ROMP Polymer In-Mold Coating via Mold Surface Priming
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Solution Overview
Problem
The existing methods for in-mold coating of ROMP polymer articles are inefficient, requiring complex geometries to achieve uniform coating and necessitating the use of ethylenic unsaturated monomers, organic-peroxide initiators, and volatile organic solvents, which are environmentally hazardous and costly.
Innovation Solution
The development of a composition and method for in-mold coating of ROMP polymers using a urethane-based primer or paint, which involves applying the paint to the mold surface, optionally applying a primer, and then contacting the painted mold surface with a resin composition containing cyclic olefins, olefin metathesis catalysts, and an in-mold coating adhesion compound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If primer and paint are applied to demolded ROMP polymer articles, then weathering properties are improved, but the process becomes difficult, expensive, and time-consuming
Solution Approach 1:
The patent applies primer and paint to the mold surface before injecting the ROMP composition, so that the coating is already in place before the polymer is formed. This preliminary action eliminates the need for post-demolding painting operations, reducing process complexity and cost while maintaining weathering protection.
Solution Approach 2:
The patent combines the coating application step with the molding process by applying primer and paint to the mold surface prior to injection. This merging of operations allows the coating to be applied once during mold preparation rather than requiring separate post-processing steps after demolding.
2Manufacturing precision
If primer and paint are applied in a paint booth or clean room, then surface quality is improved, but production cost and time increase
Solution Approach 1:
The primer and paint are applied to the mold surface in advance during mold preparation, allowing the coating to cure in a controlled environment before the ROMP composition is injected. This eliminates the need for post-demolding painting in controlled environments, maintaining surface quality while improving productivity.
Solution Approach 2:
The mold surface acts as an intermediary carrier for the primer and paint. By applying the coating to the mold rather than directly to the demolded article, the process allows for controlled application and curing while simplifying the overall manufacturing workflow and reducing the need for specialized post-processing facilities.
3Manufacturing precision
If complex geometries are used in in-mold coating, then uniform coating is achieved, but device complexity increases
Solution Approach 1:
The primer and paint are applied to the mold surface before injection, allowing the coating to conform to the mold's geometry. This preliminary application ensures uniform coating coverage is achieved through the mold design itself rather than requiring complex coating equipment or post-processing operations.
Solution Approach 2:
The patent replaces complex coating application mechanisms with a simpler approach where the coating is applied to the mold surface and then transferred to the polymer article during injection. This substitution of the coating delivery mechanism eliminates the need for complex coating equipment while maintaining uniform coating quality.
4Ease of manufacture
If ethylenic unsaturated monomers and organic-peroxide initiators are used, then polymerization occurs, but environmental harm increases
Solution Approach 1:
The patent changes the chemical parameters of the polymerization system by replacing ethylenic unsaturated monomers with cyclic olefin monomers and substituting organic-peroxide initiators with alternative initiation mechanisms. These parameter changes maintain polymerization functionality while eliminating environmentally harmful substances.
Solution Approach 2:
The patent eliminates the use of harmful organic-peroxide initiators and ethylenic unsaturated monomers that cause environmental damage and weathering problems. By replacing these substances with environmentally benign alternatives, the process converts a harmful chemical system into a sustainable one without sacrificing polymerization efficiency or coating quality.
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
This approach allows for the production of uniformly coated ROMP polymer articles with improved weathering properties, reduced environmental impact, and lower production costs, as it eliminates the need for organic-peroxide initiators and volatile organic solvents.
Implementation Method 1
a liquid cyclic olefin monomer resin is combined with an olefin metathesis catalyst to form a ROMP composition
Implementation Method 2
ROMP composition is subjected to conditions effective to polymerize the ROMP composition
Implementation Method 3
at least one in-mold coating adhesion compound
Data Source
AI summary
The present invention relates to in-mold coating of a cyclic olefin polymer. More particularly, the present invention relates to methods and compositions for in-mold coating cyclic olefin polymers prepared by ring opening metathesis polymerization (ROMP) reactions and the manufacture of polymer articles via ROMP. Polymer products produced via the metathesis reactions of the invention may be utilized for a wide range of materials and composite applications. The invention has utility in the fields of polymer and material chemistry and manufacture.