Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Patent
1997-05-16
1998-12-01
Krass, Frederick
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
528 92, 528414, 528483, 528485, 528491, 528492, 528493, 528494, 528495, 528496, 528497, 528498, 521 92, 521123, 568867, 568868, 525403, 525404, 525407, 525409, 525474, 525476, 525479, C08F 600, C08G 5968, C08G 6504, C08J 300
Patent
active
058440704
ABSTRACT:
A process for activating double metal cyanide catalysts is disclosed. A polyol starter or starter/catalyst mixture is heated under vacuum under conditions effective to achieve improved stripping compared with that which can be achieved through conventional vacuum stripping. Coupling vacuum stripping with inert gas sparging or stripping in the presence of an organic solvent gives a starter/catalyst mixture that activates rapidly in an epoxide polymerization process. Rapid activation makes process start-ups reliable and reduces cycle time. The process gives polyols with lower viscosity, lower polydispersity, and lower unsaturation for better polyurethanes.
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Armellini Fred J.
Hayes John E.
Isaacs Bruce H.
Langsdorf Leah J.
Arco Chemical Technology L.P.
Krass Frederick
Schuchardt Jonathan L.
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