United States Patent 19 11 Patent Number: 5,753,190 Haseltine Et Al
IIIUS005753190A United States Patent 19 11 Patent Number: 5,753,190 Haseltine et al. 45 Date of Patent: May 19, 1998 54 WACUUM SYSTEM FOR CONTROLLING FOREIGN PATENT DOCUMENTS PRESSURE INA POLYESTER PROCESS O685502A2 12/1995 European Pat. Off. 158786 C 2/1983 German Dem. Rep. (75) Inventors: Douglas M. Haseltine; Thomas L. 2809113 A1 10/1979 Germany. Yount; Jimmy L. Ryans, all of 56-59842. A 5/1981 Japan . Kingsport, Tenn. 788404 7/1995 Japan. 73) Assignee: Eastman Chemical Company, OTHER PUBLICATIONS Kingsport, Tenn. Patent Abstracts of Japan, vol. 10, No. 321, C-382, abstract of JPA61-130336 (Toyobo Co Ltd), 18 Jun. 1986. 21) Appl. No.: 505,428 Patent Abstracts of Japan, vol. 10, No. 4, C-322, abstract of 22 Filed: Jul. 21, 1995 JPA60-163918 (Toyo Boseki K.K.), 26 Aug. 1985. Patent Abstracts of Japan, vol. 10, No. 194, C-358, abstract Related U.S. Application Data of JPA61-37819 (Toray Ind Inc), 22 Feb. 1986. Ryans, J. L. and D. L. Roper, Process Wacuum System 62 Division of Ser. No. 401,375, Mar. 9, 1995, Pat. No. Design & Operation, McGraw-Hill Book Company, New 5,466,765. York, 1986, pp. 230-237. 51 Int. Cl. .............. C08F 2/00 Primary Examiner-Christopher Kim (52) U.S. Cl. ... ... 422/131; 422/134; 203/73; Attorney, Agent, or Firm-Karen A. Harding; Harry J. 203/77 Gwinnell 58) Field of Search ..................................... 422/131, 134; 526/65, 71; 528/272,308.3,308.5; 203/73. 57 ABSTRACT 77, 87 The present invention discloses a polymerization system having at least two reaction chambers wherein vacuum is 56) References Cited used to remove vapors therefrom comprising a single U.S.
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