GB1317006A - Double replication process for producing ophthalmic lenses - Google Patents

Double replication process for producing ophthalmic lenses

Info

Publication number
GB1317006A
GB1317006A GB3273570A GB3273570A GB1317006A GB 1317006 A GB1317006 A GB 1317006A GB 3273570 A GB3273570 A GB 3273570A GB 3273570 A GB3273570 A GB 3273570A GB 1317006 A GB1317006 A GB 1317006A
Authority
GB
United Kingdom
Prior art keywords
casting
resin
glycol dimethacrylate
ophthalmic lenses
divinylbenzene
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3273570A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beattie Lab Inc J O
Original Assignee
Beattie Lab Inc J O
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beattie Lab Inc J O filed Critical Beattie Lab Inc J O
Publication of GB1317006A publication Critical patent/GB1317006A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/0048—Moulds for lenses
    • B29D11/00519—Reusable moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/00432—Auxiliary operations, e.g. machines for filling the moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/0048—Moulds for lenses
    • B29D11/00528—Consisting of two mould halves joined by an annular gasket
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G02B1/041—Lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/10—Thermosetting resins

Abstract

1317006 Casting ophthalmic lenses and moulds therefor J O BEATTIE LABORATORIES INC 6 July 1970 [15 July 1969] 32735/70 Heading B5A Ophthalmic lenses are produced by (i) casting a first resin against a glass negative; (ii) casting a second resin against the positive produced from (i); and (iii) casting an optically clear thermosetting plastic e.g. poly(diethylene glycol bis-allyl carbonate) against the negative from (ii). The first resin may be a copolymer of 70% acrylonitrile and 30% methyl methacrylate, preferably crosslinked with 5-30% glycol dimethacrylate. The second resin may be a copolymer of (a) 96-50% methyl methacrylate with 4-50% of glycol dimethacrylate, divinylbenzene or acrylonitrile, (b) 96-50% styrene with 4-50% glycol dimethacrylate or divinylbenzene or (c) 10-90% styrene with 90-10% acrylonitrile crosslinked with 5-50% glycol dimethacrylate or divinylbenzene. A flexible membrane is preferably used in stages (i) and (ii) to accommodate shrinkage of the resin, the casting in these stages preferably being effected at a pressure of 50 lb/in<SP>2</SP>. The lens may have a raised focal segment portion.
GB3273570A 1969-07-15 1970-07-06 Double replication process for producing ophthalmic lenses Expired GB1317006A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US84191669A 1969-07-15 1969-07-15

Publications (1)

Publication Number Publication Date
GB1317006A true GB1317006A (en) 1973-05-16

Family

ID=25286036

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3273570A Expired GB1317006A (en) 1969-07-15 1970-07-06 Double replication process for producing ophthalmic lenses

Country Status (4)

Country Link
BE (1) BE753438A (en)
DE (1) DE2029119A1 (en)
FR (1) FR2055088A5 (en)
GB (1) GB1317006A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2213424A (en) * 1987-12-28 1989-08-16 Sony Corp A method of producing a resin mould.
GB2226272A (en) * 1988-11-02 1990-06-27 Nat Res Dev Contact lens cast moulding and packaging
US5573108A (en) * 1988-11-02 1996-11-12 British Technology Group Ltd. Disposable contact lens package

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2213424A (en) * 1987-12-28 1989-08-16 Sony Corp A method of producing a resin mould.
US4948537A (en) * 1987-12-28 1990-08-14 Sony Corporation Method of producing a resin mold for rear projection screen
GB2213424B (en) * 1987-12-28 1992-02-19 Sony Corp A method of producing a resin mould
GB2226272A (en) * 1988-11-02 1990-06-27 Nat Res Dev Contact lens cast moulding and packaging
US5143660A (en) * 1988-11-02 1992-09-01 National Research Development Corporation Method of casting a contact lens
GB2226272B (en) * 1988-11-02 1993-01-13 Nat Res Dev Contact lens cast moulding and packaging
US5573108A (en) * 1988-11-02 1996-11-12 British Technology Group Ltd. Disposable contact lens package
US5578332A (en) * 1988-11-02 1996-11-26 British Technology Group Ltd. Contact lens mould

Also Published As

Publication number Publication date
BE753438A (en) 1971-01-14
DE2029119A1 (en) 1971-01-28
FR2055088A5 (en) 1971-05-07

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees