Patent EP0080908A1 successfully refreshed from Google Patents.
Patent US5249053A successfully refreshed from Google Patents.
US3673055A
Expired / Lapsed
US
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Laminated transparent bodies having mar resistant protective coatings
Assignee: Bausch and Lomb Inc
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Filing: 1970-03-30
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Granted: 1972-06-27
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Expires: 1990-03-30
Abstract
Abstract Transparent bodies, particularly ophthalmic lenses, having cores of super strong plastic, outer surface layers of abrasion resistant thermosetting resins such as the allyl and methacrylic esters and an intermediate later of a polyamide. The cores are of bisphenol-A polycarbonate, or of a clear, hetereogeneous blend known as ABS, which is a polyblend of three resins. The surface layer is polymerized in situ. The polyamide is selected from among those soluble in alcohol or a mixture of alcohol and hydrocarbons. It serves both as an adhesive to bond the surface layers securely to the cores and as a barrier agent to protect the cores from chemical attack by the monomer of the surface layer material. The surface layer is preferably cured in a mold which defines the shape and surface finish of the completed body.
Inventors
- 👤 Clarence A Sheld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:24
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; B29D11/0048; B29D11/00528; B29D11/00413; B29D11/0073; B29D11/00865; C; C08; C08J; C08J7/00; C08J7/04; C08J7/042; C08J7/043; C08J7/046; C08J2369/00; C08J2433/00; C08J2433/04; C08J2433/06; C08J2433/08; C08J2477/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31725; Y10T428/31728; Y10T428/31732; Y10T428/31736; Y10T428/31855; Y10T428/31909; Y10T428/31928
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
15 words
A transparent body according to claim 1 in which said core is of bisphenol-A polycarbonate.
Claim 2
Dependent Claim
57 words
A transparent body according to claim 1 in which said core consists essentially of a hetereogeneous blend Of a. a gel fraction consisting essentially of a polymer of styrene-acrylonitrile-methylmethacrylate grafted onto a preformed rubber of styrene-butadiene, b. a terpolymer of styrene-acrylonitrile-methylmethacrylate, and c. a styrene-butadiene polymer, said gel fraction constituting about 30 wgt. percent of said core.
Claim 3
Dependent Claim
43 words
A transparent body according to claim 1 in which said polyamide is selected from the group consisting of the solid thermoplastic fatty-acid polyamides and polyamidoamines derived from the condensation of dimerized vegetable acids with diamines or polyethylene polyamines, and mixtures and copolymers thereof.
Claim 4
Dependent Claim
28 words
A transparent body according to claim 1 in which said polyamide is an aliphatic copolyamide based on a combination of polycaprolactam, poly (hexamethylene adipamide), and poly (hexamethylene sebacamide).
Claim 5
Dependent Claim
20 words
A transparent body according to claim 1 in which said polyamide is a nylon derived from the polymerization of capryllactam.
Claim 6
Dependent Claim
21 words
A transparent body according to claim 1 in which said polyamide is an alkoxyalkyl substituted polyamide derived from poly (hexamethylene adipamide).
Claim 7
Dependent Claim
16 words
A transparent body according to claim 1 in which said surface layer is an allyl carbonate.
Claim 8
Dependent Claim
167 words
A transparent body having a core of super strong plastic, an outer surface layer about 0.001 inch to about 0.010 inch thick of an abrasion resistant thermosetting resin selected from the group consisting of allyl and methacrylic esters, and a bonding layer of a polyamide about 0.0001 inch to about 0.001 inch thick between said core and said outer surface layer, said polyamide being one that is soluble in a solvent that does not attack said core, is substantially impermeable in a thickness of about 0.0001 inch to 0.001 inch to the monomer of said thermosetting resin, and is selected from the group consisting of: a. the solid thermoplastic fatty acid polyamides and the polyamidoamines derived from the condensation of dimerized vegetable oil acids with diamines or polyethylene polyamines; b. aliphatic copolyamides based on combinations of polycaprolactam, poly (hexamethylene adipamide) and poly (hexamethylene sebacamide) in various proportions; c. nylons derived from the polymerization of capryllactam (Nylon 8); and d. alkoxyalkyl substituted polyamides derived from poly (hexamethylene adipamide).
Claim 9
Dependent Claim
167 words
A transparent body having a core of super strong plastic, an outer surface layer about 0.001 inch to about 0.002 inch thick of an abrasion resistant thermosetting resin selected from the group consisting of allyl and methacrylic esters, and a bonding layer of a polyamide about 0.0002 inch to about 0.0004 inch thick between said core and said outer surface layer, said polyamide being one that is soluble in a solvent that does not attack said core, is substantially impermeable in a thickness of about 0.0002 inch to 0.0004 inch to the monomer of said thermosetting resin, and is selected from the group consisting of: a. the solid thermoplastic fatty acid polyamides and the polyamidoamines derived from the condensation of dimerized vegetable oil acids with diamines or polyethylene polyamines; b. aliphatic copolyamides based on combinations of polycaprolactam, poly (hexamethylene adipamide) and poly (hexamethylene sebacamide) in various proportions; c. nylons derived from the polymerization of capryllactam (Nylon 8); and d. alkoxyalkyl substituted polyamides derived from poly (hexamethylene adipamide).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |