Sealant Resin Composition for Heat-Sealing Strength and Low Elution
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Solution Overview
Problem
Conventional resin compositions for sealants lack sufficient heat-seal strength and exhibit high elution amounts into normal heptane, which are critical for hygiene and packaging performance.
Innovation Solution
A resin composition comprising an ethylene-(meth)acrylic acid ester copolymer with a methacrylic acid ester unit content between 10% to 25% and a tackifying resin content between 0.1% to 10% by mass, along with optional ethylene-vinyl ester copolymer and ethylene-α-olefin copolymer elastomer, to enhance heat-sealing strength and reduce elution into normal heptane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional resin compositions for sealants are used, then the composition can be manufactured with standard formulations, but the heat-seal strength to substrate is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters by specifying an ethylene-(meth)acrylic acid ester copolymer with 10-25% methacrylic acid ester unit content and controlling the tackifying resin content at 0.1-10% by mass, thereby achieving both sufficient heat-seal strength and acceptable sealing performance
Solution Approach 2:
The patent creates a composite resin composition by combining the ethylene-(meth)acrylic acid ester copolymer (resin A) with tackifying resin (resin B) in specific proportions, where the synergistic interaction between these components achieves both improved heat-seal strength and maintained sealing reliability
2Object-affected harmful factors
If conventional resin compositions are used, then the formulation is simpler, but the elution amount into normal heptane is high which compromises hygiene
Solution Approach 1:
The patent reduces the elution amount into normal heptane by carefully controlling the methacrylic acid ester unit content at 10-25% and the tackifying resin content at 0.1-10% by mass, thereby achieving hygiene standards while maintaining composition simplicity
Solution Approach 2:
The patent applies local quality by selecting specific resin components with particular properties - the ethylene-(meth)acrylic acid ester copolymer provides low elution characteristics in the 10-25% methacrylic acid ester range, while the tackifying resin provides adhesion with minimal elution at 0.1-10% content
Data Source
AI summary
A resin composition for a sealant has excellent heat-sealing strength with respect to a substrate, and a reduced elution amount thereof into normal heptane.A resin composition for a sealant includes: a resin (A) which is an ethylene-(meth)acrylic acid ester copolymer in which a content of a (meth)acrylic acid ester unit is from 10% by mass to 25% by mass; and a tackifying resin (B), in which a content of the resin (A) is more than 45% by mass with respect to a total amount of resin components in the resin composition for a sealant, and a content of the tackifying resin (B) is from 0.1% by mass to 10% by mass with respect to the total amount of the resin components in the resin composition for a sealant.