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US 6,472,449 B1Granted
Compressed, rigid polyurethane foams
AssigneeBayer Aktiengesellschaft
InventorsTorsten Heinemann, Karl-Werner Dietrich, Walter Klän
Life of this patent
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Abstract
Compressed polyurethane or polyisocyanurate foams useful as support materials for vacuum insulation units are produced by compressing an open-cell rigid polyurethane or polyisocyanurate to 5-95% of its original volume after 80-200% of the fiber time.
Claims7
A process for the production of a fine-cell polyurethane or polyisocyanurate rigid foam comprising
- a) reacting a polyol with a polyisocyanate in the presence of a blowing agent to produce an open-cell polyurethane or polyisocyanurate rigid foam and
- b) compressing the open-cell foam to from 5 to 95% of its starting volume after 80-200% of the fiber time.
Dependencies are inferred from the claim text.