Patent ID: 7910681

Claim:
A sealant comprising a curable composition, the curable composition comprising (A) an organic polymer containing a silicon-containing group being capable of crosslinking by forming siloxane bonds and (B) a titanium catalyst, wherein the curable composition further contains a silane compound having an amino group as a low molecular weight compound (C) containing a hydrolyzable silicon group and having a molecular weight of 100 to 1,000, wherein said titanium catalyst is a titanium chelate which is a compound represented by the general formula (2): wherein R 2 and R 3 are hydrogen atoms or a hydrocarbon group having 1 to 20 carbon atoms, R 2 and R 3 may be the same or different, each of the n R 2 s may be the same or different, and each of the (4−n) R 3 s may be the same or different; A 1 and A 2 are selected from the group consisting of —R 4 or —OR 4 where R 4 is a hydrocarbon group having 1 to 20 carbon atoms, A 1 and A 2 may be the same or different, each of the (4−n) A 1 s may be the same or different and each of the (4−n) A 2 s may be the same or different; n is 2, wherein with respect to 100 parts by weight of the organic polymer (A), said titanium catalyst (B) is contained in an amount of from 0.1 to 20 parts by weight and said low molecular weight compound (C) is contained in an amount of from 0.1 to 15 parts by weight, and wherein a main chain skeleton of said organic polymer (A) is a polyoxyalkylene polymer wherein said organic polymer (A) has a stress at 50% tension of not less than 0.01 MPa and not more than 0.20 MPa, and wherein stress at 50% tension is measured by adding and mixing 1.5 parts by weight of tin octylate, 0.25 parts by weight of laurylamine and 0.6 parts by weight of pure water to 100 parts by weight of the organic polymer, the mixture subjected to centrifugal defoaming is carefully poured into a polyethylene frame not to mix air bubbles thereto, and aged at 23° C. for one hour, and further at 70° C. for 20 hours, the obtained 3 mm thick cured sheet is punched according to JIS K6251 to obtain No. 3 dumbbell, and a tension test at tensile speed: 200 mm/min is carried out at 23° C. at 50% RH to determine a stress at 50% tension.