Crosslink agents

1. A compound of formula

wherein R 1 , R 2 , R 3 , R 4 , R 7 and R 8 are independently selected from hydrogen, C 1 -C 4 alkyl, C 1 -C 2 alkanol or hydroxyl;

A is [SiR 5 R 6 O] W SiR 5 R 6 , wherein R 5 and R 6 are independently selected from C 1-4 alkyl or phenyl, and w is from 0 to 60;

m and n are integers independently selected from 1 to 10; p is 1; and q is an integer from 0 to 6; and R 9 is hydrogen, C 1 -C 4 alkyl or C 1 -C 2 alkanol.

2. The compound of claim 1 wherein m and n are 2 or 3, and R 1 , R 2 , R 3 and R 4 are hydrogen.

3. The compound of claim 2 wherein q is 0, 1 or 2.

4. An ophthalmic lens comprising the reaction product of monomeric units of hydrophilic monomer, monomeric units of silicone-containing lens monomer and at least one crosslink agents of formula

wherein R 1 , R 2 , R 3 , R 4 , R 7 and R 8 are independently selected from hydrogen, C 1 -C 4 alkyl, C 1 -C 2 alkanol or hydroxyl;

A is [SiR 5 R 6 O] W SiR 5 R 6 , wherein R 5 and R 6 are independently selected from C 1-4 alkyl or phenyl, and w is from 0 to 60;

m and n are integers independently selected from 1 to 10; p is 1; and q is an integer from 0 to 6; and R 9 is hydrogen, C 1 -C 4 alkyl or C 1 -C 2 alkanol.

5. The ophthalmic lens of claim 4 wherein the hydrophilic monomer is selected from the group consisting of N-vinyl pyrrolidone, N-vinyl piperidone, N-vinyl-ε-caprolactam, N-vinylimidazolidone, N-vinylsuccinimide, N-vinylforamide and mixtures thereof.

6. The ophthalmic lens of claim 4 wherein the hydrophilic monomer is N-vinyl pyrrolidone.

7. A compound of formula II

wherein R 1 , R 2 , R 3 , R 4 , R 7 and R 8 are independently selected from hydrogen, C 1 -C 4 alkyl, C 1 -C 2 alkanol or hydroxyl;

A is [SiR 5 R 6 O] W SiR 5 R 6 , wherein R 5 and R 6 are independently selected from C 1-4 alkyl or phenyl, and w is from 0 to 60;

m and n are integers independently selected from 1 to 10; p is 1; and q is an integer from 0 to 6.

8. The compound of claim 7 wherein m and n are 2 or 3, q is 0, 1 or 2 and R 1 , R 2 , R 3 and R 4 are hydrogen.

9. A compound of formula

wherein R 1 , R 2 , R 3 , R 4 , R 7 and R 8 are independently selected from hydrogen, C 1 -C 4 alkyl, C 1 -C 2 alkanol or hydroxyl;

A is [SiR 5 R 6 O] W SiR 5 R 6 , wherein R 5 and R 6 are independently selected from C 1-4 alkyl or phenyl, and w is from 0 to 60;

m and n are integers independently selected from 1 to 10; p is 1; and q is an integer from 0 to 6; and R 9 is hydrogen, C 1 -C 4 alkyl or C 1 -C 2 alkanol.

10. The compound of claim 9 wherein m and n are 2 or 3, and R 1 , R 2 , R 3 and R 4 are hydrogen.

11. An ophthalmic lens comprising the reaction product of monomeric units of hydrophilic monomer, monomeric units of silicone-containing lens monomer and at least one crosslink agents of formula

wherein R 1 , R 2 , R 3 , R 4 , R 7 and R 8 are independently selected from hydrogen, C 1 -C 4 alkyl, C 1 -C 2 alkanol or hydroxyl;

A is [SiR 5 R 6 O] W SiR 5 R 6 , wherein R 5 and R 6 are independently selected from C 1-4 alkyl or phenyl, and w is from 0 to 60;

m and n are integers independently selected from 1 to 10; p is 1; and q is an integer from 0 to 6; and R 9 is hydrogen, C 1 -C 4 alkyl or C 1 -C 2 alkanol.

12. The ophthalmic lens of claim 11 wherein the hydrophilic monomer is selected from the group consisting of N-vinyl pyrrolidone, N-vinyl piperidone,

N-vinyl-ε-caprolactam, N-vinylimidazolidone, N-vinylsuccinimide, N-vinylforamide and mixtures thereof.

13. The ophthalmic lens of claim 11 wherein the hydrophilic monomer is N-vinyl pyrrolidone.