Voided polyester film

Details Voided polyester film Voided polyester film

2006-01-10

2006-01-10

Walker, W. L. (Department: 1723)

Liquid purification or separation

Filter

Material

C210S500270, C210S488000, C210S490000, C428S141000, C428S317900, C428S304400, C428S318400, C428S319100, C428S319300

Reexamination Certificate

active

06984322

ABSTRACT:
The present invention relates to a biaxially stretched, laminated, white microporous polyester film, which can be used in a wide range of industrial applications including printing, imaging, advertising and display. The film of the present invention comprises a porous polyester resin layer B containing a thermoplastic resin non-compatible with polyester; a polyester resin-based photic layer A formed on one surface of the resin layer B, the photic layer A having a 60-degree gloss of the surface thereof of more than 100%; and an aphotic layer C formed on the other surface of the resin layer B, the aphotic layer C having a 60-degree gloss of the surface thereof of less than 50%. The total density of the photic layer A and the aphotic layer C is 0.55–1.2 g/cm3. This film has excellent gloss and flexibility so that it is very suitable for use in printing and imaging.

REFERENCES:
patent: 3928697 (1975-12-01), Mallinson et al.
patent: 6709731 (2004-03-01), Murschall et al.
patent: 2001/0031802 (2001-10-01), Murschall et al.
patent: WO 200160900 (2001-08-01), None
Ullmann's Encyclopedia of Industrial Chemistry, VCH, D-6940 Weinheim, vol. A11, (1988).

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