The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 26, 2004
Filed:
Dec. 13, 2002
Hans-Michael Sulzbach, Königswinter, DE;
Reiner Raffel, Siegburg, DE;
Martin Schamberg, Hennef, DE;
Hennecke GmbH, Leverkusen, DE;
Abstract
The invention relates to a method for the production of polyurethane block foam, wherein a polyurethane reactive mixture containing carbon dioxide is suddenly relieved from a pressure above the pressure breaking the equilibrium of the carbon dioxide to a normal pressure, wherein the liquid polyurethane reactive mixture is foamed by releasing dissolved carbon dioxide. The foamed mixture is placed on a substrate and then hardened into block foam, wherein the carbon dioxide or at least one of the components polyol and isocyanate is initially dissolved in the reactive mixture at a pressure that is substantially above the pressure breaking the equilibrium, the pressure is subsequently lowered to a pressure close to the pressure breaking the equilibrium, wherein the pressure falls below the pressure breaking the equilibrium by releasing small amounts of carbon dioxide and forming a microdispersion of bubbles, the components are optionally mixed and a sudden pressure drop to normal pressure occurs before the carbon dioxide released is completely dissolved.