US3950206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for heat-bonding polyester films or sheet-like structures and said polyester films or sheet-like structures
Assignee: Teijin Ltd
•
Filing: 1973-12-10
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Granted: 1976-04-13
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Expires: 1993-12-10
Abstract
Abstract A method for heat bonding a polyester film directly with other film or shaped articles of polyester at a temperature below its melting point by using corona discharge treated polyester film, said polyester being predominantly alkylene terephthalate units and/or alkylene 2,6-naphthalate units and the film therefor.
Inventors
- 👤 Tomio Adachi
- 👤 Yukio Mitsuishi
- 👤 Rikuo Miura
- 👤 Hideaki Kawakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:23
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; C; C08; C08J; C08J5/00; C08J5/12; C08J5/121; B32B27/16; B32B27/36; B32B38/00; B32B38/0008; C08J7/00; C08J7/12; C08J7/123; C08L; C08L67/00; C08L67/02; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2310/00; B32B2310/14; C08J2367/00; C08J2367/02; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/31; Y10T428/31504; Y10T428/31725; Y10T428/31736; Y10T428/31739; Y10T428/31786; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31938
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
141 words
A process for heat-bonding polyester films or sheet-like structures which comprises subjecting to a corona discharge treatment one or both surfaces of a polyester selected from the group consisting of polyethylene terephthalate and polyethylene-2,6-naphthalate, bringing the treated surface or surfaces into direct contact with the surface or surfaces which may be treated of another film or preformed sheet-like structure of said polyester and heat-bonding said films at a temperature from 70°C. higher than the glass transition temperature of the polyester to 10°C. lower than its melting point and an external pressure in the range of 0.01 to 20 Kg/cm 2 , said corona discharge treatment being performed so that the treated structure has a contact angle of not more than (θ - 10°) and not less than (θ - 45°) wherein θ is the contact angle of the structure before treatment.
Claim 2
Dependent Claim
141 words
A process for heat-bonding polyester films or sheet-like structures which comprises subjecting to a corona discharge treatment one or both surfaces of a polyester selected from the group consisting of polyethylene terephthalate and polyethylene-2,6-naphthalate, bringing the treated surface or surfaces into direct contact with the surface or surfaces which may be treated of another film or preformed sheet-like structure of said polyester and heat-bonding said films at a temperature from 70°C. higher than the glass transition temperature of the polyester to 10°C. lower than its melting point and an external pressure in the range of 0.01 to 20 Kg/cm 2 , said corona discharge treatment being performed so that the treated structure has a contact angle of not more than (θ - 10°) and not less than (θ - 45°) wherein θ is the contact angle of the structure before treatment.
Claim 3
Dependent Claim
39 words
The method of claim 1 wherein said corona discharge treatment is performed so that the treated structure has a contact angle of not more than (θ - 5°) wherein θ is the contact angle of the structure before treatment.
Claim 4
Dependent Claim
20 words
The method of claim 1 wherein said polyester film or sheet-like structure is a biaxially oriented film or sheet-like structure.
References Cited (Backward Citations)
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US2876358A
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US3188265A
Cited
US3081214A
Cited
US3329549A
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US3647592A
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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) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |