US4028332A
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US
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Stabilization of cross-linked polyolefins
Assignee: Phillips Petroleum Co
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Filing: 1975-10-14
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Granted: 1977-06-07
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Expires: 1995-10-14
Abstract
Abstract An improved stabilizer system for crosslinkable polyolefins consisting of a dialkyl pentaerythritol diphosphite and a sulfur-containing compound selected from the group consisting of the diester of thiodipropionic acid and a bis(3-hydroxy-4-alkyl-2,6-dimethylbenzyl) dithiolterephthalate, and an improved crosslinkable polyolefin composition comprising this stabilizer system.
Inventors
- 👤 Donald G. Needham
- 👤 Kenneth P. Taylor
- 👤 Claude V. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:25
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/372; C08K5/04; C08K5/14; C08K5/49; C08K5/51; C08K5/52; C08K5/527
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
181 words
A composition of matter comprising I. a solid polymer selected from the group consisting of ethylene homopolmers and copolymers of ethylene and at least one acyclic mono-1-olefin having from 3 to 8 carbon atoms per molecule, and mixtures thereof, wherein said copolymers contain from 75 to 99 weight percent of said ethylene; Ii. a crosslinking amount of an acetylenic diperoxy compound of the formula ##STR6## wherein n is an integer having a value of 1 or 2, m is an integer having a value of 0 or 1, and the sum of n + m is 1 or 2, and R'" is selected from the group consisting of tertiary alkyl having 4 to 8 carbon atoms, alkyl carbonate having 2 to 6 carbon atoms, haloalkyl carbonate having 2 to 6 carbon atoms, benzoate and lower alkyl-substituted benzoate; and Iii. a stabilizing amount of a stabilizer system consisting essentially of A. a dialkylpentaerythritol diphosphite having the formula ##STR7## wherein R is an alkyl radical having from 12 to 20 carbon atoms, and B. a sulfur-containing compound selected from the group consisting of
Claim 2
Dependent Claim
181 words
A composition of matter comprising I. a solid polymer selected from the group consisting of ethylene homopolmers and copolymers of ethylene and at least one acyclic mono-1-olefin having from 3 to 8 carbon atoms per molecule, and mixtures thereof, wherein said copolymers contain from 75 to 99 weight percent of said ethylene; Ii. a crosslinking amount of an acetylenic diperoxy compound of the formula ##STR6## wherein n is an integer having a value of 1 or 2, m is an integer having a value of 0 or 1, and the sum of n + m is 1 or 2, and R'" is selected from the group consisting of tertiary alkyl having 4 to 8 carbon atoms, alkyl carbonate having 2 to 6 carbon atoms, haloalkyl carbonate having 2 to 6 carbon atoms, benzoate and lower alkyl-substituted benzoate; and Iii. a stabilizing amount of a stabilizer system consisting essentially of A. a dialkylpentaerythritol diphosphite having the formula ##STR7## wherein R is an alkyl radical having from 12 to 20 carbon atoms, and B. a sulfur-containing compound selected from the group consisting of
Claim 3
Dependent Claim
66 words
a diester of thiodipropionic acid having the formula S(CH.sub.2 CH.sub.2 COOR').sub.2 wherein R' is an alkyl radical having 4 to 22 carbon atoms; and 2. a bis(3-hydroxy-4-alkyl-2,6-dimethylbenzyl) dithiolterephthalate of the formula ##STR8## wherein R" is a branched chain alkyl group having from 4 to 12 carbon atoms, wherein the weight ratio of compound (A) to compound (B) is in the approximate range of 3:1 to 1:3.
Claim 4
Dependent Claim
66 words
a diester of thiodipropionic acid having the formula S(CH.sub.2 CH.sub.2 COOR').sub.2 wherein R' is an alkyl radical having 4 to 22 carbon atoms; and 2. a bis(3-hydroxy-4-alkyl-2,6-dimethylbenzyl) dithiolterephthalate of the formula ##STR8## wherein R" is a branched chain alkyl group having from 4 to 12 carbon atoms, wherein the weight ratio of compound (A) to compound (B) is in the approximate range of 3:1 to 1:3.
Claim 5
Dependent Claim
24 words
The composition of claim 1 wherein the amount of said acetylenic diperoxy compound is in the approximate range of 0.1 to 10 weight percent.
Claim 6
Dependent Claim
28 words
The composition of claim 1 wherein the total amount of said compound (III-A) and said compound (III-B) is in the approximate range of 0.01 to 0.1 weight percent.
Claim 7
Dependent Claim
20 words
The composition of claim 1 wherein the weight ratio of said compound (III-A) to said compound (III-B) is about 1:1.
Claim 8
Dependent Claim
18 words
The composition of claim 1 wherein said compound (III-A) is octadecylpentaerythritol diphosphite and said compound (III-B) is dilaurylthiodipropionate.
Claim 9
Dependent Claim
19 words
The composition of claim 1 wherein said compound (III-A) is octadecylpentaerythritol diphosphite and said compound (III-B) is bis(4-t-butyl-3-hydroxy-2,6-dimethylbenzyl) dithiolterephthalate.
Claim 10
Dependent Claim
74 words
A stabilizer system for crosslinkable polyethylene which consists essentially of A. a dialkylpentaerythritol diphosphite having the formula ##STR9## wherein R is an alkyl radical having from 12 to 20 carbon atoms, and B. a bis(3-hydroxy-4-alkyl-2,6-dimethylbenzyl) dithiolterephthalate having the formula ##STR10## wherein R" is a branched chain alkyl group having from 4 to 12 carbon atoms, wherein the weight ratio of compound (A) to compound (B) is in the approximate range of 3:1 to 1:3.
Claim 11
Dependent Claim
74 words
A stabilizer system for crosslinkable polyethylene which consists essentially of A. a dialkylpentaerythritol diphosphite having the formula ##STR9## wherein R is an alkyl radical having from 12 to 20 carbon atoms, and B. a bis(3-hydroxy-4-alkyl-2,6-dimethylbenzyl) dithiolterephthalate having the formula ##STR10## wherein R" is a branched chain alkyl group having from 4 to 12 carbon atoms, wherein the weight ratio of compound (A) to compound (B) is in the approximate range of 3:1 to 1:3.
Claim 12
Dependent Claim
18 words
The system of claim 7 wherein the weight ratio of compound (A) to compound (B) is about 1:1.
Claim 13
Dependent Claim
19 words
The system of claim 7 wherein said compound (A) is octadecylpentaerythritol diphosphite and said compound (B) is bis(4-t-butyl-3-hydroxy-2,6-dimethylbenzyl) dithiolterephthalate.
References Cited (Backward Citations)
US3238178A
Cited
US3238176A
Cited
US3378516A
Cited
US3296189A
Cited
US3454523A
Cited
US3573251A
Cited
US3810929A
Cited
US3763095A
Cited
US3876613A
Cited
US3897388A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |