公开(公告)号：US3687876A

公开(公告)日：1972-08-29

申请号：US3687876D

申请日：1970-09-04

Applicant: BAYER AG

Inventor： NAST ROLAND ,  DAHM MANFRED ,  LEY KURL

IPC: C08J9/00 ,  C08G22/44 ,  C08G51/58

CPC classification number: C08J9/0023 ,  C08J9/0014 ,  C08J2375/00 ,  C08J2375/04 ,  C08K5/15 ,  C08K5/36 ,  C08K5/50 ,  C08K5/52 ,  C08L75/04

Abstract: A PROCESS IS PROVIDED FOR THE PRODUCTION OF POLYURETHANE FOAMS FROM POLYISOCYANATES, ORGANIC COMPOUNDS WHICH CONTAIN AT LEAST TWO ACTIVE HYDROGEN ATOMS, BLOWING AGENTS, CATALYSTS, SUBSTANCES WHICH PREVENT DISCOLORATION IN THE CORE OF THE FOAM AND, IF DESIRED, OTHER ADDITIVES, WHEREIN DISCOLORATION PREVANTATIVE IS A 6-HYDROXYCHROMAN OF THE GENERAL FORMULA:

2-R2,2-R3,3-R4,4-R5,6-HO,7-R1-2H-CHROMAN

IN WHICH R1 IS HYDROGEN, AN ALKYL RADICAL, A CYCLOALKYL RADICAL OR AN ARALKYL RADICAL CONTAINING FROM ONE TO 9 CARBON ATOMS, AND R2, R3, R4 AND R5 ARE THE SAME OR DIFFERENT HYDROGEN OR LOWER ALKYL GROUP HAVING FROM ONE TO 4 CARBON ATOMS.