Back to results
US 2002/0120026 A1Published application
Co-initiated polyols useful for the production of rigid polyurethane foams
AssigneeBayer Aktiengesellschaft
InventorsSteven L. Schilling, Herman P. Doerge, Edward E. Ball, Keith J. Headley
Life of this patent
Estimating the term…
Abstract
A co-initiated polyether polyol is produced by suspending a solid polyhydroxyl compound in an amine-initiated polyol, heating the suspension and alkoxylating the heated suspension. These co-initiated polyether polyols are particularly useful for the production of polyurethanes.
Claims15
A process for the production of a co-initiated polyether polyol comprising:
- a) suspending
- (1) a polyhydroxyl compound which melts above 95° C. or decomposes before melting and has a hydroxyl group functionality greater than or equal to 4,
- in
- (2) an amine-initiated polyether polyol which
- (i) is a liquid,
- (ii) has a viscosity sufficiently low that stirring of the amine-initiated polyol, the polyhydroxyl compound (1) and any optional materials present is possible at processing conditions,
- (iii) has a hydroxyl number sufficiently high to permit reaction with enough ethylene oxide and/or propylene oxide to produce a co-initiated polyol having a selected hydroxyl number, and
- (iv) has a hydroxyl functionality greater than or equal to 4
- in an amount such that a stirrable slurry or suspension is formed, and optionally,
- (3) a catalyst, and
- (4) a co-initiator which is different from (1) or (2),
- b) heating the slurry or suspension generated in step a) to or maintaining the slurry at a temperature of from about 80 to about 150° C., and
- c) reacting the heated slurry or suspension from step b) with ethylene oxide and/or propylene oxide to form the co-initiated polyol.
10 more elements
Dependencies are inferred from the claim text.