Lens comprising a polycarbonate formed by an interfacial polycon

Details Lens comprising a polycarbonate formed by an interfacial polycon Lens comprising a polycarbonate formed by an interfacial polycon

1993-02-04

1994-10-04

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528196, C08G 6400

Patent

active

053527593

ABSTRACT:
There is provided a polycarbonate lens having improved transmittance of light with a wavelength of 400 nm. This lens is made of a polycarbonate derived from 1,1-bis(4-hydroxyphenyl)-1-phenylethane, specific viscosity found from a solution of 0.7 g of said polycarbonate in 100 ml of methylene chloride being 0.176 to 0.295, and transmittance of light with a wavelength of 400 nm passing through a 3 mm thick member molded from said polycarbonate being 80% or more.

REFERENCES:
patent: 4020045 (1977-04-01), Baggett
patent: 4108827 (1978-08-01), LaLiberte
patent: 4139694 (1979-02-01), LaLiberte
patent: 4495345 (1985-01-01), Kawakami et al.
patent: 4880896 (1989-11-01), Otsubo et al.
Handbook of Chemistry, Lange, Eighth Edition, 1952, p. 266.
Hack's Chemical Dictionary, Fourth Ed., McGraw-Hill, New York, Jun. 1969, p. 515.
The Merck Index, Eleventh Edition, Merck and Co., Inc., Jun. 1989, p. 1167.

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