US4594262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron beam adhesion-promoting treatment of polyester film base
Assignee: 3M Co
•
Filing: 1985-06-17
•
Granted: 1986-06-10
•
Expires: 2005-06-17
Abstract
Abstract Organic coatings adhere better to polyester film base if the film base is first subjected to electron-beam irradiation while passing through an inert atmosphere such as nitrogen.
Inventors
- 👤 Curtis L. Kreil
- 👤 LuAnn Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:40
CPC Classifications
B; B05; B05D; B05D3/00; B05D3/06; B05D3/068; C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/046; G; G11; G11B; G11B5/00; G11B5/84; G11B5/8404; B05D2201/00; B05D2252/00; B05D2252/02; B29; B29C; B29C35/00; B29C35/02; B29C35/08; B29C35/0866; B29C2035/0877; B29K; B29K2995/00; B29K2995/0037; B29K2995/005; B29K2995/0053; C08J2367/00; C08J2367/02; C09; C09J; C09J2483/00; C09J2483/005
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
126 words
Method for coating a polyester film base with a curable organic coating, which method comprises the steps of: (1) continuously passing uncoated polyester film base, consisting essentially of saturated polyester, through an inert atmosphere containing less than 100 ppm oxygen while; (2) exposing the film base to irradiation by an electron beam to subject the film base to an absorbed dosage of at least 1 Mrad; and (3) applying a curable organic coating to the surface of the polyester film base; whereby the polyester film, after step (2), has been rendered substantially more adherent to organic coatings than such film which has not been so treated, and this greater adherence lasts for prolonged periods, of at least one week, during storage at room temperature in air.
Claim 2
Dependent Claim
126 words
Method for coating a polyester film base with a curable organic coating, which method comprises the steps of: (1) continuously passing uncoated polyester film base, consisting essentially of saturated polyester, through an inert atmosphere containing less than 100 ppm oxygen while; (2) exposing the film base to irradiation by an electron beam to subject the film base to an absorbed dosage of at least 1 Mrad; and (3) applying a curable organic coating to the surface of the polyester film base; whereby the polyester film, after step (2), has been rendered substantially more adherent to organic coatings than such film which has not been so treated, and this greater adherence lasts for prolonged periods, of at least one week, during storage at room temperature in air.
Claim 3
Dependent Claim
15 words
Method as defined in claim 1 wherein the dosage is from 1 to 20 Mrad.
Claim 4
Dependent Claim
15 words
Method as defined in claim 2 wherein the dosage is from 5 to 10 Mrad.
Claim 5
Dependent Claim
13 words
Method as defined in claim 1 wherein the inert atmosphere is substantially nitrogen.
Claim 6
Dependent Claim
16 words
Method as defined in claim 1 wherein the inert atmosphere contains less than 40 ppm oxygen.
Claim 7
Dependent Claim
20 words
Method as defined in claim 5 wherein the polyester film is at approximately atmospheric pressure during steps (1) and (2).
Claim 8
Dependent Claim
28 words
Method as defined in claim 1 wherein the polyester film base is continuously irradiated in step (2) at a web speed of at least 50 meters per minute.
Claim 9
Dependent Claim
12 words
Method as defined in claim 1 wherein the polyester is poly(ethylene terephthalate).
Claim 10
Dependent Claim
33 words
Method as defined in claim 8 wherein the film base is unsupported while being irradiated in step (2), and the adhesion of organic coatings to both faces of the film base is enhanced.
Claim 11
Dependent Claim
37 words
Method as defined in claim 8 wherein the polyester film base is cooled by a metal surface while being irradiated in step (2), and adhesion to only the noncontacting face of the film base is satisfactorily enhanced.
Claim 12
Dependent Claim
41 words
Method as defined in claim 1 wherein step (3) is followed by step (4) curing the curable organic coating, and wherein adhesion of the cured coating to the polyester film base has been enhanced by virtue of steps (1) and (2).
Claim 13
Dependent Claim
31 words
Method as defined in claim 11 wherein the curable organic coating is applied in step (3) to the surface of the film base which faced the electron-beam radiation in step (2).
Claim 14
Dependent Claim
18 words
Method as defined in claim 11 wherein the curable organic coating applied in step (3) is an adhesive.
Claim 15
Dependent Claim
26 words
Method as defined in claim 13 wherein said adhesive uncured epoxy adhesive which is cured to a resin after coating it onto the polyester film base.
Claim 16
Dependent Claim
41 words
Method as defined in claim 13 wherein two sections of polyester film base are adhered together by the adhesive cured in step (4), the adhesion of each of said sections of polyester film having been promoted by steps (1) and (2).
Claim 17
Dependent Claim
31 words
Method as defined in claim 15 wherein said two sections of polyester film base are at opposite ends of a rectangular piece of polyester film base, thus providing an endless belt.
Claim 18
Dependent Claim
15 words
Method as defined in claim 11 wherein the curable organic coating is an imaging coating.
Claim 19
Dependent Claim
14 words
Method as defined in claim 11 wherein the curable organic coating contains inorganic particles.
Claim 20
Dependent Claim
13 words
Method as defined in claim 18 wherein the inorganic particles are abrasive particles.
Claim 21
Dependent Claim
19 words
The method of claim 1 wherein the electron beam radiation has an accelerating voltage of at least 150 keV.
Claim 22
Dependent Claim
13 words
The method of claim 1 wherein the film base is biaxially oriented polyester.
Claim 23
Dependent Claim
28 words
The method of claim 1 wherein the curable organic coating is selected from the group consisting of phenoxy resins, polyurethanes, addition cure silicones, epoxy adhesives, and phenol--formaldehyde resins.
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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) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |