Water-Oil Repellent Copolymer for Durable Soft-Touch Textiles
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Solution Overview
Problem
Existing water/oil repellent compositions for articles, such as fiber products, suffer from insufficient flexibility, texture deterioration, and instability when subjected to washing or foreign substances, particularly when vigorously stirred or exposed to dyes.
Innovation Solution
A water/oil repellent composition comprising a copolymer with specific monomer ratios, including 40-60% polymerized units from a monomer with a polyfluoroalkyl group, 25-59.9% from a (meth)acrylate with no polyfluoroalkyl group and a C12-18 alkyl chain, and 0.1-15% from monomers like 3,5-dimethylpyrazole adducts or triallyl cyanurate, which improves durability and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing water/oil repellent compositions are used to achieve water/oil repellency, then repellency is provided, but flexibility is insufficient and texture is likely to be deteriorated
Solution Approach 1:
The patent applies parameter changes by precisely controlling the composition ratios of three specific monomers in the copolymer: monomer (a) with polyfluoroalkyl group (40-60 mass%), monomer (b) with hydrocarbon group (25-59.9 mass%), and monomer (c) with specific functional groups (0.1-15 mass%). This optimized parameter combination achieves both excellent water/oil repellency and maintained flexibility/texture, resolving the contradiction between repellency performance and fabric hand-feel.
2Reliability
If existing water/oil repellent compositions are used to achieve water/oil repellency, then repellency is provided, but the emulsion is unstable when vigorously stirred or foreign substances are added
Solution Approach 1:
The patent employs composite materials by creating a copolymer that integrates three different monomer types with complementary functions: monomer (a) provides water/oil repellency through polyfluoroalkyl groups, monomer (b) contributes to emulsion stability and flexibility via hydrocarbon groups, and monomer (c) enhances mechanical stability and foreign substance resistance through specific functional groups. This composite polymer structure achieves both high repellency and excellent emulsion stability under various conditions.
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 composition imparts excellent water/oil repellency to articles without deteriorating their texture, enhances durability against washing, and maintains stability in the presence of foreign substances, ensuring long-lasting performance.
Implementation Method 1
a copolymer having from 40 to 60 mass% of polymerized units derived from the following monomer (a), from 25 to 59.9 mass% of polymerized units derived from the following monomer (b), and from 0.1 to 15 mass% of polymerized units derived from the following monomer (c): monomer (a): a compound of the following formula (1): (Z-Y) n X (1) wherein Z is a C1-6 RF[0009]
Implementation Method 2
a water/oil repellent composition which can impart water/oil repellency to a surface of an article
Implementation Method 3
a monomer mixture comprising from 40 to 60 mass% of the monomer (a), from 25 to 59.9 mass% of the monomer (b) and from 0.1 to 15 mass% of the monomer (c) is polymerized in a medium in the presence of a surfactant and a polymerization initiator
Data Source
AI summary
To provide a water/oil repellent composition which can impart water/oil repellency to a surface of an article without having its texture deteriorated, and has excellent durability against washing and stability, a method for producing such a composition, and an article treated with such a water/oil repellent composition. A water/oil repellent composition which comprises a copolymer having polymerized units derived from monomer (a), polymerized units derived from monomer (b) and polymerized units derived from monomer (c). Here, monomer (a) is a compound represented by the formula: (Z-Y)nX; wherein Z is a C1-6 perfluoroalkyl group or the like; Y is a bivalent organic group or a single bond; n is 1 or 2; and X is a polymerizable unsaturated group; monomer (b) is a (meth)acrylate having no Rf group and having a C12-18 alkyl group; and monomer (c) is monomer (c1) having no Rf group and having a blocked isocyanate group or monomer (c2) having no Rf group and having at least two polymerizable unsaturated groups.