Industrial production of cast plastic lenses

Details Industrial production of cast plastic lenses Industrial production of cast plastic lenses

C - Chemistry, Metallurgy

08

L

18/104, 400/5334

C08L 31/00 (2006.01) B29D 11/00 (2006.01) C08F 18/24 (2006.01) C08K 5/54 (2006.01) C08L 83/00 (2006.01) G02B 1/04 (2006.01)

Patent

CA 1098635

Abstract of the Disclosure The process of the preparation of production quantities of lens devices fabricated from synthetic resinous substances, normally referred to as "plastic lenses". The process utilizes a molding formulation which enables re-usable mold cavities to be utilized, the formulation providing a proper balance between a number of processing parameters or variables, one of the primary parameters being the maintenance of a proper adherence or re- lease capability between the surface of the lens being fabricated and the surface of the mold cavity. Specifically, it has been found that a silane selected from the group consisting of: Vinyltrichlorosilane Vinyltriacetoxysilane gamma-Glycidoxypropyltriethoxysilane Vinyltriethoxysilane gamma-methacryloxypropyltrimethoxysilane beta (3,4-Epoxycylohexyl)-ethyltrimethoxysilane Methylvinyldichlorosilane Vinyl-tris (beta-methoxyethoxy) silane Vinyltrimethoxysilane gamma-Aminopropyltriethoxysilane N-beta-(aminoethyl)-gamma aminopropyltrimethoxysilane when incorporated in the molding formulation controls the parameters so as to provide for controllable release of the lens product from the mold.

255947

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