US3830460A
Expired / Lapsed
US
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Polymeric replica molds and replication processes for producing plastic optical components
Assignee: Beattie Developments Co
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Filing: 1971-12-21
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Granted: 1974-08-20
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Expires: 1991-12-21
Abstract
Abstract Polymeric replica molds formed from certain specific polymeric compositions are disclosed. The polymeric compositions impart properties to the replica molds which allow the casting of highquality plastic optical components such as ophthalmic lenses. Among the polymeric compositions which have been found useful are: (1) cross-linked polymethyl methacrylate; (2) a copolymer of 99-20 parts methyl methacrylate and 1-80 parts acrylonitrile, preferably but not necessarily cross-linked; (3) cross-linked polystyrene; (4) a cross-linked copolymer of 90-10 parts styrene and 10-90 parts acrylonitrile; and, (5) a cross-linked copolymer of 90-10 parts styrene and 10-90 parts methyl methacrylate. Replication processes including the steps of forming the polymeric replica molds described herein and subsequently using them in the casting of plastic lenses from materials such as polymerized allyl diglycol carbonate are also disclosed.
Inventors
- 👤 J Beattie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:11
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; B29D11/0048; B29D11/00519; B29C; B29C33/00; B29C33/38; B29C33/40; B29C33/405; B29D11/00038; B29D11/00125; B29D11/00192; B29D11/00413; B29D11/00528; B29D11/0074; B29D11/00855; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; Y; Y10; Y10S; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
43 words
A replica mold of claim 1 wherein the entire mold is formed from said polymeric composition, the mold has a thickness of from about 6 to about 15 millimeters, and the polymeric composition has a flexural modulus above about 3.5 X 105 psi.
Claim 2
Dependent Claim
15 words
A replica mold of claim 2 wherein said plastic optical element comprises an ophthalmic lens.
Claim 3
Dependent Claim
18 words
A replica mold of claim 3 wherein said polymeric composition is releasable from a glass master mold surface.
Claim 4
Dependent Claim
158 words
A replica mold of claim 4 wherein said replica mold is formed from a polymeric composition comprising a member selected from the group consisting of: a. polymethyl methacrylate cross-linked with a minor amount of a cross-linking agent; b. a copolymer formed from about 99 to about 20 parts of methyl methacrylate and about 1 to about 80 parts of acrylonitrile, said copolymer being cross-linked with from 0 to a minor amount of a cross-linking agent; c. polystyrene cross-linked with a minor amount of a cross-linking agent; d. a copolymer formed from about 90 to about 10 parts of styrene and from about 10 to about 90 parts of acrylonitrile, said copolymer being cross-linked with a minor amount of a cross-linking agent; and, e. a copolymer formed from about 90 to about 10 parts of styrene and from about 10 to about 90 parts of methyl methacrylate, said copolymer being cross-linked with a minor amount of a cross-linking agent.
Claim 5
Dependent Claim
25 words
A replica mold of claim 5 wherein said polymeric composition comprises polystyrene cross-linked with from about 1 to about 20 percent of a cross-linking agent.
Claim 6
Dependent Claim
13 words
A replica molD of claim 6 wherein said cross-linking agent comprises glycol dimethacrylate.
Claim 7
Dependent Claim
52 words
A replica mold of claim 5 wherein said polymeric composition is a copolymer comprising from about 65 parts to about 25 parts of methyl methacrylate and from about 35 parts to about 75 parts of acrylonitrile, said copolymer being cross-linked with from about 5 to about 30 percent of a cross-linking agent.
Claim 8
Dependent Claim
13 words
A replica mold of claim 8 wherein said cross-linking agent comprises glycol dimethacrylate.
Claim 9
Dependent Claim
39 words
A replica mold of claim 5 wherein said polymeric composition is a copolymer comprising about 30 parts methyl methacrylate and about 70 parts acrylonitrile, said copolymer being cross-linked with from about 5 to about 30 percent of glycol dimethacrylate.
Claim 10
Dependent Claim
182 words
An ophthalmic replica mold having a surface configuration negative to that of a master mold, said replica mold being formed from a polymeric composition comprising a member selected from the group consisting of: a. polymethyl methacrylate cross-linked with from about 5 to about 30 percent of a cross-linking agent; b. a copolymer formed from about 65 to about 25 parts of methyl methacrylate and from about 35 to about 75 parts of acrylonitrile, said copolymer being cross-linked with from about 5 to about 30 percent of a cross-linking agent; c. polystyrene cross-linked with from about 1 to about 20% of a cross-linking agent; d. a copolymer formed from about 80 to about 60 parts of styrene and from abour 20 to about 40 parts of acrylonitrile, said copolymer being cross-linked with from about 5 to about 20 percent of a cross-linking agent; and, e. a copolymer formed from about 80 to about 30 parts styrene and from about 20 to about 70 parts of methyl methacrylate said copolymer being cross-linked with from about 10 to about 20 percent of a cross-linking agent.
Claim 11
Dependent Claim
25 words
An ophthalmic replica mold of claim 11 wherein said polymeric composition comprises polystyrene cross-linked with from about 1 to about 20 percent of glycol dimethacrylate.
Claim 12
Dependent Claim
39 words
An ophthalmic replica mold of claim 11 wherein said polymeric composition is a copolymer comprising about 30 parts methyl methacrylate and about 70 parts acrylonitrile, said copolymer being cross-linked with from about 5 to about 30% of glycol dimethacrylate.
Claim 13
Dependent Claim
101 words
A replica mold for producing a polymerized allyl diglycol carbonate lens having a predetermined ophthalmic surface configuration from a master mold surface, said replica mold having a surface configuration negative to said lens surface configuration and said replica mold comprising a polymeric composition which is releasable from said master mold surface, has balanced adhesion to the lens during cure thereof, is resistant to solvent attack by allyl diglycol carbonate during polymerization thereof, is thermally stable at the molding temperature, is capable of forming an ophthalmic quality surface on the lens, and has a flexural modulus above about 3.5 X 105 psi.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |