Silicone containing polymeric materials
View Patent ↗A polymeric material with a variable modulus of elasticity is described herein. The polymeric material described herein is useful for forming implantable medical devices (e.g. ophthalmic lenses, breast implants, and body augmentation devices). In addition, medical devices formed from the polymer material can be used to controllably release a therapeutic agent. Also, the polymeric material may be used to prepare topical compositions or other applications or devices where control of a mechanical property such as material modulus is important.
1. A method of forming an elastomeric article of manufacture comprising;
a. providing polymers having a general structure of formula 1, wherein said polymer comprises at least one pendent vinyl group,
wherein the sum of m and n is x, x ranges from 0 to less than 1000, y ranges from 0 to about 500, and z ranges from 0 to about 500, the sum of x, y, and z is from about 500 to less than 1000, R 1 -R 8 are each independently CH 3 , C 6 H 5 or CH═CH 2 , if m is greater than zero, at least one of R 4 or R 5 must be CH═CH 2 , and
wherein more than two of R 1 , R 2 , R 3 , R 6 , R 7 , or R 8 are CH═CH 2
b. providing a nonpolymeric cross-linker;
c. providing a catalyst;
d. combining said polymer, said cross-linker and said catalyst to form a polymeric mixture; and
e. curing said polymeric mixture;
wherein at least a portion of said elastomeric article of manufacture is formed, said polymeric mixture comprises a hydride to vinyl ratio ranging from about 0.5:1 to about 1.5:1.
2. The method according to claim 1 , wherein said article of manufacture is selected from the group consisting of intraocular lenses, corneal implants, contact lenses, ocular lenses, body augmentation implants, medical device coatings and breast implants.
3. The method according to claim 1 , wherein said article of manufacture is capable of controlled release of a therapeutic agent.
4. The method according to claim 1 , wherein the cross-linker is selected from the group consisting of phenyltris(dimethylsiloxy)silane, 1,1,3,3-tetraisopropyldisiloxane, 1,1,3,3-tetramethyldisiloxane, 1,1,4,4-tetramethyldisilethane, bis(dimethylsilyl)ethane, 1,1,3,3-tetramethyldisilazane, and tetrakis(ditnethylsiloxy)silane.
5. The method according to claim 1 , wherein said polymer comprises an average of three or more vinyl terminations.
6. The method according to claim 1 , wherein said polymer is hexavinyl terminated.
7. The method according to claim 1 , wherein a molar ratio of m+n+y+z=1; m=about 0 to about 0.01; n=about 0.6 to about 0.9; y=about 0.07 to 0.55; and z=about 0.0 to about 0.9.