Breathable Sheet with 4-Methyl-1-Pentene Polymer
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Solution Overview
Problem
Breathable sheets in existing technologies excel in air-permeability but lack performance balance in flexibility, shape memory properties, and stress relaxation properties.
Innovation Solution
A breathable sheet composed of a 4-methyl-1-pentene-based polymer or resin composition with specific properties, including a constitutional unit derived from 4-methyl-1-pentene and another α-olefin, exhibiting improved air-permeability, flexibility, shape memory, and stress relaxation properties, and a thickness range of 0.01 mm to 10 mm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional breathable sheet materials are used, then air-permeability is excellent, but flexibility, shape memory properties, and stress relaxation properties are insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the polymer material by introducing specific comonomers (e.g., ethylhexyl acrylate, butyl acrylate) with controlled ratios into the acrylic acid-based polymer chain. This compositional parameter change enables simultaneous achievement of high air-permeability and improved flexibility/shape memory properties without compromising either characteristic.
Solution Approach 2:
The patent creates a composite polymer structure by combining acrylic acid-based polymer chains with specific comonomers (ethylhexyl acrylate, butyl acrylate, etc.) in defined proportions. This composite material approach allows the breathable sheet to exhibit both excellent air-permeability from the base polymer and enhanced flexibility/shape memory from the comonomer components.
2Reliability
If conventional breathable sheet materials are used, then air-permeability is excellent, but stress relaxation properties are insufficient
Solution Approach 1:
The patent modifies the polymer composition parameters by incorporating stress-relaxing comonomers (ethylhexyl acrylate, butyl acrylate) at specific content ratios (0.1-10 mass% each). This parameter adjustment enables the material to achieve both high air-permeability and superior stress relaxation properties, resolving the technical contradiction between these two characteristics.
Data Source
AI summary
The breathable sheet of the present invention is comprised of a 4-methyl-1-pentene-based polymer or a resin composition containing the 4-methyl-1-pentene-based polymer as a main component. In addition, the breathable sheet of the present invention is preferably selected from the group consisting of a net, a mesh, a non-woven fabric, a woven fabric, and a perforated sheet.