Polycarbonate containing terminal hydroxy groups, low sodium and

Details Polycarbonate containing terminal hydroxy groups, low sodium and Polycarbonate containing terminal hydroxy groups, low sodium and

1992-06-19

1994-01-04

Anderson, Harold D.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528171, 528174, 528176, 528179, 528182, 528196, 528204, C08G 6404

Patent

active

052761290

ABSTRACT:
Disclosed herein are processes for the production of polycarbonates by melt polycondensation of an aromatic dihydroxy compound and a carbonic acid diester or a diphenyl carbonate compound wherein said polycondensation is carried out in the presence of from 0.05 to 15 mol %, based on 1 mole of the aromatic dihydroxy compound, of a phenol having from 10 to 40 carbon atoms, a carbonic acid diester having from 17 to 50 carbon atoms or a carbonic acid diester having from 13 to 16 carbon atoms, using a catalyst comprising (a) a nitrogen containing basic compound, (b) from 10.sup.-8 to 10.sup.-3 mole, based on 1 mole of the aromatic dihydroxy compound, of an alkali metal or alkaline earth metal compound, and (c) boric acid or boric ester. Also disclosed is a polycarbonate in which from 5 to 30% of its terminal groups are hydroxy groups and it has a sodium content of not more than 1 ppm and a chlorine content of not more than 20 ppm.

REFERENCES:
patent: Re27682 (1973-06-01), Schnell et al.
patent: Re31262 (1983-05-01), Brunelle
patent: 3177179 (1965-04-01), Lee et al.
patent: 3240756 (1966-03-01), Deanin et al.
patent: 3544514 (1970-12-01), Schnell et al.
patent: 3697481 (1972-10-01), Bialous et al.
patent: 4267303 (1981-05-01), Konig et al.
patent: 4269964 (1981-05-01), Freitag et al.
patent: 4330664 (1982-05-01), Brunelle
patent: 4469860 (1984-09-01), Rosenquist
patent: 4590257 (1986-05-01), Brunelle
patent: 4677184 (1987-06-01), Mark
patent: 4699971 (1987-10-01), Mark
patent: 4775739 (1988-10-01), Hasuo et al.
patent: 4788276 (1988-11-01), Mark et al.
patent: 4839458 (1989-06-01), Koga et al.
patent: 4880896 (1989-11-01), Otsubo et al.
patent: 4977233 (1990-12-01), Okamoto et al.
patent: 4997903 (1991-03-01), Okamoto
patent: 5151491 (1992-09-01), Sakashita et al.

Affiliated with

Also associated with

Rating

Polycarbonate containing terminal hydroxy groups, low sodium and does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Polycarbonate containing terminal hydroxy groups, low sodium and, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polycarbonate containing terminal hydroxy groups, low sodium and will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-308209