Polymer Latex Composition for Hypoallergenic Elastomeric Films
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Solution Overview
Problem
Existing polymer latex compositions used in manufacturing elastomeric articles, such as gloves, face challenges in achieving high tensile strength and elongation while avoiding allergic reactions and the use of sulfur vulcanization systems, which can cause hypersensitivity and require alternative methods to maintain mechanical properties and softness.
Innovation Solution
A polymer latex composition is developed using free-radical emulsion polymerization with ethylenically unsaturated monomers, incorporating silane compounds with terminal functional groups and thermally reversible bonds, allowing for the formation of elastomeric films without sulfur vulcanization, enhancing tensile strength, elongation, and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If sulfur vulcanization systems are used to achieve high tensile strength and elongation, then mechanical properties are improved, but allergic reactions (Type-I and Type-IV hypersensitivity) occur due to residual latex proteins and sulfur-containing accelerators
Solution Approach 1:
The invention extracts and removes the harmful sulfur vulcanization system from the latex composition while maintaining the beneficial mechanical properties through alternative crosslinking mechanisms using silane compounds and thermally reversible bonds
Solution Approach 2:
The invention creates a composite latex system combining latex polymer particles with silane compounds and thermally reversible bond formers, achieving both hypoallergenic properties and high mechanical strength through the synergistic interaction of components
2Strength
If sulfur-containing accelerators are used in vulcanization to improve mechanical properties, then tensile strength is enhanced, but Type-IV hypersensitivity (allergic contact dermatitis) is caused
Solution Approach 1:
The invention completely eliminates sulfur-containing accelerators from the system, replacing them with silane-based crosslinking agents that provide equivalent or superior mechanical properties without causing allergic contact dermatitis
3Strength
If standard sulfur vulcanization is used to achieve desired mechanical properties, then film strength is improved, but the composition requires complex vulcanization agents and accelerators
Solution Approach 1:
The invention removes the complex sulfur vulcanization system including multiple accelerators and activators, replacing it with a simplified silane-based crosslinking system that achieves similar mechanical properties with fewer components
Solution Approach 2:
The invention changes the chemical parameters of the crosslinking system from sulfur-based to silane-based chemistry, fundamentally altering the vulcanization mechanism while simplifying the overall composition
4Strength
If conventional polymer latex is used to achieve high tensile strength, then mechanical strength is improved, but softness of the film is reduced
Solution Approach 1:
The invention creates a composite system where silane compounds and thermally reversible bonds work synergistically with the latex polymer to achieve both high tensile strength and enhanced softness through controlled crosslinking density and flexibility
Solution Approach 2:
The invention optimizes the molecular weight, functional group content, and crosslinking density parameters of the silane compounds to achieve the desired balance between strength and softness in the final film
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The polymer latex composition achieves improved mechanical properties and softness in elastomeric films, reducing allergic reactions by eliminating sulfur vulcanization, and extending pot life, while maintaining high tensile strength and elongation.
Implementation Method 1
particles of a latex polymer obtained by free-radical emulsion polymerization of a composition comprising ethylenically unsaturated monomers
Implementation Method 2
a silane compound comprising (II-a) at least two terminal silane functional groups and (II-b) a thermally reversible bond
Data Source
AI summary
The present invention relates to a polymer latex composition, to a method for the preparation of such a polymer latex composition, to the use of said polymer latex composition for the production of elastomeric articles, to a compounded latex composition comprising said polymer latex composition, to a method for making dip-molded articles, to a method for making elastomeric articles and to articles made by using said polymer latex composition.