Patent · US Expired

Method for producing soft to medium-hard structural polyurethane foams

US6235799A · kind A · utility

1Cited by

12References

7Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Norbert Eisen · Hanerau-Hademarschen, DE
Geza Avar · Leverkusen, DE
Peter Haas · Brisbane, AU

Key dates

Filing date	Nov 17, 1999
Grant date	May 22, 2001
Priority date	—
Expiry date	Nov 17, 2019

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2375/04
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

The invention provides a process for preparing flexible to semi-rigid polyurethane moulded items with compacted edge zones with given hardness and a much more flexible cellular core, so-called integral foams, in which physical blowing agents from the set comprising C.sub.6 hydrocarbons are used.

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