CURABLE COMPOSITION
The present invention has its object to provide a curable composition which comprises a guanidine compound as a non-organotin type catalyst, is less discolored, has good surface curability, depth curability, strength rise and adhesiveness, and can retain the curability even after storage; the above object can be achieved by a curable composition which comprises: (A) an organic polymer containing a silyl group capable of crosslinking under siloxane bond formation, the silyl group being a group represented by the general formula (1): —SiX 3 (1) (wherein X represents a hydroxyl group or a hydrolyzable group and the three X groups may be mutually the same or different), (B) a guanidine compound (B-1) as a silanol condensation catalyst, and (C) a plasticizer, wherein the content of the component (B-1) is not lower than 0.1 part by weight but lower than 8 parts by weight per 100 parts by weight of the component (A), and a non-phthalate ester plasticizer accounts for 80 to 100% by weight of the (C) component plasticizer.
1 . A non-organotin curable composition which comprises:
(A) an organic polymer containing a silyl group capable of crosslinking under siloxane bond formation, said silyl group being a group represented by the general formula (1):
—SiX 3 (1)
(wherein X represents a hydroxyl group or a hydrolyzable group and the three X groups may be mutually the same or different),
(B) a guanidine compound (B-1) as a silanol condensation catalyst, and
(C) a plasticizer,
wherein the content of the component (B-1) is not lower than 0.1 part by weight but lower than 8 parts by weight per 100 parts by weight of the component (A), and a non-phthalate ester plasticizer accounts for 80 to 100% by weight of the (C) component plasticizer.
2 . The curable composition according to claim 1 ,
wherein the component (B-1) is a guanidine compound represented by the general formula (2):
R 1 N═C(NR 2 2 )—NR 3 2 (2)
(wherein R 1 , the two R 2 s and the two R 3 s are independently an organic group or a hydrogen atom, provided that four or more of R 1 , the two R 2 s and the two R 3 s are independently an organic group other than an aryl group, or a hydrogen atom.
3 . The curable composition according to claim 2 ,
wherein the component (B-1) represented by the general formula (2) is a biguanide compound represented by the general formula (3):
R 4 N═C(NR 5 2 )—NR 6 —C(═NR 7 )—NR 8 2 (3)
(wherein R 4 , the two R 5 s, R 6 , R 7 and the two R 8 s are independently an organic group or a hydrogen atom, and/or the general formula (4):
R 9 N═C(NR 10 2 )—N═C(NR 11 2 )—NR 12 2 (4)
(wherein R 9 , the two R 10 s, the two R 11 s and the two R 12 s are independently an organic group or a hydrogen atom).
4 . The curable composition according to claim 1 ,
wherein the component (B-1) is a guanidine compound having a melting point of not lower than 23° C.
5 . The curable composition according to claim 1 ,
wherein a main chain skeleton of the (A) component organic polymer contains at least one atom selected from among a hydrogen atom, a carbon atom, a nitrogen atom, an oxygen atom and a sulfur atom.
6 . The curable composition according to claim 1 ,
wherein the (A) component organic polymer comprises at least one species selected from the group consisting of polyoxyalkylene polymers, saturated hydrocarbon polymers and (meth)acrylate ester polymers.
7 . The curable composition according to claim 6 ,
wherein the polyoxyalkylene polymer is a polyoxypropylene polymer.
8 . The curable composition according to claim 1 ,
wherein a main chain skeleton of the (A) component organic polymer contains a group represented by the general formula (5):
—NR 13 —C(═O)— (5)
(wherein R 13 is an organic group or a hydrogen atom).
9 . The curable composition according to claim 1 ,
which contains the (C) component plasticizer in an amount of 5 to 150 parts by weight per 100 parts by weight of the (A) component organic polymer.
10 . A one-pack curable composition
which comprises the curable composition according to claim 1 .
11 . A sealant
which comprises the curable composition according to claim 1 .
12 . An adhesive
which comprises the curable composition according to claim 1 .