JPS59135190A - Original for lithographic printing - Google Patents

Abstract

PURPOSE:To provide an original for a direct drawing type lithographic printing in variably free from ground staining and with a better printability without strict management of drying conditions by laminating an image receiving layer containing an inorganic pigment, CMC and a polyglycidyl ether compound on a water resistant support. CONSTITUTION:An image receiving layer containing (A) an inorganic pigment (e.g. kaolin clay and aluminum oxide), (B) CMC and (C) a polyglycidyl ether compound (e.g. compounds of the formulas I and II) preferably at the rate of 0.1-0.5pt.wt. of the components B+C with respect to 1pt.wt. of the component is attached to a water resistant support preferably at the rate of 5-15g/m<2> for one side thereof to obtain an intended original.

Description

DETAILED DESCRIPTION OF THE INVENTION The present defense relates to a lithographic printing original plate, particularly a direct lithographic printing JtJ.
It concerns the original edition.

The original plate for direct drawing type lithographic printing is one in which a 1lIll image-receiving layer is provided on a water-distributing support.
An image is formed using an oil-based ribbon or the like, or an image is formed on the layer by transferring toner If (oil-based) using a plain paper copying machine, and this is used as an original plate to print on a plain clothes printing machine to print a multi-pole sheet. It is used to print printed matter.

Such a lithographic printing original plate is required to not cause background staining during HJ printing and to have good printing durability, that is, to be able to obtain polygonal printed matter from one original plate.

The purpose of the xylophone 11 is to provide a lithographic printing original plate which is free from scumming and has good printing durability.

The lithographic original plate of the present invention has an image receiving layer laminated on a water-resistant support, and the layer contains an inorganic pigment, carboxymethyl cellulose, and a polyglycidyl ether compound.

By making the +iK layer have the above-mentioned composition, the present invention provides a lithographic printing original plate that is always free from scumming and has good printing durability, even if the coating and drying conditions at the time of layer formation are not strictly controlled. It is something that can be done.

Moisture-resistant treated paper, plastic film, synthetic paper, etc. are used as the water-resistant support, and waxy inorganic pigments include kaolin clay, aluminum oxide, silicon oxide, zinc oxide, calcium carbonate, titanium oxide, etc. .

Carboxymethyl cellulose can be purchased as a commercial product.

The polyglycidyl ether compound is a compound produced by reacting epichlorohydrin with glycolk, white, and polyol p, and examples thereof include compounds II.1 shown below.

(1) n = l~11 ″)　　　　　　　-・H3 n=l~6 (3) OH-OH CH2-0(3H2-C!HJ3H2 \1 0H2-0-CH2-Kaku C, MeH2 (5) C! H2-OH-OH2-0-OH2-OH*H All of these are commercially available and can be easily obtained.

In the image-receiving layer of the present invention, the total usage ratio of carboxymethyl cellulose and polyglycidyl ether compound to 1 part by weight of the inorganic pigment is preferably 0.1 to 0.5 parts by weight, and if it is less than 0.1 part by weight, the ratio is less than 0.1 part by weight. If the intensity is greater than 0,5'j [hT part, image receptivity will deteriorate.

In particular, the retention of the toner mound when forming 1 1 swath with +■8 machines,? j %'f property becomes inferior.

The usage ratio of the polyglycidyl ether compound to the carboxymethyl cellulose is 0.2 to 5 for loquat, and 1111 for less than 0.2 medium tηIS.
1% + 1 water control of the receiving layer 1-1. decreases, and lithography 1-IJ
The printing durability when printing is poor, and if the amount is more than 5 times ZvI, the hydrophilicity decreases, and when lithographic printing is carried out, 1-41 printing may become smudged.

In order to obtain a lithographic printing original plate, an inorganic material, carboxymethyl cellulose, and a polyglycidyl ether compound 'i') I are coated on one or both sides of a water-resistant support.
In other words, it is sufficient to apply a paint consisting of 14 components to C; 1 + cloth, dry it, and then apply a layer of 1' to form a receptive layer.

The Vf Hayabusa of the image IW receiving layer is 5 to 15 V/m'' per side.
is so clever.

Example I Freeness level 3 consisting of LBKP7 heavy weight part vs. NBKPa heavy weight part
Add 1.5 grams of water bathing phenol to the pulp slurry of 5°SR, and add 0.5% gin.
and 1% of sulfuric acid band (all solid content ratios) were added thereto and sent to a fourdrinier paper machine to prepare a water-resistant support made of wet paper having a weight of 50 f/m'.

Next, a material having the following composition was dropped onto the screen of the above-mentioned water-resistant support, and heated to 0.5, 1, 2 and 4 minutes with hot air at 130°C.
Under the condition of 1 = t1, *L is searched and 1; 1 sentient beings are all 102/pictures per side. By adding one layer of image-receiving layers to +r", a 4-piece lithographic printing master plate is made into a samurai.

50% aqueous dispersion of kaolin clay I WN 50% aqueous dispersion of partial silicon oxide 0.5 parts by weight Calcium carbonate 50% water molecule IT solution 0.5 Jijyobu Ichikyo versions of these four gods are all The quality of the image (1 image of toner acid transfer image) on Gunko photo plain paper first copy (FT4060, manufactured by Ricoh) is good, and the non-image area is insensitized by Insensitivity 1 (Fax etch liquid, manufactured by Ricoh). After the fattening treatment, the plates were run on a lithographic printing machine (Auto Printer AP1600 manufactured by Ricoh Co., Ltd.), and more than 1,000 prints were obtained from each original plate while maintaining good image quality.

On the other hand, as a comparative example, instead of the carboxymethyl cellulose and polyglycidyl ether compound of this example, 0.075 parts by weight of an 80% water bath solution of melamine resin (Sumirese 612 manufactured by Sumitomo Chemical IN) and 10% water M? of polyvinyl alcohol were used. 1.4 parts by weight of T, and 0.4 parts by weight of ammonium chloride.
0075-4f A four-glaze original was made in the same manner as in this example except that the + part was used.

Performance test 11 similar to this example. (2) was performed on these original plates, and the printing durability was 10 for those with a drying time of 130°C for 0.5 and 1 minute at the time of forming the receiving layer.
Those with a print life of 0 or less and 2 minutes showed a printing durability of about 500 to 600 sheets, and those with a print life of 4 minutes showed scumming on the printed matter as a problem before the printing durability.

Example 2 The following composition was applied to both sides of one body with the same support as Al l, and the adhesion strength was 9 after being placed on the bed with hot air at 130°C for 1 minute.
An original plate was obtained in the same manner as in Example 1 except that the f4 layer was used.

50% water dispersion of kaolin clay 1.4 parts by weight 50% aqueous dispersion of calcium carbonate 0.6 parts by weight, formula H is (20 polyglycidyl ether compound
An original plate was obtained in the same manner as in Example 2, except that the image-receiving layer was laminated using the material of Example 3.

50% aqueous dispersion of kaolin clay 1.5 parts by weight 50% aqueous dispersion of zinc chloride 0.5 parts by weight As a result of wiping 7, all of them showed good image receptivity and good 111i 1 image negative σ) printing with no background smearing: Momme 10
More than 00 pieces were obtained.

1. Last applicant: Ricoh Co., Ltd.

Claims (1)

[Claims] A lithographic printing original plate comprising an image-receiving layer laminated on a water-resistant support, wherein the image-receiving layer contains an inorganic pigment, carboxymethyl cellulose, and a polyglycidyl ether additive. .