Fire-Retardant Molded Hook Fastener Resin Composition

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Solution Overview

Problem

Molded hook fasteners made from PEI-based resin face challenges with poor moldability, leading to insufficient engaging force and compromised fire retardancy and low fuming properties when attempting to improve moldability by blending with other resins.

Innovation Solution

A resin composition is developed by mixing polyester-based elastomer resin with PEI-based resin in a specific weight ratio, enhancing moldability without significantly impairing fire retardancy and low fuming properties, and incorporating a bromine-based or phosphorus-based organic fire retardant to further improve performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If PEI-based resin is used for molded hook fastener, then fire retardancy and low fuming property are improved, but moldability deteriorates

Engineering Contradiction:

Improvefire retardancyVSAvoidmoldability

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent uses a composite resin system combining PEI-based resin with polyester-based elastomer resin and polyamide-based resin. This composite approach allows the PEI to provide fire retardancy while the other resins improve moldability and flexibility, resolving the contradiction between fire safety and manufacturability

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the resin composition parameters by adding specific elastomers and polyamides in controlled ratios, changing the physical and chemical properties of the resin system to achieve both fire retardancy and improved moldability simultaneously

Inventive Principle:

Principle #35Parameter changes

2Object-generated harmful factors

If PEI-based resin is used for molded hook fastener, then low fuming property is improved, but engaging force deteriorates

Engineering Contradiction:

Improvefuming resistanceVSAvoidengaging force

Core Design Contradiction:

Object-generated harmful factorsVSStrength

Solution Approach 1:

The composite resin system combines PEI's low fuming property with polyester elastomer's mechanical flexibility and polyamide's strength characteristics, achieving both low fuming emissions and sufficient engaging force through material synergism

Inventive Principle:

Principle #40Composite materials

3Ease of manufacture

If resin is blended to improve moldability, then ease of manufacture is improved, but fire retardancy deteriorates

Engineering Contradiction:

ImprovemoldabilityVSAvoidfire retardancy

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent carefully controls the blending ratios of resin components, using polyester-based elastomer resin (30-70 parts) and polyamide-based resin (10-40 parts) relative to PEI-based resin (30-70 parts), optimizing the balance between moldability enhancement and fire retardancy preservation

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP3516978B1Fire-retardant and low-fuming molded male hook-and-loop fastener

Publication Date: 2021.06.30 KURARAY FASTENING CO LTD

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AI summary

The present invention relates to a molded hook fastener having excellent fire retardancy and low fuming property, and having a substrate and a large number of engaging elements projecting from a surface of the substrate, wherein both the substrate and the engaging elements contain a resin composition in which a polyester-based elastomer resin (A) and a polyetherimide-based resin (B) are mixed with a weight ratio (A)/(B) in a range of 2/98 to 70/30.