US4533566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron-beam adhesion-promoting treatment of polyester film base for silicone release liners
Assignee: 3M Co
•
Filing: 1984-07-05
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Granted: 1985-08-06
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Expires: 2004-07-05
Abstract
Abstract A silicone coating of a silicone release liner which has a polyester film base is better adhered to the film base and better resists removal when rubbed if the film base is first subjected to electron-beam irradiation while passing through an inert atmosphere such as nitrogen.
Inventors
- 👤 Jack L. Evans
- 👤 Karen J. Campbell
- 👤 Curtis L. Kreil
- 👤 LuAnn Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:41
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
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
112 words
In the manufacture of a release liner comprising a flexible polyester film base and a thin silicone coating, a method for promoting the adhesion to the polyester film base of the silicone coating, which method comprises the steps of (1) continuously passing uncoated polyester film base through an inert atmosphere containing less than 500 ppm oxygen while (2) exposing the film base to irradiation of an electron beam to subject the film base to an absorbed dosage of at least 2 Mrad, and (3) applying a thin silicone coating to a face of the film base to which adhesion of the coating has been enhanced by virtue of steps (1) and (2).
Claim 2
Dependent Claim
112 words
In the manufacture of a release liner comprising a flexible polyester film base and a thin silicone coating, a method for promoting the adhesion to the polyester film base of the silicone coating, which method comprises the steps of (1) continuously passing uncoated polyester film base through an inert atmosphere containing less than 500 ppm oxygen while (2) exposing the film base to irradiation of an electron beam to subject the film base to an absorbed dosage of at least 2 Mrad, and (3) applying a thin silicone coating to a face of the film base to which adhesion of the coating has been enhanced by virtue of steps (1) and (2).
Claim 3
Dependent Claim
14 words
Method as defined in claim 1 wherein the silicone is a solvent-free addition-cure silicone.
Claim 4
Dependent Claim
14 words
Method as defined in claim 1 wherein the dosage does not exceed 20 Mrad.
Claim 5
Dependent Claim
15 words
Method as defined in claim 3 wherein the dosage is from 5 to 10 Mrad.
Claim 6
Dependent Claim
13 words
Method as defined in claim 1 wherein the inert atmosphere is substantially nitrogen.
Claim 7
Dependent Claim
16 words
Method as defined in claim 1 wherein the inert atmosphere contains less than 40 ppm oxygen.
Claim 8
Dependent Claim
21 words
Method as defined in claim 6 wherein the polyester film base is at approximately atmospheric pressure during steps (1) and (2).
Claim 9
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 10
Dependent Claim
12 words
Method as defined in claim 1 wherein the polyester is polyethylene terephthalate.
Claim 11
Dependent Claim
33 words
Method as defined in claim 7 wherein the film base is unsupported while being irradiated in step (2) and the adhesion of silicone coatings to both faces of the film base is enhanced.
Claim 12
Dependent Claim
30 words
Method as defined in claim 1 wherein said silicone coating is applied in step (3) to the surface of the film base which faced the electron-beam radiation in step (2).
Claim 13
Dependent Claim
19 words
The method of claim 1 wherein the electron beam has an accelerating voltage of at least 150 kiloelectron volts.
Claim 14
Dependent Claim
13 words
The method of claim 1 wherein the film base is biaxially oriented polyester.
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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) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |