JP2000347440A - Base paper as support of transfer paper for transferring picture formed by picture forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a base paper usable as raw paper for manufacturing transfer paper and hardly curling without any trouble even in handling and in making the paper pass through a picture forming device such as an electrophotographic copying means by making the base paper good in paper quality and dimensional stability and containing a water-resistance imparting agent, kaolin and a polymeric resin pass through a so-called super-treatment to make the paper surface smooth with a roller. SOLUTION: Such a raw material paper is selected as the base paper that has 70-200 mm basis weight dimensional stability and good paper quality. Inorganic fillers, which are treated with the water-resistance imparting agent by adding a polymer such as polyvinyl alcohol and SBR latex, are coated on the front and back surfaces of the paper. After that, a derivative of acrylic acid is coated as a releasing layer and the coated paper is subjected to the super treatment mentioned above to produce the base paper as an underlayer of a support of transfer paper for transferring a picture formed by the picture forming device. The obtained base paper containing kaolin and the polymeric resin is coated with a releasing resin on one side, which can be used as some kind of transfer paper as it is. It does not curl even when left as it is in an atmosphere of 20 deg.C and 65% relative humidity(RH) for a long time. A clear picture can be obtained even when it is made to pass through the picture forming device of the electrophotographic copying means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the production of a base paper for transfer of a pattern toner layer or the like formed by an image forming apparatus such as an electronic copying unit onto the surface of a transfer target base material. More specifically, the present invention relates to a method for producing transfer paper base paper using kaolin / polymer resin-containing paper as a resin-coated base paper for transfer.

[0002]

2. Description of the Related Art Conventionally, transfer paper has been manufactured by applying a resin to a silicone release paper having releasability, etc., and Japanese Patent Application No. 136401/1996 and 131306/1996 are known. .

[0003]

However, the transfer paper having a releasable polymer layer such as silicon on one side and having a transfer resin applied on the release layer is compared with the back side. However, since there is a large difference in the hygroscopicity, if left indoors (especially at high humidity in the summer), the transfer paper will curl, causing problems in smooth passage through the color copier and handling of the transfer paper. Was. In order to solve this problem, it has been proposed to form a water-insoluble polymer resin film on the back surface of the transfer paper to reduce the difference in moisture absorption between the front and back surfaces of the transfer paper and to prevent curling (1997). (Japanese Patent Application No. 090282). However, the above method requires not only the application of the resin layer used for the transfer but also the application of the back surface thereof, and the problem remains that the production of the transfer paper is complicated.

[0004]

The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have found that a method for transferring a pattern formed by an image forming apparatus including an electronic copying means onto the surface of a substrate to be transferred. As base paper for transfer paper used in
As a result of examining various types of base paper, 1. Use base paper that has good texture and excellent dimensional stability as a raw material. 2. An inorganic filler layer treated with a waterproofing agent containing a polymer or the like is provided on the surface layer and the back layer. 3. Acrylic acid derivative is applied to the surface layer as a release layer. 4. Spar hanging process.

In this process, it has been found that a base paper for a transfer paper for taking an image to be formed by a desired color copy or the like can be manufactured, and the present invention has been achieved. That is, a base paper having a dimensional stability of 70 to 20 mm / basis weight and a good texture is selected, and inorganic fillers treated with a water-resistant agent to which polymers such as polyvinyl alcohols and SBR latex are added are coated on both sides. Then, an acrylic acid derivative is applied as a release layer and sparging is performed. This is a method for producing a base paper as a lower layer of a transfer paper support of an image formed by an image forming apparatus.

Base paper having good texture and excellent dimensional stability includes, as raw material pulp, mechanical pulp, chemical pulp, deinked waste paper pulp, non-wood pulp, and unbleached semi-bleached chemical fiber. Used as a mixture. The following resin-impregnated papers impregnated with various resins are also recommended. In the papermaking process, a paper strength enhancer, a sizing agent, a filler, a retention aid, and if necessary, an antifoaming agent, a leveling agent, a dispersant, a water retention agent, a lubricant, and various additives are used. . It is also important to select the raw pulp and the various additives in the papermaking process.

As the resin, a poly (meth) acrylic acid derivative [hereinafter, polyacrylic acid derivative and poly (methacrylic acid)]
Abbreviations for both derivatives], poly (meth) acrylates (hereinafter abbreviated as either ester of acrylic acid or methacrylic acid), copolymers such as polyvinyl acetate, polyvinyl chloride, polyethylene, and polystyrene Resin emulsions and the like can be mentioned.

Polymers to be mixed with the inorganic filler of the water-proofing agent treatment as the inorganic filler layer include polyvinyl alcohol (hereinafter abbreviated as PVA), rubber latex, and the like.
Acrylic resin and fluorine resin are mentioned. PVA preferably has a high degree of saponification (98 mol% or more) and a degree of polymerization of 500 or more. The high saponification degree PVA has a low hygroscopic property and has a suitable conductivity for this purpose. SBR latex is suitable for rubber-based latex. These polymer resins are contained in the paper in an amount of 5 to 50% by weight, preferably 10 to
35% by weight is contained.

As a water-resistant treatment agent for the inorganic filler, a water-soluble zirconium compound such as ammonium zirconium carbonate, sodium zirconium phosphate, zirconium acetate,
Zirconium chloride and the like can be mentioned, and an AZ coat 5800 (an active ingredient of 45%) of Sannopco, which is made of ammonium zirconium carbonate, due to its price, effect, and ease of handling.

The kaolin used here is hydrated aluminum silicate such as Al 2 O 3 .2SiO 2 .2H 2
Indicated by O, any of residual kaolin (primary kaolin) and deposited kaolin (secondary kaolin) may be used. 15-50% of all inorganic and organic pigments are used. In particular, kaolin, referred to in the art as "Ultra White" as a trade name, meets the objectives of the present invention.

In the present invention, an inorganic filler treated with a water-resistant agent containing a polymer is provided in layers on the surface layer and the back layer. In some cases, the inorganic filler is not divided into the surface layer and the back layer, and is not formed into a layer. May be uniformly dispersed throughout. The filler mixture preferably has a coating amount of 3 to 30 g / m2, preferably 5 to 20 g / m2.

In the kaolin treated with the polymer-containing water-proofing agent used in the present invention, besides kaolin, clay, clay, silicas, heavy calcium carbonate, light calcium carbonate, aluminum hydroxide, silicon dioxide, titanium dioxide, It may contain inorganic pigments such as satin white, calcium sulfite and magnesium salts, organic pigments known as plastic pigments, and binder pigments, and may contain 5 to 80% by weight, preferably 10 to 50% by weight of the cellulose pulp. It may be mixed in the range. Polymer resin mixed with kaolin, and pigments used in combination with kaolin, are not particularly limited, in addition to the inorganic pigments and organic pigments, starch, oxidized starch, esterified starch, etherified starch, Modified starch such as cationized starch and cellulose derivatives can be used in combination.

As a final step of the coating step of the production method of the present invention,
This is a coating of a resin having a releasability such as a poly (meth) acrylic acid derivative, a silicone resin, and a fluororesin having a thickness of 1 to 10 μm on the uppermost layer on the surface. Cover coat resin LO73
There is HW (adaptive chemistry). After the application of these releasable resins, the base paper obtained by sparging is given flexibility. Among these polymer resins, a particularly preferred resin is a poly (meth) acrylic acid derivative, and an organic solvent solution can also be used as the poly (meth) acrylic acid derivative. Also,
An emulsion in which an acrylic resin is uniformly dispersed in an aqueous medium may be used. This can be obtained by emulsion polymerization of an acrylic monomer in an aqueous solution of a dispersion stabilizer.
Examples of the dispersion stabilizer include a nonionic surfactant such as polyoxyethylene nonylphenyl ether, an anionic surfactant such as a sulfate ester salt of the nonionic surfactant, an acid value of 20 to 150, and a number average molecular weight of 5,000 to 3,000.
For example, 0000 water-soluble acrylic or methacrylic resin is used.

The acrylic and methacrylic monomers used herein include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate Esterified product of acrylic or methacrylic acid such as C1 to C20 monohydric alcohol; ethylene glycol di (meth) acrylate, 1,6-hexanedi (meth) acrylate, trimethylolpropane di (meth) acrylate, allyl (meth) ) Acrylic or methacrylic acid such as trimethylolpropane tri (meth) acrylate and a dihydric or higher alcohol having 2 to 16 carbon atoms to form two or more polymerizable double bonds in one molecule. A compound having;
Hydroxy group-containing alkyl (meth) acrylates such as hydroxypropyl (meth) acrylate (C2 -C16)
One or two or more selected from the above can be used.

The polyacrylic acid derivatives used in the present invention include the above-mentioned acryl, methacrylic acid derivatives, polymers thereof, and derivatives thereof such as acrylamide, methacrylamide, acrylonitrile, polymers and copolymers thereof. No. In addition, these derivatives and α,
Copolymers with a monomer having an ethylenically unsaturated bond such as β-unsaturated carboxylic acid are also included. styrene·
Acrylic acid copolymers can also be used.In particular, styrene-acrylic acid copolymers are converted to alkali salts and then acrylamide, methacrylamide, acrylonitrile, and the above acrylic or methacrylic esters are graft-polymerized. Among these polyacrylic acid derivatives, And polymers of acryl, methacrylic esters, acrylamide, and methacrylamide are preferred. Further, a plasticizer such as a phthalic acid ester may be contained.

The kaolin / polymer resin-containing paper thus obtained can be used as it is as a kind of transfer paper when one side is coated with the above-mentioned release resin. Further, if necessary, depending on the transfer target of each image, the upper layer may be coated with various synthetic resin layers as a transfer layer to obtain transfer paper for each target. The transfer paper in any of the above cases is 20
It does not curl even when left for a long time in an environment of 65% RH at 65 ° C.
In addition, a clear image was obtained even when the image was passed through an image forming apparatus of an electronic copying unit such as a color copy, and the obtained image could be transferred to a target transfer target surface without any problem. . Hereinafter, the present invention will be described with reference to Examples, but the present invention is not limited thereto. Parts represent parts by weight and% represents% by weight.

Example 1 (Production of transfer paper base paper 1) Bleached kraft pulp was beaten as usual, and 15% of rutile-type titanium oxide (relative to pulp) and 1.0% of a cationic polyamide resin as a wet strength enhancer ( Pulp) mixed,
Further, 2.0% of a sulfuric acid band (relative to pulp) was added, and the mixture was neutralized with sodium aluminate to adjust the pH to 7.0, followed by paper making with a fourdrinier paper machine. The basis weight of this base paper is 90 g / m 2, air permeability 5
Seconds. The dimensional stability was 35 mm per basis weight. This is referred to as transfer paper base paper 1.

Example 2 (Type having an inorganic filler layer on the front and back) Ultra White 90 (Mckin tire factory of Emc), AZ Coat 5800 (San Nopco)
Treated with 10% SBR latex (Nippon Synthetic Rubber), non-ionic antistatic agent Chemistat 2500
(Sanyo Chemical), PVA117 and PVA105 (Kuraray)
Of a 1: 1 mixture of 12 g / m 2 on each side
Each was coated. Acrylic resin solution cover coat resin LO73HW (Kyogaku Kagaku) as a release layer on the surface 3-4μ
It was coated so that it becomes. A transfer paper base paper 1 having front and back inorganic filler layers was obtained. 110g / m2 basis weight, 10.3m thickness
m, elongation (length) 2.2%, and elongation (width) 4.0%.

Example 3 [Preparation of acrylate / acrylamide emulsion (one component of coating liquid)] According to a conventional method, in an aqueous dispersion stabilizer in the presence of a catalyst, 2
After obtaining an acrylic polymer from 40 parts of -hydroxyethyl- (meth) acrylate and 60 parts of acrylic acid, ammonia was added to form an ammonium salt, and acrylamide 10
Graft polymerization was performed by adding 0 parts to obtain a water-soluble polymer.
Water was added to form a coating solution having a solid concentration of 25%.

Example 3 (Production and application of coating liquid, transfer paper base paper 2 containing kaolin / resin uniformly) The coating liquid of Example 2 and SBR latex (for paper coating) were used in a resin content of 1: 1. The mixture was mixed at a ratio to obtain a dispersion having a resin content of 25%. To this dispersion was added 5% fine particle kaolin and 5% of papermaking clay to obtain a coating liquid. Each side was coated and dried with a roll coater, and a silicone release agent was applied to one side to obtain a kaolin / resin-containing transfer paper base paper 2 (uniform content). Basis weight 113g / m2, thickness 11.3m
m, elongation (length) was 2.3%, and elongation (width) was 4.3%.

Example 4 (Production of transfer paper 3 from transfer paper base papers 1 and 2 containing kaolin / resin) Transfer layer coating liquid formulation (parts by weight) HYDRAN AP-20 * 180 parts HYDRAN AP-70 * 220 parts Silica fine Powder 3 parts Silicone defoamer 1 part VONCOAT V * 3 0.5 part 25% ammonia 0.5 part Viscoelastic modifier 0.5 part UV absorber 0.5 part Silane coupling agent 0.5 part Antioxidant 0.5 parts Conductive agent 0.5 parts Triethanolamine 2 parts Leveling agent 0.5 parts Hindered amine-based light stabilizer 0.5 parts Note * 1: Carboxyl group-containing urethane emulsion manufactured by Dainippon Ink and Chemicals (resin content 30%) * 2: Carboxyl group-containing urethane emulsion manufactured by Dainippon Ink and Chemicals (resin content 35%) * 3: Acrylic emulsion (made by Dainippon Ink and Chemicals) 29%) A uniform mixture of the above-described transfer layer coating liquid formulation in each of the transfer paper base paper 1 of Example 2 (type having an inorganic filler layer on the front and back) and the transfer paper base paper 2 of Example 3 (uniform content). Was applied to produce transfer paper 3-1 from base paper 1 and transfer paper 3-2 from base paper 2 of the present invention.

Example 5 (Measurement of Curl) Transfer paper 3-1 and transfer paper 3-2 produced from the kaolin / resin-containing transfer paper base paper of the present invention and kaolin / resin-free base paper having a basis weight of 90 g / m 2 were used. Apply silicone release agent,
Transfer paper 4 coated with transfer layer coating solution of the above formula (Comparative Example)
Were compared. Further, acrylic urethane is coated on the back surface of the transfer paper 4 [Hitaloid 3012X (acryl polyol 50
% Organic solvent solution, Hitachi Chemical) 100 parts, duranate 2
4A-100 (a biuret-type trimer of hexamethylene diisocyanate, Asahi Kasei) coated with a uniform mixture of 20 parts]. Measurement conditions and method: A4 size transfer paper at 30 ° C
After leaving it for 5 minutes under the condition of 85% RH, it is transferred onto a plastic sheet having no hygroscopic property, the transfer layer of the transfer paper is placed on top, and the winding height of the end of the paper is measured. Measurement result: The transfer paper 4 could not be measured because the upper surface was rolled up in a cylindrical shape. On the other hand, transfer paper 3-1 and transfer paper 3-2 (all manufactured from the base paper of the present invention), transfer paper base paper 1 and transfer paper base paper 2 (containing kaolin), and transfer paper 5 (transfer paper 4
Was coated with acrylic urethane on the back surface of the sample, and no curl was observed.

[0023]

EFFECT OF THE INVENTION The transfer paper manufactured from the kaolin / resin-containing transfer paper base paper of the present invention, and kaolin /
Transfer paper having a resin layer and transfer paper containing kaolin and resin homogeneously have the same high humidity as transfer paper coated with acrylic urethane, regardless of whether the back surface is coated at all. Under the conditions, without curling, handling
In addition, it was confirmed that there was no problem when passing an image forming apparatus such as an electronic copying unit such as a color copy.

[0024]

[Brief description of the drawings]

FIG. 1 Transfer paper base paper 1 A: Acrylic resin functioning as release layer B: Coating layer of kaolin, water-resistant agent, PVA, etc. C: Base paper basis weight 80 g / m 2

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) D21H 19/40 D21H 19/40 27/00 27/00 Z F term (reference) 4L055 AG27 AG64 AG69 AG71 AG76 AG86 AG97 AH50 AJ04 BE02 BE09 EA08 EA14 FA09 FA18 GA10

Claims (6)

[Claims] 1. A base paper having a good texture and dimensional stability as a lower layer base paper of an image support formed by an image forming apparatus including an electronic copying means. A method for producing a base paper for a lower layer of an image support by an image forming apparatus, which comprises passing through a hanging step. 2. The method according to claim 1, wherein the dimensional stability is 1
A method for producing a base paper using a base paper having a basis weight of 70 to 20 mm. 3. The method according to claim 1, wherein an inorganic filler mixture containing an inorganic filler such as kaolin or clay treated with a waterproofing agent, a polymer such as polyvinyl alcohol or SBR latex, or an antistatic agent is added to the surface layer. A process for producing base paper, characterized in that both back layers have a layered form or that the mixture is homogeneously contained. 4. The method for producing base paper according to claim 1, wherein said filler mixture has a coating amount of 5 to 20 g / m 2. 5. The base paper according to claim 1, further comprising a release layer of a polyacrylic acid or poly (methacrylic acid) derivative, a silicone resin, a fluororesin, or the like having a thickness of 1 to 10 μm on an uppermost layer on the surface. Manufacturing method. 6. The method according to claim 1, wherein the base paper having good texture and dimensional stability is coated on both surfaces of the surface layer and the back layer with an inorganic filler containing a water-resistant agent containing a polymer or the like,
A method for producing a base paper, comprising applying a polyacrylic acid or poly (methacrylic acid) derivative, a silicone resin, a fluororesin, or the like as a release layer to a surface layer and performing a super-hanging treatment.