Patent · US Active

Viscoelastic foams having high density

US10927212B2 · kind B2 · utility

0Cited by

5References

8Claims

0Family size

Assignee

BASF SE

Inventors

Udo Hadick · Lemförde, DE
Heinz-Dieter Lutter · Diepholz, DE
Stefanie Hiller · Gerabronn, DE
Maike Grever · Lage, DE

Key dates

Filing date	May 2, 2017
Grant date	Feb 23, 2021
Priority date	—
Expiry date	Sep 29, 2037

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2375/08
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Provided herein is a process for producing viscoelastic polyurethane foams having a density of from 100 g/dm3 to 300 g/dm3, 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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.