retention and sufficient restyling capability, as the polyether segments provide flexibility for restyling while the polycarbonate segments ensure strong adhesion.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the oil content is increased to improve hair set retention, then hair set retention is improved, but the hair becomes sticky

Engineering Contradiction:

Improvehair set retentionVSAvoidstickiness

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters by using a polyether polycarbonate with specific structural units containing C2-C6 alkylene groups. This structural parameter change provides strong hair set retention through the polycarbonate segments while the polyether segments prevent stickiness by providing flexibility and reducing surface adhesion to hands and objects.

Inventive Principle:

Principle #35Parameter changes

4Reliability

If a set polymer with sufficient hair set retention and restyling capability is used, then hair set retention and restyling are improved, but stickiness occurs

Engineering Contradiction:

Improvehair set retentionVSAvoidstickiness

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by creating different functional segments within the polymer chain: polycarbonate segments localized for strong adhesion and retention, and polyether segments localized for flexibility and anti-stickiness. This local differentiation of material properties within the single polymer structure allows simultaneous achievement of strong hair set retention, restyling capability, and minimal stickiness.

Inventive Principle:

Principle #3Local quality

5Adaptability or versatility

If a polymer with selective self-adhesive property is used to achieve restyling and reduce stickiness, then restyling and non-stickiness are improved, but the polymer dissolves only in specific solvents

Engineering Contradiction:

Improverestyling capabilityVSAvoidsolvent compatibility

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent optimizes the polymer parameters by controlling the structural unit composition (formula 1), molecular weight (10,000-1,000,000), and polyether/polycarbonate ratio. These parameter adjustments enable the polymer to maintain selective self-adhesive properties for restyling and non-stickiness while improving solubility in commonly used cosmetic solvents through appropriate molecular weight selection and structural composition.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP2379052B1Hair cosmetic composition

Publication Date: 2013.10.02 KAO CORP

AI summary

A hair cosmetic composition containing a polyether polycarbonate having a structural unit represented by the following formula (1): [wherein A represents a C2 to C6 alkylene group; n represents an average number of 5 to 1,000; p represents an average number of 5 to 100; and (n x p) units of AO may be the same or not].