Heat sealing film

Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Adhesive outermost layer

Patent

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Details

428354, 428694ST, C09J 702

Patent

active

057630747

ABSTRACT:
The heat sealing film and a magnetic transfer strip contain an adhesive layer comprising thermoplastic, immiscible binder components. One component is spherical, amorphous and embedded in finely distributed form in a homogeneous layer of the other, highly crystalline components in such a way that the spherical component protrudes hemispherically from the layer. The spherical binder is a glassy solid up to at least 60.degree. C. and above 80.degree. C. is plastically deformable. The hemispheres protruding from the adhesive layer produce a uniform, fine roughness of the surface. Both heat sealing film and magnetic transfer strip are nonblocking up to at least 60.degree. C. and heat-sealable at temperatures greater than 80.degree. C. The adhesive layer imparts to a magnetic recording medium a uniform thickness of the adhesive joint and a permanent, temperature-resistant adhesive force.

REFERENCES:
patent: 4107380 (1978-08-01), Wiesman
patent: 4704325 (1987-11-01), Crocker
patent: 4880683 (1989-11-01), Stow
patent: 5185203 (1993-02-01), Itaba
patent: 5599621 (1997-02-01), Akhter
Jan M.G. Cowie, Chemie und Physik der Polymeren, New York, 1976, p. 297.

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