Polyurethane-based UV-curable composition, adhesive film comprising the same, adhesive tape and bonded member
Assignee3M Innovative Properties Company
InventorsLijing Zhang, Fan Gao, Guoliang Zhang
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Abstract
The present invention relates to a novel polyurethane-based UV-curable composition, comprising a low-crystallinity polyurethane polymer, a multifunctional thiol compound, a multifunctional epoxy resin compound, a photobase generator, and an optional photosensitizer. Adhesive films, adhesive tapes, and bonded members with excellent initial bonding performance, die cutting performance, overlap strength and drop-resistance performance may be obtained by using the polyurethane-based UV-curable composition provided by the present invention.
Claims16
A polyurethane-based UV-curable composition, the polyurethane-based UV-curable composition comprising:
- (a) a low-crystallinity polyurethane polymer, a crystal melting enthalpy of the low-crystallinity polyurethane polymer tested by adopting a DSC testing method being smaller than 1 J/g, the low-crystallinity polyurethane polymer comprising a reaction product of an isocyanate component and a polyol component;
- (b) a multifunctional thiol compound, based on every 100 g of the low-crystallinity polyurethane polymer, the multifunctional thiol compound containing 0.01-0.25 mol of a sulfhydryl group;
- (c) a multifunctional epoxy resin compound, based on every 100 g of the low-crystallinity polyurethane polymer, the multifunctional epoxy resin compound containing 0.01-0.25 mol of an epoxy group;
- and
- (d) a photobase generator, based on every 100 g of the low-crystallinity polyurethane polymer, the amount of the photobase generator being 0.3-15.0 g.
Dependencies are inferred from the claim text.