Polyurethane foam free from internal discoloration

US3931060A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Rudiger Schubart · Wittlich, DE
• Ulrich Nehen · Leverkusen, DE
• Ernst Roos
• Manfred Dahm · Leverkusen, DE

Key dates

• Filing date: Aug 12, 1974
• Grant date: Jan 6, 1976
• Expiry date: Aug 12, 1994

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2375/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polyurethane foams which are free from the usual discoloration particularly in the center of a block thereof are prepared from a foamable reaction mixture containing A. a heterocyclic mercapto compound of the formula ##SPC1## In which X = --o--, --s--, --nh--, --n--(c.sub.1 -c.sub.12)--alkyl, --N--(C.sub.5 -C.sub.6)--cycloalkyl--, --N--phenyl, --N--(C.sub.7 -C.sub.12)--aralkyl, --N--(C.sub.7 --C.sub.12)--alkylaryl-- or --N--CO--(C.sub.1 -C.sub.6)--alkyl, ##EQU1## ##SPC2## R = H, (C.sub.1 -C.sub.12)--alkyl, (C.sub.1 -C.sub.12)--alkoxycarbonyl--, (C.sub.1 -C.sub.12)--alkoxy and B. a phenol of the general formula ##SPC3## In which R.sup.1 and R.sup.3 may be the same or different and denote C.sub.1 -C.sub.9 --alkyl--, C.sub.5 -C.sub.6 --cycloalkyl--, C.sub.7 -C.sub.9 --alkylaryl--, indanyl or norbornyl groups and R.sup.2 = R.sup.1 or --CH.sub.2 --CH.sub.2 --COO--(C.sub.1 -C.sub.12)--alkyl.