Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1996-01-24
1997-12-30
Merriam, Andrew E. C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523106, 524540, 524588, 525534, 525431, 528 86, 351159, G02C 702
Patent
active
057031436
ABSTRACT:
A transparent ocular lens material comprising a silicon-containing polymer having a recurring unit represented by the general formula (I): ##STR1## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 is independently hydrogen atom, an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms or a group represented by the general formula (lI): ##STR2## in which each of R.sup.5, R.sup.6 and R.sup.7 is independently an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms or phenyl group. The ocular lens material has excellent transparency, high oxygen permeability and heat resistance, and excellent ultraviolet-ray absorbing properties and forming and processing properties, and has a relatively high refractive index.
REFERENCES:
patent: 4859719 (1989-08-01), Ofstead
patent: 5487920 (1996-01-01), Lopata et al.
patent: 5504158 (1996-04-01), Akkapeddi et al.
patent: 5543442 (1996-08-01), Hiratani et al.
Database WPI, Derwent Publication Ltd., London, GB; AN 90-344037 and JP-A-02 247 249 (Sumitomo Chem. Ind. KK.) Oct. 3, 1990 (Abstract).
Database WPI, Derwent Publications Ltd., London, GB; AN 92-230606 and JP-A-04 154 826 (Japan Synthetic Rubber Co., Ltd.) May 27, 1992 (Abstract) .
Hiratani Haruyuki
Ichinohe Shoji
Nakada Kazuhiko
Yamazaki Toshio
Menicon Co. Ltd.
Merriam Andrew E. C.
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