Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
  • B41N1/00—Printing plates or foils; Materials therefor
  • B41N1/24—Stencils; Stencil materials; Carriers therefor
  • B41N1/241—Stencils; Stencil materials; Carriers therefor characterised by the adhesive means
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
  • Y10S430/165—Thermal imaging composition

Definitions

• a heat-sensitive stencil paper comprising a film made of a vinylidene chloride-vinyl chloride copolymer and adhesively lined with a support sheet consisting of a porous thin sheet of paper by the use of a polyvinyl acetate adhesive which is applied thereto in amount ranging from about 0.5 to about 5.0 grJm. in terms of the solid weight of adhesive, and being adapted to form a printing image consisting of perforations in said film when exposed to infrared light.
• the present invention is related to a heat-sensitive stencil paper of the type in which a resinous film made of vinylidene chloride-vinyl chloride copolymer is adhesively attached by an adhesive to a porous thin sheet of paper serving as the support sheet, wherein said adhesive consists principally of polyvinyl acetate and wherein said adhesive is applied in amount ranging from about 0.5 to about 5.0 grJm. in terms of the solid weight of the adhesive.
• the object of the present invention to provide a heat-sensitive stencil paper of the type in which a film made of a synthetic resin consisting of a vinylidene chloridevinyl chloride copolymer is adhesively attached to a known porous thin sheet of paper which serves as the support, by the use of an adhesive and that a clear printing image consisting of perforations is formed in said film by exposing said stencil paper to infrared light, wherein said adhesive consists of a polyvinyl acetate resin and wherein said adhesive is used in an appropriate amount.
• Conventional adhesives include those made of materials such as synthetic resins, rubbers, starches and rosin. However, those which are most often used, among the various resinous adhesives, are represented by those intermediate polymers from coldsetting resins (polymeric resins prepared by the use of catalyst) or from thermosetting resins. Adhesives made of other materials may be divided into numerous complicated groups if this division is performed minutely. Accordingly, there are innumerable kinds of adhesives and also they are used for a variety of purposes. For this reason, it is impossible to select proper adhesives which satisfy the specific purpose as is aimed at by the present invention from among the countless number of adhesives, unless painstaking inventive efforts are exercised.
• thermosetting resins include a large variety of resins such as phenolic resins, epoxy resins, alkyd resins and many other kinds of resins.
• resins of these groups When resins of these groups are employed in the manufacture of heat-sensitive stencil papers, there invariably occurs the phenomenon that the product stencil papers become hardened. This hardening of the product is caused by the hardening of the layer of adhesive which is located intermediate of the laminated sheet materials. For this reason, the product structure feels stiff or starchy and is poor in the ability to form perforations, and thus, the product is not suitable for being used as a commercial article.
• Some of the thermosetting resins possess the property, depending on the degree of polymerization thereof, of sofiening when heat is applied thereto. However, polymerization of these resins will proceed due to their exposure to continued I heating or as a result of their being left to stand for an extended period of time, and accordingly, these resins cannot be applied to the present invention either.
• Rubber adhesives include those made of natural rubber and synthetic rubbers (polychloroprene, niu'ile, butadiene-styrene rubbers). These rubber adhesives are provided in various forms such as solutions in which rubbers are dissolved in solvents, or they are provided in the form of emulsions. These rubber adhesives are good in adhesion but they are not necessarily satisfactory in the ability of forming perforations.
• Starch adhesives and proteinocesus adhesives not only are inferior in adhesion but also they have many problems in regard to their waterproofness and other aspects, and accordingly, they can not be applied to practical use either.
• thermosetting resins which are one of the many adhesives made of synthetic resins
• thermoplastic resins which have been developed rapidly of late.
• Adhesives made of thermoplastic resins also vary widely in type and property. An extensive research was conducted by us, on the adhesives made of thermoplastic resins, and as a result, it was discovered that an adhesive consisting principally of polyvinyl acetate was quite effective for the purposes of the present invention. Although the reason why polyvinyl acetate adhesive exhibits a good result has not been elucidated in detail, it is presumed that this good result is due to the low softening point and the narrow range of melting temperature of this resin.
• the adhesives made of polyvinyl acetate resins which are used in the present invention include not only those adhesives in the form of both emulsions and solutions of vinyl acetate homopolymers, but also those adhesives in the form of both emulsions and solutions of a copolymer of vinyl acetate and a monomer of other type, such as vinyl acetate-acrylic or acrylate copolymer, vinyl acetate-vinyl-pyrrolidone copolymer, vinyl acetate-vinyl chloride copolymer and vinyl acetateethylene copolymer.
• the preferred polymerizing proportion of vinylidene chloride to vinyl chloride, both of which constitute the vinylidene chloride-vinyl chloride copolymer employed in the present invention is in the range of 70-30/95-5.0.
• the materials of the porous thin sheets of paper which are employed in the present invention include natural fibers such as the fibers of paper mulberry, mitsumata and manila hemp, synthetic fibers such as those of rayon acrylic resin, nylon and polyvinyl alcohol, and mixtures thereof.
• a resinous film consisting of a vinylidene chloride-vinyl chloride copolymer and having a thickness of 10; was adhesively attached to a support consisting of a porous thin sheet of paper of p.in thickness and l3gr./m.' in weight by the use of a known laminating machine and in such a way that the deposited amount of said adhesive was 2.0 gr./m..
• EXAMPLE 2 An adhesive in the form of an aqueous emulsion of vinyl acetate (trade name: Bond CV 100, a product of Gisuke Konishi and Co., Ltd. of Japan) was diluted with water to a viscosity of about 70 cp. Using the resulting adhesive, a resinous film consisting of vinylidene chloride-vinyl chloride copolymer and having a thickness of 8pwas adhesively attached to a support sheet consisting of a porous thin sheet of paper of 30p.in thickness and l 1 gr./m. in weight by the use of a laminating machine and in such a way that the amount of the deposited adhesive was 4 gr./m. in terms of the solid weight of the adhesive. The result was as good as that noted with the product obtained in Example 1.
• EXAMPLE 3 An adhesive in the form of an aqueous emulsion of modified vinyl acetate (trade name: Cemedine No. 630, a product of Cemedine Co., Ltd. of Japan) was diluted with water to a viscosity of about 150 cp. The resulting adhesive was used in adhesively attaching a resinous film of a vinylidene chloridevinyl chloride copolymer of l2p.in thickness to a porous thin sheet of paper of 40p.in thickness and 15 grJm. in weight. The result was as good as those results obtained in the preced ing two examples.
• l paper comprising a synthetic resin film, the principal component of which is a vinylidene chloride-vinyl chloride copolymer, a porous thin fibrous sheet as a support for said film and an adhesive layer for securing together said film and said support, the improvement wherein said adhesive layer consists of a polyvinyl acetate resin selected from the group consisting of vinyl acetate homopolymer vinyl acetate-acrylic acid copolymers, vinyl acetate-acrylic acid ester copolymers, vinyl acetate-vinyl pyrrolidone copolymers, vinyl acetate-vinyl chloride copolymers and vinyl acetate-ethylene copolymers;
• a heat-sensitive stencil paper according to claim I wherein the mol ratio of vinylidene chloride/vinyl chloride in said film is in the range of 7040/ -5.0.

Landscapes

• Printing Plates And Materials Therefor (AREA)
• Laminated Bodies (AREA)

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Publications (1)

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Citations (2)

• 1968
  • 1968-09-16 US US762352A patent/US3610142A/en not_active Expired - Lifetime
  • 1968-10-02 GB GB46852/68A patent/GB1247552A/en not_active Expired
  • 1968-10-02 DK DK475768AA patent/DK122589B/da unknown
  • 1968-10-03 FR FR1594625D patent/FR1594625A/fr not_active Expired
  • 1968-10-03 DE DE19681800964 patent/DE1800964A1/de active Pending

Patent Citations (2)

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