Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From heterocyclic reactant containing as ring atoms oxygen,...
Patent
1998-05-05
2000-05-16
Dawson, Robert
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From heterocyclic reactant containing as ring atoms oxygen,...
502154, 502156, 528411, 528412, C08G 6504
Patent
active
060638974
ABSTRACT:
The amount of high molecular weight impurity present in a polyether polyol produced by alkoxylation of an active hydrogen-containing initiator and a substantially noncrystalline highly active double metal cyanide complex catalyst may be advantageously lowered by treating the catalyst prior to use in polymerization with a protic acid. Suitable protic acids include phosphoric acid and acetic acid. The higher purity polyether polyols thereby produced are particularly useful in the preparation of slab and molded polyurethane foams, which tend to collapse or become excessively tight when elevated levels of high molecular tail are present in the polyether polyol.
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Schuchardt et al., "Preparation of High Molecular Weight Polyols Using Double Metal Cyanide Catalysts," 32nd Annual Polyurethane Technical Marketing Conference, Oct. 1-4, 1989, pp. 360-364.
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Faraj Mahmoud K.
Le-Khac Bi
Wang Wei
Arco Chemical Technology L.P.
Aylward D.
Dawson Robert
Harper Stephen D.
Schuchardt Jonathan L.
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