US4472467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer surface treating method
Assignee: Fujifilm Holdings Corp
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Filing: 1983-09-14
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Granted: 1984-09-18
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Expires: 2003-09-14
Abstract
Abstract The present invention relates to a method for treating the surface of a polymer web comprising: (1) heating a polymer web by vacuum glow discharge treatment; and (2) cooling the resulting polymer web of step (1) at a higher temperature than the glass transition point of the polymer such that T n ≧T n-1 -40, wherein n is a positive integer, T 0 is the initial temperature (°C.) of the polymer web immediately after the vacuum glow discharge treatment of step (1) and T n is the temperature (°C.) of the polymer web that has been drawn past the nth cooling roll.
Inventors
- 👤 Hiroyuki Tamaki
- 👤 Sumitaka Tatsuta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:56
CPC Classifications
B; B29; B29C; B29C59/00; B29C59/14; B29C35/00; B29C35/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
98 words
A method for treating the surface of a polymer web comprising: (1) heating a polymer web by vacuum glow discharge treatment; and (2) cooling the resulting polymer web of step (1) at a temperature higher than the glass transition point of the polymer such that T n ≧T n-1 -40, wherein n is a positive integer, T 0 is the initial temperature (°C. ) of the polymer web immediately after the vacuum glow discharge treatment of step (1) and T n is the temperature (°C.) of the polymer web that has been drawn past the nth cooling roll.
Claim 2
Independent Claim
98 words
A method for treating the surface of a polymer web comprising: (1) heating a polymer web by vacuum glow discharge treatment; and (2) cooling the resulting polymer web of step (1) at a temperature higher than the glass transition point of the polymer such that T n ≧T n-1 -40, wherein n is a positive integer, T 0 is the initial temperature (°C. ) of the polymer web immediately after the vacuum glow discharge treatment of step (1) and T n is the temperature (°C.) of the polymer web that has been drawn past the nth cooling roll.
Claim 3
Dependent Claim
30 words
The method as in claim 1 wherein when T n is lower than the glass transition point of the polymer, the polymer web may be immediately cooled to room temperature.
Claim 4
Dependent Claim
32 words
The method as in claim 1 wherein the diameter of each cooling roll is such that each cooling roll is kept in contact with the polymer web for at least 1.5 seconds.
Claim 5
Dependent Claim
36 words
The method as in claim 1 wherein said vacuum glow discharge treatment is conducted in an atmosphere produced by gas emitted from the web while it is exposed to an activated plasma shielded from external air.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |