Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From heterocyclic reactant containing as ring atoms oxygen,...
Patent
1988-07-29
1990-07-24
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From heterocyclic reactant containing as ring atoms oxygen,...
528409, 528413, 528416, 528 76, 528 77, 528 78, 528 79, 525403, 525408, 525409, 568607, 568618, 568624, 558276, 558277, 560 26, 560 91, 560158, C08G 8100, C08G 6530, C08G 6532
Patent
active
049436260
ABSTRACT:
Polyether active hydrogen compounds having at least two terminal active hydrogen groups on primary carbon atoms are prepared by (a) forming polyoxyalkylene molecules each having at least one active hydrogen precursor, (b) linking at least two of the polyoxyalkylene molecules, and (c) converting the active hydrogen precursor groups to active hydrogen groups on primary carbon atoms. The polyoxyalkylene molecule is formed by exposing a reaction mixture comprising at least one alkylene oxide and at least one protective initiator to conditions effective for the polymerization of the alkylene oxides. Linking is accomplished at polyether chain ends distal to the protected active hydrogen precursor groups, such that the active hydrogen precursors remain on the linked polyether chains until they are converted to active hydrogen groups. The process is particularly useful to produce polyether compounds having at least about 80 mole percent primary active hydrogen groups, which compounds are useful, for instance, in forming polyurethanes.
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Lewis Diane M.
McGrath James E.
Turner Robert B.
Yoo Youngtai
Cavender Carol J.
Kight III John
Krass Frederick
Sutherland Barbara J.
The Dow Chemical Company
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