Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Reexamination Certificate
2007-04-02
2009-02-03
Kugel, Timothy J. (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
C528S501000, C528S503000
Reexamination Certificate
active
07485696
ABSTRACT:
Disclosed is an oxytetramethylene glycol copolymer, which is obtained by copolymerizing tetrahydrofuran and neopentyl glycol and which has a specific number average molecular weight Mn, a specific molecular weight distribution Mw/Mn, a specific neopentyl glycol copolymerization whole ratio Nwand a specific neopentyl glycol copolymerization partial ratio Nh, and a method for producing the same. Also disclosed is a method for purifying an oxytetramethylene glycol copolymer, which comprises adding a fresh tetrahydrofuran to a reaction mixture comprising an oxytetramethylene glycol copolymer and an unreacted diol, wherein the amount of added tetrahydrofuran is not less than the weight of the unreacted diol contained in the reaction mixture, and distilling off the unreacted diol together with the added tetrahydrofuran.
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Aoshima et al., JP-61126134—English abstract Jun. 1986.
Aoshima et al., JP-61126134—Derwent English abstract Jun. 1986.
Aketo JP-10-025340- Machine English Translation obtained from JPO website E Jan. 1998.
Fukuzono Toshihiko
Furubeppu Satoshi
Kodama Tamotsu
Minoura Haruyuki
Tsunematsu Yoshiyuki
Asahi Kasei Kabushiki Kaisha
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Kugel Timothy J.
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