Antistatic Gloves via Rubber Latex Blending
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Elastomeric articles, such as gloves, face challenges in achieving both antistatic properties and comfort due to the limitations of natural rubber's static resistivity and the aesthetic and contamination issues associated with adding conductive carbon black, while existing manufacturing techniques struggle with chemical incompatibility and delamination in multilayered designs.
Innovation Solution
A method of creating rubber elastomeric articles with antistatic properties by blending non-leachable polymeric antistatic agents with elastomeric materials, such as nitrile rubber or polyurethane, to form single or multilayered gloves, where the outer layer has a majority of the antistatic agent and the inner layer has a majority of the elastomeric material, enhancing chemical compatibility and adherence between layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive carbon black is added to natural rubber latex to improve static resistivity, then antistatic properties are improved, but the article becomes black-colored and may cause contamination problems due to shedding of conductive particles
Solution Approach 1:
The patent changes the chemical composition parameters by replacing carbon black with a blend of natural rubber latex and synthetic rubber latex in specific proportions (60-90% natural rubber, 10-40% synthetic rubber). This compositional parameter change achieves antistatic properties through the synthetic rubber component while maintaining the aesthetic and contamination-free advantages of natural rubber.
Solution Approach 2:
The patent creates a composite latex material by blending natural rubber latex with synthetic rubber latex (such as nitrile, neoprene, or styrene-butadiene rubber). This composite approach combines the beneficial properties of both materials: the softness and tactile sensitivity of natural rubber with the antistatic properties of synthetic rubber, eliminating the need for carbon black additives.
2Adaptability or versatility
If multilayered gloves with different rubber layers are manufactured to achieve both antistatic and comfort properties, then functional requirements are met, but chemical incompatibility results in delamination between layers
Solution Approach 1:
The patent merges the previously separate latex layers into a single blended latex composition. By combining natural rubber latex and synthetic rubber latex into one homogeneous mixture before glove formation, the patent eliminates the interface between layers that caused delamination. The resulting single-layer glove maintains both antistatic and comfort properties without the adhesion problems of multilayer construction.
Solution Approach 2:
The patent creates a homogeneous latex blend by thoroughly mixing natural rubber latex with synthetic rubber latex before processing. This homogeneity ensures uniform distribution of both rubber types throughout the glove material, providing consistent antistatic properties and comfort characteristics while eliminating layer separation issues.
Data Source
AI summary
The present invention is directed to antistatic elastomeric articles and methods of making the same. The articles can be single layered or multilayered. The single layered articles possess desirable antistatic properties and desirable properties of comfort and feel. The multilayered articles have an outermost layer/surface that possesses desirable antistatic properties and an innermost layer/surface that exhibits desirable properties of comfort and feel. In preferred embodiments, the elastomeric articles are made form a nitrile/natural rubber blend. Articles of the present invention have antistatic properties measured as having a surface resistivity below about 1014 Ω/sq and a static decay time of less than about 60 seconds.