Polycarbonate for disc substrate having low bisphenol content

Details Polycarbonate for disc substrate having low bisphenol content Polycarbonate for disc substrate having low bisphenol content

1988-05-09

1989-11-14

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528493, C08G 6362

Patent

active

048808962

ABSTRACT:
Polycarbonate for production of disc substrates, a process for efficiently producing said polycarbonate, and a disc substrate made of said polycarbonate are disclosed. This polycarbonate has a low molecular weight polymer content of not more than 3% by weight, an unreacted bisphenol content of not more than 20 ppm, and a methylene chloride content of not more than 20 ppm, and can be obtained by extracting impurity-containing powdery polycarbonate with an organic solvent such as acetone and methyl ethyl ketone. This polycarbonate is particularly suitable for production of high quality disc substrates.

REFERENCES:
patent: 4680374 (1987-07-01), Hasuo et al.
patent: 4734488 (1988-03-01), Hasuo et al.

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