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US 5,310,889 AGranted
Carbohydrate substituted dibenzo(d,f)(1,3,2)dioxaphosphepin stabilizers
AssigneeCiba-Geigy Corporation
InventorsStephen D. Pastor, Joseph E. Babiarz
Life of this patent
Estimating the term…
Abstract
Carbohydrate substituted dibenzo[d,f][1,3,2]dioxaphosphepin compounds of formula I ##STR1## where A is a carbohydrate residue are effective stabilizers for polymers processed at elevated temperatures and subject to thermal or oxidative degradation.
Claims11
A compound of formula I ##STR7## wherein n is 1 to 6,
- T.sub.1, T.sub.2, T.sub.3 and T.sub.4 are independently alkyl of 1 to 12 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, aryl of 6 to 10 carbon atoms or phenylalkyl of 7 to 15 carbon atoms, and
- A is a carbohydrate residue which is a radical, diminished by a hydroxyl or thiol group or an amine hydrogen atom, of a protected monohydroxy-functional, monothiol-functional or monoamine-functional sugar, thio-sugar or amino-sugar or derivatives thereof belonging to the group of sugar alcohols, esters of sugar acid, aldo-sugar acid or keto-sugar acid, amino-sugar, sugar mercaptal or deoxy-sugar.
Dependencies are inferred from the claim text.