Carboxylic Acid Modified Nitrile Copolymer Latex for Surgical Gloves
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Solution Overview
Problem
Nitrile-based rubber gloves lack the elasticity and softness required for applications like surgical gloves, where comfort and long-term wear are crucial, due to inferior properties compared to natural rubber gloves, and existing attempts to improve these properties through cross-linking agents often compromise tensile strength and durability.
Innovation Solution
A carboxylic acid-modified nitrile-based copolymer latex is developed, with specific adjustments to capillary viscosity and monomer ratios to enhance the elasticity and softness of nitrile-based rubber gloves, incorporating a conjugated diene-based monomer, ethylenic unsaturated nitrile-based monomer, and ethylenic unsaturated acid monomer, optimized through controlled polymerization processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nitrile-based latex is used to replace natural rubber for dip molding, then chemical resistance and allergy prevention are improved, but elasticity and softness deteriorate
Solution Approach 1:
The patent modifies the molecular structure parameters of nitrile-based copolymer latex by incorporating specific monomer ratios (acrylonitrile 20-30%, butadiene 65-75%, and carboxylic acid-containing monomer 2-10%) to change the physical properties of the resulting glove material, achieving both chemical resistance and improved elasticity
Solution Approach 2:
The patent creates a composite polymer structure by copolymerizing multiple monomers (acrylonitrile, butadiene, and carboxylic acid-containing monomers) to combine the chemical resistance of nitrile groups with the elasticity provided by carboxylic acid groups and diene structures
2Ease of operation
If cross-linking agents are changed or added to improve elasticity and softness, then wearing comfort is improved, but tensile strength and durability deteriorate
Solution Approach 1:
The patent extracts the dependency on external cross-linking agents by incorporating carboxylic acid groups directly into the polymer chain structure, allowing the polymer itself to provide the necessary elasticity and softness without compromising mechanical strength through external additives
3Ease of operation
If sulfur or vulcanization accelerator is excessively used to improve cross-linking, then elasticity is improved, but discoloration and IV type allergy occur
Solution Approach 1:
The patent converts the harmful effects of excessive sulfur and vulcanization accelerators by replacing them with carboxylic acid-containing monomers that provide cross-linking functionality without causing discoloration or allergic reactions, thus turning a harmful cross-linking method into a safe one
Data Source
AI summary
The present technology provides a carboxylic acid-modified nitrile-based copolymer latex including a carboxylic acid-modified nitrile-based copolymer including a conjugated diene-based monomer-derived unit, an ethylenic unsaturated nitrile-based monomer-derived unit, and an ethylenic unsaturated acid monomer-derived unit, wherein the carboxylic acid-modified nitrile-based copolymer latex satisfies General Formulas 1 and General Formula 2.