Process for continuous control of the cell number of polyurethane foams
AssigneeKoepp Aktiengesellschaft
InventorsUlrich Wetzig, Manfred Hohenhorst
Life of this patent
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Abstract
The process for continuous control of cell number in the production of polyurethane foams from polyols, isocyanates and water, where mixing the components is effected in a mixing head with adjustable injection pressure and adjustable mixing chamber pressure, consists in that immediately prior to entering the mixing head the gas content of the isocyanate is continuously increased or reduced.
Claims8
A process for continuous control of cell number in the production of polyurethane foams from components including isocyanates, compounds having at least two hydrogens reactive with an isocyanate group, and water, where mixing the components is effected in a mixing head with adjustable injection pressure and adjustable mixing chamber pressure, characterized in that prior to entering the mixing head the gas content of the isocyanate is continuously increased or reduced.
Apparatus for continuous control of cell number in polyurethane foams, comprising:
- a mixing head having adjustable injection pressure and adjustable mixing chamber pressure, the mixing head being provided with a source of water and a compound having at least two hydrogens which are reactive toward an isocyanate group;
- and
- a source supplying isocyanate to the mixing head, provided with means for continuously increasing or decreasing the gas content of the isocyanate prior to entering the mixing head.
Dependencies are inferred from the claim text.