JPS60100149A - Transfer sheet - Google Patents

Abstract

PURPOSE:To improve transfer performance, etc. by forming a transfer layer contg. cellulose ester and a specified plasticizer also having an antistatic action on the surface of a plastic film. CONSTITUTION:A transfer layer formed on at least one side of a transparent plastic film is composed essentially of cellulose ester, a high-boiling solvent, except org. phosphates, having >=200 deg.C b.p. at a pressure of <=760mmHg, and at least one of org. phosphates represented by formulae (1), (2), and (3) in which R is 8-30C alkyl or alkylphenyl having such C alkyl, and n is an integer of 1-10 expressing the number of moles of added ethylene oxide. Cellulose esters are easy to curl by change of temp. and humidity, and it cannot attain low surface resistance, but it can be improved by combining it with said phosphate and said high-boiling solvent, thus enhancing transfer and fixing performances.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a transfer sheet for RPC (plain paper copying) used as an original film for projection, a second original film for diazo copying, and the like.

In an electrophotographic transfer system using a conventional PPC copying machine, a toner image formed on a photoreceptor is transferred and fixed onto a transfer sheet to form a copy. As a transfer sheet, plain paper is generally used for construction copies, and polyester, cellulose acetate,
A transparent material such as a plastic film such as polycarbonate is used. Not limited to transparent or opaque, general requirements for transfer sheets include good transferability and fixation (adhesiveness) for toner images, the ability to form high-quality transferred images without wrinkles or crushing, and copying. It has good matching performance with the machine (paper feeding performance or conveyance performance), and there is no single feed or jam (sheet jam) during copying.
For example, it is good to stack copies neatly in the copy receiver of the copying machine. The transferability of toner images is related to the charging properties of the sheet, and if the sheet is locally charged during transportation, the toner that should be transferred to that area during transfer will scatter, causing the image area to appear white. , so-called halation occurs.

However, the transfer sheet made of a glass film as described above only satisfies some of the above requirements, and for this reason, for example, if the constant disintegration property of toner images is to be improved, an acrylic resin-based material may be used on one side of the film. Providing a fixing layer (%Kokai No. 50-32944, Special Publication No. 51-347)
34, etc.), 7 - To prevent radiation, that is, to improve the transferability of toner images, add a polymer electrolyte as a conductive agent to the matte fixing layer made of various resins and fillers such as silica and glass powder. Measures have been taken. However, even with these transfer sheets, it was difficult to satisfy all of the above requirements.

Purpose The purpose of the present invention is to provide a transfer sheet that has excellent transferability and fixation properties for toner images, can form high-quality transferred images, has excellent conveyance or paper feeding properties, has little curling, and has good stockability. It is to be.

composition The basic structure of the transfer sheet of the present invention is as follows.

a) Cellulose ester on at least one side of the plastic film support with the general formula % (3) (However, in the above formula, R is an alkyl group having 8 to 30 carbon atoms or alkylphenyl having 8 to 30 carbon atoms in the alkyl moiety. base, n
is the number of moles of ethylene oxide added, and represents an integer from 1 to 10.
A fixing layer whose main component is a high-boiling point solvent of

The present inventors have found that among various rod resins, cellulose esters have excellent toner adhesion properties and are also less irritating and cause irritation. Note that the reason why halation is difficult to occur is considered to be because the volume resistivity is relatively low. However, as a film, cellulose esters tend to curl due to changes in temperature and humidity, and because they do not have an appropriately low surface resistance value, it is difficult to form sharp, high-resolution transfer images, and they are difficult to transport. There are disadvantages such as there are also females.

Therefore, the present inventors investigated (1) and found that by adding phosphoric esters of the general formulas (1) to (3) as plasticizers and antistatic agents and a high boiling point solvent as a plasticizer, the above drawbacks could be overcome. I found out. The present invention is based on such knowledge.

As described above, the fixing layer of the present invention is mainly composed of a cellulose ester, a phosphoric ester represented by formulas (1) to (3), and a high boiling point solvent having a boiling point of 200° C. or more (760+tHg or less). Examples of cellulose esters include cellulose cellulose, cellulose acetate, cellulose acetate propionate, and cellulose acetate butyrate. These cellulose esters can be blended with thermoplastic resins such as acrylic resins, styrene resins, polyester resins, and vinyl acetate resins, and thermosetting resins such as urethane resins and epoxy resins, up to 40% of the total amount of resin. .

Next, as mentioned above, the phosphoric acid esters of general formulas (1) to (3) are used as plasticizers to prevent curling of the transfer sheet, and to improve the transferability and lower the surface resistance. used for. All of these phosphoric acid esters are powders and are easily available as commercial products. Specific examples thereof are shown in Table 1 below.

High boiling point solvents with a boiling point of 200℃ or higher (760℃Hg)
The following solvents may be used, such as di(2-ethylhexyl dicyhinate) (bp).

215°C15t (g), diisodecyl adibate (
bp.

Dibasic acid esters such as 239-b-ethylhexyl) (bp, 238°C 15lr(g); butyl oleate (bp.

190-230℃ 15-・+, ++ (2), butyl stearate (bp, 220-225℃ 725maHg
) Fatty acid ester of QI; ##l'%tIJ (2-ethylhexyl) (bp.

220-250°Cl3mmHg), phosphorus resistance mitriphenyl (bp.

370C/760 11g), tricresyl phosphate (bp
.

410~b 71 ru ('Ji') J fk (bp, 282℃77
60m+AHg), diethyl phthalate (bp, 29
8°C/760mt1Kg), phthalate dibutyl (b
p, 340℃/760m+iHg), "yphv diocchi# (bp, 386℃/76 (1mi)Ig),
Examples include phthalic acid esters such as cyethylene glycol dihenzoe) (bp, 240"CC15i1H); methyl phthalethyl glycole) (bp, 310°C/760 tIg). These are the general plasticizers mentioned above. Since it acts differently from the phosphoric esters of formulas (1) to (3), it is used to reduce curling and improve transportability like these phosphoric esters.

Note that a solvent with a boiling point of less than 200°C cannot be used because curling tends to increase over time. In any case, the amount of phosphoric acid ester and high boiling point solvent of general formulas (1) to (3) to be used is such that the surface resistance of the transfer sheet is 10'' to 10'2.
Ω・CrrLf) range. This is because if it is less than 109Ω#α, the transfer efficiency of the toner image will decrease, and if it exceeds 10"Ω, halation will occur or image distortion will occur.For this reason, general formulas (1) to ( The phosphoric acid ester and high boiling point solvent of 3) are used in the range of fixing layer weight (2 to 10 parts and 2 to 20 parts to the hoe).If the amount of phosphoric acid ester used is less than 2 parts, the antistatic effect and plasticizing There is almost no effect, and if the amount exceeds 10%, the surface becomes sticky and the surface resistance decreases extremely, causing scumming.On the other hand, if the amount of high boiling point solvent used is less than 2%, tnJ The plastic effect hardly appears and the curl becomes large, and when the temperature exceeds 201 Y, the surface becomes sticky, and when stored in layers, they stick together, causing a so-called blocking phenomenon.

In addition to the above ingredients, the fixing layer also contains fillers, lubricants, dispersants,
A coloring agent or the like can be added in an amount that does not significantly affect the transparency and other properties of the transfer sheet (particularly, fillers are involved in transportability). Fillers include silica, glass powder, inorganic materials such as Merck, cellulose powder,
Organic materials such as phenol resin powder and melamine resin powder are used, silicone oil, fluororesin, paraffin wax, stearic acid, etc. are used as lubricants, sodium alkylbenzenesulfonate is used as dispersants, and various dyes or pigments are used as colorants. Ru.

The fixing layer is a solution of a low boiling point solvent containing cellulose ester, a phosphoric ester of general formulas (1) to (3), and a high boiling point solvent r as main components on a plastic film support such as polyester, cellulose acetate, or polycarzenate. The cloth can be dried and sunk.

The appropriate thickness after drying is about 5 to 15 μm.

The fixing layer as described above can also be provided on both sides of the plastic film support so that copies can be made on either side.

Furthermore, if necessary, in order to improve the adhesion between the plastic film support and the fixing layer, a precoat layer (e.g., vinylidene chloride resin or saturated polyester resin) with a thickness of 1 to 100 ml may be added between the fixing layer and the support. 5μmVcm cloth 1-ru)
It is also possible to provide

Also, on the opposite side of the fixing layer, a matte layer (for example, a matting agent and a thermosetting resin with a thickness of 5 to 1
It is also possible to provide a canvas with a diameter of 0 μm.

Examples of these transfer sheets are shown in FIGS. 1-6.

In the figure, 1 is a support, 2 is a fixing layer, 3 is a matting layer, and 4 is a precoat layer.

Effects As described above, the main components of the fixing layer include cellulose ester that has excellent toner adhesion, phosphoric esters of the general formulas (1) to (3) as plasticizers and antistatic agents, and phosphoric esters as plasticizers. Since the transfer sheet of the present invention uses the above-mentioned high boiling point solvent that acts mutually, the transfer sheet of the present invention has excellent toner image transfer and fixing properties, is free from halation, can form high-resolution transferred images, and is easy to copy. 7. Good matching with the machine, excellent conveyance and paper feeding properties, and less curling.
It can satisfy all the conditions necessary for a transfer sheet, such as <c< and good stockability.

Examples of the present invention are shown below, and all parts are based on weight.

Examples 1 to 7 and Comparative Examples 1 to 5 Transfer sheets were created using the short layer materials shown in Tables 2 and 3 according to the following method and the description of the layers.

Formation method of fixing layer: Fixing layer material is methylseronlupe acetate/acetone=
・Viscosify or disperse in a mixed solvent of 4/□ so that the solid content concentration is approximately 15%, and apply this to a 75 μm) IJ- polyester film or precoat layer with a film thickness of 7 μr after drying.
Apply it with a wire parr so that it becomes rLvC, and
Dry for 1 minute + 1 JI.

Pre-coat layer formation method 2.5 parts of Nialon CX-8-2 (vinylidene chloride/acrylic acid ester copolymer manufactured by Toagosei Co., Ltd.) was mixed with 100 parts of toluene.
After drying it, the adhesion amount was 3 μ/II (J
It was coated on the polyester film with a wire nozzle so that the baseness was 3 μm) and dried at 100° C. for 1 minute.

Formation method of bank coat layer: 80 parts of Hytaloid 3008 (acrylic polyol resin manufactured by Hitachi Chemical Co., Ltd.), 13 parts of Cyroid 308 (silica powder manufactured by Fuji Davison Co., Ltd.), and 70 parts of Sumidur N-15 (fatty isocyanate manufactured by Sumitomo Bayer Co., Ltd.) 91/m" (thickness approximately 10 μrrL) on the opposite side of the polyester film provided with the fixing layer.
), and after drying at 120°C for 1 minute, curing was performed at 150°C for 5 minutes.

Margin table below -3 i) CAB: Cellulose acetate butyrate CA
P: Cellulose acetate propionate DOA:
Ashihin (2-ethylhexyl) TOP: Tri(2-ethylhexyl) phosphate DMP: Dimethyl fumerate 63.6fi: *Silica powder Sung vinylol 23S manufactured by Shi Davison Co., Ltd. Polyvinyl acetate manufactured by Showa Kobunshi Co., Ltd. Copies were made using a commercially available PPC copying machine using the transfer sheet obtained as described above.
Regarding long sheets, paper feeding performance, conveyance performance (jamming), stockability, and curling were investigated. The results are shown in Table-3 and Clothes-
4.

Table-3 Table-4

[Brief explanation of the drawing]

FIGS. 1 to 6 are diagrams showing the construction of an example of the transfer sheet of the present invention, respectively. 1...Plastic film support 2...Fixing layer 3...Back coat layer 4...Precoat layer Patent applicant Rico Co., Ltd. -

Claims (1)

[Claims] 1. At least one side of the plastic film support is coated with cellulose ester and the general formula % (2) (3) (wherein R in the above formula is an alkyl group having 8 to 30 carbon atoms or an alkyl moiety). Alkylphenyl group having 8 to 30 carbon atoms, n
is the number of moles of ethylene oxide added and represents an integer from 1 to 10.
-) A transfer sheet provided with a fixing layer containing a high boiling point solvent as a main component.