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US5500459A
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Heat-sealing of semicrystalline polymers with metals
Assignee: BASF Magnetics GmbH
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Filing: 1995-06-30
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Granted: 1996-03-19
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Expires: 2015-06-30
Abstract
Abstract Semicrystalline polymers are heat-sealed with metals under pressure and at a temperature between the glass transition temperature and the softening temperature of the polymer by prior exposure of the polymer surface to UV radiation produced by the decomposition of excimers in the wavelength range of from 120 to 400 nm and with an energy density below the ablation threshold.
Inventors
- 👤 Alfred Hagemeyer
- 👤 Hartmut Hibst
- 👤 Dieter Baeuerle
- 👤 Johannes Heitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:37
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/12; C08J5/121; B; B29; B29C; B29C59/00; B29C59/16; B29C65/00; B29C65/02; B29C65/14; B29C65/1403; B29C65/1406; B29C65/16; B29C65/1603; B29C65/1606; B29C65/82; B29C65/8207; B29C65/8223; B29C66/00; B29C66/70; B29C66/71; B29C66/712; B29C66/73; B29C66/737; B29C66/7377; B29C66/73773; B29C66/739; B29C66/7392; B29C66/74; B29C66/742; B29C66/90; B29C66/91; B29C66/914; B29C66/9141; B29C66/91411; B29C66/919; B29C66/9192; B29C66/91921; B29C66/91941; B29C66/91943; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0827; B29C2035/0838; B29C65/1629; B29C65/1632; B29C66/001; B29C66/0012; B29C66/0014; B29C66/00145; B29C66/01; B29C66/02; B29C66/731; B29C66/7311; B29C66/73117; B29C66/7422; B29C66/7428; B29C66/74281; B29C66/74283; B29C66/74285; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31605; Y10T428/31678; Y10T428/31681; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
74 words
A process for heat-sealing semicrystalline polymers with bonded metal which comprises: exposing the surface of the semicrystalline polymers to UV radiation produced by the decomposition of excimers in the wavelength range of from 120 to 400 nm with an energy density below the ablation threshold and thereafter bonding metal to the treated surface of the polymers under pressure and at a temperature between the glass transition temperature and the softening temperature of the polymer.
Claim 2
Dependent Claim
74 words
A process for heat-sealing semicrystalline polymers with bonded metal which comprises: exposing the surface of the semicrystalline polymers to UV radiation produced by the decomposition of excimers in the wavelength range of from 120 to 400 nm with an energy density below the ablation threshold and thereafter bonding metal to the treated surface of the polymers under pressure and at a temperature between the glass transition temperature and the softening temperature of the polymer.
Claim 3
Dependent Claim
21 words
A process as defined in claim 1, wherein the exposure to UV radiation is carried out using a UV excimer laser.
Claim 4
Dependent Claim
22 words
A process as claimed in claim 1, wherein the exposure to UV radiation is carried out using an incoherent UV excimer lamp.
Claim 5
Dependent Claim
29 words
The process of claim 1, wherein the semicrystalline polymers are selected from the group consisting of polyethylene terephthalate, polyimide, polyethylene naphthalate, polyamide, polybutylene terephthalate, polyacrylonitrile, poly-p-phenylene, polyurethane and polysulfone.
Claim 6
Dependent Claim
19 words
The process of claim 4, wherein the metal to be bonded is in the form of coherent metal layers.
Claim 7
Dependent Claim
15 words
The process of claim 5, wherein the metal layers are cobalt containing or cobalt/chromium-containing layers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-03-19 | 1999-09-18 | 2000-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-19 | 2003-09-18 | 2004-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-19 | 2007-09-18 | 2008-03-19 | $7700.00 | Window Closed / Lapsed |