Polymer compositions stabilized with hindered phenyl secondary phosphites

Claim 2

Compositions comprising a polymer normally subject to deterioration stabilized with (a) 0.005 to 5% of a stabilizer having the formula ##STR8## wherein R is hydroxy or chlorine, Y and Y' are independently alkyl having from 1 to 12 carbon atoms or aralkyl having from 7 to 12 carbon atoms, and Z is independently hydrogen, halogen, alkyl having from 1 to 12 carbon atoms or aralkyl having from 7 to 12 carbon atoms.

Claim 3

A composition according to claim 1 wherein R is hydroxy.

Claim 4

A composition according to claim 1 wherein R is chlorine.

Claim 5

A composition according to claim 1 wherein Y and Y' are each t-butyl.

Claim 6

A composition according to claim 1 wherein R is hydroxy, Y and Y' are each t-butyl, and Z is hydrogen or t-butyl.

Claim 7

A composition according to claim 1 wherein the polymer is polyolefin.

Claim 8

A composition according to claim 1 wherein the polymer is polypropylene.

Claim 9

A composition according to claim 1 wherein the polymer is acrylonitrile-butadiene-styrene terpolymer.

Claim 10

A composition according to claim 1 wherein the polymer is polystyrene.

Claim 11

A composition according to claim 1 wherein the polymer is styrene-butadiene copolymer.

Claim 12

A composition according to claim 1 wherein the polymer is a polyester composition containing polyalkylene terephthalate.

Claim 13

A composition according to claim 1 wherein the polymer is selected from polypropylene, polyethylene, acrylonitrile-butadiene-styrene terpolymer, styrene-butadiene copolymer, polyalkylene terrphthalate and impact polystyrene.

Claim 14

The composition according to claim 1 which contains 0.005 to 5% of a thioco-stabilizer.

Claim 15

A composition according to claim 13 comprising (i) from 0.005 to 5% of the hindered phosphite of formula (I) and from 0.005 to 5% of the thio-costabilizer and (ii) a polymer selected from acrylonitrile-butadiene-styrene terpolymer, styrene-butadiene copolymer, and polyalkylene terephthalate.

Claim 16

The composition according to claim 1 which contains 0.005 to 5% of a phenolic antioxidant.

Claim 17

A composition according to claim 15 consisting essentially of (i) a polymer selected from polypropylene, polyethylene, impact polystyrene, polyalkylene terephthalate and acrylonitrile-butadiene-styrene terpolymer, (ii) a hindered phosphite of formula (I), and (iii) 0.005 to 5% of a phenolic antioxidant selected from tetrakis [methylene 3-(3',5'-di-tert-butyl-4'-hydroxyphenyl)propionate]methane, octadecyl 3-(3'-5'-di-tert-butyl-4'-hydroxyphenyl)propionate, di-n-octadecyl-3,5-di-tert-butyl-4-hydroxybenzyl phosphonate, N,N'-hexamethylene bis(3,5-di-tert-butyl-4-hydroxy-hydrocinnamamide, 2,2'-methylene-bis(6-t-butyl-4-ethylphenol) and 2,6-di-t-butyl-4-methylphenol.

Claim 18

A composition according to claim 15 consisting essentially of (i) polyolefin, (ii) a hindered phosphite of formula (I), and (iii) 0.005 to 5% of a thio-co-stabilizer having the formula ##STR9## wherein R 1 is an alkyl group having from 6 to 24 carbon atoms and n is an integer of from 1 to 6.

Claim 19

The composition according to claim 15 which contains 0.005 to 5% of a UV absorber or light stabilizer.

Claim 20

A composition according to claim 18 consisting essentially of (i) polyolefin, (ii) a hindered phosphite of formula (I) (iii) 0.005 to 5% of a p-hydroxybenzoate having the formula ##STR10## wherein R 5 is (lower) alkyl containing from 1 to 6 carbon atoms, R 6 is hydrogen or (lower) alkyl containing from 1 to 6 carbon atoms, and R 7 is alkyl of from 1 to 24 carbon atoms, phenyl or phenyl substituted by one or two alkyl groups of 1 to 12 carbon atoms, and (iv) 0.005 to 5% of a phenolic antioxidant selected from tetrakis[methylene 3-(3',5'-di-tert-butyl-4'-hydroxyphenyl)propionate]methane, octadecyl 3-(3',5'-di-tert-butyl-4'-hydroxyphenyl)propionate, di-n-octadecyl-3,5-di-tert-butyl-4-hydroxybenzyl phosphonate, 2,6-di-t-butyl-4-methylphenol, and tris 2,4,6-(3,5-di-t-butyl-4-hydroxybenzyl)isocyanurate.

Claim 21

A composition according to claim 18 consisting essentially of (i) polypropylene, (ii) a hindered phosphite of formula (I), (iii) 0.005 to 5% of a benzotriazole having the formula ##STR11## wherein R 2 is hydrogen, chlorine or lower alkyl containing from 1 to 6 carbon atoms, R 3 is hydrogen, alkyl containing 1 to 12 carbon atoms, phenyl or benzyl, and R 4 is hydrogen, chlorine or (lower) alkyl containing from 1 to 6 carbon atoms, and (iv) 0.005 to 5% of a phenolic antioxidant selected from tetrakis[methylene-3-(3',5'-di-tert-butyl-4'-hydroxyphenyl)propionate]methane, octadecyl 3-(3',5'-di-tert-butyl-4'-hydroxyphenyl)propionate, di-n-octadecyl-3,5-di-tert-butyl-4-hydroxybenzyl phosphonate, 2,6-di-t-butyl-4-methylphenol, and tris-2,4,6-(3,5-di-t-butyl-4-hydroxybenzyl)isocyanurate.

Claim 22

The composition according to claim 1 which contains 0.005 to 5% of a UV absorber or light stabilizer.

Claim 23

The composition according to claim 15 which contains 0.005 to 5% of a thio co-stabilizer.

Claim 24

The composition according to claim 13 which contains 0.005 to 5% of a UV absorber or light stabilizer.

Claim 25

The composition according to claim 22 which contains 0.005 to 5% of a UV absorber or light stabilizer.

Claim 26

The composition according to claim 19 which contains 0.005 to 5% of a thio-co-stabilizer having the formula ##STR12## wherein R 1 is an alkyl group having from 6 to 24 carbon atoms and n is an integer of from 1 to 6.

Claim 27

The composition according to claim 20 which contains 0.005 to 5% of a thio-co-stabilizer having the formula ##STR13## wherein R 1 is an alkyl group having from 6 to 24 carbon atoms and n is an integer from 1 to 6.