The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 03, 2001
Filed:
May. 21, 1999
Shigeru Morita, Osaka, JP;
Toshihiko Amano, Osaka, JP;
Daikin Industries, Ltd., Osaka, JP;
Abstract
A hexafluoropropylene oxide oligomer of the formula: RfO[CF(CF,)CF,O],CF(CF,)COF in which Rf is a group represented by the formula: F(CF,),— in which m is an integer of 1 to 8, or the formula: (CF,),CF(CF,)q— in which q is an integer of 0 to 6, and n is a number of 3 to 20 is heated and thermally decomposed in a solvent at a temperature of at least 100° C. in the presence of a compound which generates a fluoride (F,) ion to obtain mainly the dimer, trimer and tetramer of hexafluoropropylene oxide. Thus, the valuable low molecular weight oligomers of hexafluoropropylene oxide can be obtained from high molecular weight oligomers of hexafluoropropylene oxide which have been discarded.