GB920609A - Improvements in or relating to the manufacture of lenses and the like - Google Patents

Improvements in or relating to the manufacture of lenses and the like

Info

Publication number
GB920609A
GB920609A GB2473160A GB2473160A GB920609A GB 920609 A GB920609 A GB 920609A GB 2473160 A GB2473160 A GB 2473160A GB 2473160 A GB2473160 A GB 2473160A GB 920609 A GB920609 A GB 920609A
Authority
GB
United Kingdom
Prior art keywords
final
dies
partially polymerized
moulded
catalyst
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
GB2473160A
Inventor
Samuel Robert Beech
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.)
Combined Optical Industries Ltd
Original Assignee
Combined Optical Industries Ltd
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 Combined Optical Industries Ltd filed Critical Combined Optical Industries Ltd
Priority to GB2473160A priority Critical patent/GB920609A/en
Publication of GB920609A publication Critical patent/GB920609A/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

Abstract

Polymerizable thermoplastic and thermosetting monomer is moulded with a catalyst &c. by casting between glass, steel or vacuum formed polyethylene dies to a partially polymerized and coherent form and subsequently moulded under pressure between accurately machined dies to final lens dimension and completed polymerization. Methyl methacrylate and alkyl methacrylate monomers in equal parts are mixed with 0,1% dibenzoyl peroxide catalyst, premoulded in an oven for successive periods at 50 DEG C., 60 DEG C., and 70 DEG C. respectively; followed by final pressing under 7 tons for 5 minutes at 200 DEG C. The preform may also be coated with partially polymerized resin or the upper preform surface may be mechanically formed prior to the final moulding. Specifications 556,743, 738,487, 796,867, 818,471 and 920,608 are referred to.
GB2473160A 1960-07-15 1960-07-15 Improvements in or relating to the manufacture of lenses and the like Expired GB920609A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2473160A GB920609A (en) 1960-07-15 1960-07-15 Improvements in or relating to the manufacture of lenses and the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2473160A GB920609A (en) 1960-07-15 1960-07-15 Improvements in or relating to the manufacture of lenses and the like

Publications (1)

Publication Number Publication Date
GB920609A true GB920609A (en) 1963-03-13

Family

ID=10216361

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2473160A Expired GB920609A (en) 1960-07-15 1960-07-15 Improvements in or relating to the manufacture of lenses and the like

Country Status (1)

Country Link
GB (1) GB920609A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2467679A1 (en) * 1979-10-25 1981-04-30 American Optical Corp IMPROVEMENTS ON LENSES IN CAST RESIN

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2467679A1 (en) * 1979-10-25 1981-04-30 American Optical Corp IMPROVEMENTS ON LENSES IN CAST RESIN

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