Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Organic polymerization
Reexamination Certificate
2007-04-17
2007-04-17
Bhat, N. (Department: 1764)
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Organic polymerization
C422S138000, C526S064000, C526S065000, C526S066000, C526S067000
Reexamination Certificate
active
09790539
ABSTRACT:
Polybutylene terephthalate having good heat stability and excellent hydrolysis resistance is continuously produced in a series of a first reactor for reacting an aromatic dicarboxylic acid comprising terephthalic acid as a main ingredient or a derivative thereof with a glycol comprising 1,4-butanediol as a main ingredient, thereby producing an oligomer with an average degree of polymerization of 2.2 to 5, a second reactor for polycondensating the oligomer from the first reactor, thereby preparing a low polymerization product with an average degree of polymerization of 25 to 40, and a third reactor for further polycondensating the low polymerization product from the second reactor, thereby producing a high molecular weight polyester with an average degree of polymerization of 70 to 130, or followed by a fourth reactor for further polycondensing the polyester from the third reactor to an average degree of polymerization of 150 to 200, thereby producing a high molecular weight polyester. Another third reactor or a plurality of third reactors can be provided in parallel to the third reactor, thereby producing different kinds of polybutylene phthalate with different degrees of polymerization from that produced in the main line of the third and fourth reactors or adjusting operating conditions of each of a plurality of the third reactors to increase kinds, precise quality.
REFERENCES:
patent: 4056514 (1977-11-01), Strehler et al.
patent: 4656241 (1987-04-01), Iida et al.
patent: 4680376 (1987-07-01), Heinze et al.
patent: 5304594 (1994-04-01), Saitou
patent: 6096838 (2000-08-01), Nakamoto et al.
patent: 6458916 (2002-10-01), Yamaguchi et al.
patent: 6590062 (2003-07-01), Yamaguchi et al.
patent: 6723826 (2004-04-01), Yamaguchi et al.
patent: 3544551 (1987-06-01), None
patent: 0 469 607 (1992-02-01), None
patent: 0 724 607 (1996-08-01), None
patent: 0 761 713 (1997-03-01), None
patent: 0 913 418 (1999-05-01), None
patent: 51-81897 (1976-07-01), None
patent: 52-51495 (1977-04-01), None
patent: WO 97/21754 (1997-06-01), None
German Official Action w/translation, dated Feb. 4, 2005, for 100 41 595.4-44 (7 pp. total).
Office Action, mailed Apr. 7, 2005, for U.S. Appl. No. 10/092,565.
Harada Susumu
Maeda Norifumi
Nakamoto Hidekazu
Yamaguchi Shuji
Antonelli, Terry Stout and Kraus, LLP.
Bhat N.
Hitachi , Ltd.
LandOfFree
Production apparatus for polybutylene terephthalate does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Production apparatus for polybutylene terephthalate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Production apparatus for polybutylene terephthalate will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3747604