Claims
- 1. A stabilized composition consisting essentially of (a) a polymer that is derived from a singly unsaturated acyclic hydrocarbon, or mixtures or copolymers thereof; and (b) from 0.005 to 5% of a mixture of (1) a triarylphosphite of the general formula ##STR4## wherein R.sub.1 is tert.butyl or 1,1-dimethylpropyl, and R.sub.2 is methyl, tert.butyl or 1,1-dimethylpropyl, and (2) a hindered phenolic antioxidant selected from the group consisting of 2,6-di-tert.butyl-4-methylphenol, 2,2'-methylene-bis(6-tert.butyl-4-methylphenol), 2,2'-methylene-bis(6-tert.butyl-4-ethylphenol), 2,2'-methylene-bis(4-methyl-6-.alpha.-methylcyclohexyl) phenol, 1,1,3-tris(5-tert.butyl-4-hydroxy-2-methylphenyl) butane, 4,4'-thiobis(6-tert.butyl-3-methylphenol), 3,5-di-tert.butyl-4-hydroxybenzyl-phosphonic acid diethylester, N,N'-di-(3,5-di-tert.butyl-4-hydroxyphenylpropionyl)-hexamethylenediamine, 1,2-bis(3,5-di-tert.butyl-4-hydroxyphenyl-propionyloxy)-ethane, 1,5-bis(3,5-di-tert.butyl-4-hydroxyphenyl-propionyloxy)-2-thiapentane, 1,3-bis(3,5-di-tert.butyl-4-hydroxyphenyl-propionyloxy)-2,2-dimethylpropane and 1,1-bis(5-tert.butyl-4-hydroxy-2-methylphenyl)-butane; the ratio of the phosphite to the antioxidant being from 10:1 to 1:5.
- 2. The composition of claim 1, wherein said phosphite is tris(2,4-di-tert.butylphenyl)-phosphite.
- 3. The composition of claim 1, wherein said phosphite is tris(2-tert.butyl-4-methylphenyl)-phosphite.
- 4. The composition of claims 1, 2 or 3, wherein said phenol is 2,6-di-tert.butyl-4-methylphenol.
- 5. The composition of claim 1, wherein said polymer is polyethylene or polypropylene.
- 6. The composition of claim 4, wherein said polymer is polyethylene or polypropylene.
- 7. A method of stabilizing polymers derived from singly unsaturated, acyclic hydrocarbons or mixtures or copolymers thereof, which comprises incorporating in said polymer from 0.005 to 5% of mixture (b) according to claim 1.
- 8. The method of claim 7, wherein said phosphite is tris-(2,4-di-tert.butylphenyl)-phosphite.
- 9. The method of claim 7, wherein said phosphite is tris(2-tert.butyl-4-methylphenyl)-phosphite.
- 10. The method of claims 7, 8 or 9, wherein said phenol is 2,6-di-tert.butyl-4-methylphenol.
- 11. The method of claim 7, wherein said polymer is polyethylene or polypropylene.
- 12. The method of claim 10, wherein said polymer is polyethylene or polypropylene.
Priority Claims (2)
Number |
Date |
Country |
Kind |
2155/75 |
Feb 1975 |
CHX |
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12231/75 |
Sep 1975 |
CHX |
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Parent Case Info
This is a Continuation of application Ser. No. 802,921 filed on June 2, 1977, now U.S. Pat. No. 4,187,212, which in turn is a continuation of application Ser. No. 658,312, filed Feb. 17, 1976, now abandoned.
US Referenced Citations (24)
Foreign Referenced Citations (9)
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Continuations (2)
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Number |
Date |
Country |
Parent |
802921 |
Jun 1977 |
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Parent |
658312 |
Feb 1976 |
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