Organic compounds -- part of the class 532-570 series – Organic compounds – Isocyanate esters
Reexamination Certificate
2011-07-12
2011-07-12
Sullivan, Daniel M (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Isocyanate esters
Reexamination Certificate
active
07977504
ABSTRACT:
An object of the present invention is to provide a process for producing isocyanates, which are industrially useful compounds, without using phosgene, and to provide a process for chemically recycling waste polycarbonate resin. The present invention discloses a process enabling isocyanate compounds to be produced without using phosgene as a raw material by subjecting a carbamic acid ester compound obtained by a reaction between an aromatic polycarbonate resin and an amine compound to a thermal decomposition reaction, while at the same time disclosing a process enabling chemical recycling of aromatic polycarbonate resin by recovering a divalent aromatic hydroxy compound forming aromatic polycarbonates.
REFERENCES:
patent: 2692275 (1954-10-01), Bortnick
patent: 3734941 (1973-05-01), Sydor
patent: 3992430 (1976-11-01), Bacskai
patent: 4081472 (1978-03-01), Tsumura et al.
patent: 4097676 (1978-06-01), Romano
patent: 4290970 (1981-09-01), Merger et al.
patent: 4386033 (1983-05-01), Konig et al.
patent: 4388246 (1983-06-01), Sundermann et al.
patent: 4388426 (1983-06-01), Schure et al.
patent: 4482499 (1984-11-01), Merger et al.
patent: 4613466 (1986-09-01), Merger et al.
patent: 4659845 (1987-04-01), Rivetti et al.
patent: 4692550 (1987-09-01), Engbert et al.
patent: 5364957 (1994-11-01), Arnoldy et al.
patent: 5386053 (1995-01-01), Otterbach et al.
patent: 5391802 (1995-02-01), Buysch et al.
patent: 5773643 (1998-06-01), Yagii et al.
patent: 6034265 (2000-03-01), Bosetti et al.
patent: 2003/0125579 (2003-07-01), Yoshida et al.
patent: 2003/0162995 (2003-08-01), Cesti et al.
patent: 52-71443 (1977-06-01), None
patent: 61-183257 (1986-08-01), None
patent: 64-85956 (1989-03-01), None
patent: 1-230550 (1989-09-01), None
patent: 6-25086 (1994-02-01), None
patent: 3382289 (1994-02-01), None
patent: 6-56985 (1994-03-01), None
patent: 2002-212335 (2002-07-01), None
patent: 2003-231774 (2003-08-01), None
patent: 2003-252846 (2003-09-01), None
patent: 2004-262834 (2004-09-01), None
patent: 2004-262835 (2004-09-01), None
patent: 2004-339147 (2004-12-01), None
patent: WO 2005/118584 (2005-12-01), None
Derwent Abstract of JP 2004262835, Sep. 24, 2004, Aso et al.
Dyer, et al., “Thermal Degradation of Alkyl N-Phenylcarbamates”, Journal of American Chemistry, 81, pp. 2138-2143, 1958.
Tarbell, et al., “Acidic and Basic Catalysis in Urethan Formation”, Journal of American Chemistry, 64, pp. 2229-2230, 1942.
Polymer Chemistry, vol. 20, No. 214, pp. 102-107, 1963.
The Collection of Preliminary Manuscripts or the Study Group of the Research Association for Feedstock Recycling of Plastics, vol. 3, pp. 31-32, 2001.
Polymer Preprints, Japan, vol. 54, No. 1, 2005.
Berchte der Deutechen Chemischen Gesellschaft, vol. 3, pp. 653-658, 1870.
Miyake Nobuhisa
Shinohata Masaaki
Asahi Kasei Chemicals Corporation
Morgan & Lewis & Bockius, LLP
Sawyer Jennifer C
Sullivan Daniel M
LandOfFree
Process for producing isocyanates and aromatic hydroxy... 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 producing isocyanates and aromatic hydroxy..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing isocyanates and aromatic hydroxy... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2659788