Optical articles of branched polycarbonate resin

Details Optical articles of branched polycarbonate resin Optical articles of branched polycarbonate resin

1985-04-10

1986-12-23

Pertilla, Theodore E.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528199, 528204, C08G 6362

Patent

active

046313346

ABSTRACT:
A transparent optical article is disclosed, which is produced by molding a branched polycarbonate resin having a viscosity average molecular weight of from 13,000 to 20,000 as prepared from at least one dihydric phenol compound in the presence of a polyfunctional organic compound having at least two phenolic hydroxyl groups as a branching agent in an amount of from 0.02 to 3 mol % based on the total amount of the dihydric phenol compound. The transparent molded optical article includes digital audio discs, video discs, memory discs and lenses used in the optical reading system. The optical article is greatly reduced in double refraction and has a high mechanical strength.

REFERENCES:
patent: 4185009 (1980-01-01), Idel et al.

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