Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From heterocyclic reactant containing as ring atoms oxygen,...
Patent
1989-05-30
1990-08-07
Nielsen, Earl
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From heterocyclic reactant containing as ring atoms oxygen,...
528499, 568621, 210644, 210651, C08G 6530, B01D 1300
Patent
active
049469398
ABSTRACT:
High purity polyether polyol compositions such as polyethylene glycol are made having small amounts of impurities such as oligomers of active hydrogen compounds with alkylene oxides. The high purity is achieved by subjecting the polyether polyol compositions to membrane filtration to get less than about 10 parts per million of the low molecular weight oligomers.
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Grierson Jeff G.
Jernigan Robert T.
Murphy Frank H.
Wessels Wayne G.
Nielsen Earl
The Dow Chemical Company
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