JPH03167397A - Transfer paper for electrophotography - Google Patents

Abstract

PURPOSE:To obtain the subject transfer paper without generating dirt of paper machine nor trouble of double feeding of transfer paper in copying operation containing pulp fiber, specific sizing agent and calcium carbonate-based filler as principal ingredients. CONSTITUTION:The aimed transfer paper contains (A) pulp fiber, (B) sizing agent of water-soluble or water-dispersible copolymer containing (i) styrenes and (ii) at least a species selected from aminoalkyl ester expressed by formula I (R<1> is H or methyl; R<2> and R<3> are 1-4C alkyl; A is 1-3C alkylene), acid-added salt of said ester and quaternary salt of the same ester and/or aminoacrylamide expressed by formula II (B is 1-3C alkylene), acid-added salt of the amide and quaternary salt of the same amide as constituting monomer and (C) calcium carbonate-based filler.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electrophotographic transfer paper used in electrophotographic copying machines, printers, and the like.

(Prior art) Conventionally, as a transfer paper for electrophotography, Japanese Patent Application Laid-Open No. 54-111
As disclosed in Japanese Patent Publication No. 740 and Japanese Patent Application Laid-Open No. 54-22831, acidic papers containing talc, kaolin, clay, etc. as fillers are the mainstream. However, in recent years in the paper industry, there has been a trend toward so-called neutralization, which involves using calcium carbonate as a filler and a neutral size sizing agent in the production of high-quality paper for printing and writing. It's increasing. The advantage of neutralizing high-quality paper is that it can reduce paper manufacturing costs by using inexpensive calcium carbonate as a filler, and it can also save energy and resources in paper manufacturing, improve productivity, and save equipment. It is possible to achieve various purposes such as extending life and purifying wastewater. An example of applying such neutral papermaking technology to electrophotographic transfer paper is
9-162560, JP 61-63854, JP 61-67038, JP 62-69
No. 94, etc., discloses alkenyl succinic anhydride and alkyl ketene dimer as the sizing agent used in these cases. (Problems to be Solved by the Invention) However, when alkenyl succinic anhydride or alkyl ketene dimer is used as a sizing agent,
During the production of electrophotographic transfer paper, stains occur particularly in a part of the paper making system, such as a part of the wire, a press part, a part of the dryer, etc., and as a result, there are quality problems such as spots on the paper.

In order to solve such quality problems, it is possible to wash away the dirt that has arisen, but this has the disadvantage of significantly reducing operability. In addition, problems specific to alkyl ketene dimers include:
Since the coefficient of friction of the formed paper is low, there are also problems when using the formed paper, such as transfer paper being fed in an overlapping manner during electrophotographic printing.

(A Thousand Steps to Solving the Problems) In order to solve the problems of the prior art described above, the present inventors have conducted extensive research and found that a specific styrene copolymer or The present inventors have discovered that by using the quaternized product, it is possible to obtain paper that does not stain the papermaking system at all and has an optimal coefficient of friction for electrophotographic transfer paper, and has completed the present invention. That is, the present invention provides an electrophotographic transfer paper comprising pulp fiber, a sizing agent, and a calcium carbonate filler as main components, in which the sizing agent is 1) styrene, and 2) general formula 11) (wherein R1 is a hydrogen atom). or methyl group, R” and R
3 are the same or different and are each an alkyl group having 1 to 4 carbon atoms, and A is an alkylene group having 1 to 3 carbon atoms), acid addition salts thereof, and quaternary salts thereof; and/or 〇 General formula (2) (wherein R'.R'' and R1 are each the above-mentioned Ichiryu formula i
At least one selected from aminoacrylamide, an acid addition salt thereof, and a quaternary salt thereof, which are the same as those of l+, and B represents an alkylene group having 1 to 3 carbon atoms, are used as a lateral monomer. This invention relates to an electrophotographic transfer paper characterized by being a water-soluble or water-dispersible copolymer. The filler calcium carbonate used in the present invention is not particularly limited, and various known ones such as heavy calcium carbonate and precipitated calcium carbonate can be used. As mentioned above, the constituent monomers of the sizing agent used in the present invention include styrenes (hereinafter referred to as heptanomer Ⅰ), dialkylaminoalkyl (meth)acrylate (hereinafter referred to as monomer Ⅰ) and/or dialkylaminoalkyl (meth) ) Acrylamide (hereinafter referred to as monomer ■)
It is.

Monomers ■ include styrene, a-methylstyrene,
Examples include vinyltoluene. The monomer ■ is N
．． N-dimethylaminomethyl (meth)acrylate, N
, N-dimethylaminoethyl (meth)acrylate, N
, N-dimethylaminobrovir (meth)acrylate,
・N. N-diethylaminomethyl (meth)acrylate, N,N-diethylaminoethyl (meth)acrylate, N. Examples include N-diethylaminobrobyl (meth)acrylate, as well as acid addition salts and quaternary salts thereof. Examples of acid addition salts include water-soluble acid addition salts containing inorganic acids such as hydrochloric acid and sulfuric acid, or organic acids such as formic acid, acetic acid, and propionic acid. Furthermore, quaternary salts refer to various salts obtained by quaternizing with known quaternizing agents such as alkyl halides, benzyl halides, and shrimp halohydrin. The monomers (2) include N,N-dimethylaminomethyl (meth)acrylamide, N,N-dimethylaminoethyl (meth)acrylamide, and N,N-dimethylaminopropyl (meth)acrylamide. N, N-
Diethylaminomethyl (meth)acrylamide, N,N
-diethylaminoethyl (meth)acrylamide. N
．． Examples include N-diethylaminopropyl (meth)acrylamide, as well as acid addition salts and quaternary salts thereof.
Note that the acids and quaternizing agents used to form acid addition salts and quaternary salts are the same as those described above. Further, to form an acid addition salt or a quaternary salt of the copolymer, it can be done in advance at the monomer stage, or it may be modified after the copolymer is obtained.

The proportion of the various constituent monomers used is about 40 to 95 moles, preferably 60 to 90 moles, of monomer (1) in the resulting copolymer. If it is less than 40 moles, the sizing effect will be insufficient, and if it exceeds 95 moles, the fixing of the sizing agent to the bulb will be insufficient, both of which are not preferred. Monomer ■ and monomer ■ are both 5
~60 mol X or so, preferably lO~40 mol 1. If the amount is less than 5 moles, the fixation of the sizing agent to the pulp will be insufficient, and if it exceeds 60 moles, the sizing effect will be insufficient, both of which are not preferred. In addition, when both monomer (■) and monomer (◎) are used together, the total amount thereof is about 5 to 60 mol 1, preferably 10 to 40 mol i, based on the resulting copolymer. In addition, in the copolymer, other heptanomers may be used in place of some of the above monomers, as long as they do not deviate from the purpose of the present invention and still maintain their effects. Examples of the other heptanomer include vinyl acetate, lower alcohol ester of acrylic acid, lower alcohol ester of methacrylic acid, acrylonitrile, etc., and the amount of the monomer used is about 20 mol 1 or less in the copolymer. be done.

The method for producing the copolymer is not particularly limited,
Various known methods can be employed. For example, using a water-soluble radical polymerization initiator such as hydrogen peroxide or potassium persulfate, the monomer mixture is prepared in an aqueous medium at a monomer concentration of 5 to 50%.
The reaction may be carried out at a weight of 1 and a temperature of 50 to 95°C for about 1 to 10 hours. When producing the electrophotographic transfer paper of the present invention using the sizing agent obtained above, the following raw materials are used to impart suitability for electrophotographic copying machines such as copyability, phototaxis, and curling properties. The composition, adjustment, and manufacturing conditions are controlled (Japanese Patent Publication No. 44-3673, Japanese Patent Publication No. 24199-1972, Japanese Patent Publication No. 55-47)
Publication No. 385). Specifically, the size of the sizing agent is usually 0.01-
1.0 weight, and the filler is usually 2 to 1 weight per pulp.
It is added internally so that the weight is about 1:20, and the paper is made into paper.
In addition, in order to maintain appropriate copy image density and prevent background (white background) stains, conductive agents such as sodium chloride, potassium chloride, styrene-maleic acid copolymer, and quaternary ammonium salts are added to the paper machine. The surface electrical resistance of the transfer paper (JISC
-2111) from 10” to l010Ω (relative 18
651°C, temperature 20°C). In addition, if swelling or curling occurs due to partial absorption of the transfer paper, the closeness between the photoreceptor of the copy paper and the transfer paper decreases during transfer, resulting in a decrease in copy image density and partial omission of copies. To prevent this, the moisture content of the paper is set to 4.5 to 5.51, and the paper is wrapped in moisture-proof wrapping paper to prevent moisture absorption and desorption during storage.

(Practical Examples) Hereinafter, the present invention will be specifically described with reference to reference examples, working examples, and comparative examples, but the present invention is not limited to these examples. In each example, all parts and percentages are based on weight unless otherwise specified. Reference Example 1 1000 parts of isopropyl alcohol was charged into a reaction apparatus equipped with a stirrer, a thermometer, a cooling tube, and a dropping funnel.
After heating to reflux temperature, a mixed solution consisting of 780 parts of styrene, 240 parts of N,N-dimethylamine ethyl methacrylate, and 20 parts of azoisobutyronitrile was dropped into the reaction system over 2 hours from a dropping funnel. The reaction was further maintained at the same temperature for 5 hours to complete the reaction. Then, about 750 parts of isobrobyl alcohol was distilled off from the resulting reaction solution, and 92 parts of acetic acid and 4,200 parts of water were added and dissolved to obtain Sizing Agent A. Reference Example 2 In addition to the sizing agent obtained in Reference Example 1, shrimp chlorohydrin 1
Sizing agent B was obtained by adding 42 parts and carrying out a reaction at 80 to 85°C for 3 hours. Reference Example 3 In Reference Example 1, N. The reaction was carried out in the same manner except that N,N-dimethylaminobrobylacrylamide was used instead of N-dimethylaminoethyl methacrylate,
Sizing agent C was obtained.

Reference Example 4 The reaction was carried out in the same manner as in Reference Example 2, except that N,N-dimethylaminopropylacrylamide was used instead of N,N-dimethylaminoethyl methacrylate.
Sizing agent D was obtained. Reference Example 5 The reaction was carried out in the same manner as in Reference Example 1 except that a monomer obtained by quaternizing N,N-dimethylaminobrobylacrylamide with methyl chloride was used instead of N,N-dimethylaminoethyl methacrylate. Agent E was obtained. Examples 1 to 5 and Comparative Examples 1 to 2 L-BKP (Freeness 400a+l csf)
and N-BKP (freeness 50 (lml csf
) using a valve with a blending ratio of 80 + 20, paper was made using a fourdrinier paper machine (500 m/min) according to the chemical formulation shown in Table 1, and then oxidized starch Ig/
rd and sodium chloride at 0.1 g/tn". The dirt on the press roll during paper making of this paper was measured as the amount of doctor adhesion. The physical properties of electrophotographic transfer paper include smoothness ( J.TAPPI No.
5) and static friction coefficient (J. TAPPI
No. 30 horizontal method) was measured. In addition, the maximum value of the difference in the coefficient of static friction between the upper and lower two sheets, which is related to double feeding (feeding several sheets overlapping each other), was calculated (the smaller the difference and the more constant the friction coefficient, the harder it is to cause double feeding). Ta. Furthermore, the number of double feeds was measured using an electrophotographic copying machine (Canon NP-48).
35, manufactured by Canon ■). Expressed as the number of double feeds that occurred when 1000 copies were made. Margin below E] (Effects of the invention) Since no stains are generated on the paper-making machine during the electrophotographic transfer paper-making process of the present invention, the commercial value of the paper is improved, and the paper-making process is improved because cleaning work etc. is no longer necessary. Efficiency can also be greatly improved. Furthermore, since the N friction coefficient of the obtained transfer paper is within the appropriate range, great effects such as solving the problem of overlapping transfer paper feeding during copying work can be achieved.

Arakawa Chemical Industry Co., Ltd.

Claims (1)

[Claims] An electrophotographic transfer paper containing pulp fiber, a sizing agent, and a calcium carbonate filler as main components, wherein the sizing agent comprises (a) styrenes, and (b) general formula (1) ▲Math. , chemical formulas, tables etc.
and/or (c) general Formula (2) ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (In the formula, R^1, R^2, and R^3 are each the same as those in the general formula (1) above, and B has 1 to It is characterized by being a water-soluble or water-dispersible copolymer comprising as a constituent monomer at least one member selected from aminoacrylamide represented by (3) representing an alkylene group, an acid addition salt thereof, and a quaternary salt thereof. Transfer paper for electrophotography.