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US 3,945,968 AGranted
Heat-resistant polyurethane compositions
AssigneeRhone-Poulenc-Textile
InventorJean Goletto
Life of this patent
Estimating the term…
Abstract
Polyurethanes are rendered resistant to heat and oxidation by addition, as stabiliser, of a hydroxylic spiro-bis-indane of the formula: ##SPC1## In which each of the R.sub.1 radicals which may be identical or different; represents a methyl or ethyl radical, and each of Z.sub.1, Z.sub.2, Z.sub.3, Z.sub.4, Z.sub.5 and Z.sub.6, which may be identical or different, represents a hydrogen atom, a hydroxyl group an alkyl radical, an alkoxy radical or a halogen atom.
Claims11
A polyurethane composition which comprises, as stabiliser, a hydroxylic spiro-bis-indane compound of the formula:
- ##SPC4##
- in which each of the R.sub.1 radicals which may be identical or different;
- represents a methyl or ethyl radical, and each of Z.sub.1, Z.sub.2, Z.sub.3, Z.sub.4, Z.sub.5 and Z.sub.6, which may be identical or different;
- represents a hydrogen atom, a hydroxyl group, an alkyl radical, an alkoxy radical or a halogen atom, said compound possessing at least two hydroxyl groups on each benzene ring.
1 more element
Dependencies are inferred from the claim text.