Abstract A curable composition is disclosed. The composition comprises (A) 100 parts by weight of a oxypropylene polymer having groups containing silicon atoms bonded to a hydroxy group and/or a hydrolyzable group and capable of crosslinking by forming a siloxane bond, a Mw/Mn value of not more than 1.6, and an average molecular weight of at least 6,000, (B) from 100 to 200 parts by weight of calcium carbonate containing at least 30% by weight calcium carbonate of an average particle size of not larger than 0.5 µm and surface-treated with a fatty acid, (C) from 30 to 100 parts by weight of a plasticizer containing at least 5% by weight phthalic acid ester plasticizer, (D) from 0.5 to 10 parts by weight of a compound represented by the formula R¹Si(OCH₃)₃ and/or Si(OCH₂CH₃)₄ (wherein R¹ represents a monovalent organic group containing no amino groups), (E) from 0.5 to 10 parts by weight of a compound represented by following formula (1), R²Si(CH₃) n (OR³) 3-n (1) wherein R² represents a monovalent organic group having at least one amino group; R³ represents CH₃ or CH₂CH₃; and n represents 0 or 1 and (F) from 0.5 to 5 parts by weight of an organotin curing catalyst, the total amount of said components (D) and (E) being at least 2 parts by weight, and said component (A) occupying from 15 to 35% by weight.
A curable composition comprising (A) 100 parts by weight of a oxypropylene polymer having groups containing a silicon atom to which a hydroxy group and/or a hydrolyzable group is bonded and capable of crosslinking by forming a siloxane bond, a Mw/Mn value of not more than 1.6, and an average molecular weight of at least 6,000, (B) from 100 to 200 parts by weight of calcium carbonate containing at least 30% by weight calcium carbonate of an average particle size of not larger than 0.5 µm, and surface-treated with a fatty acid, (C) from 30 to 100 parts by weight of a plasticizer containing at least 5% by weight phthalic acid ester plasticizer, (D) from 0.5 to 10 parts by weight of a compound represented by the formula R¹Si(OCH₃)₃ and/or Si(OCH₂CH₃)₄ (wherein R¹ represents a monovalent organic groups containing no amino group), (E) from 0.5 to 10 parts by weight of a compound represented by following formula (1), R²Si(CH₃) n (OR³) 3-n (1) wherein R² represents a monovalent organic group having at least one amino group; R³ represents CH₃ or CH₂CH₃; and n represents 0 or 1 and (F) from 0.5 to 5 parts by weight of an organotin curing catalyst, the total amount of said components (D) and (E) being at least 2 parts by weight, and said component (A) occupying from 15 to 35% by weight.
Claim 2
Dependent Claim
203 words
The curable composition of claim 1, wherein the groups containing a silicon atom to which a hydroxy group and/or a hydrolyzable group is bonded and capable of crosslinking by forming siloxane bond, is a group represented by following formula (2); wherein R⁴ and R⁵ each represents an alkyl group having from 1 to 20 carbon atoms, an aryl group having from 6 to 20 carbon atoms, an aralkyl group having from 7 to 20 carbon atoms, or a triorganosiloxy group represented by the formula (R')₃SiO- (wherein R' represents a monovalent hydrocarbon group having from 1 to 20 carbon atoms and three R's may be the same or different), when two or more R⁴ and R⁵ exist, they may be the same or different; X represents a hydroxy group or a hydrolyzable group, when two or more Xs exist, they may be the same or different; a represents 0 or an integer of from 1 to 3; b represents 0 or an integer of from 1 to 2; and when two or more exist b s in may be the same or different; m represents 0 or an integer of from 1 to 19, said a and b satisfying a + Σb ≧ 1.
Claim 3
Dependent Claim
52 words
The curable composition of claim 1 or 2, wherein the groups containing silicon atoms to which a hydroxy group and/or a hydrolyzable group is bonded and capable of crosslinking by forming a siloxane bond are groups represented by the formula; wherein R⁴, X, and a are same as described in claim 2.
Claim 4
Dependent Claim
34 words
The curable composition of any one of claims 1 to 3, wherein the molecular weight of the oxypropylene polymer of component (A) is at least 10,000 and Mw/Mn thereof is not more than 1.5.
Claim 5
Dependent Claim
20 words
The curable composition of any one of claims 1 to 3, wherein the phthalic acid ester plasticizer is di(2-ethylhexyl phthalate).