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GB636379A - Production of shaped optical elements - Google Patents

Production of shaped optical elements

Info

Publication number
GB636379A
GB636379A GB6421/48A GB642148A GB636379A GB 636379 A GB636379 A GB 636379A GB 6421/48 A GB6421/48 A GB 6421/48A GB 642148 A GB642148 A GB 642148A GB 636379 A GB636379 A GB 636379A
Authority
GB
United Kingdom
Prior art keywords
alpha
light
alpha1
methyl
benzoin
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
GB6421/48A
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.)
Imperial Chemical Industries Ltd
ALAN WHITE Co
Original Assignee
Imperial Chemical Industries Ltd
ALAN WHITE Co
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
Priority to GB21260/46A priority Critical patent/GB618787A/en
Priority to FR952308D priority patent/FR952308A/en
Application filed by Imperial Chemical Industries Ltd, ALAN WHITE Co filed Critical Imperial Chemical Industries Ltd
Priority to GB6421/48A priority patent/GB636379A/en
Publication of GB636379A publication Critical patent/GB636379A/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
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0888—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using transparant moulds
    • B29C35/0894—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using transparant moulds provided with masks or diaphragms
    • 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
    • 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
    • B29D11/00038—Production of contact lenses
    • B29D11/00125—Auxiliary operations, e.g. removing oxygen from the mould, conveying moulds from a storage to the production line in an inert atmosphere
    • B29D11/00134—Curing of the contact lens material
    • B29D11/00153—Differential curing, e.g. by differential radiation
    • B29D11/00163—Movable masks or shutters, e.g. to vary the exposure
    • 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
    • B29D11/00442—Curing the lens material
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0002—Condition, form or state of moulded material or of the material to be shaped monomers or prepolymers
    • 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
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/0026—Transparent

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Ophthalmology & Optometry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Toxicology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Thermal Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Abstract

Shaped optical elements or preforms having an axis of reference such that the thickness of the element measured parallel to said axis at all points in the element at a given distance from said axis is substantially constant are made by subjecting a transparent photopolymerizable liquid monomeric compound possessing the group >C=C< in the molecule, or a liquid partial polymer derived therefrom to the polymerizing action of light in a mould of the desired shape until a solid body is formed, the average intensity of light falling upon the monomeric compound or partial polymer being such that Q/t is constant, Q being the average quantity of light falling per unit time per unit area, measured at right angles to the direction of the incident light, upon the monomeric compound or partial polymer, and t being the thickness of the material undergoing polymerization, measured in the direction of the incident light. The light control is obtained by interposing between the mould a screen from which portions calculated mathematically in accordance with the above requirement have been cut or a suitable prepared photographic filter or a pigmented transparent screen. The screen and/or the mould may be rotated. The monomeric compounds specified are acrylic and methacrylic acids, methyl methacrylate, cyclohexyl methacrylate, 2,2,2-trifluoroethyl methacrylate, styrene, vinyl acetate, allyl methacrylate and diallyl fumarate. Mixtures of two or more of the monomeric compounds may be used. The composition preferably comprises a polymeric material of low molecular weight dissolved in the monomeric compound or compounds. The term "light" means all light from infra-red to ultra-violet. The photo-polymerization catalysts specified are glycollic aldehyde, benzoin, acetoin, butyroin, 3-hydroxy-4-methyl-pentanone-2, toluin, tert.-butylbenzoin, 12-hydroxy-13-ketotetracosane, o- and p-tert.-butyltoluin, benzoin methyl ether, benzoin ethyl ether, benzoin propyl ether, pivaloin ethyl ether, anisoin methyl ether, diacetyl, pentanedione-2,3; octanedione-2,3; 1-phenyl butanedione-1,2; benzil; 2,2-dimethyl-4-phenylbutanedione-3,4; glyoxal, phenyl-glyoxal, diphenyl triketone; 1,2-cyclohexanedione, alpha, alpha1-azodiisobutyronitrile, alpha, alpha1-azobis-(alpha-gamma-dimethylvaleronitrile); dimethyl and diethyl alpha, alpha1-azodiisobutyrates; alpha, alpha1-azo-bis-(alpha-methyl- or ethylbutyronitrile); and alpha, alpha1-azodiisobutyro-carbonamide. The photopolymerization catalysts may be used in conjunction with a peroxide catalyst such as benzoyl, lauryl, acetyl, butyroyl, succinyl peroxides and ascaridole. Specification 636,283 is referred to.
GB6421/48A 1946-07-16 1948-03-01 Production of shaped optical elements Expired GB636379A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB21260/46A GB618787A (en) 1946-07-16 1946-07-16 Production of optical elements
FR952308D FR952308A (en) 1946-07-16 1947-08-25 Manufacture of optical elements
GB6421/48A GB636379A (en) 1946-07-16 1948-03-01 Production of shaped optical elements

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB21260/46A GB618787A (en) 1946-07-16 1946-07-16 Production of optical elements
GB6421/48A GB636379A (en) 1946-07-16 1948-03-01 Production of shaped optical elements

Publications (1)

Publication Number Publication Date
GB636379A true GB636379A (en) 1950-04-26

Family

ID=37907658

Family Applications (2)

Application Number Title Priority Date Filing Date
GB21260/46A Expired GB618787A (en) 1946-07-16 1946-07-16 Production of optical elements
GB6421/48A Expired GB636379A (en) 1946-07-16 1948-03-01 Production of shaped optical elements

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB21260/46A Expired GB618787A (en) 1946-07-16 1946-07-16 Production of optical elements

Country Status (2)

Country Link
FR (1) FR952308A (en)
GB (2) GB618787A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2561401A1 (en) * 1984-03-16 1985-09-20 Ceskoslovenska Akademie Ved PROCESS FOR THE POLYMERIZATION OF MIXTURES OF MONOMERS FOR THE PRODUCTION OF CONTACT LENSES BY CENTRIFUGAL MOLDING
FR2657294A1 (en) * 1990-01-22 1991-07-26 Essilor Int Method for the manufacture of an artificial optical lens, and corresponding artificial optical lens
EP0439394A2 (en) * 1990-01-22 1991-07-31 ESSILOR INTERNATIONAL Compagnie Générale d'Optique Process for the production of an artificial ophthalmic lens, and corresponding artificial ophthalmic lens
FR2669265A2 (en) * 1990-11-16 1992-05-22 Essilor Int Method for the manufacture of an artificial optical lens, and corresponding artificial optical lens

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4166088A (en) * 1977-05-25 1979-08-28 Neefe Charles W Method of making high quality plastic lenses
KR20000057678A (en) * 1996-12-20 2000-09-25 워필드 마크 Polymeric processing system for producing ophthalmic lenses

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2561401A1 (en) * 1984-03-16 1985-09-20 Ceskoslovenska Akademie Ved PROCESS FOR THE POLYMERIZATION OF MIXTURES OF MONOMERS FOR THE PRODUCTION OF CONTACT LENSES BY CENTRIFUGAL MOLDING
GB2155940A (en) * 1984-03-16 1985-10-02 Ceskoslovenska Akademie Ved Method for the polymerization of monomer mixtures in the production of contact lenses by centrifugal casting
FR2657294A1 (en) * 1990-01-22 1991-07-26 Essilor Int Method for the manufacture of an artificial optical lens, and corresponding artificial optical lens
EP0439394A2 (en) * 1990-01-22 1991-07-31 ESSILOR INTERNATIONAL Compagnie Générale d'Optique Process for the production of an artificial ophthalmic lens, and corresponding artificial ophthalmic lens
EP0439394A3 (en) * 1990-01-22 1991-10-16 Essilor International, Cie Generale D'optique Process for the production of an artificial ophthalmic lens, and corresponding artificial ophthalmic lens
US5172143A (en) * 1990-01-22 1992-12-15 Essilor International Cie Generale D'optique Artificial optical lens and method of manufacturing it
FR2669265A2 (en) * 1990-11-16 1992-05-22 Essilor Int Method for the manufacture of an artificial optical lens, and corresponding artificial optical lens

Also Published As

Publication number Publication date
GB618787A (en) 1949-02-28
FR952308A (en) 1949-11-15

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