Composite polyester films and process for producing the same

Details Composite polyester films and process for producing the same Composite polyester films and process for producing the same

1974-06-04

1976-09-28

Ansher, Harold

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

264172, 428409, 428480, 428900, 428910, B32B 3300, B32B 2718, B32B 2736

Patent

active

039832856

ABSTRACT:
A monoaxially or biaxially drawn composite polyester film comprising at least two layers of polyesters having different physical properties. At least one polyester layer is produced utilizing a catalytic system wherein the catalyst residue is insoluble in the polymer and at least one other polyester layer is produced using a catalyst system wherein the catalytic residue is soluble or only slightly insoluble in the polyester. A process for producing such composite polyester film comprises coextruding at least two polyester polymers into a layered film, one of these polyester layers containing crystallization sites in the form of the residue of the interchange catalyst used to form the polyester, and at least one polyester layer comprising a polyester wherein the interchange catalyst system is soluble or only slightly insoluble in the polyester; and drawing the layered film either monoaxially or biaxially.
These films have particular utility as support for magnetic recording tapes wherein one face of the film to be coated is smooth and the opposite face (undersurface) of the film has surface roughness.

REFERENCES:
patent: 3022192 (1962-02-01), Brandt
patent: 3515626 (1970-06-01), Duffield
patent: 3574048 (1971-04-01), Klimisch
patent: 3645822 (1972-02-01), Widiger et al.
patent: 3790653 (1974-02-01), Barkey et al.
patent: 3823947 (1974-07-01), Sasaki et al.

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