Polymeric film

Details Polymeric film Polymeric film

1996-04-30

1999-05-18

Chen, Vivian

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428219, 428328, 428341, 428355AC, 428480, 428522, 428910, 428483, 428914, B32B27/08;27/20;27/30;27/36

Patent

active

059049766

DESCRIPTION:

BRIEF SUMMARY
This invention relates to a polymeric film, and in particular to a composite polymeric film.
It is known that polymeric films can be rendered opaque or translucent by the incorporation therein of opacifying agents, particularly inorganic white fillers or pigments such as titanium dioxide and/or inorganic voiding fillers such as barium sulphate and/or organic voiding fillers such as incompatible resins.
Polymeric films generally possess poor adhesion to inks and lacquers. Polymeric films exhibiting good adhesion to a range of inks and lacquers are required in many applications, such as graphic arts, packaging and membrane touch switches. In particular, a translucent polymeric film having good adhesion to printing inks is required for use as an upper sheet material in re-usable labels, for example, for video cassettes and floppy discs. The re-usable label operates by means of the so-called "magic-slate" principle, whereby visible writing is produced by using a suitable pointed instrument to apply pressure to an upper translucent sheet of a re-usable label in order that the sheet comes into contact with a wax layer on a lower sheet of the re-usable label. The writing is erased by lifting the upper sheet away from the lower sheet. Unfortunately upper sheets of commercially available re-usable labels tend to suffer from unwanted permanent marking on repeated use. There is a requirement to improve the quality of the writing, in particular the sharpness of the lines, produced on a re-usable label. The quality of the writing is dependant, inter alia, on the adhesion between the wax layer on the lower sheet and the bottom surface of the upper sheet.
We have now devised a polymeric film which reduces or substantially overcomes one or more of the aforementioned problems.
Accordingly, the present invention provides a polymeric film comprising a translucent first layer of polymeric material, the first layer having on at least one surface thereof a transparent second layer of polymeric material, the second layer having on a surface thereof remote from the first layer, an adherent layer comprising an acrylic resin.
The invention also provides a method of producing a polymeric film which comprises forming a translucent first layer of polymeric material, forming a transparent second layer of polymeric material on at least one surface of the first layer, and applying an adherent layer comprising an acrylic resin to a surface of the second layer remote from the first layer.
The invention further provides the use of a polymeric film comprising a translucent first layer of polymeric material, the first layer having on at least one surface thereof a transparent second layer of polymeric material, the second layer having on a surface thereof remote from the first layer, an adherent layer comprising an acrylic resin, as an upper sheet in a re-usable label.
The polymeric film is a self-supporting film, ie a self-supporting structure capable of independent existence in the absence of a supporting base.
The polymeric film first layer or substrate according to the invention may be formed from any synthetic, film-forming polymeric material. Suitable thermoplastics materials include a homopolymer or copolymer of a 1-olefine, such as ethylene, propylene and but-1-ene, a polyamide, a polycarbonate, and, particularly, a synthetic linear polyester which may be obtained by condensing one or more dicarboxylic acids or their lower alkyl (up to 6 carbon atoms) diesters, eg terephthalic acid, isophthalic acid, phthalic acid, 2,5- 2,6- or 2,7-naphthalenedicarboxylic acid, succinic acid, sebacic acid, adipic acid, azelaic acid, 4,4'-diphenyldicarboxylic acid, hexahydroterephthalic acid or 1,2-bis-p-carboxyphenoxyethane (optionally with a monocarboxylic acid, such as pivalic acid) with one or more glycols, particularly aliphatic glycols, eg ethylene glycol, 1,3-propanediol, 1,4-butanediol, neopentyl glycol and 1,4-cyclohexanedimethanol. A polyethylene terephthalate or polyethylene naphthalate film is preferred. A polyethylene terephthalate film is

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Derwent Publications Ltd., London, GB; AN 82-08495J and JP A 57 181 861 Mitsubishi Petrochemical KK. Nov. 27, 1991.

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