Methyl styrene as a high index of refraction monomer

• US 6,107,364 A
• Filed: 05/09/1997
• Issued: 08/22/2000
• Est. Priority Date: 05/09/1997
• Status: Expired due to Fees

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Olson, David B., Fong, Bettie C.
• Primary Examiner(s): Truong, Duc
• Application Number:
  US08/853,982
• Time in Patent Office: 1,201 Days
• Field of Search: 522/188, 522/187, 522/182, 522/102, 351/159, 359/385, 526/292.3, 526/296, 428/176
• US Class Current: 522/182
• CPC Class Codes: C08F 212/12 Monomers containing a branched unsaturated aliphatic radical or a ring substituted by an alkyl radical
• CPC Class Codes: C08L 25/16 Homopolymers or copolymers of alkyl-substituted styrenes
• CPC Class Codes: G02B 1/04 made of organic materials, e.g. plastics G02B1/08 takes precedence
• CPC Class Codes: Y10T 428/24645 with folds in parallel planes

Abstract

Described are a polymerizable composition comprising methyl styrene monomer, polymers comprising monomeric units derived from methyl styrene monomers, and optical products comprising these polymers.

Claims

1. A polymerizable composition comprising methyl styrene monomer of the general formula:

##STR17## one or more comonomers comprising at least one high index of refraction comonomer.

2. The composition of claim 1, wherein the high index of refraction comonomer has an index of refraction of at least 1.50.

3. The composition of claim 1, wherein the comonomers comprise an unsaturated aromatic comonomer.

4. The composition of claim 1, wherein the comonomers comprise a (meth)acrylate monomer.

5. The composition of claim 1, wherein the comonomers comprise a brominated comonomer.

6. The composition of claim 1, wherein the comonomers comprise a brominated (meth)acrylate comonomer.

7. The composition of claim 1, wherein the comonomers comprise an alkyl-substituted brominated aromatic ester (meth)acrylate monomer.

8. The composition of claim 7, wherein the brominated aromatic (meth)acrylate comonomer comprises monomer of the general formula:

##STR18## wherein R can be hydrogen or methyl, R^A can be a straight or branched alkyl, and x can be in the range from about 1 to 4.

9. The composition of claim 1, wherein the polymerizable composition comprises from about 5 to 15 parts by weight methyl styrene monomer, based on 100 parts polymerizable composition.

10. The composition of claim 1, comprising:

from 5 to 40 parts by weight methyl styrene monomer; and

from 60 to 95 parts by weight comonomer.

11. The composition of claim 1, comprising:

from 5 to 25 parts by weight methyl styrene monomer;

from 10 to 15 parts by weight non-halogenated (meth)acrylate monomer; and

from 65 to 80 parts by weight brominated aromatic (meth)acrylate monomer.

12. A polymerizable composition comprising methyl styrene monomer of the general formula:

##STR19## wherein the polymerizable composition has an index of refraction of at least 1.55.

13. The polymerizable composition of claim 12, wherein the index of refraction is at least 1.56.

14. An optical product comprising a polymeric material comprising monomeric units derived from methyl styrene monomer of the general formula:

##STR20##

15. The optical product of claim 14, wherein the polymeric material comprises monomeric units further derived from a high index of refraction comonomer.

16. The optical product of claim 15, wherein the high index of refraction monomer has an index of refraction of at least 1.50.

17. The optical product of claim 15, wherein the comonomer comprises an unsaturated aromatic comonomer.

18. The optical product of claim 15, wherein the comonomer comprises a (meth)acrylate monomer.

19. The optical product of claim 15, wherein the comonomer comprises a brominated comonomer.

20. The optical product of claim 15, wherein the comonomer comprises a brominated (meth)acrylate comonomer.

21. The optical product of claim 15, wherein the comonomers comprise an alkyl-substituted brominated aromatic ester (meth)acrylate monomer.

22. The optical product of claim 21, wherein the brominated aromatic (meth)acrylate comonomer comprises monomer of the general formula:

wherein R can be hydrogen or methyl, R^A can be a straight or branched alkyl, and x can be in the range from about 1 to 4.

23. The optical product of claim 15, wherein the polymerizable composition comprises from about 5 to 15 parts by weight methyl styrene monomer, based on 100 parts polymerizable composition.

24. The optical product of claim 14, comprising:

from 5 to 40 parts by weight methyl styrene monomer; and

from 60 to 95 parts by weight comonomer.

25. The optical product of claim 14, comprising:

from 5 to 25 parts by weight methyl styrene monomer;

from 10 to 15 parts by weight non-halogenated (meth)acrylate monomer; and

from 65 to 80 parts by weight brominated aromatic (meth)acrylate monomer.

26. The optical product of claim 14, comprising a film derived from the methyl styrene monomer.

27. The optical product of claim 14, comprising

a base;

and

an optical layer prepared from a polymerizable composition, the polymerizable composition comprising methyl styrene monomer.

28. The optical product of claim 27, wherein the base is prepared from materials selected from the group consisting of:

cellulose acetate butyrate, cellulose acetate propionate, polyether sulfone, polymethyl methacrylate, polyurethane, polyester, polyvinyl chloride, syndiotactic polystyrene, polyethlene naphthalate, copolymers or blends based on naphthalene dicarboxylic acids, and glass.

29. The optical product of claim 28, wherein the base comprises a polarizer.

30. The optical product of claim 14, comprising a brightness enhancement film derived from the methyl styrene monomer.

31. A backlit flat panel display comprising the brightness enhancement film of claim 30.

32. A computer or television comprising the backlit flat panel display of claim 31.

33. A microstructure-bearing article comprising an optical layer derived from a polymerizable composition comprising methyl styrene monomer.