Benzene phosphonous acid compounds, their production and use as stabilizers for organic materials
AssigneeSandoz Ltd.
InventorsKurt Hofer, Guenther Tscheulin
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Abstract
The purpose of the invention are new benzene phosphonous acid compounds in which two to four benzene nuclei are bound together and which contain one to three phosphorus atoms. The new compounds are free acids, their salts with inorganic cations, their esters, thioesters or amides. The invention concerns also the manufacture of these benzene phosphonous acid compounds and their use for the stabilization of organic materials.
Claims13
A composition stabilized against the effect of light, oxygen and/or heat which comprises an organic polymeric material which is sensitive to said effect and an effective amount of a stabilizing agent of the formula
- wherein each of
- R.sub.1, r.sub.2, r.sub.3 and R.sub.4, independently, is a hydrocarbon radical of up to 16 carbon atoms, selected from the group consisting of alkyl which is unsubstituted or substituted by methoxy, phenoxy, cresoxy or chloro, cycloalkyl, aryl which is unsubstituted or substituted by methoxy or chloro, alkylaryl and benzyl which is unsubstituted or substituted by chloro,
- Y is oxygen or sulphur
- n is 1 or 2 and
- the polyphenylene moiety is unsubstituted or substituted by alkyl, cycloalkyl, chlorine, bromine or alkoxy.
Dependencies are inferred from the claim text.