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US 6,646,100 B2Granted
Aliphatic polycarbonate homo-and co-polymers produced by DMC catalysis and the process for their production
AssigneeBayer Aktiengesellschaft
InventorsJörg Hofmann, Walter Schäfer, Christian Steinlein
Life of this patent
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Abstract
Aliphatic polycarbonate homo- and co-polymers are obtained by ring-opening homo- or co-polymerization of cyclic carbonates by DMC catalysis. These polymers are useful in the production of polyurethanes.
Claims10
An aliphatic polycarbonate polymer produced by ring-opening polymerization of a cyclic carbonate in the presence of a DMC catalyst.
A process for the production of a polyol comprising ring-opening a cyclic carbonate in the presence of a DMC catalyst.
A process for the production of a poly(ether-carbonate) polyol comprising
- a) producing a polyether polyol by polyaddition of an epoxide to a starter compound exhibiting active hydrogen atoms in the presence of a DMC catalyst and
- b) reacting the polyether polyol containing the active DMC catalyst with a cyclic carbonate under conditions such that ring-opening in the cyclic carbonate occurs.
Dependencies are inferred from the claim text.