Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From organic oxygen-containing reactant
Reexamination Certificate
2005-03-08
2005-03-08
Truong, Duc (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From organic oxygen-containing reactant
C528S403000, C528S421000, C528S50200C, C528S503000
Reexamination Certificate
active
06864353
ABSTRACT:
The present invention provides a production process, in which, when an ethylene oxide copolymer is obtained, conditions for obtaining this copolymer having a desirable molecular weight with ease and good reproducibility are provided. The production process for an ethylene oxide copolymer, according to the present invention, comprises the step of carrying out polymerization of a monomer mixture under stirring in a solvent, thereby obtaining the ethylene oxide copolymer, wherein the monomer mixture includes ethylene oxide and a substituted oxirane compound of a structural formula (1) as essential raw materials; with the production process being characterized in that the stirring is carried out by a stirring power of not less than 0.6 kW/m3.
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Kikuta Manabu
Kono Michiyuki
Kuriyama Toshiaki
Nishiura Masahito
Saeki Koichiro
Dai-ichi Kogyo Seiyaku Co., Ltd.
Nippon Shokubai Co. , Ltd.
Truong Duc
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