Phosphonium borohydride compound and process for producing polyc

Details Phosphonium borohydride compound and process for producing polyc Phosphonium borohydride compound and process for producing polyc

1997-06-25

1998-12-29

Mosley, Terressa

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528198, 558268, C08G 6400

Patent

active

058543740

ABSTRACT:
A process for producing a polycarbonate including melt polycondensing an aromatic dihydroxy compound and a carbonic acid diester in the presence of a phosphonium borohydride catalyst(I), ##STR1## wherein R is a straight-chain or branched alkyl group, or ##STR2## wherein each of R.sub.1, R.sub.2, and R.sub.3, independently is a C.sub.1 .about.C.sub.4 alkyl group. A colorless, transparent polycarbonate having a high molecular weight is obtained by using the phosphonium borohydride compound (I) as a transesterification catalyst, which may be used alone or incorporated with boric acid or a hindered phenol antioxidant.

REFERENCES:
patent: 5221761 (1993-06-01), Jen
patent: 5432250 (1995-07-01), Yamato et al.

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