Stretchable Resin Sheet Composition That Resists Sagging and Tightness
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Solution Overview
Problem
Conventional elastic sheets made from polyurethane resins suffer from sagging and excessive tightness, leading to discomfort and reduced usability over time.
Innovation Solution
An elastic sheet composed of a specific resin composition containing a block copolymer with vinyl aromatic and conjugated diene compounds, hydrocarbon softener, and styrene-containing oligomer, with a thickness of not more than 200 µm, and specific tension and flow initiation temperature, ensuring reduced tightness and improved elasticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polyurethane resin is used to form elastic sheet, then elasticity and flexibility are achieved, but the sheet suffers from sagging after repeated use and causes excessive tightness
Solution Approach 1:
The patent changes the chemical composition parameters of the elastic sheet by using a specific block copolymer system (polyester-polyethylene terephthalate block copolymer with specific glass transition temperature ranges) instead of conventional polyurethane resin. This parameter change in material composition achieves both reduced tightness and maintained elasticity durability without sagging.
Solution Approach 2:
The patent employs a composite material system consisting of multiple block copolymer components with specific properties. The composite structure includes polyester block copolymer as the base, combined with specific amounts of polyethylene terephthalate block copolymer and other functional additives, creating a material that simultaneously provides comfort (reduced tightness) and reliability (resistance to sagging).
2Ease of operation
If conventional elastic sheet is used repeatedly, then initial elasticity is maintained, but the elastic portion becomes unrecoverable and sagging occurs
Solution Approach 1:
The patent modifies the thermal and compositional parameters of the elastic sheet by selecting block copolymers with specific glass transition temperatures ( -50°C to -100°C for the polyester block copolymer and -20°C to -40°C for the polyethylene terephthalate block copolymer). These parameter changes enable the material to maintain its elastic recovery capability over repeated use cycles without sagging.
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 elastic sheet maintains its shape and elasticity without sagging after repeated use, providing comfort and reduced tightness, suitable for applications like clothing.
Implementation Method 1
an elastic sheet formed with a resin composition comprising: a copolymer (a) that is a block copolymer comprising: a polymer block A mainly comprising a vinyl aromatic compound; and a polymer block B mainly comprising a conjugated diene compound
Implementation Method 2
with respect to 100 parts by mass of the copolymer (a), 50 to 200 parts by mass of a hydrocarbon softener (b)... the flow initiation temperature of the resin composition is not more than 200°C
Implementation Method 3
5 to 20 parts by mass of a styrene-containing oligomer (c)... capable of thermal fusion bonding at a temperature of not more than 170°C
Data Source
AI summary
The present invention relates to an elastic sheet formed with a resin composition comprising: a copolymer (a) that is a block copolymer comprising: a polymer block A mainly comprising a vinyl aromatic compound; and a polymer block B mainly comprising a conjugated diene compound; or that is a hydrogenated product of the block copolymer; and with respect to 100 parts by mass of the copolymer (a), 50 to 200 parts by mass of a hydrocarbon softener (b); and 5 to 20 parts by mass of a styrene-containing oligomer (c), the elastic sheet having a thickness of not more than 200 µm.