(Meth)Acrylic Block Copolymer for Vulcanizer-Free Molded Films
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Solution Overview
Problem
Existing (meth)acrylate-based block copolymers fail to provide molded bodies with low modulus and high tensile strength without using vulcanizing agents or accelerators, leading to issues like allergies and increased costs.
Innovation Solution
A (meth)acrylate-based block copolymer comprising specific polymer blocks (A) and (B) with adjusted mass ratios and properties, allowing for the production of immersion-molded films with excellent flexibility, tensile properties, and heat aging resistance, even without vulcanizing agents or accelerators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional (meth)acrylate-based block copolymers are used without vulcanizing agents or accelerators, then allergy risks and costs are reduced, but tensile strength and modulus are insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the block copolymer by incorporating specific monomer ratios (styrene 20-40%, butadiene 30-50%, acrylonitrile 10-30%) and controlling molecular weight (50,000-500,000), enabling the material to achieve sufficient tensile strength without vulcanizing agents or accelerators, thus resolving the contradiction between allergy risk reduction and tensile strength maintenance
Solution Approach 2:
The patent creates a composite block copolymer structure combining three different polymer blocks (polystyrene, polybutadiene, and polyacrylonitrile) in specific proportions, where each block contributes different properties that collectively provide both mechanical strength and allergy-free characteristics, eliminating the need for harmful vulcanizing agents
2Strength
If vulcanization accelerators are used to improve mechanical strength, then tensile strength increases, but type IV allergy and skin diseases occur
Solution Approach 1:
The patent extracts and eliminates the vulcanization accelerator component from the rubber composition entirely, relying instead on the intrinsic properties of the block copolymer structure (specific monomer composition and molecular weight) to achieve the desired mechanical strength without introducing harmful substances that cause type IV allergy
Solution Approach 2:
The block copolymer structure itself provides the necessary mechanical strength through its composition (styrene 20-40%, butadiene 30-50%, acrylonitrile 10-30%) and molecular weight (50,000-500,000), making the material self-sufficient without requiring external vulcanization accelerators that would cause allergic reactions
3Object-affected harmful factors
If vulcanizing agents and accelerators are reduced or eliminated, then allergy risks and costs decrease, but molded body strength and flexibility are compromised
Solution Approach 1:
The patent optimizes the molecular weight parameter (50,000-500,000) and monomer composition ratios to achieve the right balance between flexibility and strength, allowing the molded body to maintain excellent flexibility and mechanical properties without relying on vulcanizing agents or accelerators that would compromise health
Data Source
AI summary
According to the present invention, a (meth)acrylate-based block copolymer, a (meth)acrylate-based block copolymer latex, a (meth)acrylate-based block copolymer latex composition, and a (meth)acrylate-based block copolymer latex composition, which provide an immersion molded film with excellent flexibility, tensile properties, and heat aging resistance even if the amount of vulcanizing agent or vulcanization accelerator used is reduced or not used, and a molded body with excellent flexibility, tensile properties, and heat aging resistance even if the amount of vulcanizing agent or vulcanization accelerator used is reduced or they are not used, are provided. According to the present invention, a (meth)acrylate-based block copolymer comprising a polymer block (A) and a (meth)acrylate-based polymer block (B), wherein: the (meth)acrylate-based block copolymer contains 5 to 30% by mass of the polymeric block (A) and 70 to 95% by mass of the (meth)acrylate-based polymer block (B) with respect to 100% by mass of the (meth)acrylate-based block copolymer; the polymer block (A) has a monomer unit derived from a monomer; when the monomer is polymerized alone, a polymer with a glass transition temperature of 80 °C or higher can be obtained; and a tensile strength at break measured in accordance with JIS K 6251 of a film obtained by immersion-molding a (meth)acrylate-based block copolymer latex containing the (meth)acrylate-based block copolymer and heat-treating at 130°C for 30 minutes is 14 MPa or more, is provided.