Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From heterocyclic reactant containing as ring atoms oxygen,...
Reexamination Certificate
2007-05-29
2007-05-29
Keys, Rosalynd (Department: 1621)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From heterocyclic reactant containing as ring atoms oxygen,...
C528S415000, C568S620000, C568S679000
Reexamination Certificate
active
10717093
ABSTRACT:
The present invention is directed to polyols prepared in the presence of double metal cyanide catalysts (“DMC”) which are prepared by combining i) at least one metal salt; ii) at least one metal cyanide salt; iii) at least one organic complexing ligand; iv) at least one alkali metal salt; and, optionally, v) at least one functionalized polymer under conditions sufficient to form a catalyst; and adding a sufficient amount of the at least one alkali metal salt to the catalyst so formed in an amount such that the catalyst includes the at least one alkali metal salt in an amount of from about 0.4 to about 6 wt. % based on the total weight of the catalyst. The polyols produced by the process of the present invention have reduced levels of high molecular weight tail.
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Journal of Polymer Scienc Part A: Polymer Chemistry vol. 40, (month unavailable) 2000, pp. 1142-1150, Yi-Jun Huang, Guo-Rong Qi, Yu-Hua Wang, “Controlled Ring-Opening Polymeriation of Propylene Oxide Catalyzed by Double Metal-Cyanide Complex”.
Le-Khac Bi
Wang Wei
Bayer Antwerpen, J.V.
Bayer MaterialScience LLC
Gil Joseph C.
Keys Rosalynd
Mrozinski, Jr. John E.
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