US 12,473,467 B2
Polyurethane-based UV-curable composition, adhesive film comprising the same, adhesive tape and bonded member
Lijing Zhang, Shanghai (CN); Fan Gao, Shanghai (CN); and Guoliang Zhang, Shanghai (CN)
Assigned to 3M Innovative Properties Company, St. Paul, MN (US)
Appl. No. 17/757,639
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Jan. 4, 2021, PCT No. PCT/IB2021/050024
§ 371(c)(1), (2) Date Jun. 17, 2022,
PCT Pub. No. WO2021/140432, PCT Pub. Date Jul. 15, 2021.
Claims priority of application No. 202010016476.X (CN), filed on Jan. 7, 2020.
Prior Publication US 2023/0034083 A1, Feb. 2, 2023
Int. Cl. C09J 7/40 (2018.01); C08L 75/08 (2006.01); C09J 7/10 (2018.01); C09J 7/38 (2018.01); C09J 11/08 (2006.01); C09J 175/08 (2006.01)
CPC C09J 7/403 (2018.01) [C08L 75/08 (2013.01); C09J 7/10 (2018.01); C09J 7/38 (2018.01); C09J 11/08 (2013.01); C09J 175/08 (2013.01); C09J 2467/005 (2013.01)] 16 Claims
 
1. 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.