Stabilised resin composition

Patent metadata

Field	Value
Publication number	US-10214627-B2
Application number	US-201515311032-A
Country	US
Kind code	B2
Filing date	May 13, 2015
Priority date	May 15, 2014
Publication date	Feb 26, 2019
Grant date	Feb 26, 2019

Abstract

The invention is directed to a resin composition that has both high heat resistance and high resistance against ultraviolet radiation. The invention is further directed to an article comprising said composition, and to the use of a combination of compounds for stabilising a resin composition. The resin composition of the invention comprises (A) a polypropylene resin, (B) an optionally substituted linear or branched alkyl ester of 3-(alkylated 4′-hydroxyphenyl) propionic acid having a molecular weight of 750 g/mol or less, (C) a hindered amine light stabiliser, having a molecular weight of 1250 g/mol or more, wherein the hindered amine is comprised in the backbone of the hindered amine light stabiliser molecule, and (D) a thiosynergist.

First claim

The invention claimed is:

1. A resin composition comprising
(A) a polypropylene resin,
(B) an optionally substituted linear or branched alkyl ester of 3-(alkylated 4′-hydroxyphenyl) propionic acid having a molecular weight of 750 g/mol or less,
(C) a hindered amine light stabiliser, having a molecular weight of 1250 g/mol or more, wherein the hindered amine is comprised in the backbone of the hindered amine light stabiliser molecule, and
(D) a thiosynergist comprising a sulphur-based hydroperoxide decomposer.

2. A resin composition according to claim 1 , further comprising
(E) a phenolic antioxidant different from (B).

3. A resin composition according to claim 1 , further comprising
(F) an antioxidant different from (B) and (E), selected from the group consisting of secondary antioxidants and non-phenolic antioxidants.

4. A resin composition according to claim 1 , wherein said a polypropylene resin (A) is a heterophasic polypropylene comprising a polypropylene homopolymer matrix phase and a disperse propylene/α-olefin elastomeric copolymer phase.

5. A resin composition according to claim 1 , wherein said phenolic antioxidant (B) has one phenolic group per molecule.

6. A resin composition according to claim 1 , wherein the phenolic antioxidant (B) is selected from the group consisting of
C 1-20 -3-(3,5-di-t-butyl-4-hydroxyphenyl)propionates,
preferably the phenolic antioxidant (B) is selected from the group consisting of
methyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate,
octyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate,
isooctyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate,
tridecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate,
tetradecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate,
heptadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate,
hexadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate,
heptadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate,
octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, and
nonadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate.

7. A resin composition according to claim 1 , wherein said hindered amine light stabiliser (C) has a molecular weight of from 1500-4000 g/mol.

8. A resin composition according to claim 1 , wherein said hindered amine light stabiliser (C) comprises a group according to formula (I) in the backbone

9. A resin composition according to claim 1 , wherein said hindered amine light stabiliser (C) comprises a group according to formula (II) in the backbone

10. A resin composition according to claim 1 , wherein said hindered amine light stabiliser (C) comprises a group according to formula (III) in the backbone

11. A resin composition according to claim 1 , wherein the hindered amine light stabiliser (C) is selected from the group consisting of

wherein n is in the range of 9-16, and

wherein m is in the range of 3-10.

12. A resin composition according to claim 11 , wherein the hindered amine light stabiliser (C) is (poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidine ethanol-alt-1,4-butanedioic acid), or a polymer of 2,2,4,4-tetramethyl-7-oxa-3,20-diaza-dispiro[5.1.11.2]-heneicosan-21-on and epichlorohydrin.

13. A resin composition according to claim 1 , wherein the resin composition is substantially free from hindered amine light stabilisers having a molecular weight of less than 1250 g/mol.

14. A resin composition according to claim 1 , wherein the resin composition is completely free from hindered amine light stabilisers having a molecular weight of less than 1250 g/mol.

15. A resin composition according to claim 1 , wherein said thiosynergist (D) is selected from the group consisting of dilauryl thiodipropionate, distearyl-3,3′-thiodipropionate and neopentanetetrayl tetrakis(3-dodecylthiopropionate).

16. Resin composition according to claim 1 , wherein said thiosynergist is distearyl-3,3′-thiodipropionate.

17. A resin composition according to claim 1 , wherein said phenolic antioxidant (E) has two or more phenolic groups per molecule.

18. A resin composition according to claim 1 , wherein said phenolic antioxidant (E) is selected from the group consisting of
2,2′-methylenebis(4-methyl-6-t-butylphenol),
4,4′-butylidenebis(3-methyl-6-t-butylphenol),
4,4′-thiobis(3-methyl-6-t-butylphenol),
2,2′-thiobis(4-methyl-6-t-butylphenol),
4,4′-methylenebis(2,6-di-t-butylphenol),
2,2′-methylenebis[6-(1-methylcyclohexyl)-p-cresol],
2,2′-ethylidenebis(2,4-di-t-butylphenol),
2,2′-butylidenebis(2-t-butyl-4-methylphenol),
1,1,3-tris(2-methyl-4-hydroxy-5-t-butylphenyl)butane, triethylene glycol-bis[3-(3-t-butyl-5-methyl-4-hydroxyphenyl)propionate],
1,6-hexanediol-bis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate],
2,2-thiodiethylenebis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate],
N,N′-hexamethylenebis(3,5-di-t-butyl-4-hydroxyhydrocinnamide),
3,5-di-t-butyl-4-hydroxybenzylphosphonate-diethyl ester
1,3,5-tris(2,6-dimethyl-3-hydroxy-4-t-butylbenzyl)isocyanurate,
1,3,5-tris[(3,5-di-t-butyl-4-hydroxyphenyl)propionyloxyethyl]isocyanurate,
tris(4-t-butyl-2,6-dimethyl-3-hydroxybenzyl)isocyanurate,
2,4-bis(n-octylthio)-6-(4-hydroxy-3,5-t-butylanilino)-1,3,5-triazine,
tetrakis[methylene-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate] methane,
bis(3,5-di-t-butyl-4-hydroxybenzylphosphonic acid ethyl ester) calcium,
bis(3,5-di-t-butyl-4-hydroxybenzylphosphonic acid ethyl ester) nickel,
bis[3,3-bis(3-t-4-hydroxyphenyl)butyric acid] glycol ester,
N,N′-bis[3 ,5-di-t-butyl-4-hydroxyphenyl)propionyl]hydrazine,
2,2′-oxaimidobis[ethyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate],
2,2′-methylenebis(4-methyl-6-t-butylphenol)terephthalate,
1,3,5-trimethyl-2,4,6-tris(3,5-di-t-butyl-4-hydroxybenzyl) benzene,
3,9-bis[1,1-dimethyl-2-{13-(3-t-butyl-4-hydroxy-5-methylphenyl)propionyloxy} ethyl]-2,4,8,10-tetraoxaspiro[5,5]-undecane,
2,2-bis[4-(2-)3,5-di-t-butyl-4-hydroxyhydrocinnamoyloxy))ethoxyphenyl] propane, and
alkyl esters of β-(3,5-di-t-butyl-4-hydroxyphenyl)propionic acid.

19. A resin composition according to claim 1 , wherein the antioxidant (F) is selected from the group consisting of phosphite secondary antioxidants.

20. A resin composition according to claim 1 , wherein the antioxidant (F) is selected from the group consisting of
tris(nonylphenyl)phosphite, tris(2,4-di-i-butylphenyl)phosphite,
bis(2,4-di-i-butylphenyl)pentaerythritol diphosphite,
bis(2,6-di-i-butyl-4-methylphenyl) pentaerythritol diphosphite,
bis(2,4-di-i-butyl-6-methylphenyl)pentaerythritol diphosphite,
bis(2,4,6-tri-i-butylphenyl)pentaerythritol diphosphite,
tetrakis(2,4-di-i-butylphenyl)-4,4′-biphenylenediphosphonite,
bis(2,4-di-i-butyl-6-methylphenyl)methyl phosphite, and
bis(2,4-di-i-butyl-6-methylphenyl)ethyl phosphite,
more preferably the antioxidant (F) is selected from
tris(2,4-di-i-butylphenyl)phosphite, bis(2,4-di-i-butyl-6-methylphenyl)ethyl phosphite, bis(2,4-di-i-butylphenyl) pentaerythritol diphosphite, and
tetrakis(2,4-di-i-butylphenyl)-4,4′-biphenylenediphosphonite,
most preferably the antioxidant (F) i

Assignees

• Sabic Global Technologies Bv

Inventors

• Van Mierloo Sarah
• SAMPERS Jacques Theodorus Elisabeth Hubertina

Classifications

• C08K5/524

  Esters of phosphorous acids, e.g. of H3PO3 · CPC title

• C08K3/34

  Silicon-containing compounds · CPC title

• C08L23/14

  Copolymers of propene (C08L23/16 takes precedence) · CPC title

• C08K5/37

  Thiols · CPC title

• C08K5/105

  with phenols · CPC title