Patent US4806296A successfully refreshed from Google Patents.
US4806296A
Expired / Lapsed
US
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Process of modifying polymers to produce a more readily paintable surface
Assignee: Dow Chemical Co
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Filing: 1987-08-19
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Granted: 1989-02-21
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Expires: 2007-08-19
Abstract
Abstract Polymeric articles made of, for example, polyethylene and copolymers of ethylene, are made more adherent to paint or dyes by first nitrating the polymer, then shaping or forming it in a mould having a polar surface and finally, cooling it in contact with that surface, or extruding a nitrated polymer onto a polar surface and allowing to cool in contact with that surface.
Inventors
- 👤 Steven L. Brewster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:48
CPC Classifications
C; C08; C08J; C08J5/00; C08F; C08F8/00; C08F8/30; B; B29; B29K; B29K2023/00; B29K2023/04; B29K2023/06
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
51 words
A process of producing an article of a polymer which has a more readily paintable surface which comprises the steps of (a) nitrating the polymer, (b) heating and forming the polymer into an article, (c) cooling the article while the surface of said article is in contact with a polar material.
Claim 2
Dependent Claim
51 words
A process of producing an article of a polymer which has a more readily paintable surface which comprises the steps of (a) nitrating the polymer, (b) heating and forming the polymer into an article, (c) cooling the article while the surface of said article is in contact with a polar material.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the polymer of step (a) is a polyethylene.
Claim 4
Dependent Claim
13 words
The process of claim 2 wherein the polyethylene is a low density material.
Claim 5
Dependent Claim
15 words
The process of claim 3 wherein the polymer contains a minor amount of a comonomer.
Claim 6
Dependent Claim
11 words
The process of claim 4 wherein the comonomer is vinyl acetate.
Claim 7
Dependent Claim
13 words
The process of claim 2 wherein the polyethylene is a high density material.
Claim 8
Dependent Claim
17 words
The process of claim 6 wherein the high density material has a Mw of more than 100,000.
Claim 9
Dependent Claim
12 words
The process of claim 2 wherein the polar material is a polyester.
Claim 10
Dependent Claim
11 words
The process of claim 8 wherein the polyester is polyethylene terphthalate.
Claim 11
Dependent Claim
12 words
The process of claim 2 wherein the polar material is a polyimide.
Claim 12
Dependent Claim
43 words
A process of producing a more readily paintable surface of a polymer article which comprises the steps of (a) nitrating a polymer, (b) heating and forming said nitrated polymer against a polar surface and (c) cooling prior to removing from said polar surface.
Claim 13
Dependent Claim
43 words
A process of producing a more readily paintable surface of a polymer article which comprises the steps of (a) nitrating a polymer, (b) heating and forming said nitrated polymer against a polar surface and (c) cooling prior to removing from said polar surface.
Claim 14
Dependent Claim
13 words
The process of claim 11 wherein the nitrated polymer is a nitrated polyethylene.
Claim 15
Dependent Claim
14 words
The process of claim 12 wherein the nitrated polyethylene is a high density material.
Claim 16
Dependent Claim
17 words
The process of claim 13 wherein the high density material has a Mw of more than 100,000.
Claim 17
Dependent Claim
12 words
The process of claim 11 wherein the polar surface is a polyester.
Claim 18
Dependent Claim
11 words
The process of claim 15 wherein the polyester is polyethylene terphthalate.
Claim 19
Dependent Claim
14 words
The process of claim 11 wherein the nitrated polyethylene is a low density material.
Claim 20
Dependent Claim
15 words
The process of claim 17 wherein the polymer contains a minor amount of a comonomer.
Claim 21
Dependent Claim
11 words
The process of claim 18 wherein the comonomer is vinyl acetate.
Claim 22
Dependent Claim
12 words
The process of claim 14 wherein the polar surface is a polyester.
Claim 23
Dependent Claim
11 words
The process of claim 20 wherein the polyester is polyethylene terphthalate.
Claim 24
Dependent Claim
51 words
A process of producing a more readily paintable surface of a polymer article which comprises the steps of heating and extruding a nitrated polymer onto a material having a polar surface and allowing the extruded polymer to cool in contact with said surface and subsequently forming an article from said polymer.
Claim 25
Dependent Claim
51 words
A process of producing a more readily paintable surface of a polymer article which comprises the steps of heating and extruding a nitrated polymer onto a material having a polar surface and allowing the extruded polymer to cool in contact with said surface and subsequently forming an article from said polymer.
Claim 26
Dependent Claim
12 words
The process of claim 22 wherein the nitrated polymer is a polyethylene.
Claim 27
Dependent Claim
13 words
The process of claim 23 wherein the polyethylene is a low density material.
Claim 28
Dependent Claim
15 words
The process of claim 24 wherein the polymer contains a minor amount of a comonomer.
Claim 29
Dependent Claim
11 words
The process of claim 25 wherein the comonomer is vinyl acetate.
Claim 30
Dependent Claim
13 words
The process of claim 22 wherein the polyethylene is a high density material.
Claim 31
Dependent Claim
17 words
The process of claim 27 wherein the high density material has a Mw of more than 100,000.
Claim 32
Dependent Claim
12 words
The process of claim 22 wherein the polar surface is a polyester.
Claim 33
Dependent Claim
11 words
The process of claim 29 wherein the polyester is polyethylene terphthalate.
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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) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |