Stabilizers for polymer polyols
AssigneeArco Chemical Technology, L.P.
InventorsJianzhong Shen, Kenneth G. McDaniel, John E. Hayes, Uli B. Holeschovsky, Harry R. Hinney
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Abstract
Unique, well defined polyethers containing both hydroxyl-functionality and unsaturation-functionality are prepared by oxyalkylating an unsaturated monomer having at least one oxyalkylatable hydrogen in the presence of an effective amount of a double metal cyanide complex catalyst, optionally, when necessary, in the presence of a free radical polymerization inhibitor. The resulting polyethers are eminently suitable for such uses as polymer polyol stabilizers or stabilizer precursors, and both in situ and ex situ impact modifiers for thermoplastics.
Claims29
A process for the preparation of a well defined hydroxyl-functional and unsaturation-functional polyoxyalkylene polyether, said process comprising:
- (a) selecting an initiator molecule having a number average molecular weight below about 500 Da, at least one site of carbon-carbon unsaturation, and at least one functional group which is oxyalkylatable by alkylene oxide in the presence of a double metal cyanide complex, wherein said initiator molecule has not more than one free carboxylic acid group;
- (b) oxyalkylating said initiator molecule with one or more alkylene oxides in the presence of an effective amount of a double metal cyanide complex catalyst and in the presence of one or more vinyl polymerization inhibitors;
- (c) recovering a hydroxyl- and unsaturation-functional polyoxyalkylene polyether having not more than substantially one initiator molecule per molecule of polyether and not more than about 0.020 meq/g unsaturation beyond that of initiator molecule-derived unsaturation.
A process for the preparation of a well-defined hydroxyl-functional and unsaturation-functional polyoxyalkylene polyether, said process comprising:
- (a) selecting an initiator molecule having a number average molecular weight below about 500 Da, at least one site of carbon-carbon unsaturation, and at least one functional group which is oxyalkylatable by alkylene oxide in the presence of a double metal cyanide complex catalyst, wherein said initiator molecule has not more than one free carboxylic acid group;
- (b) oxyalkylating said initiator molecule with one or more alkylene oxides in the presence of an effective amount of a double metal cyanide complex catalyst at a temperature below about 90.degree. C.;
- (c) recovering a hydroxyl- and unsaturation-functional polyoxyalkylene polyether having not more than substantially one initiator molecule per molecule of polyether and not more than about 0.020 meq/g unsaturation beyond that of initiator molecule-derived unsaturation.
Dependencies are inferred from the claim text.