Polymerizable chain-extended polysiloxanes with pendant hydrophilic groups

A chain-extended polysiloxane crosslinker, being represented by formula (I)

• in which:
• ν and ω independent of each other are an integer of from 0 to 20 provided that (ν+ω) is an integer of 1 to 20,
• D1, D2 and D3 independently of each other are a divalent group of formula (II)
• in which A1 and A2 independent of each other are a direct bond, a linear or branched C1-C10 alkylene divalent radical, —(CH(R″)CH2O)r3—CH(R″)CH2— in which R″ is H or methyl and r3 is an integer of 1 to 20, or a C1-C7 alkyleneoxy C1-C7 alkylene divalent radical, and R1, R2, R3, R4, R5, R6, R7, and R8, independently of C1-C4 alkyl-substituted phenyl, C1-C4-alkoxy-substituted phenyl, fluoro(C1-C18-alkyl), or -alk-(OCH2CH2)n—OR9— radical, R9 is C1-C6 alkyl and n is an integer from 1 to 20, m and p independently of each other are an integer of from 0 to 150 and (m+p) is from 1 to 150;
• G1, G2, G3, G4, G5, and G6 independent of each other are a direct bond or a divalent radical of formula (III)
• L1 and L2 independent of each other are a direct bond or a divalent radical of formula (IV)
• X1, X2, and X3 independent of each other are a linkage selected from the group consisting of a direct bond, —O—, —NR′—, —S—, —C(O)—NR′—, —NR″—C(O)—, —O—C(O)—NH—, —C(O)—O—, —O—C(O)—, —NH—C(O)—O—, —NR′—C(O)—NH—, and —NH—C(O)—NR′—, in which R′ is H or C1-C8 alkyl;
• r1, r2, q1, q2, q3, and q4 independent of one another are an integer of 0 or 1;
• Y1 and Y2 independent of each other are a direct bond, —O— or —NR′— with R′ as defined above;
• Z1, Z2, Z3, Z4, Z5, Z6, and BG independent of each other are a direct bond, a linear or branched C1-C12 alkylene divalent radical, a linear or branched C3-C7 alkylene divalent radical having at least one hydroxyl or carboxyl group or —OC(O)(CH2)t1COOH in which t1 is an integer of 2 to 4, a C1-C7 alkyleneoxy C1-C7 alkylene divalent radical, a divalent radical of —[CH2CH(T)CH2O]r4—[CH(R″)CH2O]r3—[CH2CH(T)CH2]r5— in which R″ and r3 are as defined above, T is a hydroxyl or carboxyl group, and r4 and r5 independent of each other are 0 or 1, an unsubstituted phenylene divalent radical, C1-C4 alkyl substituted phenylene divalent radical, C1-C4 alkoxy substituted phenylene divalent radical, C7-C12 aralkylene divalent radical, a C5-C45 cycloaliphatic divalent radical, a C5-C45 aliphatic-cycloaliphatic divalent radical, a C6-C24 aromatic divalent radical, a C6-C24 araliphatic divalent radical, or combinations thereof;
• R10, R11, R12, R13, R14, R15, R16, R17, R18, and R19 independent of each other are hydrogen or C1-C4 alkyl;
• provided that BG and/or at least one of G2, G3, G4, and G5 comprises at least one hydroxyl or carboxyl group or at least one radical of —OC(O)(CH2)t1COOH with t1 as defined above.