Process for the production of copolycarbonates with reduced...

Details Process for the production of copolycarbonates with reduced... Process for the production of copolycarbonates with reduced...

2006-06-06

2006-06-06

Boykin, Terressa (Department: 1711)

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

C422S131000, C422S135000, C502S150000, C502S208000, C528S198000

Reexamination Certificate

active

07057004

ABSTRACT:
A method is provided for reducing the color generated during production of copolycarbonate that includes quinone-type residues. The method includes the steps preparing a reaction mixture containing precursors of monomer residues, selecting a catalyst introduction strategy and adding catalysts according to the strategy. The strategy is sufficient to result in a product copolycarbonate with improved color. The method further includes the steps of introducing the reaction mixture to a series of process units and allowing the reaction mixture to polymerize thereby forming a copolycarbonate. The resulting copolycarbonate has improved color as compared to a copolycarbonate formed in a process without the steps of selecting a catalyst introduction strategy and introducing catalysts according to the selected strategy.

REFERENCES:
patent: 4323668 (1982-04-01), Brunelle
patent: 5336751 (1994-08-01), Raymond, III
patent: 5384388 (1995-01-01), Sakashita et al.
patent: 5405933 (1995-04-01), Sakashita et al.
patent: 5418315 (1995-05-01), Sakashita
patent: 5418317 (1995-05-01), Raymond, III
patent: 5420192 (1995-05-01), Ishiwa et al.
patent: 5510450 (1996-04-01), Sakashita et al.
patent: 5565515 (1996-10-01), Ishiwa et al.
patent: 5602201 (1997-02-01), Fujiguchi et al.
patent: 5606009 (1997-02-01), Sakashita
patent: 5717056 (1998-02-01), Varadarajan et al.
patent: 6399739 (2002-06-01), McCloskey et al.
patent: 6420512 (2002-07-01), McCloskey et al.
patent: 6420588 (2002-07-01), McCloskey et al.
patent: 6469192 (2002-10-01), Burnell et al.
patent: 6500914 (2002-12-01), Brack et al.
patent: 6506871 (2003-01-01), Silvi et al.
patent: 6518391 (2003-02-01), McCloskey et al.
patent: 2002/0123603 (2002-09-01), Brack et al.
patent: 2002/0132957 (2002-09-01), Brack et al.
patent: 2003/0149223 (2003-08-01), McCloskey et al.
patent: 2004/0063825 (2004-04-01), Nagai et al.
patent: 0 508 774 (1992-10-01), None
patent: 0 508 775 (1992-10-01), None
patent: 0 663 425 (1995-07-01), None
patent: 0 849 305 (1998-06-01), None
patent: 0 849 305 (1998-06-01), None
patent: 6136109 (1994-05-01), None
patent: 6136112 (1994-05-01), None
patent: 6136113 (1994-05-01), None
patent: 6136248 (1994-05-01), None
patent: 6136252 (1994-05-01), None
patent: 7102154 (1995-04-01), None
patent: 7102161 (1995-04-01), None
patent: 7102165 (1995-04-01), None
patent: 7188539 (1995-07-01), None
patent: 7196871 (1995-08-01), None
patent: 7196872 (1995-08-01), None
patent: 7196873 (1995-08-01), None
patent: 7196906 (1995-08-01), None

Affiliated with

Also associated with

Rating

Process for the production of copolycarbonates with reduced... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the production of copolycarbonates with reduced..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production of copolycarbonates with reduced... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3672131