Plastic lens systems, compositions, and methods

• US 6,419,873 B1
• Filed: 03/19/1999
• Issued: 07/16/2002
• Est. Priority Date: 03/19/1999
• Status: Expired due to Term

• Current Assignee: Vision Dynamics LLC (New England Low Vision & Blindness)
• Original Assignee: Q2100, Inc.
• Inventors: Joel, Larry H., Lattis, Matthew C., Buazza, Omar M., Luetke, Stephen C., Powers, Galen R.
• Primary Examiner(s): Berman, Susan W.
• Application Number:
  US09/272,815
• Time in Patent Office: 1,215 Days
• Field of Search: 522/14, 522/64, 522/7, 522/10, 522/142, 522/141, 522/173, 522/182, 522/181, 522/100, 522/103, 522/28, 522/65, 523/106, 264/496, 264/1.38, 264/1.37, 351/168, 351/177
• US Class Current: 264/496
• CPC Class Codes: B29C 2035/0827 using UV radiation
• CPC Class Codes: B29C 2035/0833 using actinic light
• CPC Class Codes: B29C 35/0805 using electromagnetic radiation
• CPC Class Codes: B29C 35/0888 using transparant moulds
• CPC Class Codes: B29C 37/005 Compensating volume or shape change during moulding, in general
• CPC Class Codes: B29D 11/00442 Curing the lens material
• CPC Class Codes: C09K 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
• CPC Class Codes: G02B 1/041 Lenses
• CPC Class Codes: G02B 1/043 Contact lenses
• CPC Class Codes: Y10S 425/808 Lens mold

Abstract

An apparatus for preparing a plastic eyeglass lens includes a coating unit and a lens curing unit. The apparatus is preferably configured to allow the operation of both the coating unit and the lens curing unit. The apparatus may also include a post-cure unit and a controller. The controller is configured to control the operation of the coating unit, the lens curing unit and the post-cure unit. A lens forming composition may include an aromatic containing polyether polyethylenic functional monomer, a photoinitiator, and a coinitiator. The lens forming composition may be cured by the application of activating light or activating light and heat.

Claims

1. A method for making a plastic eyeglass lens, comprising:

placing a liquid lens forming composition in a mold cavity of a mold assembly, wherein the mold assembly comprises a front mold member and a back mold member, the lens forming composition comprising;

a monomer composition comprising an aromatic containing polyether polyethylenic functional monomer;

a co-initiator composition, the co-initiator composition comprising an amine; and

a photoinitiator; and

directing activating light toward at least one of the mold members to initiate curing of the lens forming composition; and

directing activating light and heat toward at least one of the mold members subsequent to initiating curing of the lens to form the eyeglass lens.

2. The method of claim 1, wherein the aromatic containing polyethylenic polyether functional monomer comprises an ethoxylated bisphenol A containing at least one group selected from acrylyl or methacrylyl.

3. The method of claim 1, wherein the co-initiator composition comprises an acrylyl amine.

4. The method of claim 3, wherein the acrylyl amine is selected from the group consisting of monoacrylated amines, diacrylated amines, or mixtures thereof.

5. The method of claim 1, wherein the lens forming composition further comprises a photochromic compound.

6. The method of claim 1, wherein the lens forming composition further comprises an ultraviolet absorbing compound for inhibiting at least a portion of ultraviolet light from being transmitted through the eyeglass lens during use.

7. The method of claim 1, wherein curing of the lens forming composition is initiated by directing activating light toward at least one of the mold members for less than 30 seconds.

8. The method of claim 1, wherein curing of the lens forming composition is initiated by directing activating light toward at least one of the mold members for less than 100 seconds.

9. The method of claim 1, wherein curing of the lens forming composition is initiated by directing activating light toward both of the mold members.

10. The method of claim 1, wherein curing of the lens forming composition is initiated by Substitute Sheet directing activating light toward the bottom mold member.

11. The method of claim 1, wherein treating the lens forming composition with activating light and heat comprises directing activating light toward at least one of the mold members and applying heat to both mold members for a time of up to about 15 minutes

12. The method of claim 1, further comprising applying heat to the lens in the absence of activating light, subsequent to directing activating light and heat toward at least one of the mold members.

13. The method of claim 1, further comprising heating the lens forming composition prior to placing the lens forming composition in a mold cavity.

14. The method of claim 1, further comprising removing the eyeglass lens from the mold cavity and applying an abrasion resistant coating to a front surface of the eyeglass lens.

15. The method of claim 1, further comprising removing the eyeglass lens from the mold cavity and tinting the eyeglass lens.

16. The method of claim 1, wherein the lens forming composition exhibits a yellow color after the curing is initiated, and wherein activating light and heat are directed toward the lens until the lens forming composition is substantially free of the yellow color.

17. The method of claim 1, wherein the eyeglass lens is an aspheric single vision lens.

18. The method of claim 1, wherein the eyeglass lens is a flat-top bifocal lens.

19. The method of claim 1, wherein the eyeglass lens is a progressive multi focal lens.

20. The method of claim 1, wherein the eyeglass lens is an aspheric single vision lens, a flat-top bifocal lens or a progressive multifocal lens.

21. The method of claim 1, wherein directing activating light toward at least one of the mold members to initiate curing is performed in a curing chamber, and wherein directing activating light and heat toward at least one of the mold members subsequent to initiating curing is performed in a post-cure chamber, and further comprising transferring the mold assembly to the post-cure chamber after the curing is initiated in the curing chamber.

22. The method of claim 1, wherein directing activating light toward at least one of the mold members is performed without cooling of the mold assembly.

23. The method of claim 1, wherein the eyeglass lens is a flat-top bifocal lens and wherein directing activating light toward at least one of the mold members to initiate curing comprises directing activating light toward the front mold member prior to directing activating light toward the back mold member.

24. The method of claim 1, wherein the eyeglass is a flat top bifocal lens, the flat-top bifocal lens comprising a near vision correction zone and a far vision correction zone, and wherein directing activating light toward at least one of the mold members to initiate curing comprises directing activating light toward the back mold member prior to directing activating light toward the front mold member, and further comprising directing activating light toward the front mold member before the lens forming composition in the far vision correction zone proximate the front mold member is substantially gelled.

25. The method of claim 1, wherein the eyeglass lens is a non-photochromic lens, and wherein directing activating light toward at least one of the mold members to initiate curing comprises directing activating light toward both mold members for a time of less than about 2 minutes, and wherein directing activating light and heat toward at least one of the mold members comprises directing activating light toward the back mold member while heating the mold assembly to a temperature of between about 200°

F. to about 225°

F. for a time of up to about 15 minutes.

26. The method of claim 1, wherein the eyeglass lens is a non-photochromic lens, and wherein directing activating light toward at least one of the mold members to initiate curing comprises directing activating light toward the front mold member for a time of less than about 10 seconds, and wherein directing activating light and heat toward at least one of the mold members comprises directing activating light toward the back mold member while heating the mold assembly to a temperature of between about 200°

F. to about 225°

F., for a time of up to about 15 minutes.

27. The method of claim 1, wherein the eyeglass lens is a photochromic lens, and wherein directing activating light toward at least one of the mold members to initiate curing comprises directing activating light toward both mold members for a time of less than about 2 minutes, and wherein directing activating light and heat toward at least one of the mold members comprises directing activating light toward the back mold member while heating the mold assembly to a temperature of between about 200°

F. to about 225°

F., for a time of up to about 15 minutes.

28. The method of claim 1, wherein the eyeglass lens is a photochromic lens, and wherein directing activating light toward at least one of the mold members to initiate curing comprises directing activating light toward the front mold member for a time of less than about 25 seconds, and wherein directing activating light and heat toward at least one of the mold members comprises directing activating light toward the back mold member while heating the mold assembly to a temperature of between about 200°

F. to about 225°

F., for a time of up to about 15 minutes.

29. The method of claim 1, wherein the eyeglass lens is a photochromic lens, and wherein directing activating light toward at least one of the mold members to initiate curing comprises directing first activating light toward the back mold member for a time of less than about 25 seconds and further comprising directing second activating light toward the front mold member for a time period of less than about 10. seconds after the directing of the first activating light is started, and wherein directing activating light and heat toward at least one of the mold members comprises directing activating light toward the back mold member while heating the mold assembly to a temperature of between about 200°

F. to about 225°

F., for a time of up to about 15 minutes.

30. A method for making a plastic eyeglass lens, comprising:

placing a liquid lens forming composition in a mold cavity defined by at least a front mold member and a back mold member, the lens forming composition comprising;

a monomer composition comprising an aromatic containing polyether polyethylenic functional monomer;

a co-initiator composition, the co-initiator composition comprising an amine; and

a photoinitiator; and

substantially simultaneously directing light toward at least one of the mold members and heat toward both of the mold members to form the eyeglass lens.

31. The method of claim 30, wherein the aromatic containing polyethylenic polyether functional monomer comprises an ethoxylated bisphenol A containing at least one group selected from acrylyl or methacrylyl.

32. The method of claim 30, wherein the co-initiator composition comprises an acrylyl amine.

33. The method of claim 32, wherein the acrylyl amine is selected from the group consisting of monoacrylated amines, diacrylated amines, or mixtures thereof.

34. The method of claim 30, wherein the lens forming composition further comprises a photochromic compound.

35. The method of claim 30, wherein the lens forming composition further comprises an ultraviolet absorbing compound for inhibiting at least a portion of ultraviolet light from being transmitted through the eyeglass lens during use.

36. The method of claim 30, wherein treating the lens forming composition with activating light and heat comprises directing activating light toward both of the mold members.

37. The method of claim 30, wherein treating the lens forming composition with activating light and heat comprises initially directing activating light toward the bottom mold member and subsequently directing activating light toward both mold members.

38. The method of claim 30, wherein treating the lens forming composition with activating light and heat comprises directing activating light toward at least one of the mold members and applying heat to both mold members for a time of up to about 15 minutes

39. The method of claim 30, further comprising applying heat to the lens in the absence of activating light, subsequent to directing activating light and heat toward at least one of the mold members.

40. The method of claim 30, further comprising heating the lens forming composition prior to placing the lens forming composition in a mold cavity.

41. The method of claim 30, further comprising removing the eyeglass lens from the mold cavity and applying an abrasion resistant coating to a front surface of the eyeglass lens.

42. The method of claim 30, further comprising removing the eyeglass lens from the mold cavity and tinting the eyeglass lens.

43. The method of claim 30, wherein the lens forming composition exhibits a yellow color after the curing is initiated, and wherein activating light and heat are directed toward the lens until the lens forming composition is substantially free of the yellow color.

44. The method of claim 30, wherein the eyeglass lens is an aspheric single vision lens.

45. The method of claim 30, wherein the eyeglass lens is a flat-top bifocal lens.

46. The method of claim 30, wherein the eyeglass lens is a progressive multifocal lens.

47. The method of claim 30, wherein the eyeglass lens is an aspheric single vision lens, a flat-top bifocal lens or a progressive multifocal lens.

48. The method of claim 30, wherein the eyeglass lens is a flat-top bifocal lens and wherein directing activating light toward at least one of the mold members to initiate curing comprises directing activating light toward the front mold member prior to directing activating light toward the back mold member.

49. The method of claim 30, wherein the eyeglass is a flat top bifocal lens, the flat-top bifocal lens comprising a near vision correction zone and a far vision correction zone, and wherein directing activating light toward at least one of the mold members to initiate curing comprises directing activating light toward the back mold member prior to directing activating light toward the front mold member, and further comprising directing activating light toward the front mold member before the lens forming composition in the far vision correction zone proximate the front mold member is substantially gelled.

50. The method of claim 30, wherein the eyeglass lens is a non-photochromic lens, and wherein directing activating light toward at least one of the mold members to initiate curing comprises directing activating light toward both mold members for a time of less than about 2 minutes, and wherein directing activating light and heat toward at least one of the mold members comprises directing activating light toward the back mold member while heating the mold assembly to a temperature of between about 200°

F. to about 225°

F. for a time of up to about 15 minutes.

51. The method of claim 30, wherein the eyeglass lens is a non-photochromic lens, and wherein directing activating light toward at least one of the mold members to initiate curing comprises directing activating light toward the front mold member for a time of less than about 10 seconds, and wherein directing activating light and heat toward at least one of the mold members comprises directing activating light toward the back mold member while heating the mold assembly to a temperature of between about 200°

F. to about 225°

F., for a time of up to about 15 minutes.

52. The method of claim 30, wherein the eyeglass lens is a photochromic lens, and wherein directing activating light toward at least one of the mold members to initiate curing comprises directing activating light toward both mold members for a time of less than about 2 minutes, and wherein directing activating light and heat toward at least one of the mold members comprises directing activating light toward the back mold member while heating the mold assembly to a temperature of between about 200°

F. to about 225°

F., for a time of up to about 15 minutes.

53. The method of claim 30, wherein the eyeglass lens is a photochromic lens, and wherein directing activating light toward at least one of the mold members to initiate curing comprises directing activating light toward the front mold member for a time of less than about 25 seconds, and wherein directing activating light and heat toward at least one of the mold members comprises directing activating light toward the back mold member while heating the mold assembly to a temperature of between about 200°

F. to about 225°

F., for a time of up to about 15 minutes.

54. The method of claim 30, wherein the eyeglass lens is a photochromic lens, and wherein directing activating light toward at least one of the mold members to initiate curing comprises directing first activating light toward the back mold member for a time of less than about 25 seconds and further comprising directing second activating light toward the front mold member for a time period of less than about 10 seconds after the directing of the first activating light is started, and wherein directing activating light and heat toward at least one of the mold members comprises directing activating light toward the back mold member while heating the mold assembly to a temperature of between about 200°

F. to about 225°

F., for a time of up to about 15 minutes.

55. A method for making a flat-top bifocal eyeglass lens, the flat top bifocal eyeglass lens comprising a near vision correction zone and a far vision correction zone, comprising:

placing a liquid lens forming composition in a mold cavity of a mold assembly, wherein the mold assembly comprises a front mold member and a back mold member, the front mold member comprising a near vision correction zone;

directing activating light toward at least one of the mold members to initiate curing of the lens forming composition, wherein the curing is initiated such that the lens forming composition in the near vision correction zone of the front mold is substantially gelled before the lens forming composition in the far vision correction zone proximate the front mold member is substantially gelled; and

directing activating light and heat toward at least one of the mold members subsequent to initiating curing of the lens to form the eyeglass lens.

56. The method of claim 55, wherein directing activating light toward at least one of the mold members to initiate curing comprises directing activating light toward the front mold member prior to directing activating light toward the back mold member.

57. The method of claim 55, directing activating light toward at least one of the mold members to initiate curing comprises directing activating light toward the back mold member prior to directing activating light toward the front mold member, and further comprising directing activating light toward the front mold member before the lens forming composition in the far vision correction zone proximate the front mold member is substantially gelled.

58. The method of claim 55, wherein the lens forming composition comprises:

a monomer composition comprising an aromatic containing polyether polyethylenic functional monomer;

a co-initiator composition, wherein the co-initiator composition activates curing of the monomer composition to form the eyeglass lens during curing of the lens forming composition, the co-initiator composition comprising an amine; and

a photoinitiator, wherein the photoinitiator activates the co-initiator composition in response to being exposed to activating light during curing of the lens forming composition.

59. The method of claim 58, wherein the aromatic containing polyethylenic polyether functional monomer comprises an ethoxylated bisphenol A containing at least one group selected from acrylyl or methacrylyl.

60. The method of claim 58, wherein the co-initiator composition comprises an acrylyl amine.

61. The method of claim 60, wherein the co-initiator composition comprises an acrylyl amine, wherein the acrylyl amine is selected from the group consisting of monoacrylated amines, diacrylated amines, or mixtures thereof.

62. The method of claim 58, wherein the lens forming composition further comprises a photochromic compound.

63. The method of claim 58, wherein the lens forming composition further comprises an ultraviolet absorbing compound for inhibiting at least a portion of ultraviolet light from being transmitted through the eyeglass lens during use.

64. The method of claim 55, wherein curing of the lens forming composition is initiated by directing activating light toward at least one of the mold members for less than 30 seconds.

65. The method of claim 55, wherein curing of the lens forming composition is initiated by directing activating light toward at least one of the mold members for less than 100 seconds.

66. The method of claim 55, wherein curing of the lens forming composition is initiated by directing activating light toward both of the mold members.

67. The method of claim 55, wherein curing of the lens forming composition is initiated by directing activating light toward the bottom mold member.

68. The method of claim 55, wherein treating the lens forming composition with activating light and heat comprises directing activating light toward at least one of the mold members and applying heat to both mold members for a time of up to about 15 minutes.

69. The method of claim 55, further comprising applying heat to the lens in the absence of activating light, subsequent to directing activating light and heat toward at least one of the mold members.

70. The method of claim 55, further comprising heating the lens forming composition prior to placing the lens forming composition in a mold cavity.

71. The method of claim 55, further comprising removing the eyeglass lens from the mold cavity and applying an abrasion resistant coating to a front surface of the eyeglass lens.

72. The method of claim 55, further comprising removing the eyeglass lens from the mold cavity and tinting the eyeglass lens.

73. The method of claim 55, wherein the lens forming composition exhibits a yellow color after the curing is initiated, and wherein activating light and heat are directed toward the lens until the lens forming composition is substantially free of the yellow color.

74. The method of claim 55, wherein directing activating light toward at least one of the mold members to initiate curing is performed in a curing chamber, and wherein directing activating light and heat toward at least one of the mold members subsequent to initiating curing is performed in a post-cure chamber, and further comprising transferring the mold assembly to the post-cure chamber after the curing is initiated in the curing chamber.

75. The method of claim 55, wherein directing activating light toward at least one of the mold members is preformed without cooling of the mold assembly.