Curable composition

摘要

The present invention aims to provide a curable composition that, while having practical curability, gives a cured product with excellent recovery, and exhibits excellent curability as well as excellent water-resistant adhesion. The curable composition includes 100 parts by weight of a reactive silyl group-containing organic polymer (A); 0.1 to 10 parts by weight of a dialkyltin disilicate compound (B); and an amino silane coupling agent (C), the dialkyltin disilicate compound (B) being a tin compound containing a bulky alkyl group and a silicate moiety with a C1 or C2 alkoxy group, and the amino silane coupling agent (C) including 1 to 10 parts by weight of an amino silane coupling agent (C1) containing a trialkoxysilyl group, and less than 1 part by weight of an amino silane coupling agent (C2) containing a dialkoxysilyl or monoalkoxysilyl group.

主权项

1. A curable composition comprising:
100 parts by weight of an organic polymer (A) containing at least one silyl group that contains a hydroxy or hydrolyzable group bonded to a silicon atom and can form a siloxane bond to be cross-linked; 0.1 to 10 parts by weight of a silanol condensation catalyst (B); and a silane coupling agent (C) that contains a primary amino group, the silyl group in the organic polymer (A) being a group represented by formula (5):
—SiR63−a(OR7)a  (5) wherein R6 is each independently a C1 to C20 alkyl group, a C6 to C20 aryl group, a C7 to C20 aralkyl group, or a triorganosiloxy group represented by (R′)3SiO— with R′ each independently being a substituted or unsubstituted C1 to C20 hydrocarbon group; R7 is each independently a C1 hydrocarbon group; and a is 2, the silanol condensation catalyst (B) being a reaction product of a dialkyltin dicarboxylate represented by the following formula (1) and a tetraalkoxysilane represented by the following formula (2) and/or its partially hydrolyzed condensate, the formula (1) being
R12Sn(OCOR2)2  (1) wherein R1 is each independently a C5 to C17 monovalent hydrocarbon group, and R2 is each independently a C1 to C17 monovalent hydrocarbon group, the formula (2) being
Si(OR3)4  (2) wherein R3 is each independently a C1 or C2 hydrocarbon group, the silane coupling agent (C) that contains a primary amino group being an amino silane coupling agent that contains an —NH2 group and a group represented by formula (3):
—SiR43−b(OR5)b   (3) wherein R4 is each independently a C1 to C20 hydrocarbon group, R5 is each independently a C1 hydrocarbon group, and b is 1, 2, or 3, wherein R7 in the component (A) and R5 in the component (C) are the same groups, and the curable composition having a content of an amino silane coupling agent (C1) with b in formula (3) being 3 of 1 to 10 parts by weight, and having a content of an amino silane coupling agent (C2) with b in formula (3) being 1 or 2 of less than 1 part by weight.