American Cyanamid Company

Joseph A Hoffman

Robert Jerome Tucker

Frank F Loffelman

William Baptist Hardy

Christos Savides

John Christian Oppelt

Tae B Min

Oligomers of the formula: ##STR1## wherein at least one of the substituents contains a piperidyl group are disclosed as light stabilizers for polymers. Also disclosed is a method for stabilizing a polymer which is normally subject to degradation by ultraviolet radiation, by incorporating therein an ultraviolet stabilizingly effective amount of such oligomer.

Novel light stabilizers for polymers

Oligomers of the formula ##STR1## which contain at least one piperidyl radical per repeating unit are useful as light stabilizers for polymers.

Hindered amine light stabilizers for polymers

Phosphonate compounds of the formula ##STR1## wherein R is hydrogen or methyl, R.sub.1 is hydrogen, methyl or ethyl, and y is an integer from 0 to 2, are useful as flame retardants for thermoplastic polymers, especially linear thermoplastic polyesters.

Cyclic diphosphonates

Compositions of nickel salts of 4-hydroxybenzoic acids and esters of aliphatic or aromatic carboxylic acids, which esters have boiling points of at least about 250.degree. C. are useful for stabilizing polyolefins against degradation by heat and ultraviolet radiation and for rendering polyolefins dyeable.

Nickel salt-ester stabilizing compositions

Flame retardant polyolefin compositions containing polymeric pentaerythrityl phosphonates and ammonium polyphosphate.

Polymeric pentaerythrityl phosphonates and their use as flame retardants

Self-extinguishing, non-dripping polyolefin polymer compositions are prepared from a mixture of certain pentaerythrityl diphosphonates and ammonium phosphate. Dicyanopentaerythrityl diphosphonate, a new compound, is useful herein without the polyphosphate.

Pentaerythrityl diphosphonate-ammonium polyphosphate combinations as

Products of the reaction of about 30 to 90 parts by weight of a compound of formula (I) ##STR1## wherein R.sub.1 and R.sub.2 are each alkyl radicals having up to 8 carbon atoms at least one of which is branched on the alpha carbon, and R.sub.3 and R.sub.4 are each hydrogen or an alkyl radical having up to 18 carbon atoms, and about 70 to 10 parts by weight, respectively, of a secondary or tertiary phosphite are useful for stabilizing polyolefins against degradation by heat and ultraviolet radiation and for rendering polyolefins dyeable by chelatable dyes such as aromatic ortho hydroxy azo dyes.

Nickel stabilizers and dye enhancers for polyolefins

Polyolefins and polyesters are flame-proofed with compounds having the formula ##STR1## wherein X is OH or NH.sub.2 and n is a whole, positive integer of 1-4, inclusive.

Polyolefins and polyesters flame-proofed with carboxyalkyl and

Compounds having the formula ##STR1## wherein X is OH or NH.sub.2 and n is a whole, positive integer of from 1-4, inclusive.

Carbamoylalkyl substituted poly(phosphine oxide) flame-retardants

Compounds having the formula ##EQU1## wherein X is OH or NH.sub.2 and n is a whole, positive integer of from 1-4, inclusive.

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Bridgewater, NJ, United States of America

Joseph A Hoffman