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US 4,183,879 AGranted
Diphosphonic acids and esters of para-menthane
AssigneeSCM Corporation
InventorDavid R. Battiste
Life of this patent
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Abstract
Disclosed are novel diphosphonic acids and diphosphonic acid esters of para-menthane which may be prepared by reacting .alpha.-pinene or .beta.-pinene with a dialkyl hydrogen phosphite under effective free-radical conditions. These products are potentially useful as flame retardants and are useful as treating agents for improving the pigmentary properties of pigmentary titanium dioxide in thermoplastic formulations.
Claims7
A compound selected from ##STR4## where R.sub.1, R.sub.2, R.sub.3, and R.sub.4, independently, are hydrogen or a C.sub.1 -C.sub.10 alkyl group.
Dependencies are inferred from the claim text.