Actinically-crosslinkable siloxane-containing copolymers

An actinically crosslinkable prepolymer of formula (1) or (2)

• in which
• r1 is an integer of 2 or 3, r2 and r2′ are either 0 or 1 provided that (r2+r2′)=1;
• G1 and G2 independent of each other are a linear or branched C1-C10alkylene divalent radical, a divalent radical of
• in which q is an integer of from 1 to 5 and alk and alk′ independent of each other is a C1-C6 alkylene divalent radical, or a divalent radical of —R′1—X5-E-X6—R′2— in which R′1 and R′2 independent of each other is a linear or branched C1-C10 alkylene divalent radical or a divalent radical of
• as defined above, X5 and X6 independent of each other are a linkage selected from the group consisting of
• in which R′ is H or C1-C8 alkyl, E is an alkyl diradical, a cycloalkyl diradical, an alkylcycloalkyl diradical, an alkylaryl diradical, or an aryl diradical with up to 40 carbon atoms which may have ether, thio, or amine linkages in the main chain, provided that if r2 is 0, then r1 is integer 2 or 3 and G2 is a linear or branched C1-C10 alkyl radical or a monovalent radical of
• in which q and alk′ are defined as above and alk″ is C1-C6 alkyl;
• X1 and X2 independent of each other are a linkage selected from the group consisting of a direct bond,
• in which R′ is H or C1-C8 alkyl;
• PDMS is a polysiloxane divalent radical of formula (3)
• in which ν is 0 or 1, ω is an integer of from 0 to 5, U1 and U2 independent of each other represent a divalent radical of —R′1—X5-E-X6—R′2— as defined above or a divalent radical of
• as defined above, D1, D2 and D3 independently of each other are a divalent radical selected from the group consisting of —(CH2CH2O)t—CH2CH2— in which t is an integer of 3 to 40, —CF2—(OCF2)a—(OCF2CF2)b—OCF2— in which a and b independent of each other is an integer of 0 to 10 provided that a+b is a number in the range of 10 to 30, and a divalent group of formula (4)
• in which R3, R4, R5′, R6, R7, R8, R9 and R10, independently of one another, are C1-C8-alkyl, C1-C4 alkyl- or C1-C4-alkoxy-substituted phenyl, fluoro(C1-C18-alkyl), cyano(C1-C12-alkyl), -alk-(OCH2CH2)n—OR11 in which alk is C1-C6-alkylene divalent radical, R11 is C1-C6 alkyl and n is an integer from 1 to 10, m and p independently of each other are an integer of from 2 to 698 and (m+p) is from 5 to 700, provided that at least one of D1, D2 and D3 is represented by formula (4);
• L1 and L2 independent of each other are an organic radical having a valence of (r1+1), where the organic radical is a linear or branched C1-C14 aliphatic radical, a C5-C45 cycloaliphatic or aliphatic-cycloaliphatic di-, tri-, or tetra-valent radical, or a C6-C24 aromatic or araliphatic di-, tri-, or tetra-valent radical, provided that each of L1 and L2 has valence of (r1+1);
• and
• A1 and A2 independently of each other are a monovalent radical of formula (5)
• in which r4 is an integer of 0 or 1;
• X7 is —O— or
• in which R′ is H or C1-C8 alkyl;
• X8 is a linkage selected from the group consisting of
• in which R′ is H or C1-C8 alkyl;
• G5 is a linear or branched C1-C10 alkylene divalent radical, a divalent radical of
• as defined above, or a divalent radical of —R′1—X5-E-X6—R′2— as defined above;
• G6 is a C2-C6 alkylene divalent radical;
• LC is a divalent radical of a linear polymer chain of one or more hydrophilic vinylic monomers;
• and AX is a thiol group or a radical of formula —X8-G7-X9-Q, in which:
• X8 is an linkage as defined above;
• G7 is a direct bond or a linear or branched alkylene divalent radical;
• X9 is a direct bond or a linkage selected from the group consisting of
• Q is an acryloyl group, a methacryloyl group, a vinyl group, an allyl group, or a norbornenyl group.