Carpet Coating Binder Composition to Prevent Roller Build-Up
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Solution Overview
Problem
Conventional all-surfactant stabilized vinyl ester/ethylene emulsion binders used in carpet manufacturing often lead to processing issues such as build-up on rollers and transfer problems during the carpet manufacturing process, despite providing excellent filler compounding and compatibility with other materials.
Innovation Solution
A carpet coating composition comprising an interpolymer formed by emulsion polymerization of vinyl ester monomers, ethylene, and an unsaturated, multi-functional cross-linking co-monomer, with a surfactant stabilizing system that is substantially free of protective colloids, which alters the interpolymer's molecular weight and flow properties to achieve low film elongation values, reducing the incidence of processing problems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If substantially all-surfactant stabilized vinyl ester/ethylene emulsion binders are used, then excellent filler compounding and compatibility with other materials are achieved, but processing problems occur such as build-up on rollers and transfer to carpet
Solution Approach 1:
The patent modifies the chemical composition parameters of the emulsion binder by incorporating specific comonomers (itaconic acid, maleic acid, fumaric acid) and controlling the surfactant-to-protective colloid ratio. This changes the molecular structure and surface properties of the polymer, reducing its tendency to build-up on rollers while maintaining compatibility with fillers and other carpet materials.
Solution Approach 2:
The invention creates a composite emulsion system combining vinyl ester/ethylene copolymer with small amounts of unsaturated polyacrylic acid or maleic anhydride, and using a specific combination of surfactants and protective colloids. This composite approach achieves both excellent filler compatibility and reduced processing problems by balancing the properties of different components.
2Strength
If conventional emulsion polymers are used as carpet coating compositions, then excellent adhesion to pile fibers is achieved, but the coating composition transfers to rollers and creates build-up during manufacturing
Solution Approach 1:
The patent changes the molecular weight distribution and functional group composition of the emulsion polymer by incorporating unsaturated polyacrylic acid or maleic anhydride as comonomers. This modifies the polymer's surface energy and adhesion characteristics, maintaining strong fiber bonding while reducing unwanted transfer to processing equipment.
Solution Approach 2:
The invention creates different functional zones within the coating composition: the polymer backbone provides adhesion to fibers, while the modified side chains and surfactant molecules control interfacial properties with rollers. This local differentiation of functions allows simultaneous achievement of strong adhesion and reduced transfer.
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 effectively secures carpet fibers and scrims while minimizing build-up on processing equipment, ensuring smooth processing and maintaining compatibility with other carpet components like SBR materials.
Implementation Method 1
The interpolymer in said coating composition is prepared by the emulsion polymerization of: (i) one or more vinyl ester monomers; (ii) ethylene; and (iii) an unsaturated, multi-functional cross-linking co-monomer
Implementation Method 2
a stabilizing system which comprises one or more anionic and/or nonionic surfactants and which is present in an amount which is effective to disperse the interpolymer in the water
Data Source
AI summary
Disclosed are carpet products made using certain types of coating compositions to secure carpet fibers to a carpet backing or substrates and/or to secure one or more carpet scrims or other layers to carpet backing. The coating compositions, which can be in the form of either precoating or skip coating compositions, are made from latex binder emulsions based on interpolymers emulsion polymerised from vinyl esters, ethylene, and a multifunctional cross-linking co-monomer such as an unsaturated silane. Such emulsions are also stabilised with surfactant emulsifiers but are substantially free of protective colloid stabilisers. The multifunctional co-monomer alters interpolymer molecular weight, branching and/or flow properties such that films formed from such interpolymers exhibit relatively low elongation values. When the emulsion binder exhibits such non-elongating film-forming characteristics, the carpet coating composition made from such binders can be easily processed without build-up on carpet processing apparatus. Such binder emulsions which are stabilised substantially only with surfactant emulsifiers, and not with protective colloids, also have excellent compatibility with other coating composition components.