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Publication numberUST887005 I4
Publication typeGrant
Publication dateJun 1, 1971
Filing dateApr 2, 1970
Priority dateApr 2, 1970
Publication numberUS T887005 I4, US T887005I4, US-I4-T887005, UST887005 I4, UST887005I4
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Defensive publication
US T887005 I4
Abstract  available in
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Description  (OCR text may contain errors)

DEFENSIVE PUBLlCATlUN UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 0.G. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Oflice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED JUNE 1, 1971 T887,005 CONTROL OF MOLECULAR WEIGHT 0F POLY (ETHYLENE TEREPHTHALATE) DURING SOLID PHASE POLYCONDENSATION Charles J. Kibler, 620 Dogwood Drive 37663; David L. Nealy, 908 Afton St. 37660; and Thomas G. Davis, 1368 Garden Drive, 37664, all of Kingsport, Tenn.

Filed Apr. 2, 1970, Ser. No. 25,270 Int. Cl. C08g 17/03 US. Cl. 260-75 No Drawing. 15 Pages Specification Process of manufacturing a polyester by initially forming a molten prepolymer from a glycol, such as ethylene glycol and a difunctional compound such as terephthalic acid or a lower dialkyl diester thereof, solidifying the resulting prepolymer, crystallizing the prepolymer, pulverizing the crystallized prepolyrner, polymerizing the pulverized prepolyrner in a heated fluidized bed in the presence of a continuously introduced stream of preheated inert gas, wherein an improvement resides in maintaining within the fluidized bed a controlled concentration of glycol vapor, whereby the molecular Weight of the polymer is caused to attain a predetermined value.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5393871 *Jan 4, 1993Feb 28, 1995Eastman Chemical CompanyProduction of polyesters and polyester articles having good clarity
EP0085643A2 *Jan 18, 1983Aug 10, 1983THE GOODYEAR TIRE & RUBBER COMPANYProcess for the production of high molecular weight polyester
EP0085643A3 *Jan 18, 1983Aug 17, 1983The Goodyear Tire & Rubber CompanyProcess for the production of high molecular weight polyester
WO1994015990A1 *Jan 3, 1994Jul 21, 1994Eastman Chemical CompanyProduction of branched polyesters
WO1994015991A1 *Jan 3, 1994Jul 21, 1994Eastman Chemical CompanyProduction of polyesters and polyester articles having good clarity
U.S. Classification528/308.3
International ClassificationC08G63/00, C08G63/80
Cooperative ClassificationC08G63/80
European ClassificationC08G63/80