Vinyl Functionalized Urethane Resin Handling
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Solution Overview
Problem
Current thermosetting powder coating compositions face challenges with crystalline vinyl ether functionalized urethane resins, which are highly reactive but difficult to handle due to stickiness and long recrystallization times, limiting their use in thermosetting powder coatings, especially on heat-sensitive substrates, and requiring significant process modifications.
Innovation Solution
Development of a crystalline vinyl functionalized urethane resin with a specific ratio of urethane to vinyl groups, measured via 1H-NMR spectroscopy, that is solid at room temperature and has enhanced processability, allowing for easier manufacturing and storage stability, while maintaining good flexibility and resistance to acetone and coffee stains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If crystalline vinyl ether functionalized urethane resins are used as curing agents, then reactivity and curing performance are improved, but handling difficulty and stickiness increase
Solution Approach 1:
The patent modifies the chemical structure of vinyl ether functionalized urethane resins by controlling the ratio of vinyl ether groups to hydroxyl groups (specifically 1.05-1.30), and by adjusting molecular weight and crystallinity parameters. These parameter changes reduce stickiness and improve handling while preserving the high reactivity needed for effective curing of powder coating compositions.
2Reliability
If crystalline vinyl ether functionalized urethane resins are used, then curing reactivity is enhanced, but recrystallization time increases
Solution Approach 1:
The patent optimizes the crystallinity and molecular weight parameters of the urethane resin to achieve a balance where the material maintains high curing reactivity through its vinyl ether functionality while reducing recrystallization time to under 5 minutes at room temperature, enabling faster processing cycles.
3Reliability
If high reactivity resin is used for powder coatings, then coating performance is improved, but process modifications are required
Solution Approach 1:
The resin is formulated to be self-regulating in its reactivity, allowing it to cure effectively at standard powder coating temperatures (140-180°C) without requiring specialized equipment or modified processing procedures. The controlled crystallinity and molecular weight enable the resin to maintain stability during storage and application while delivering high performance in the final coating.
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 new resin composition enables thermosetting powder coatings with improved handling and storage stability, flexibility, and resistance to common stains, suitable for use on heat-sensitive substrates without compromising scratch resistance, and can be cured at relatively low temperatures.
Implementation Method 1
Vinyl ether terminated urethane resins are extremely reactive and are known to undergo rapid polymerization when exposed to radiation
Implementation Method 2
these compounds are particularly useful as curing agents in applications which require high speed curing of a coating formulation such as radiation curable coating compositions
Data Source
AI summary
The invention relates to a vinyl functionalized urethane resin (VFUR) useful as a curing agent in thermosetting powder coating compositions, a process for making said vinyl functionalized urethane resin, a vinyl functionalized urethane resin composition (VFURC) useful as a curing agent in thermosetting powder coating compositions, a process for making vinyl functionalized urethane resin composition, a thermosetting powder coating composition (TPCC), a process for the preparation thereof, a cured thermosetting powder coating composition, processes for coating an article with said thermosetting powder coating composition and an article coated with said thermosetting powder coating composition as well as uses of the vinyl functionalized urethane resin or of the vinyl functionalized urethane resin composition or of the thermosetting powder coating composition or of the articles having coated and cured thereon said thermosetting powder coating composition. The invention relates also to thermosetting powder coating composition useful for powder-in-mold coating articles such as reinforced polymeric e.g. polyester resin articles and to powder-in-mold coating methods employing the thermosetting powder coating composition and use of the in-mold coated article.