Actinic radiation and moisture dual curable composition

摘要

A dual curable, liquid adhesive composition capable of polymerization by exposure to actinic radiation and moisture. The composition is particularly useful for liquid adhesives for electronic applications. The composition comprises an alkoxysilane functional polyurethane acrylate oligomer; a free radical polymerizable reactive diluent; a free radical photoinitiator; a catalyst for moisture curing of silane groups; and an optional alkoxysilane functional oligomer having a polyolefin group; an optional acrylate or methacrylate functional polyurethane acrylate oligomer; an optional hydroxyl terminated monoacrylate or monomethacrylate functional reactive diluent; an optional UV-absorber and hindered amine light stabilizer antioxidant; an optional wax capable of reducing oxygen inhibition; an optional 1,3 dicarbonyl compound chelating agent; an optional thixotropic agent; and an optional adhesion promoter. optional adhesion promoter.

主权项

1. An actinic radiation and moisture dual curable composition which comprises:
(a) from about 10 to about 90 percent by weight of at least one alkoxysilane functional polyurethane acrylate oligomer having the formula (1) or (2):
A-D-(P-D)n-X  (1)A-D-(P-D)n-P—Y  (2) wherein: i) D is a di- or tri-functional isocyanate group; ii) P is a polyol group having a molecular weight of from about 50 Daltons to about 10000 Daltons; iii) n is from 1 to about 100; iv) A is a monoalcohol functional acrylate or methacrylate group; v) X is a methoxysilane or ethoxysilane functional group containing a urea or thiourethane linkage; vi) Y is a methoxysilane or ethoxysilane functional group containing a urethane linkage; (b) from 0 to about 40 percent by weight of at least one alkoxysilane functional oligomer having the formula (3) or (4):
Y—(PO-D)m-PO—Y  (3)X-D-(PO-D)m-X  (4) wherein: i) D is a di- or tri-functional isocyanate group; ii) PO is a polyolefin group having a molecular weight of from about 300 Daltons to about 10000 Daltons; iii) m is from 1 to about 100; iv) X is a methoxysilane or ethoxysilane functional group containing a urea or thiourethane linkage; v) Y is a methoxysilane or ethoxysilane functional group containing a urethane linkage; (c) from 0 to about 40 percent by weight of at least one acrylate or methacrylate functional polyurethane acrylate oligomer having the formula (5);
A-D-(P-D)k-A  (5) wherein; i) D is a di- or tri-functional isocyanate group; ii) P is a polyol group having a molecular weight of from about 50 Daltons to about 10000 Daltons; iii) k is from 1 to about 100; iv) A is a monoalcohol functional acrylate or methacrylate group; (d) from 0 to about 20 percent by weight of at least one hydroxyl terminated monoacrylate or monomethacrylate functional reactive diluent; (e) from 1 to about 60 percent by weight of at least one free radical polymerizable reactive diluent; (f) from about 0.1 to about 10 percent by weight of at least one free radical photoinitiator; (g) from about 0.01 to about 3 percent by weight of at least one catalyst for moisture curing of silane groups; (h) from 0 to about 3 percent by weight of a UV-absorber and hindered amine light stabilizer antioxidant; (i) from 0 to about 15 percent by weight of a wax capable of reducing oxygen inhibition; (j) from 0 to about 3 percent by weight of 1,3 dicarbonyl compound chelating agent; (k) from 0 to about 10 percent by weight of a thixotropic agent; (l) from 0 to about 10 percent by weight of an adhesion promoter.