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:
Feb. 23, 2021
Filed:
May. 02, 2017
Basf SE, Ludwigshafen am Rhein, DE;
Udo Hadick, Muenster, DE;
Heinz-Dieter Lutter, Huede, DE;
Stefanie Hiller, Rahden, DE;
Maike Grever, Stemwede-Drohne, DE;
BASF SE, Ludwigshafen am Rhein, DE;
Abstract
Provided herein is a process for producing viscoelastic polyurethane foams having a density of from 100 g/dmto 300 g/dm, in which (a) polyisocyanate is mixed with (b) polymeric compounds having groups that are reactive toward isocyanates, (d) a catalyst, and (e) a blowing agent including water at an isocyanate index of from 50 to 95 to give a reaction mixture. The reaction mixture is placed in a mold and reacted to give the flexible polyurethane foam, wherein the polyisocyanate (a) is obtainable by mixing 4,4'-MDI and oligomers of propylene oxide having from 2 to 8 propylene oxide units. The polymeric compounds (b) include at least one polyalkylene oxide having a hydroxyl number of from 20 to 50 mg KOH/g derived from a trifunctional starter molecule and a proportion of ethylene oxide, based on the content of alkylene oxide, of from 0 to 10% by weight.