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US 5,500,459 AGranted
Heat-sealing of semicrystalline polymers with metals
AssigneeBASF Magnetics GmbH
InventorsAlfred Hagemeyer, Hartmut Hibst, Dieter Baeuerle, Johannes Heitz
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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.
Claims6
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.
Dependencies are inferred from the claim text.