Silicone Polyester Coating for Soft Touch and Anti-Fingerprinting
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Solution Overview
Problem
Coatings for consumer electronic devices often face a trade-off between soft touch properties and anti-fingerprinting performance, with improvements in anti-fingerprinting leading to a deterioration of soft touch properties.
Innovation Solution
A silicone-containing polyester polyol is developed, comprising a reaction product of a diol, a polyol with three or more hydroxyl groups, a dimer of a fatty acid, or its anhydride/ester, and a silicone component with siloxane linkages and reactive functional groups, combined with a crosslinker to form a coating composition that balances soft touch and anti-fingerprinting properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If soft touch coatings are applied to consumer electronic devices, then the soft touch properties are improved, but the anti-fingerprinting properties deteriorate
Solution Approach 1:
The invention uses a composite material system combining polyester polyol, silicone component, and crosslinking agent to create a coating that simultaneously achieves soft touch and anti-fingerprinting properties. The polyester polyol provides softness and flexibility, while the silicone component contributes to fingerprint resistance, and the crosslinking agent enhances durability and cleaning performance.
Solution Approach 2:
The invention optimizes specific parameters including the hydroxyl value of polyester polyol (30-200 mg KOH/g), molecular weight (500-10,000 g/mol), and the ratio of polyester polyol to silicone component (95:5 to 50:50 by weight) to balance soft touch and anti-fingerprinting properties. The crosslinking density and curing conditions are also controlled to achieve the desired performance balance.
2Object-affected harmful factors
If anti-fingerprinting properties are improved in soft touch coatings, then fingerprint resistance is enhanced, but the soft touch properties deteriorate
Solution Approach 1:
The invention precisely controls the hydroxyl value of polyester polyol within 30-200 mg KOH/g and molecular weight between 500-10,000 g/mol to maintain softness. The weight ratio of polyester polyol to silicone component is optimized between 95:5 and 50:50, allowing adjustment between soft touch and anti-fingerprinting performance based on application requirements.
Solution Approach 2:
The coating formulation combines polyester polyol (for softness), silicone component (for fingerprint resistance), and crosslinking agent (for durability) in specific proportions. This composite approach allows the coating to exhibit both soft touch characteristics and enhanced anti-fingerprinting performance without compromising either property.
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 coating composition achieves a balance between soft touch and anti-fingerprinting performance, providing effective anti-fingerprinting while maintaining a soft, smooth feel, as demonstrated by reduced fingerprint visibility and ease of removal, along with improved surface roughness and friction coefficients.
Implementation Method 1
a silicone component comprising siloxane linkages and at least two reactive functional groups selected from hydroxyl groups, phenolic groups, amino groups, thiol groups, carboxylic acid groups, anhydride groups
Implementation Method 2
coating composition comprising the silicone-containing polyester polyol and a crosslinker reactive with the silicone-containing polyester polyol
Data Source
AI summary
A silicone-containing polyester polyol can include a reaction product prepared from reactants including: a diol; a polyol having at least three hydroxyl groups; a dimer of a fatty acid having two carboxylic acid groups, or an anhydride or ester thereof; and a silicone component having siloxane linkages and at least two reactive functional groups selected from hydroxyl groups, amino groups, thiol groups, carboxylic acid groups, anhydride groups, or combinations thereof. A coating composition for preparing an anti-fingerprinting, soft touch coating can include the silicone-containing polyester polyol and a crosslinker reactive with the silicone-containing polyester polyol.