US4772656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Volatile aromatic barrier for polyolefin containers
Assignee: Linwo Industries Ltd
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Filing: 1986-12-11
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Granted: 1988-09-20
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Expires: 2006-12-11
Abstract
Abstract A molded polyolefin container for hydrocarbons having improved barrier to permeation of fluid hydrocarbons through the walls of the container is disclosed. The container walls comprise from 0.1% to 2% by weight of aluminum powder in the polyolefin container walls. The aluminum powder is substantially uniformly distributed throughout the polyolefin container walls. The polyolefin may be polyprolylene or polyethylene. This type of container provides an economical packaging system for hydrocarbons compared to existing packages of metal or polyvinylchloride.
Inventors
- 👤 David J. Tanner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:20
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/08; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1355
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
44 words
A method of improving the resistance of a molded polyolefin container to permeation by a fluid hydrocarbon contained by the container, comprising: (a) uniformly distributing 0.1 to 2 wt.% aluminum powder throughout a polyolefin resin; and (b) molding the resin to form the container.
Claim 2
Independent Claim
44 words
A method of improving the resistance of a molded polyolefin container to permeation by a fluid hydrocarbon contained by the container, comprising: (a) uniformly distributing 0.1 to 2 wt.% aluminum powder throughout a polyolefin resin; and (b) molding the resin to form the container.
Claim 3
Dependent Claim
11 words
The method of claim 1, wherein the polyolefin resin comprises polypropylene.
Claim 4
Dependent Claim
11 words
The method of claim 1, wherein the polyolefin resin comprises polyethylene.
Claim 5
Dependent Claim
21 words
The method of claim 1, wherein the aluminum powder has a particle size in the range of 10 to 80 microns.
Claim 6
Dependent Claim
21 words
The method of claim 4, wherein the aluminum powder has a particle size in the range of 25 to 60 microns.
Claim 7
Dependent Claim
19 words
The method of claim 1, wherein 0.1 to 1 wt.% aluminum powder is uniformly distributed throughout the polyolefin resin.
Claim 8
Dependent Claim
19 words
The method of claim 1, wherein 0.2 to 0.5 wt.% aluminum powder is uniformly distributed throughout the polyolefin resin.
Claim 9
Dependent Claim
18 words
The method of claim 1, wherein about 0.5 wt.% aluminum powder is uniformly distributed throughout the polyolefin resin.
Claim 10
Dependent Claim
26 words
The method of claim 3, wherein the polyethylene is selected from the group consisting of low density, medium density, high density and super high density polyethylenes.
Claim 11
Dependent Claim
31 words
The method of claim 1, wherein the fluid hydrocarbon is selected from the group consisting of aromatic mineral spirits, solvents, Stoddart solutions, transmission fluids, power steering fluids and oil type hydrocarbons.
Claim 12
Dependent Claim
23 words
The method of claim 1, wherein the walls of the container have a thickness in the range of 0.015 inch to 0.060 inch.
Claim 13
Dependent Claim
20 words
The method of claim 11, wherein the container wall thickness is in the range of 0.025 inch to 0.050 inch.
Claim 14
Independent Claim
55 words
A method of improving the resistance of a molded polyolefin container to permeation by a fluid hydrocarbon contained by the container, comprising: (a) mixing 0.1 to 2 wt.% aluminum powder into a polyolefin resin until the powder is uniformly distributed throughout the resin; and (b) molding the power and resin mixture to form the container.
Claim 15
Independent Claim
55 words
A method of improving the resistance of a molded polyolefin container to permeation by a fluid hydrocarbon contained by the container, comprising: (a) mixing 0.1 to 2 wt.% aluminum powder into a polyolefin resin until the powder is uniformly distributed throughout the resin; and (b) molding the power and resin mixture to form the container.
References Cited (Backward Citations)
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CA796377A
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CA867812A
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US2054454A
Cited
SU621695A1
Cited
US4599376A
Cited
US4696857A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |