Polycarbonate-made optical article

Details Polycarbonate-made optical article Polycarbonate-made optical article

1988-08-11

1991-03-05

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528125, 528171, 528174, 528196, 528202, C08G 6414

Patent

active

049979035

ABSTRACT:
The invention provides an optical article, such as optical disc substrates and optical fibers, made of a polycarbonate resin suitable for manufacturing articles for optical applications in respect of the high mechanical strength, e.g., high impact strength, and low birefringence by virtue of the unique molecular structure having molecular chain ends stoppered with 4-cumyl phenol as the chain-terminal stopping agent in the polycondensation reaction of a dihydric phenol compound, e.g., bisphenol A, and phospgene along with a narrowly specified viscosity-average molecular weight in the range from 10,000 to 17,000.

REFERENCES:
patent: 4774315 (1988-09-01), Miller

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