Polyester resin, method for producing polyester resin, resin composition, resin-clad fabric, and method for producing resin-clad fabric
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Solution Overview
Problem
Existing polyester resins used for fabric coatings lack flexibility, transparency, solvent resistance, and water resistance, making them unsuitable for outdoor applications such as tents and protective layers.
Innovation Solution
A polyester resin composition with specific molecular weight ranges of terephthalic acid, aliphatic dicarboxylic acid, dimer acid, ethylene glycol, and branched aliphatic glycol residues, which provides improved flexibility, transparency, solvent resistance, and water resistance when applied as a protective layer on fabrics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyurethane resin layer is formed to improve waterproof properties, then waterproof properties are improved, but flexibility deteriorates
Solution Approach 1:
The patent uses a composite resin system combining polyester resin with polyurethane resin or silane-modified polyurethane resin. The polyester resin provides flexibility while the polyurethane component delivers waterproof properties. This composite approach allows both requirements to be satisfied simultaneously without compromising either flexibility or waterproofing.
2Reliability
If acrylic resin or urethane resin is applied to improve heat resistance and solvent resistance, then heat resistance and solvent resistance are improved, but flexibility and transparency deteriorate
Solution Approach 1:
The patent modifies the chemical composition parameters of the resin system by incorporating specific polyester resins with controlled molecular weights and flexibility indices, combined with polyurethane or silane-modified polyurethane. This parameter optimization maintains heat and solvent resistance while preserving flexibility and transparency that pure acrylic or urethane coatings would lose.
3Reliability
If a resin layer is formed to improve waterproof properties, then waterproof properties are improved, but the resin-clad fabric becomes difficult to handle
Solution Approach 1:
The patent applies resin composition with specific local properties - using polyester resin as the base that inherently provides flexibility and handleability, while incorporating polyurethane or silane-modified polyurethane components specifically to enhance waterproof properties. This localized functional distribution ensures the fabric remains easy to handle while achieving superior waterproof performance.
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 resin composition enhances the fabric's performance by providing excellent flexibility, transparency, solvent resistance, and water resistance, making it suitable for outdoor products like tents and protective layers.
Implementation Method 1
solutions of an acrylic resin and a urethane resin are applied onto the fabric to form a layer of these resins on the fabric
Data Source
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AI summary
In order to provide a polyester resin having excellent flexibility, transparency, solvent resistance, heat resistance, and water resistance and capable of being used for a protective layer of a fabric, and a resin-clad fabric obtained by forming a layer of the polyester resin on a fabric, the present invention provides a polyester resin including: a dicarboxylic acid residue; and a glycol residue, in which the dicarboxylic acid residue includes a terephthalic acid residue (a), an aliphatic dicarboxylic acid residue (b) having 6 to 12 carbon atoms, and a dimer acid residue or hydrogenated dimer acid residue (c), the glycol residue includes an ethylene glycol residue or diethylene glycol residue (d) and a branched aliphatic glycol residue (e) having 3 to 9 carbon atoms, and the polyester resin includes 30 to 50 mol% of the residue (a), 3 to 9 mol% of the residue (b), 1 to 5 mol% of the residue (c), 30 to 60 mol% of the residue (d), and 0.1 to 10 mol% of the residue (e), with respect to 100 mol% of the total amount of the residue (a) to the residue (e).