Curable compositions

The curable composition according to claim 11

• wherein the vinyl polymer (A2) is obtainable by a process comprising:
• (1) a step of polymerizing a vinyl monomer by an atom transfer radical polymerization technique to synthesize a halogen-terminated vinyl polymer,
• (2) a step of reacting the halogen-terminated vinyl polymer obtained in said step (1) with an alkenyl group-containing oxyanion to effect substitution for the halogen and thereby synthesize an alkenyl-terminated vinyl polymer, and
• (3) a step of adding a hydrosilane compound having a crosslinkingsilyl group represented by the general formula (1) to the terminal alkenyl group of the alkenyl-terminated vinyl polymer obtained in said step (2) to convert the terminal alkenyl group to a substituent containing said crosslinking silyl group.

The curable composition according to claim 11

• wherein the vinyl polymer (A2) is obtainable by a process comprising
• (1) a step of polymerizing a vinyl monomer by a living radical polymerization technique to prepare a vinyl polymer,
• (2) a step of reacting the polymer further with a compound having at least two sparingly polymerizable alkenyl groups to synthesize an alkenyl-terminated vinyl polymer, and
• (3) a step of adding a hydrosilane compound having a crosslinking silyl group represented by the general formula (1) to the terminal alkenyl group of the alkenyl-terminated vinyl polymer obtained in said step (2) to convert the terminal alkenyl group to a substituent containing said crosslinking silyl group.

A curable composition comprising the following two components:

• (A4) a vinyl polymer having not less than 1.1 of crosslinking silyl group of the general formula (1) on the average per molecule:
• —[Si(R1)2-b(Y)bO]m—Si(R2)3-a(Y)a (1)
• wherein R1 and R2 may be the same or different and each represents an alkyl group containing 1 to 20 carbon atoms, an aryl group containing 6 to 20 carbon atoms, an aralkyl group containing 7 to 20 carbon atoms, or a triorganosiloxy group of the formula (R′)3SiO—, where R′ represents a univalent hydrocarbon group containing 1 to 20 carbon atoms and the plurality of R′ groups may be the same or different, and when two or more R1 or R2 groups are present, the plurality of groups may be the same or different;
• Y represents a hydroxyl group or a hydrolyzable group and, when two or more Y groups are present, they may be the same or different;
• a represents an integer of 0, 1, 2 or 3;
• b represents an integer of 0, 1 or 2;
• m is an integer of 0 to 19;
• with the condition that the relation of a+mb≧1 is satisfied and
• (E) a reactive plasticizer comprising a vinyl polymer having not more than one of crosslinking silyl group of the general formula (1) on the average per molecule.

A curable composition comprising the following two components:

• (A5) a vinyl polymer having at least one crosslinking silyl group of the general formula (1) on the average per molecule the main chain of which polymer has been obtained by a living polymerization technique;
• —[Si(R1)2-b(Y)bO]m—Si(Fe)3-a(Y)a (1)
• wherein R1 and R2 may be the same or different and each represents an alkyl group containing 1 to 20 carbon atoms, an aryl group containing 6 to 20 carbon atoms, an aralkyl group containing 7 to 20 carbon atoms, or a triorganosiloxy group of the formula (R′)3SiO—, where R′ represents a univalent hydrocarbon group containing 1 to 20 carbon atoms and the plurality of R′ groups may be the same or different, and when two or more R1 or R2 groups are present, the plurality of groups may be the same or different;
• Y represents a hydroxyl group or a hydrolyzable group and, when two or more Y groups are present, they may be the same or different;
• a represents an integer of 0, 1, 2 or 3;
• b represents an integer of 0, 1 or 2;
• m is an integer of 0 to 19;
• with the condition that the relation of a+mb≧1 is satisfied and
• (F) a compound (I) having one silanol group per molecule and/or a compound (II) capable of reacting with moisture to give a compound having one silanol group per molecule.