American Cyanamid Company

William Baptist Hardy

Christos Savides

Frank F Loffelman

Joseph A Hoffman

Peter Vincent Susi

Ray Leonard Hillard

William Lindsay Mosby

Rex D Roberts

Tae B Min

Oligomers of the formula ##STR1## which contain at least one piperidinyl moiety in the repeating unit are useful as light stabilizers for polymers.

Novel light stabilizers for polymers

Isopropylidenedicyclohexylene esters of 2,2,6,6-tetramethylpiperidine-4-carboxylic acid are disclosed as well as their use as light stabilizers for thermoplastic polymers such as polypropylene.

Isopropylidenedicyclohexylene esters and their use as light stabilizers

A two stage reductive ring closure of o-nitrophenylazophenols produces 2-aryl-2H-benzotriazoles by (a) reacting an organic solvent solution of azophenol with an excess of an aqueous solution of a sulfhydrate or sulfide to form an N-oxide and (b) reducing the N-oxide with an alkali metal hydroxide plus zinc or tin.

Process for the preparation of 2-aryl-2H-benzotriazoles

Tertiary phosphine oxide compounds are disclosed as well as their use as stabilizers for polymers.

Polymers stabilized with organo-phosphorus compounds

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

Compounds of the formula: ##STR1## wherein R is hydrogen or alkyl (C.sub.1 -C.sub.8), R' is hydrogen, hydroxyl or lower alkoxy (C.sub.1 -C.sub.8); R' is alkyl (C.sub.1 -C.sub.20), alkylene (C.sub.2 -C.sub.12), cycloalkyl, wherein the alicyclic ring contains 5- or 6-carbon atoms, cycloalkylene, wherein the alicyclic ring may contain lower alkyl substituents, alkenyl (C.sub.3 -C.sub.20), arylene or aralkylene; n is an integer from 1 to 4, are useful for stabilizing polyolefin polymer against photo and thermal degradation.

Light and heat stabilizers for polyolefins

Compounds of the formula: ##STR1## wherein X is --H, --OH, --O. alkyl of 1 to 8 carbon atoms, or acyl of 2 to 10 carbon atoms, and R is alkyl of 1 to 8 carbon atoms are useful for stabilizing polyolefins against degradation by ultraviolet light.

1,3-BIS[(2,2,6,6-Tetraalkyl-4-piperidylidene)amino]guanidines as light

Thermal stability of vinyl chloride polymer is improved by use of a compound of the formula ##EQU1## WHEREIN N IS 1 OR 2 AND R is alkyl, alkylene, aryl, arylene, lower alkyl-substituted aryl or arylene, or fluoro-substituted aryl or arylene, alone or in combination with a divalent metal salt of a fatty acid of 12-20 carbon atoms.

Heat stabilizers for polyvinyl chloride

Thermal stability of vinyl chloride polymer is improved by use of a compound of the formula ##EQU1## wherein R.sub.1 is aryl or lower alkyl-substituted aryl; R.sub.2 is hydrogen or lower alkyl; n is 1 or 2; and R.sub.3 is hydrogen or lower alkyl when n is 1 and is alkylene of 1 to 4 carbon atoms or thiodiethylene when n is 2, alone or in combination with a divalent metal salt of a fatty acid of 12-20 carbon atoms.

Compounds of the formula: ##SPC1## Wherein X is --H, --OH, or --O.; R is --H or --OH; and Q is --C.tbd.N or ##EQU1## where R' is alkyl of 1 to 18 carbon atoms or hydrogen are useful for stabilizing polymers against degradation by ultraviolet radiation.

Tetramethylpiperidinylphosphine oxides as light stabilizers for polymers

Compounds of the formula ##SPC1## Wherein R is an alkyl of 1 to 8 carbon atoms and X is hydrogen or --OR, are useful, in combination with hindered-phenol antioxidants, for inhibiting thermal degradation of polyolefins, especially polypropylene, in contact with copper as metal, alloys, oxides, or salts. Such compounds can be prepared by reacting hydrazine with a naphthoic acid ester which may have an alkoxy group in the 3- position to form an intermediate which reacts with 3-alkoxy-2-naphthoyl chloride to form said compounds.

Growing community of inventors

Bound Brook, NJ, United States of America

William Baptist Hardy