Polymerizable polysiloxanes with hydrophilic substituents
View Patent ↗The invention provides a hydrophilized polydiorganosiloxane vinylic crosslinker which comprises (1) a polydiorganosiloxane polymer chain comprising dimethylsiloxane units and hydrophilized siloxane unit having one methyl substituent and one monovalent C 10 -C 50 organic substituent having two or three carboxy groups, wherein the molar ratio of the hydrophilized siloxane units to the dimethylsiloxane units is from about 0.035 to about 0.25, and (2) two terminal (meth)acryloyl groups. The hydrophilized polydiorganosiloxane vinylic crosslinker has a number average molecular weight of greater than 3000 Daltons. The present invention is also related to a silicone hydrogel contact lens, which comprises repeating units derived from a hydrophilized polydiorganosiloxane vinylic crosslinker of the invention. In addition, the invention provides a method for making silicone hydrogel contact lenses using a lens-forming formulation comprising hydrophilized polydiorganosiloxane vinylic crosslinker of the invention.
1. A hydrophilized polydiorganosiloxane vinylic crosslinker, comprising: (1) a polydiorganosiloxane polymer chain comprising dimethylsiloxane units and hydrophilized siloxane unit having one methyl substituent and one monovalent C 10 -C 50 organic substituent having at least two carboxy groups, wherein the molar ratio of the hydrophilized siloxane units to the dimethylsiloxane units is from about 0.035 to about 0.25; (2) two terminal (meth)acryloyl groups, wherein the hydrophilized polydiorganosiloxane vinylic crosslinker has a number average molecular weight of at least about 3000 Daltons.
2. The hydrophilized polydiorganosiloxane vinylic crosslinker of claim 1 , wherein the hydrophilized polydiorganosiloxane vinylic crosslinker is a polymer of formula (1)
in which:
υ1 is an integer of from 30 to 500 and ω1 is an integer of from 1 to 75, provided that ω1/υ1 is from about 0.035 to about 0.25;
X 0 is O or NR′ in which R′ is hydrogen or C 1 -C 10 -alkyl;
R 1 is hydrogen or methyl;
R 2 and R 3 independently of each other are a substituted or unsubstituted C 1 -C 10 alkylene divalent radical or a divalent radical of R 5 —O—R 6 — in which R 5 and R 6 independently of each other are a substituted or unsubstituted C 1 -C 10 alkylene divalent radical;
R 4 is a monovalent radical of formula (2)
q1 is zero or 1;
n1 is an integer of 2 to 4;
R 7 is hydrogen, methyl, or a radical of
R 8 is ethyl or a radical of
provided that at least one of R 7 and R 8 is a radical of
3. The hydrophilized polydiorganosiloxane vinylic crosslinker of claim 2 , wherein R 4 is of formula (2) in which n1 is 3, q1 is 1, R 7 is hydrogen, R 8 is a radical of
4. The hydrophilized polydiorganosiloxane vinylic crosslinker of claim 2 , wherein R 4 is of formula (2) in which n1 is 3, q1 is 1, R 7 is a radical of
R 8 is ethyl.
5. The hydrophilized polydiorganosiloxane vinylic crosslinker of claim 2 , wherein R 4 is of formula (2) in which n1 is 3, q1 is 1, R 7 and R 8 are a radical of
6. The hydrophilized polydiorganosiloxane vinylic crosslinker of claim 3 , wherein in formula (1) ω1/υ1 is from about 0.040 to about 0.18.
7. The hydrophilized polydiorganosiloxane vinylic crosslinker of claim 3 , wherein the hydrophilized polydiorganosiloxane vinylic crosslinker has a number average molecular weight of from about 4000 Daltons to about 80,000 Daltons.
8. The hydrophilized polydiorganosiloxane vinylic crosslinker of claim 3 , wherein in formula (1) X 0 is O.
9. The hydrophilized polydiorganosiloxane vinylic crosslinker of claim 3 , wherein in formula (1) X 0 is NR′ in which R′ is hydrogen or C 1 -C 10 -alkyl.
10. The hydrophilized polydiorganosiloxane vinylic crosslinker of claim 4 , wherein in formula (1) ω1/υ1 is from about 0.040 to about 0.18.
11. The hydrophilized polydiorganosiloxane vinylic crosslinker of claim 4 , wherein the hydrophilized polydiorganosiloxane vinylic crosslinker has a number average molecular weight of from about 4000 Daltons to about 80,000 Daltons.
12. The hydrophilized polydiorganosiloxane vinylic crosslinker of claim 4 , wherein in formula (1) X 0 is O.
13. The hydrophilized polydiorganosiloxane vinylic crosslinker of claim 3 , wherein in formula (1) X 0 is NR′ in which R′ is hydrogen or C 1 -C 10 -alkyl.
14. The hydrophilized polydiorganosiloxane vinylic crosslinker of claim 5 , wherein in formula (1) ω1/υ1 is from about 0.040 to about 0.18.
15. The hydrophilized polydiorganosiloxane vinylic crosslinker of claim 5 , wherein the hydrophilized polydiorganosiloxane vinylic crosslinker has a number average molecular weight of from about 4000 Daltons to about 80,000 Daltons.
16. The hydrophilized polydiorganosiloxane vinylic crosslinker of claim 5 , wherein in formula (1) X 0 is O.
17. The hydrophilized polydiorganosiloxane vinylic crosslinker of claim 5 , wherein in formula (1) X 0 is NR′ in which R′ is hydrogen or C 1 -C 10 -alkyl.