Spheroidal Polyolefin Extender for Stain Removal
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Solution Overview
Problem
Inorganic extenders in architectural coatings, such as calcium carbonate and silica, compromise stain removal properties and require significant formulation adjustments to balance cost and performance, making it difficult to achieve effective stain removal without damaging the paint.
Innovation Solution
An aqueous dispersion of spheroidal polyolefin particles with a specific composition, including 53-85% polyolefin, 5-40% maleic anhydride functionalized polyolefin, and optionally 9-35% ethylene-acrylic acid copolymer, serves as an organic extender in below-critical PVC coatings, enhancing stain removal properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If inorganic extenders such as calcium carbonate and silica are used to reduce cost and reduce sheen, then cost-performance balance is improved, but stain removal properties deteriorate and formulation complexity increases
Solution Approach 1:
The invention changes the fundamental parameter of extender material from inorganic to organic (polyolefin-based), while also changing particle morphology parameters (spheroidal shape, 10-30 μm size) to achieve both cost-effectiveness and improved stain removal properties
Solution Approach 2:
The invention creates a composite organic extender material combining polyolefin base resin with specific additives (5-15% matting agent, 0.1-5% coupling agent, 0.1-5% surfactant) to achieve multiple functions: cost reduction, sheen control, and improved stain removal, eliminating the need for traditional inorganic extenders
2Illumination intensity
If inorganic extenders are used to reduce coating sheen, then gloss reduction is achieved, but coating durability and resistance performances deteriorate
Solution Approach 1:
The invention changes the extender material parameter from inorganic to organic polyolefin, and controls particle size (10-30 μm) and shape (spheroidal) to achieve gloss reduction while maintaining or improving coating durability and resistance properties
Solution Approach 2:
The invention applies specific functional additives locally within the organic extender structure: matting agents (5-15%) for gloss control, coupling agents (0.1-5%) for durability enhancement, and surfactants (0.1-5%) for performance optimization, allowing simultaneous achievement of multiple properties
3Ease of manufacture
If inorganic extenders are used to reduce coating cost, then formulation cost is reduced, but formulation adjustment complexity increases
Solution Approach 1:
The invention changes the extender type to organic polyolefin with defined composition parameters (53-85% polyolefin, 5-40% coupling agent, 9-35% ethylene-acrylic acid copolymer), which simplifies formulation development while maintaining cost-effectiveness
Solution Approach 2:
The invention uses a pre-formulated composite organic extender containing polyolefin base resin, matting agents, coupling agents, and surfactants in specific ratios, which reduces formulation adjustment complexity compared to traditional inorganic extender systems while achieving cost reduction
Data Source
AI summary
The present invention relates to a composition comprising an aqueous dispersion of spheroidal particles having a mode particle size of from 10 to 30 µm. The spheroidal particles are useful as organic extenders, especially in below-critical pigmented coatings formulations, and provide coatings with improved stain removal properties.