Claims
- 1. A stabilizing composition for thermoplastic polyolefin polymers, comprising:
- a) a sterically hindered antioxidant phenol chosen from:
- pentaerythritol-tetra(3-(3,5-di-tert-butyl-4-hydroxy-phenyl) propionate); n-octadecyl ester of .beta.-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid;
- 1,3,5-tris(3',5'-di-tert-butyl-4-hydroxybenzyl)isocyanurate;
- 1. 3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene;
- ethyleneglycol-bis(3,3-bis-3'-tert-butyl-4'-hydroxyphenyl)butyrate; and
- hexamethylene-1,6-di(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate;
- b) a triarylphosphite of general formula: ##STR2## where: R.sub.1 represents the tert-butyl or 1,1-dimethylpropyl group; and
- R.sub.2 represents the methyl, tert-butyl or 1,1-dimethyl propyl group; and
- c) a dialkylthiodipropionate containing from 10 to 20 carbon atoms in each alkyl portion;
- wherein the weight ratio ((b)+(c))/(a) varies from about 50:50 to 80:20, the weight ratio (b)/(c) varies from about 99:1 to 95:5, and the weight ratio (a)/(b) is about 1:1 to 1:2.
- 2. A composition as defined in claim 1, wherein the weight ratio of (b)/(c) varies from about 98:2 to 95:5.
- 3. A composition as defined in claim 2, wherein the sterically hindered antioxidant phenol is pentaerythritol-tetra(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate).
- 4. A composition as defined in claim 2, wherein the sterically hindered antioxidant phenol is n-octadecyl ester of .beta.-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid.
- 5. A composition as defined in claim 2, wherein the sterically hindered antioxidant phenol is 1,3,5-tris(3',5'-di-tert-butyl-4-hydroxybenzyl)isocyanuarate.
- 6. A composition as defined in claim 2, wherein the sterically hindered antioxidant is 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)trimethylbenzene.
- 7. A composition as defined in claim 2, wherein the sterically hindered antioxidant phenol is ethyleneglycol-bis(3,3-bis-3'-tert-buty-4'-hydroxyphenyl)butyrate.
- 8. A composition as defined in claim 2, wherein the sterically hindered antioxidant phenol is hexamethylene-1,1-di(3-5-di-tert-butyl-4-hydroxyphenyl)propionate.
- 9. A polymer composition which consists essentially of a thermoplastic organic polymer and from 0.01-5.0% by weight of the stabilizing composition of claim 1.
- 10. A polymer composition as defined in claim 9, wherein the polymer is polypropylene.
- 11. A polymer composition as defined in claim 10, wherein the polymer is polyethylene.
Priority Claims (1)
Number |
Date |
Country |
Kind |
19508 |
Feb 1988 |
ILX |
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Parent Case Info
This is a continuation of application Ser. No. 530,160 filed May 29, 1990, now abandoned which is in turn a continuation of application Ser. No. 308,323, filed Feb. 9, 1989, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (8)
Number |
Date |
Country |
227948 |
Jul 1987 |
EPX |
42-8689 |
Apr 1967 |
JPX |
43-15685 |
Jul 1968 |
JPX |
46-32861 |
Sep 1971 |
JPX |
56-152864 |
Nov 1981 |
JPX |
58-142924 |
Aug 1983 |
JPX |
1078772 |
Aug 1967 |
GBX |
1490938 |
Nov 1977 |
GBX |
Non-Patent Literature Citations (3)
Entry |
F. Mitterhofer, "Processing Stability", Polymer Enp. & Sci., Mid Jul. 1980, vol. 20, pp. 692-695. |
George K. Cowell-Plastics Engineering, pp. 51-57 (Oct. 1976). |
Henman, "Meet Stabilization of Polypropylene", Developments in Polymer Stabilization-1, pp. 39, 77 to 83, 92 to 95 (1979). |
Continuations (2)
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Number |
Date |
Country |
Parent |
530160 |
May 1990 |
|
Parent |
308323 |
Feb 1989 |
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