OPHTHALMIC BLOCKING PAD

• US 20080274672A1
• Filed: 05/03/2007
• Published: 11/06/2008
• Est. Priority Date: 05/03/2007
• Status: Active Grant

• Current Assignee: Saint-Gobain Performance Plastics Corporation (Compagnie De Saint-Gobain)
• Original Assignee: Saint-Gobain Performance Plastics Corporation (Compagnie De Saint-Gobain)
• Inventors: Cole, Todd W., Therriault, Donald J.
• Granted Patent: US 7,935,402 B2
• Time in Patent Office: Days
• US Class Current: 451/41
• CPC Class Codes: B24B 13/005 Blocking means, chucks or the like; Alignment devices
• CPC Class Codes: B24B 9/146 Accessories, e.g. lens mounting devices
• CPC Class Codes: Y10T 428/14 Layer or component removable to expose adhesive
• CPC Class Codes: Y10T 428/249983 As outermost component
• CPC Class Codes: Y10T 428/28 Web or sheet containing structurally defined element or component and having an adhesive outermost layer
• CPC Class Codes: Y10T 428/2848 Three or more layers
• CPC Class Codes: Y10T 428/31551 Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
• CPC Class Codes: Y10T 428/31565 Next to polyester [polyethylene terephthalate, etc.]

Abstract

An ophthalmic blocking pad includes a foam layer, a film layer disposed over and directly contacting the foam layer, and an adhesive layer disposed over the film layer. The film layer has a tensile strength of at least about 25 ksi (172 MPa).

Claims

1. An ophthalmic blocking pad comprising:

a foam layer;

a film layer disposed over and directly contacting the foam layer, the film layer having a tensile strength of at least about 25 ksi (172 MPa); and

an adhesive layer disposed over the film layer.

2. The ophthalmic blocking pad of claim 1, wherein the adhesive layer includes an adhesive configured to bond to a low surface energy material.

3. The ophthalmic blocking pad of claim 2, wherein the adhesive exhibits a peel adhesion of at least about 4.0 lb/in (0.70 N/mm) on polypropylene.

7. The ophthalmic blocking pad of claim 1, further comprising a release liner disposed over the adhesive layer.

8. The ophthalmic blocking pad of claim 1, further comprising a second film layer disposed over a major surface of the foam layer opposite the film layer.

9. The ophthalmic blocking pad of claim 1, further comprising a second adhesive layer disposed over an opposite major surface of the foam layer from the adhesive layer.

11. The ophthalmic blocking pad of claim 1, wherein the film layer has an elongation-at-break of not greater than about 150%.

15. The ophthalmic blocking pad of claim 1, wherein the foam layer has a tensile strength of not greater than about 10 ksi (68 MPa).

17. The ophthalmic blocking pad of claim 1, wherein the foam layer has an elongation-at-break of at least about 200%.

21. The ophthalmic blocking pad of claim 1, wherein the foam layer has a force-to-compress of about 10 psi (68 kPa) to about 20 psi (137 kPa).

25. The ophthalmic blocking pad of claim 1, wherein the foam layer has a thickness in a range between about 20 mil (0.51 mm) and about 40 mil (1.0 mm).

27. The ophthalmic blocking pad of claim 1, wherein the film layer has a thickness in a range between about 0.1 mil (2.5 micron) and about 5.0 mil (127 micron).

29. The ophthalmic blocking pad of claim 1, wherein the adhesive layer has a thickness in a range between about 0.1 mil (2.5 micron) and about 5.0 mil (127 micron).

31. The ophthalmic blocking pad of claim 1, wherein the foam layer comprises polyurethane.

32. The ophthalmic blocking pad of claim 1, wherein the film layer comprises polyester.

34. The ophthalmic blocking pad of claim 1, wherein the adhesive layer comprises an adhesive selected from the group consisting of a silicone, an acrylic, a synthetic rubber, a natural rubber, and a copolymer, alloy, and combination thereof.

35. The ophthalmic blocking pad of claim 34, wherein the adhesive layer comprises an acrylic hybrid.

36. The ophthalmic blocking pad of claim 1, wherein ophthalmic blocking pad exhibits a Torque Performance of at least about 17 in-lb.

39. The ophthalmic blocking pad of claim 1, wherein the ophthalmic blocking pad exhibits a Peel Performance of at least about 1.0 N/cm.

42. The ophthalmic blocking pad of claim 1, wherein the ophthalmic blocking pad exhibits a Displacement Slope of at least about 0.95 in-lb/degree.

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46. An ophthalmic blocking pad comprising:

a foam layer having a specific gravity not greater than about 0.6;

a rigid film layer in direct contact with the foam layer, the rigid film layer having a tensile strength of at least about 25 ksi (172 MPa); and

an adhesive layer configured to exhibit a peel adhesion of at least about 4.0 lb/in (0.70 N/mm) on polypropylene.

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55. An ophthalmic blocking article comprising:

a first release liner forming a continuous sheet; and

a plurality of ophthalmic blocking structures disposed on the first release liner, each ophthalmic blocking structure of the plurality of blocking structures comprising;

a first adhesive layer in contact with the first release liner;

a foam layer disposed over the first adhesive layer;

a second adhesive layer disposed over the foam layer; and

a rigid film layer disposed between at least one of the first and second adhesive layers and the foam layer.

56. The ophthalmic blocking article of claim 55, further comprising a second release liner in contact with the second adhesive layer.