Patent US4567106A successfully refreshed from Google Patents.
US4567106A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming a coating on polyolefin substrate
Assignee: DKS Co Ltd
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Filing: 1985-03-01
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Granted: 1986-01-28
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Expires: 2005-03-01
Abstract
Abstract A method of forming a coating on a polyolefin substrate comprising the steps of applying a primer coating onto the substrate and then applying a finish coating is disclosed. The method is characterized in that the primer coating consists essentially of a polyurethane prepolymer derived from a polypropylene glycol having a molecular weight from about 400 to about 2,000 and an excess of diphenylmethane diisocyanate.
Inventors
- 👤 Takashi Sano
- 👤 Kazuo Kawabata
- 👤 Yoji Miya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:06
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/50; B05D7/52; B05D7/54; B05D3/00; B05D3/08; B05D3/10; B05D3/101; B05D3/14; B05D3/141; B05D3/142; B05D3/144; B05D7/02; C; C08; C08J; C08J7/00; C08J7/04; C08J7/042; C08J7/043; B05D2201/00; B05D2503/00; B05D2504/00; C08J2323/00; C08J2323/02; C08J2475/00; C08J2475/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31551; Y10T428/31554; Y10T428/31573; Y10T428/31587
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
70 words
In a method of forming a coating on a polyolefin substrate comprising the steps of applying a primer coating onto the substrate and then applying a finish coating thereon, the improvement wherein said primer coating consists essentially of a polyurethane prepolymer containing a plurality of terminal free isocyanate groups derived from a polypropylene glycol having a molecular weight from about 400 to about 2,000 and an excess of diphenylmethane diisocyanate.
Claim 2
Dependent Claim
70 words
In a method of forming a coating on a polyolefin substrate comprising the steps of applying a primer coating onto the substrate and then applying a finish coating thereon, the improvement wherein said primer coating consists essentially of a polyurethane prepolymer containing a plurality of terminal free isocyanate groups derived from a polypropylene glycol having a molecular weight from about 400 to about 2,000 and an excess of diphenylmethane diisocyanate.
Claim 3
Dependent Claim
19 words
The method of claim 1, wherein said polypropylene glycol has a molecular weight from about 600 to about 1,500.
Claim 4
Dependent Claim
18 words
The method of claim 1, wherein the NCO/OH equivalent ratio of said prepolymer ranges from 1.2 to 4.0.
Claim 5
Dependent Claim
32 words
The method of claim 3 further comprising the step of subjecting the polyolefin substrate to flame treatment, corona discharge treatment or bichromate/sulfuric acid treatment prior to the application of said primer coating.
Claim 6
Dependent Claim
17 words
The method of claim 4, wherein said finish coating is an epoxy based or polyurethane based coating.
Claim 7
Dependent Claim
21 words
The method of claim 5, wherein said primer coating comprising a catalytically effective amount of a tertiary amine or organotin compound.
Claim 8
Dependent Claim
31 words
A plastic article comprising a polyolefin substrate having on a surface therefore a two-coat coating comprising a primer and a finish coat and produced according to the process of claim 1.
Claim 9
Dependent Claim
18 words
An article according to claim 7 wherein the finish coating is an epoxy based or polyurethane based coating.
Claim 10
Dependent Claim
13 words
An article according to claim 7 wherein the polyolefin substrate is low-density polyethylene.
Claim 11
Dependent Claim
26 words
An article according to claim 7 wherein the polyolefin substrate is low-density polyethylene and wherein the finish coating is an epoxy based or polyurethane based coating.
Claim 12
Dependent Claim
39 words
A plastic article comprising a low density polyethylene substrate having on the surface thereof a two-coat coating comprising a polyurethane primer coat and an epoxy or polyurethane based finish coat and produced according to the process of claim 4.
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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) | 1989-01-27 | 1989-07-29 | 1990-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-27 | 1993-07-29 | 1994-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-27 | 1997-07-29 | 1998-01-28 | $7700.00 | Window Closed / Lapsed |