Nippon Paper Industries Co., Ltd.

Sanyo-kokusaku Pulp Co., Ltd.

Hisahiro Omote

Masahide Takano

Akio Hoshino

Mitsuhide Hoshino

Masahiro Yoshikawa

Masahito Suzuki

Tomonobu Ohmura

Tomoyuki Nakano

Jiro Yoshimura

Satoshi Kuwabara

The present invention is an electrophotographic transfer paper where at least one side of the base paper is given a coating layer with a pigment and an adhesive agent to form coated paper and where the aforementioned adhesive contains a branched poly(meth)acrylamide copolymer having a cationic groups and/or anionic groups and also has a weight average molecular weight of 50,000 to 1,000,000. The electrophotographic transfer paper in the present invention has superior high-speed throughput performance despite low basis weight and a low coating weight, therefore, good for high-speed copy machine and printer properties, especially, when it contained a printability improver in the coating layer, it has a good ink adhesion property and surface strength required in offset printing.

Electrophotographic transfer paper

An ink jet recording material produced by preparing a material (i) for transfer use, which has on a support having a high surface smoothness an ink receiving layer comprising a porous inorganic composition and a resin component; preparing another material (ii) to undergo transfer, which has at least one ink receiving layer coated on at least one side of a substrate; bonding the ink receiving layer of the material (i) to the ink receiving layer of the material (ii) in tight contact to form a united ink receiving layer; and then peeling the support of the material (i) off the united ink receiving layer to reproduce the surface shape of the support at the surface of the united ink receiving layer; wherein the united ink receiving layer has a total thickness of at least 20 &mgr;m and a gloss of at least 60% when measured at the incident angle of 60&deg; according to JIS Z8741: and a method of producing the aforesaid ink jet recording material.

Ink jet recording material and method of producing the same

Disclosed is a heat transfer recording method that utilizes an indirect transfer medium with deformable layer deforming under heat and/or pressure and image-receiving layer having adhesiveness to the image formed by fusion type heat transfer recording of hot peeling mode and allowing to retransfer the formed image alone onto image receiver provided on a supporter in this order. In this indirect transfer medium, the constituting material of that deformable layer comprises a substance with softening temperature of not higher than 90.degree. C. and stretch at breaking point of not less than 400%, and further the constituting material of the image-receiving layer contains a substance, in which the major component is acrylic resin comprising methyl methacrylate or/and hydroxyethyl methacrylate and this is graft copolymerized with hydroxyethyl methacrylate or/and N-methylol acrylamide. The inventive recording method needs no exclusive image receiver and affords a high-quality record without transfer miss on various recording image receivers with different surface smoothnesses by transferring the recording image alone.

Heat transfer recording method and indirect transfer medium to be used

A method of forming a multicolored image wherein image layers etc. formed on photosensitive transfer sheets are transferred in turn onto an image-receiving sheet and then, its image layer etc. are retransferred onto a permanent supporter. Both of a transferring image layer alone and a transferring image layer and adhesive layer are used properly for photosensitive transfer sheets. The finish quality comes close to original print and the runnability becomes better when making a color proof.

Method of forming multicolor image

(Objective) In a color-proof material performed by forming multi-color image on an arbitrary material (ultimate image-receiving material) such as paper using a photosensitive transfer sheet and an intermediate image-receiving sheet, the objective is to bring the quality close to the printed quality formed with inks alone. (Constitution) For the photosensitive sheet, the colored photosensitive layer is formed with a material comprising a synthetic resin emulsion with Tg=-20.degree. to 40.degree. C. such as acrylic ester or ethylene-vinyl acetate copolymer so that the image layer itself has heat-adhesivity. Moreover, the image-receiving layer of the intermediate image-receiving sheet is formed with a material containing a resin cross-linked copolymer of olefin and .alpha., .beta.-unsaturated carboxylic acid with metallic ions and a resin comprising a copolymer of ethylene and vinyl acetate in a proportion by weight of 100/0 to 10/90. (Effect) It becomes possible to transfer the image layer alone onto the ultimate image-receiving material, thus a color-proof close to the print formed with inks alone can be produced.

Method of forming multi-color image

An image transfer method is disclosed, characterized in for the preparation of a color proof wherein separate-in-color images are formed in each colored photosensitive layer of photosensitive material coated on a thermosensitive adhesive layer on a release surface provided on a support from which the thermosensitive adhesive layer is releasable, and a multicolor image is formed on an image receiver by transferring said separate-in-color images onto said image receiver one by one together with said adhesive layer, repeating concurrent heating and pressurizing procedures, and thereafter further submitting the image receiver with the multicolor image formed thereon to heat treatment.

Growing community of inventors

Higashimatsuyama, Japan

Hisahiro Omote