US4938998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating the surface of a plastic article
Assignee: Individual
•
Filing: 1986-08-20
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Granted: 1990-07-03
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Expires: 2006-08-20
Abstract
Abstract A plastic article, especially of polypropylene or polyethylene, can be rendered resistant to diffusion of motor fuel vapors or the like and/or prepared for surface-coating by applying a film of a naturally-occurring, enzymatically-functionalized cellulose derivative having a functional phosphate, sulfate, carbonate or amino group.
Inventors
- 👤 Juergen Stock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:08
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; B; B32; B32B; B32B33/00; C08J7/043; C08J7/046; C08J7/048; C08J2401/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/14; Y10T428/1452; Y10T428/28; Y10T428/2852; Y10T428/2865; Y10T428/2878; Y10T428/31504; Y10T428/31511; Y10T428/31551; Y10T428/31573; Y10T428/31587; Y10T428/31855; Y10T428/3188; Y10T428/31884; Y10T428/31909; Y10T428/31913; Y10T428/8305
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
94 words
A process for treating the surface of a plastic article, comprising the steps of: dissolving a naturally-occurring, enzymatically-functionalized cellulose derivative having a functional phosphate, sulfate, carbonate or amino group in water to form a solution; adding to the solution of the cellulose derivative a monomer or polymer, which is capable of reacting with the functional group of the cellulose derivative and which is further capable of forming a matrix embedding the cellulose derivative; applying the solution to a surface of the plastic article; and drying the solution to form a film on said surface.
Claim 2
Dependent Claim
94 words
A process for treating the surface of a plastic article, comprising the steps of: dissolving a naturally-occurring, enzymatically-functionalized cellulose derivative having a functional phosphate, sulfate, carbonate or amino group in water to form a solution; adding to the solution of the cellulose derivative a monomer or polymer, which is capable of reacting with the functional group of the cellulose derivative and which is further capable of forming a matrix embedding the cellulose derivative; applying the solution to a surface of the plastic article; and drying the solution to form a film on said surface.
Claim 3
Dependent Claim
30 words
A process as claimed in claim 1, wherein said dissolution step includes adding an acid to the water in order to assist the dissolution of the cellulose derivative in water.
Claim 4
Dependent Claim
25 words
A process as claimed in claim 1, further comprising the step of adding a highly volatile organic solvent for adjusting the viscosity of the solution.
Claim 5
Dependent Claim
19 words
A process as claimed in claim 1, wherein a polyepoxide is added to the solution of the cellulose derivative.
Claim 6
Dependent Claim
26 words
A process as claimed in claim 4, further comprising the step of adding a hardener or reaction accelerator to control the reaction time of the polyepoxide.
Claim 7
Dependent Claim
13 words
A process as claimed in claim 1, wherein the cellulose derivative comprises chitosan.
Claim 8
Dependent Claim
18 words
A process as claimed in claim 1, wherein said plastic comprises a polyolefin selected from polyethylene and polypropylene.
Claim 9
Dependent Claim
25 words
A process as claimed in claim 7, further comprising the step of partially oxidizing the surface of said plastic article prior to said applying step.
Claim 10
Dependent Claim
25 words
A process as claimed in claim 8, wherein said step of partially oxidizing comprises applying a flame treatment to the surface of said plastic article.
Claim 11
Dependent Claim
31 words
A process as claimed in claim 1, further comprising, the step of applying a lacquer or paint layer over said dried film while the film is still in a tacky state.
Claim 12
Dependent Claim
28 words
A process as claimed in claim 1, further comprising, the step of applying an adhesive label over said film while the film is still in a tacky state.
Claim 13
Dependent Claim
11 words
A plastic article produced by the process defined by claim 1.
References Cited (Backward Citations)
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US3925302A
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US3914483A
Cited
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Cited
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Cited
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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) | 1993-07-02 | 1994-01-01 | 1994-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-02 | 1998-01-01 | 1998-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-02 | 2002-01-01 | 2002-07-03 | $7700.00 | Window Closed / Lapsed |