Interfacial method for preparing copolyestercarbonates

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

528176, 528179, 528198, 528199, 528202, C08G 6400

Patent

active

06117968&

ABSTRACT:
The level of anhydride linkages in copolyestercarbonates is decreased by preparing the copolyestercarbonate interfacially in a two-step method from at least one dihydroxyaromatic compound and at least one dicarboxylic acid. The first step is conducted at a pH in the range of about 4.5-9.5, employing the combination of a phase transfer catalyst such as a tetraalkylammonium halide and a tertiary amine such as triethylamine. The proportion of the phase transfer catalyst is in the range of about 3-12 mole percent based on total dihydroxyaromatic compound and dicarboxylic acid employed. In the second phosgenation step, the pH is raised to at least 10 and a stoichiometric phosgene excess of at least 5% is introduced.

REFERENCES:
patent: 5034527 (1991-07-01), Brown et al.
patent: 5262511 (1993-11-01), Caringi et al.
patent: 5274068 (1993-12-01), Boden et al.
patent: 5455323 (1995-10-01), Fontana et al.
patent: 5494997 (1996-02-01), Fontana et al.
patent: 5510449 (1996-04-01), Flowers et al.
patent: 5519105 (1996-05-01), Boden et al.
patent: 5807965 (1998-09-01), Davis et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Interfacial method for preparing copolyestercarbonates does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Interfacial method for preparing copolyestercarbonates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interfacial method for preparing copolyestercarbonates will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-97148

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.