Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having a component wherein a constituent is liquid...
Patent
1987-08-14
1988-12-27
Kittle, John E.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having a component wherein a constituent is liquid...
428206, 428207, 428330, 428331, 4284763, 428483, 428520, B41M 5025
Patent
active
047940395
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a multi-usable pressure-sensitive transfer recording medium. More particularly, it relates to a multi-usable pressure-sensitive transfer recording medium for use in over-strike or multi-strike printing on impact type typewriters or printers.
BACKGROUND ART
Such kind of multi-usable pressure-sensitive transfer recording medium which has been known heretofore includes a recording medium having a structure wherein a foundation of a plastic film and a finely porous layer in which a liquid ink paste is contained are bonded to each other with an adhesive layer composed of a vinyl chloride-vinyl acetate copolymer, as disclosed in Japanese unexamined patent publication No. 58-29694.
The above-mentioned pressure-sensitive recording medium had a drawback that the finely porous layer itself was liable to peel off from the film foundation and be transferred, whereby subsequent printing was made impossible, in particular, when printing was repeated at low temperatures, even though such adverse phonomenon took place either at ordinary temperatures or at high temperatures.
It is an object of the present invention to provide a multi-usable pressure-sensitive recording medium, the same position of which is capable of being used repeatedly for printing under a low-temperature circumstance as well as under an ordinary or high-temperature circumstance.
DISCLOSURE OF THE INVENTION
The present invention provides a multi-usable pressure-sensitive transfer recording medium wherein a finely porous layer comprising minute porous particles and a binder material for bonding the porous particles to each other is provided on a surface of a foundation, and a liquid ink paste substantially incompatible with the binder material is contained in said finely porous layer, characterized in that said foundation is a plastic film, and said foundation and said finely porous layer are bonded to each other with an adhesive layer comprising a hydroxyl group-containing copolymer comprising vinyl chloride and vinyl acetate, said copolymer being cross-linked with an isocyanate compound.
The recording medium of the present invention does not cause the problem that the porous layer peels off from the film foundation, even when the same position of the recording medium is used repeatedly for printing 20 or more times under a low-temperature circumstance, for example, at 0.degree. C., as well as under an ordinary or high-temperature circumstance (for example, up to 45.degree. C.). Thus a good printing can be effected by using the recording medium of the present invention.
Such effect does not alter adversely even after the recording medium of the present invention is allowed to stand either at -20.degree. C. for a week or at 60.degree. C. for a week.
The present invention is characterized by an improvement on the adhesive layer used for bonding the finely porous layer and the foundation to each other with respect to the above-mentioned recording medium.
The adhesive layer used in the present invention is formed from an adhesive prepared by cross-linking a hydroxyl group-containing vinylchloride-vinyl acetate copolymer with an isocyanate compound. This adhesive has an excellent adhesive property, in particular, at low temperatures.
The above-mentioned hydroxyl group-containing vinyl chloride-vinyl acetate copolymer contains the following recurring units: ##STR1##
The copolymer is prepared by partially hydrolyzing a vinyl chloride-vinyl acetate copolymer.
A hydroxyl group-containing vinyl chloride-vinyl acetate copolymer containing 5 to 15% by weight of the vinyl alcohol unit, 85 to 93% by weight of the vinyl chloride unit and 0.5 to 3% by weight of the vinyl acetate unit is preferred. When the content of the vinyl alcohol unit is lower than 5% by weight, an adhesive strength between the finely porous layer and the foundation is lowered. When the content of the vinyl alcohol unit is higher than 15% by weight, the solubility of the copolymer to solvent is remarkably lowered and the pressure-transferabil
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Patent Abstracts of Japan, vol. 7, No. 116 (M-216) [1261], May 20, 1983, and JP,A,58-36481.
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Fuji Kagakushi Kogyo Co., Ltd.
Kittle John E.
Schwartz P. R.
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