Flame Retardant Polyester Resin for Artificial Hair

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Solution Overview

Problem

Artificial hair fibers made from vinyl chloride resin have poor heat resistance, while those made from polyester resin are combustible, necessitating the need for improved flame retardancy and compatibility of bromine-based flame retardants with polyester resin to maintain transparency and combability.

Innovation Solution

A resin composition comprising 100 parts of polyester with 5-40 parts of bromine-containing flame retardants such as poly(pentabromobenzyl acrylate) and a flame retardant auxiliary agent with a specific average particle diameter, achieving a melt viscosity of 80-300 Pa·s, which enhances flame retardancy, transparency, and combability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If vinyl chloride resin is used for artificial hair fibers, then workability and low cost are improved, but heat resistance deteriorates causing fusion and frizzing at hair iron temperatures

Engineering Contradiction:

ImproveworkabilityVSAvoidheat resistance

Core Design Contradiction:

Ease of manufactureVSTemperature

Solution Approach 1:

The patent changes the chemical composition parameters by using polyester resin instead of vinyl chloride resin, and by controlling the melt viscosity within 80-300 Pa·s range, achieving both good workability and heat resistance at hair iron temperatures

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite resin composition combining polyester resin with specific flame retardants (bromine-containing compounds and antimony compound), achieving a material that maintains the base resin's workability while adding heat resistance and flame retardancy properties

Inventive Principle:

Principle #40Composite materials

2Temperature

If polyester resin is used for artificial hair fibers, then heat resistance is improved, but combustibility worsens creating burn hazards

Engineering Contradiction:

Improveheat resistanceVSAvoidcombustibility

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful combustibility of polyester into a benefit by incorporating flame retardants that activate during combustion, creating a synergistic effect that suppresses flame spread and reduces burn hazards while maintaining heat resistance

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent introduces flame retardant compounds (bromine-containing flame retardant and antimony compound) as intermediary substances that mediate between the polyester resin and oxygen, preventing direct combustion and reducing fire hazards

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If bromine-based flame retardant is added to polyester, then flame retardancy is improved, but transparency and combability deteriorate due to poor distribution

Engineering Contradiction:

Improveflame retardancyVSAvoidtransparency

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent optimizes the melt viscosity parameter to 80-300 Pa·s, which enables proper distribution of flame retardant particles throughout the polyester matrix, achieving uniform dispersion that maintains transparency while ensuring effective flame retardancy

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent ensures uniform local distribution of flame retardant particles throughout the resin composition, creating consistent flame retardant properties across all regions while maintaining overall transparency and combability

Inventive Principle:

Principle #3Local quality

4Reliability

If bromine-based flame retardant is added to polyester, then flame retardancy is improved, but combability deteriorates

Engineering Contradiction:

Improveflame retardancyVSAvoidcombability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent optimizes the melt viscosity parameter to 80-300 Pa·s, which ensures proper distribution of flame retardant particles that do not interfere with fiber surface properties, maintaining good combability while achieving effective flame retardancy

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a homogeneous resin composition where flame retardant particles are uniformly distributed without agglomeration, ensuring consistent flame retardant performance while maintaining fiber surface smoothness for good combability

Inventive Principle:

Principle #33Homogeneity

5Manufacturing precision

If antimony compound particle diameter is limited, then transparency is improved, but flame retardancy becomes insufficient

Engineering Contradiction:

ImprovetransparencyVSAvoidflame retardancy

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent optimizes the particle diameter parameter of the antimony compound to achieve a balance where particles are small enough to maintain transparency but sufficiently sized and distributed to provide effective flame retardancy through synergistic interaction with bromine-containing flame retardant

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10905183B2Resin composition for artificial hair and molded body of same

Publication Date: 2021.02.02 DENKA CO LTD

AI summary

A resin composition for flame retardant artificial hair which has favorable transparency and combability similar to those of human hair and exhibits excellent flame retardancy. A resin composition for flame retardant artificial hair is obtained by configuring a resin composition including 100 parts by mass of a polyester (A) and 5-40 parts by mass of a bromine-containing flame retardant (B) including at least one kind selected from poly(pentabromobenzyl acrylate), a brominated phenol resin, and polydibromophenylene oxide, wherein the melt viscosity of the polyester (A) is 80-300 Pa·s.