Curable siloxane compositions

A curable composition comprising

• at least one polysiloxane having the general structural formula (I):
• wherein
• each occurrence of R1, R2 and R3 is independently a linear or branched aliphatic group containing up to about 20 carbon atoms, an unsubstituted or substituted aryl group containing from about 6 to about 18 carbon atoms, optionally containing at least one heteroatom, and an alicyclic group containing up to about 20 carbon atoms;
• each occurrence of R4 is independently a divalent alkyl group of from about 1 to about 6 carbon atoms, a divalent unsubstituted or substituted aryl group containing up to about 18 carbon atoms, a divalent unsubstituted or substituted alicyclic group containing up to about 18 carbon atoms, a divalent unsubstituted or substituted acyl group containing up to about 18 carbon atoms, a divalent ester group containing up to about 8 carbon atoms, or a divalent ether group containing up to about 8 carbon atoms;
• each occurrence of Z is independently selected from a divalent linear, branched or cyclic alkyl group containing from about 2 to about 25 carbon atoms, a divalent linear, branched or cyclic alkenyl group containing from about 2 to about 25 carbon atoms, and a divalent unsubstituted or substituted, aryl group of up to about 20 carbon atoms;
• each occurrence of M is independently a hydroxy group, an alkynyl group of from about 2 to about 12 carbon atoms, an amino group, an alkoxy group containing from about 1 to about 8 carbon atoms, an alkoxyalkyl group containing from about 2 to about 1 carbon atoms, an oximoalkyl group containing up to about 8 carbon atoms, an enoxyalkyl group containing up to about 8 carbon atoms, an aminoalkyl group containing up to about 8 carbon atoms, a carboxyalkyl group containing up to about 8 carbon atoms, an amidoaliphatic group containing up to about 8 carbon atoms, an amidoaryl group containing up to about 12 carbon atoms, a carbamato alkyl group containing up to about 8 carbon atoms, an anhydride group, a carboxyl group containing up to about 8 carbon atoms, a carbonyl group, an acyl group containing up to about 8 carbon atoms, an amide group, an ionic group, an imine group containing up to about 8 carbon atoms, an isocyanate group, a nitrile group, an (meth)acryl group, an (meth)acrylol group, an alkoxysilyl group, an alkoxyalkylsilyl group, an acyloxysilyl group, a hydroxyalkylsilyl group or a thiol group;
• the subscript x is an integer of from 1 to 250, the subscript y is an integer from 0 to 100, the subscript n′ is an integer from 2 to 10,000, and the subscript in is an integer of from to 1 to 5;
• and
• at least one component selected from the group consisting of:
• a second polysiloxane of the general formula (II):
• wherein
• each of R1, R2, R3, x and y is independently a linear or branched aliphatic group containing up to about 20 carbon atoms, an unsubstituted or substituted aryl group containing from about 6 to about 18 carbon atoms, optionally containing at least one heteroatom, and an alicyclic group containing up to about 20 carbon atoms;
• each R4 is independently a divalent alkyl group of from about 1 to about 6 carbon atoms, an unsubstituted or substituted aryl group containing up to about 18 carbon atoms, an unsubstituted or substituted alicyclic group containing up to about 18 carbon atoms, an unsubstituted or substituted acyl group containing up to about 18 carbon atoms, an ester group containing up to about 8 carbon atoms, an ether group containing up to about 8 carbon atoms, or an acyl group containing up to about 8 carbon atoms;
• R5 is a hydrogen, alkyl group of from 1 to 4 carbon atoms or phenyl, with the proviso that when y is 0 or 1, R5 is hydrogen;
• the subscript x is an integer of from 1 to 250;
• and the subscript y is an integer from 0 to 100,
• a crosslinker, and
• a chain extender.

A curable composition comprising:

• (a) a polysiloxane of the general formula (I):
• and
• (b) a polysiloxane of the general formula (II):
• each of R1, R2 and R3 are independently a linear or branched aliphatic group containing up to about 20 carbon atoms, an unsubstituted or substituted aryl group containing from about 6 to about 18 carbon atoms, optionally containing at least one heteroatom, and an alicyclic group containing up to about 20 carbon atoms;
• each R4 is independently, a divalent alkyl group of from about 1 to about 6 carbon atoms, unsubstituted or substituted aryl group containing up to about 18 carbon atoms, an ester group containing up to about 8 carbon atoms, an ether group containing up to about 8 carbon atoms, or an acyl group containing up to about 8 carbon atoms;
• R5 is a hydrogen, alkyl group of from 1 to 4 carbon atoms or phenyl, with the proviso that when y is 0 or 1, R5 is hydrogen;
• each Z is independently chosen from a divalent linear, branched or cyclic alkyl group containing from about 2 to 25 carbon atoms, a divalent linear, branched or cyclic alkenyl group containing from about 2 to about 25 carbon atoms, and a divalent unsubstituted or substituted aryl group of up to about 20 carbon atoms;
• both M groups in formula (I) are alkenyl groups of from about 2 to about 12 carbon atoms;
• and
• the subscript x is an integer of from 1 to 250, the subscript y is an integer from 0 to 100, the subscript n′ is an integer greater than or equal to 2, and the subscript m is an integer of from to 1 to 5.

A curable composition comprising:

• (a) at least one polysiloxane of the general formula (I)
• wherein
• each of R1, R2 and R3 are independently a linear or branched aliphatic group containing up to about 20 carbon atoms, an unsubstituted or substituted aryl group containing from about 6 to about 18 carbon atoms, optionally containing at least one heteroatom, and at alicyclic group containing up to about 20 carbon atoms;
• each R4 is independently, a divalent alkyl group of from about 1 to about 6 carbon atoms, an unsubstituted or substituted aryl group containing up to about 18 carbon atoms, an ester group containing up to about 8 carbon atoms, an ether group containing up to about 8 carbon atoms, or an acyl group containing up to about 8 carbon atoms;
• each Z is independently chosen from a divalent linear, branched or cyclic alkyl group containing from about 2 to about 25 carbon atoms, a divalent linear, branched or cyclic alkenyl group containing from about 2 to about 25 carbon atoms, and a divalent unsubstituted or substituted aryl group of up to about 20 carbon atoms;
• each M is independently chosen from an alkenyl group, an alkynyl group, an amino group, an alkoxy group, an alkoxyalkyl, an oximoalkyl, an enoxyalkyl, an aminoalkyl, a carboxyalkyl, an amidoalkyl, an amidoaryl, a carbamatoalkyl, an epoxy group, an anhydride group, a carboxyl group, a carbonyl group, an acyl group, an amide group, an ionic group, an amine group, an azo group, an imine group, an isocyanate, nitrile, nitrate, nitro, nitroso group, an acryl group, an acrylol group, an alkoxysilyl group, an alkoxyalkylsilyl group, an acyloxysilyl group, a hydroxyalkylsilyl group or a thiol group;
• x is an integer from 1 to 250, y is an integer from 0 to 100, n′ is an integer greater than 1 and m is an integer from to 1 to 5,
• (b) at least one photo-curing initiator and optionally,
• (c) at least one further component selected from the group consisting of a photo curable reactive component, a silane crosslinker, a filler, an adhesion promoter, a solvent, a photo-cure promoter and a cure retardant.