Multilayer Polymer Particles for Latex Paint Durability
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Solution Overview
Problem
Latex paints exhibit inferior coating properties and storage stability compared to solvent-based paints, particularly in terms of durability, adhesion, blocking resistance, water resistance, chemical resistance, gloss, and scrub resistance.
Innovation Solution
Multistage polymers comprising a first stage with a high molecular weight copolymer derived from soft ethylenically-unsaturated monomers and phosphorus-containing monomers, and a second stage with a lower molecular weight polymer derived from ethylenically-unsaturated monomers and ethylenically unsaturated acid monomers, formed into multilayer particles through emulsion polymerization and high temperature polymerization processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If latex paints are used instead of solvent-based paints, then volatile organic solvent levels are reduced and cleanup is easier, but coating properties and storage stability deteriorate
Solution Approach 1:
The patent divides the polymer particle into multiple distinct layers (first layer, second layer, and optional third layer), each with different compositions and functions. The first layer provides film formation and adhesion, the second layer provides durability and resistance properties, and the third layer (if present) provides additional functional properties. This segmentation allows each layer to optimize for its specific function without compromise.
Solution Approach 2:
The patent uses composite polymer structures combining different polymer types in a multilayer configuration. Each layer is formed from specific copolymers with tailored compositions (different monomer ratios, molecular weights, and glass transition temperatures) to achieve synergistic performance that neither single-layer structure could provide alone.
2Object-generated harmful factors
If conventional latex polymers are used, then the coating is environmentally friendly with low solvent content, but durability and adhesion are inferior
Solution Approach 1:
Different regions (layers) of the particle have different compositions optimized for their specific functions. The first layer uses polymers with lower Tg for flexibility and adhesion, while the second layer uses polymers with higher Tg for durability and resistance. This local optimization of material properties throughout the particle structure enables superior overall performance.
Solution Approach 2:
The patent transitions from conventional single-layer or homogeneous polymer structures to a three-dimensional multilayer particle architecture. This dimensional complexity allows simultaneous optimization of multiple properties (adhesion, durability, resistance) that cannot be achieved in a single homogeneous phase.
3Reliability
If multilayer particles with multiple polymer stages are synthesized, then coating performance properties improve, but manufacturing process complexity increases
Solution Approach 1:
The patent prepares polymer dispersions for each layer in advance through separate polymerization processes, allowing optimization of each layer's composition and properties independently. These pre-prepared dispersions are then combined in controlled ratios to form the final multilayer particle, separating the complex synthesis steps from the final formulation step.
Solution Approach 2:
The patent uses polymer dispersions as intermediary materials that facilitate the creation of multilayer particles. Each layer is first synthesized as a separate dispersion with controlled properties, then these dispersions serve as building blocks that are combined to form the final complex particle structure, simplifying the overall manufacturing approach.
Data Source
AI summary
The present disclosure provides multilayer particles comprising (i) a first layer comprising a first copolymer with an Mn of greater than 50,000 g/mol derived from one or more soft ethylenically-unsaturated monomers, and one or more phosphorus-containing monomer; and (ii) a second layer surrounding at least a portion of the first layer comprising a second polymer having an Mn of 500 g/mol to 50,000 g/mol, derived from one or more ethylenically-unsaturated monomer, and at least one ethylenically unsaturated acid monomer, wherein the second layer is prepared by a high temperature polymerization process. The present disclosure further provides methods of making the multilayer particles.