Core-Shell Latex Composition for Low-Temperature Textile Crosslinking
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Solution Overview
Problem
Existing latex polymers used for treating textiles often release formaldehyde during crosslinking and require high temperatures, which are undesirable, while also lacking stability and sufficient tensile strength.
Innovation Solution
An aqueous composition of latex polymer particles with a core polymer comprising 95% monofunctional vinyl monomers and 0-5% multivinyl monomers, and a shell polymer containing 35-95% monofunctional vinyl monomers and 5-65% vinyl monomers with trialkoxysilyl groups, allowing for low-temperature crosslinking without formaldehyde release and providing stability and high tensile strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional latent crosslinking monomers (amide or N-alkylolamide) are used in the shell polymer, then crosslinking capability is achieved, but formaldehyde is released during the crosslinking process
Solution Approach 1:
The patent changes the chemical composition parameters of the shell polymer by incorporating vinyl monomers with trialkoxysilyl groups (5-65% by weight) instead of conventional amide or N-alkylolamide latent crosslinking monomers. This parameter change enables crosslinking through silane chemistry rather than formaldehyde-based chemistry, eliminating formaldehyde release while maintaining crosslinking capability.
Solution Approach 2:
The patent creates a composite polymer structure combining core polymer (providing stability and low Tg) with shell polymer containing trialkoxysilyl groups (enabling crosslinking). This composite approach allows the shell to provide crosslinking functionality through silane-based mechanisms that do not release formaldehyde, while the core maintains storage stability.
2Reliability
If high cure temperatures are used to achieve effective crosslinking, then crosslinking efficiency is improved, but storage stability deteriorates and energy consumption increases
Solution Approach 1:
The patent changes the crosslinking temperature parameter from conventional high temperatures (requiring 100-150°C or higher) to lower temperatures (effective crosslinking at 50-100°C). This is achieved by using trialkoxysilyl groups that can undergo hydrolysis and condensation at lower temperatures, improving storage stability while maintaining crosslinking efficiency.
Solution Approach 2:
The patent applies different functional properties to different parts of the polymer particle: the core polymer provides low Tg (50°C or lower) for flexibility and stability, while the shell polymer with trialkoxysilyl groups (5-65% by weight) provides localized crosslinking capability at lower temperatures. This local differentiation allows low-temperature crosslinking without compromising storage stability.
3Reliability
If the shell polymer contains high content of functional monomers (other than alkyl (meth)acrylates, styrene, and vinyl monomers having trialkoxysilyl groups), then crosslinking reactivity is improved, but latex stability during storage deteriorates
Solution Approach 1:
The patent changes the compositional parameters of the shell polymer by strictly limiting the total content of all monomers other than alkyl (meth)acrylates, styrene, and vinyl monomers having trialkoxysilyl groups to 0-3% by weight. This parameter control ensures latex stability during storage while maintaining adequate crosslinking reactivity through the trialkoxysilyl groups (5-65% by weight).
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 achieves stable storage, low-temperature crosslinking, and high tensile strength in textiles, comparable to or exceeding commercial binders, with reduced dependence on cure temperature for effective crosslinking.
Implementation Method 1
a shell polymer that comprises (i) 35% to 95% by weight, based on the dry weight of the shell polymer, polymerized units of one or more monofunctional vinyl monomers, and (ii) 5% to 65% by weight, based on the dry weight of the shell polymer, polymerized units of one or more vinyl monomers having trialkoxysilyl groups
Data Source
AI summary
Provided is an aqueous composition comprising latex polymer particles that comprise (a) 40% to 95%, by weight based on the dry weight of the latex polymer, a core polymer that comprises (i) polymerized units of one or more monofunctional vinyl monomers, and (ii) polymerized units of one or more multivinyl monomers, and (b) 5% to 60%, by weight based on the dry weight of the latex polymer, a shell polymer that comprises (i) polymerized units of one or more monofunctional vinyl monomers, and (ii) polymerized units of one or more vinyl monomers having a latent crosslinking group selected from the group consisting of trialkoxysilyl groups, oxoacetyl groups, and mixtures thereof.