US3856747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Programmed degradation of polyolefins
Assignee: Mobil Oil AS
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Filing: 1972-08-07
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Granted: 1974-12-24
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Expires: 1992-08-07
Abstract
Abstract A method for programmed degradation of a polyolefin resin, containing a pro-degradant or a polyolefin resin containing a pro-degradant and a minor amount of a stabilizer incorporated therein during processing, by maintaining the resin in the presence of an atmosphere having a stabilizer in vaporized form, and a product comprising a polyolefin article (e.g., film), containing a pro-degradant or containing a pro-degradant and a minor amount of a stabilizer incorporated therein, in an enclosed atmosphere having in vaporized form a stabilizing agent whereby while exposed to said atmosphere the article containing the prodegradant is inhibited against degradation in a programmed manner.
Inventors
- 👤 D Dibiasi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:28
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K5/13; C08K5/36; C08K5/37; C08K5/39; C08K5/49; C08K5/51; C08K5/52; C08L; C08L2201/00; C08L2201/06; Y; Y10; Y10S; Y10S260/00; Y10S260/43
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
119 words
A METHOD OF INHIBITING THE DEGRADATION OF POLYOLEFIN RESINS, SAID RESINS HAVING INCORPORATED THREIN FROM ABOUT 50 PARTS/MILLION TO ABOUT 3,00 PARTS/MILLION, BASED ON THE WEIGHT OF THE POLYOLEFIN, OF A PRO-DEGRADANT SELCTECTED FROM THE GROUP CONSISTING OF MANGANESE DIOXIDE AND COBALT NAPTHENATE AND HAVING INCORPORATED DIRECTLY INTO THE POLYOLEFIN RESINS FROM ABOUT 50 PARTS/MILLION TO ABOUT 500 PARTS/MILLION BASED ON THE WEIGHT OF THE POLYOLEFIN, OF A VAPORIZABLE STABILIZER SELECTED FROM THE GROUP CONSISTING OF TETRAKIS (METHYLENE-(3,5-DI-TERTBUTYL-4-HYDROXYHYDROCINNAMATE) METHANE AND 1,1,3-TRIS-(2'',METHYL-4''-HYDROXY-5''-TERT-BUTYL PHENYL) BUTANE BY MAINTAINING SAID RESINS IN A CLOSED ATMOSPHERE AND/OR HAVING THEREIN AS A SEPARATE ENTITY A MINOR STABILIZING AMOUNT OF A VAPORIZABLE STABILIZER SELECTED FROM THE GROUP CONSISTING OF 2,6-DI-TERTBUTYL-P-CRESOL, TRIS-NONLPHENYL PHOSPHITE, ZINC, DIBUTYLDITHIOCARBAMATE AND DILAURYTHIODIPROPIONATE.
Claim 2
Independent Claim
119 words
A METHOD OF INHIBITING THE DEGRADATION OF POLYOLEFIN RESINS, SAID RESINS HAVING INCORPORATED THREIN FROM ABOUT 50 PARTS/MILLION TO ABOUT 3,00 PARTS/MILLION, BASED ON THE WEIGHT OF THE POLYOLEFIN, OF A PRO-DEGRADANT SELCTECTED FROM THE GROUP CONSISTING OF MANGANESE DIOXIDE AND COBALT NAPTHENATE AND HAVING INCORPORATED DIRECTLY INTO THE POLYOLEFIN RESINS FROM ABOUT 50 PARTS/MILLION TO ABOUT 500 PARTS/MILLION BASED ON THE WEIGHT OF THE POLYOLEFIN, OF A VAPORIZABLE STABILIZER SELECTED FROM THE GROUP CONSISTING OF TETRAKIS (METHYLENE-(3,5-DI-TERTBUTYL-4-HYDROXYHYDROCINNAMATE) METHANE AND 1,1,3-TRIS-(2'',METHYL-4''-HYDROXY-5''-TERT-BUTYL PHENYL) BUTANE BY MAINTAINING SAID RESINS IN A CLOSED ATMOSPHERE AND/OR HAVING THEREIN AS A SEPARATE ENTITY A MINOR STABILIZING AMOUNT OF A VAPORIZABLE STABILIZER SELECTED FROM THE GROUP CONSISTING OF 2,6-DI-TERTBUTYL-P-CRESOL, TRIS-NONLPHENYL PHOSPHITE, ZINC, DIBUTYLDITHIOCARBAMATE AND DILAURYTHIODIPROPIONATE.
Claim 3
Dependent Claim
37 words
The method of claim 1 wherein the polyolefin is selected from the group consisting of polyethylene, polypropylene, polybutylene and copolymers derived from a mixture of olefins selcted from the group consisting of ethylene, propylene, butene-1 and pentene-1.
Claim 4
Dependent Claim
10 words
The method of claim 2 wherein the polyolefin is polyethylene.
Claim 5
Dependent Claim
15 words
A polyolefin article comprising a polyolefin resin and vaporizable stabilizers as defined in claim 1.
Claim 6
Dependent Claim
37 words
The article of claim 4 wherein the polyolefin is selected from the group consisting of polyethylene, polypropylene, polybutylene and copolymers derived from a mixture of olefins selected from the group consisting of ethylene, propylene, butene-1 and pentene-1.
Claim 7
Dependent Claim
12 words
The article of claim 4 wherein said article is a polyethylEne film.
Claim 8
Dependent Claim
21 words
A closed package containing a polyolefin article as defined in claim 4 wherein said vaporizable stabalizing agent is in vaporized form.
Claim 9
Dependent Claim
23 words
The package of claim 7 wherein the vaporizable stabilizing agent as a separate entity is painted on the inner surface of the package.
Claim 10
Dependent Claim
19 words
The package of claim 7 wherein the vaporizable stabilizing agent is present inside the package in a pouch-like container.
Claim 11
Dependent Claim
29 words
The package of claim 7 containing polyolefin bags in said closed atmosphere wherein the vaporizable stabilizing agent is impregnated in twist ties as a closure means for such bags.
Claim 12
Dependent Claim
31 words
The method of claim 1 wherein the vaporizable stabilizers as described therein are incorporated directly into the polyolefin resins and are also present in said closed atmosphere as a separate entity.
Claim 13
Dependent Claim
31 words
The article of claim 4 wherein the vaporizable stabilizers as described therein are incorporated directly into the polyolefin resins and are also present in said closed atmosphere as a separate entity.
Claim 14
Dependent Claim
31 words
The package of claim 7 wherein the vaporizable stabilizers as described therein are incorporated directly into the polyolefin resins and are also present in said closed atmosphere as a separate entity.
References Cited (Backward Citations)
US3349018A
Cited
US3454510A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |