Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From organic oxygen-containing reactant
Reexamination Certificate
2005-06-14
2005-06-14
Truong, Duc (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From organic oxygen-containing reactant
C528S402000, C528S403000, C528S410000, C528S411000, C528S421000
Reexamination Certificate
active
06906167
ABSTRACT:
The present invention provides a process for efficiently obtaining polyethers having its high degree of polymerization by easily polymerizing substituted epoxides which could hardly or could not be made so far to provide a high degree of polymerization. That is, a polyether is obtained by a process which comprises ring-opening-polymerizing at least one substituted epoxide, except for propylene oxide and epihalohydrin, in the presence of a rare earth metal compound represented by the formula (I) and a reducing compound:Wherein M represents a rare earth element selected from Sc, Y and lanthanide, and L1, L2and L3are same as or different from each other and each of them represents an oxygen-binding ligand.
REFERENCES:
patent: 4049861 (1977-09-01), Nozari
patent: 4497861 (1985-02-01), Kistner
patent: 4680358 (1987-07-01), Yu
patent: 5114619 (1992-05-01), Heuvelsland
patent: 5210325 (1993-05-01), Kemp et al.
patent: 6417323 (2002-07-01), Miyanaga et al.
patent: 60-4568 (1985-01-01), None
patent: 62-174229 (1987-07-01), None
patent: 7-109351 (1995-04-01), None
patent: WO 96/19519 (1996-06-01), None
patent: WO 98/15598 (1998-04-01), None
Y. Zhang et al, Inorganica Chimita Acta, 155, 1989, pp. 263-265.
H. Yasuda et al, Macromol. Chem. Phys. 196, 1995, pp. 2417-2441.
J. Wu et al, Polymer Journal, vol. 22, No. 4, pp. 326-330, “Rare Earth Coordination Catalysts for the Polymerization of Alkylene Oxides I. Polymerization of Epichlorohydrin,”, 1990.
Kawamukai Hiroshi
Miyanaga Seiichi
Oda Takashi
Kao Corporation
Truong Duc
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