US4151136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid reactable inorganic mineral fillers having improved compatibility with polyolefin resins
Assignee: PLASTIC PACKAGING PRODUCTS Co A CORP OF DELAWARE
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Filing: 1978-03-16
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Granted: 1979-04-24
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Expires: 1998-03-16
Abstract
Abstract Mineral fillers reactable with acids such as metal carbonates such as CaCO 3 are rendered more compatible with polyolefin resins such as polyethylene by first reacting the filler with a long chain carboxylic acid to form a surface film of the acid. The acid reacted filler is contacted with a vinyl ester of the acid which is then polymerized in the presence of a free radical catalyst such as benzoyl peroxide to encapsulate the acid reacted filler in a coating of the polymerized ester.
Inventors
- 👤 Stephen W. Cornell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:51
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/02; C09C1/021; C08; C08F; C08F292/00; C08K; C08K9/00; C08K9/04; C08K9/10; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/80; Y; Y10; Y10S; Y10S260/00; Y10S260/37
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
87 words
A food container formed from a polyolefin having intimately incorporated therein a coated filler prepared by the sequential steps of reacting an inorganic, acid reactable mineral filler with a long chain carboxylic acid having 8 to 22 carbon atoms to form an acid reacted filler surface, contacting the acid reacted filler with a vinyl ester of a long chain carboxylic acid having 8 to 22 carbon atoms and then polymerizing the vinyl ester to encapsulate the acid reacted filler with a polymerized coating of the vinyl ester.
Claim 2
Dependent Claim
87 words
A food container formed from a polyolefin having intimately incorporated therein a coated filler prepared by the sequential steps of reacting an inorganic, acid reactable mineral filler with a long chain carboxylic acid having 8 to 22 carbon atoms to form an acid reacted filler surface, contacting the acid reacted filler with a vinyl ester of a long chain carboxylic acid having 8 to 22 carbon atoms and then polymerizing the vinyl ester to encapsulate the acid reacted filler with a polymerized coating of the vinyl ester.
Claim 3
Dependent Claim
24 words
The container of claim 1 wherein the filler is a carbonate salt of a metal of Group 2 of the Periodic Table of Elements.
Claim 4
Dependent Claim
13 words
The container of claim 1 wherein the carbonate salt is CaCO 3 .
Claim 5
Dependent Claim
12 words
The container of claim 1 wherein the carboxylic acid is stearic acid.
Claim 6
Dependent Claim
12 words
The container of claim 1 wherein the vinyl ester is vinyl stearate.
Claim 7
Dependent Claim
10 words
The container of claim 1 wherein the polyolefin is polyethylene.
References Cited (Backward Citations)
GB905069A
Cited
US3084117A
Cited
US3272772A
Cited
US3519593A
Cited
US3463350A
Cited
US3668038A
Cited
JPS4831747A
Cited
US3803065A
Cited
US3923190A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |