JPH03200263A - Liquid developer for electrostatic charge image - Google Patents

Abstract

PURPOSE:To decrease the gaseous solvent of a hydrocarbon system generated from a copying machine by adding and incorporating an erucic acid amide compd. into the above liquid developer. CONSTITUTION:The erucic acid amide compd. is added and incorporated into the developing soln. formed by dispersing toner particles constituted of a coloring agent and binder resin into a carrier liquid essentially consisting of a silicone solvent. The erucic acid amide compd. is added in the range of 0.01 to 10 pts. wt., more preferably 0.1 to 5 pts. wt. per 100 pts. wt. liquid developer. The erucic acid amine compd. is adsorbed on the toner particles or is dissolved in a dispersion medium (carrier liquid) and acts as a release agent to a heat fixing roller made of a metal and a blocking resistant characteristic when the erucic acid amide compd. is added to the liquid developer for electrophotography. Thus, the amt. of the gaseous hydrocarbon generated from the copying machine is decreased and the heat roll fixing is possible without generating offsetting even if the fitting roll is not coated with oil.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field 1) The present invention relates to a liquid developer for hot roll fixing used in electrophotography, electrostatic recording, electrostatic printing, and the like.

(Prior art 1) As a liquid developer for heat roll fixing roll, JP-A-63
-301966 to 301969, 64-500
No. 62-50067, No. 64-52167, No. 64-
142560-142561, etc. Since these are carrier liquids mainly composed of aliphatic hydrocarbons, the aliphatic hydrocarbon gas is discharged outside the copying machine, and silicone oil must be supplied to apply to the fixing roll. There were problems such as the copying machine becoming more complex and the number of consumables increasing.

(Objective 1 of the present invention is to reduce hydrocarbon-based solvent gases generated from copying machines.

To make it possible to remove an oil application device to a fixing roll in a hot roll fixing device using a liquid developer, and to save the trouble of oil supply.

By mixing in a certain proportion of nonflammable liquid, the risk of ignition is reduced.

Arrangement 1 of the Invention In recent years, hot roll fixing has been proposed as a method of fixing a liquid developer with high thermal efficiency and capable of high-speed fixing. If a hydrocarbon solvent is used as the carrier liquid and this fixing method is adopted,
Compared to conventional atmospheric fixing, the amount of solvent gas emitted per unit number of sheets is slightly reduced, but a large amount of solvent gas is generated when a large number of sheets are copied at high speed. Also,
It was necessary to apply silicone oil to improve the releasability between the toner layer and the fixing roll. The present invention uses a silicone solvent as a carrier liquid to improve the above-mentioned drawbacks, increase the cohesive force of the toner, and prevent so-called "hot offset".

The silicone solvent used in the present invention includes KF
96 (Shin-Etsu Silicon), 5H200, 5H344 (Toshi Silicon), TSF451 (Toshiba Silicon), etc. In addition, decamethyltetrasiloxane, octamethyltrisiloxane, etc. may be used. In addition, as an aliphatic hydrocarbon solution, petroleum hydrocarbons such as cyclohexane, n-hexane, n-hebutane, n-octane, n-nonane, isooctane, isododecane, ligroin, and mixtures thereof (commercially available products manufactured by Exxon Chemical Co., Ltd. In addition to Isopar E, G, H, and L, there are V, Shell Sol 71 manufactured by Shell Oil Co., and Salt Betsu So 150, etc.), and these may be used by appropriately mixing them. To reduce the transfer agent, the carrier liquid should be less than 1 ocst, preferably 3 ocst.
Cst or less is preferable.

In the present invention, an erucic acid amide compound is added as a means for increasing the cohesive force of the toner.

The electrostatic photographic liquid developer of the present invention has an erucic acid amide compound added to a developer prepared by dispersing toner particles composed of a colorant and a binder resin in a carrier liquid mainly composed of a silicone solvent. A polarity control agent and the like may be further added as necessary.

The erucic acid amide compound has the following formula:
．． It is added in an amount of 0l-10fi parts, preferably 0.1-5 parts by weight.

When an erucic acid amide compound is added to a liquid developer for electrophotography, the erucic acid amide compound is adsorbed to the toner particles or dissolved in the dispersion solvent (carrier liquid), causing it to peel off against the metal heat fixing roller. The agent acts as an anti-blocking property, so that toner is less likely to adhere to the fuser roller. Furthermore, the effect of the erucic acid amide compound in improving the development and transfer characteristics is also recognized.

The coloring materials used in the present invention include Printex V,
Printex U, Printex G, Special Black 15, Special Black 4, Special Black 4-B (manufactured by Degussa), Mitsubishi #44, #30, MR
-11, MA-100 (manufactured by Mitsubishi Kasei Corporation), Raven 1035, Sieben 1252. New Spect N (manufactured by Columbia Carbon), Regal 400.660
, Black Var 900, 1100, 1300, Mogul L (manufactured by Cabot) and other inorganic pigments, and phthalocyanine blue, phthalocyanine green, sky blue, rhodamine lake, malachite green lake,
Methyl violet lake, peacock blue lake,
Naphthol Green B, Naphthol Green Y1 Naphthol Yellow 81 Naphthol Red, Litho-Siferst Yellow 2G, Permanent Red 4R, Brilliant First Scarlet, Hansa Yellow, Benzidine Yellow, Lysole Red, Lake Red C, Lake Red D, Brilliant Carmine 6B, Examples include organic pigments such as Permanent Red F5R, Pigment Scarlet 3B Indigo, Thioindigo Oil Pink and Bordeaux 10B.

In the present invention, these pigments may be used after being coated with a resin or the like in advance. As the coating resin, all resins conventionally used in the production of liquid developers can be used. Typical examples include polyolefin, acrylic resin, rosin-modified resin, styrene-butadiene resin, natural resin, olefin-acrylic copolymer, paraffin wax, and the like. These resins may be used alone or in combination of two or more, and furthermore, other resins may be mixed with these resins.

For example, paraffin wax and polyolefin include the following.

Manufacturer Allied Chemical Kodak Kosei Chemicals Genuine Hoechst Brand AC Polyethylene 1702 AC Polyethylene 617,617A 8C Polyethylene 9,9A AC Polyethylene 430 AC Polyethylene 405 AC Polyethylene 401 AC Polyethylene 540 AC Polyethylene 580 Evolen N-14 Epolene 1 Sea 15 Sunwax +31-P Sunwax 151=P Sunwax +61-P Sunwax 165-P Sunwax +71-P Sunwax E-250r' Sunwax E-300P Paraffin wax PED 521 PED 543 110PED
153 98 cheap crude oil Niolex L 105 Niolex E
100 In particular, the coating treatment involves dispersing the pigment down to the primary particles,
A flushing method is effective for further improving gradation, resolution, image density, etc.

In the flashing method, a pigment or a water-containing paste of the pigment is mixed well together with a resin solution or resin in a kneader called a flasher, and in this process, water existing around the pigment is replaced by the resin solution or resin. ), this is taken out from the kneader, the aqueous phase is discarded, the resin solution or the pigment mixed and dispersed in the resin by heating or at room temperature is dried, the solvent is removed, and the resulting lump is crushed. be. In the present invention, this material is referred to as "flushing pigment".
I will call it . Note that it is also possible to take measures such as removing water and solvent under reduced pressure while kneading with a kneader. In the flushing process, by kneading not only the pigment but also the dye into a slurry with water, almost the same results as the pigment can be obtained. Therefore, in the present invention, the dye that undergoes the flushing process can also be used as a toner component. It is. The appropriate ratio of dye and pigment to resin during flushing is 10 to 60 parts by weight of dye and pigment to 100 parts by weight of resin. In addition, flushing treatment uses humic acid,
It is particularly advantageous to carry out in the presence of humates (Na salts, NH4 salts, etc.) or humic acid salt conductors. The appropriate amount of these humic acids to be added is about 0.1 to 30% by weight of the dye and pigment aqueous solution.

As the resin used for flushing, any of the binder resins conventionally used as binder resins for wet toners can be used, but in particular, in the present invention, an erucic acid amide compound is added to this resin and the resin is manufactured by the flushing method. It is preferable that the In this case, it goes without saying that the amount of the erucic acid amide compound used is in the range of 0.01 to 10 parts by weight based on 100 parts by weight of the liquid developer when the liquid developer is finally prepared. do not have.

Some examples of the production of colorants subjected to flushing treatment are as follows.

Colorant production example-1 200g of water and 2 humic acid ammonium salts in a gallon kneader
Carbon (Mitsubishi #44) 250 in 0g well dissolved
g was added and thoroughly mixed and dispersed in a kneader. Next, 750 g of Evolen E-15 (manufactured by Kodak) and 500 g of erucic acid amide were added and mixed while heating to about 100° C. to separate water.

After further mixing at about 120° C. for 4 hours, the mixture was vacuum dried, cooled, and crushed to obtain a flushing colorant.

Colorant production example-2 200g of water, sodium humate salt lo in a gallon kneader
250 g of carbon (Mogul A, manufactured by Columbia Carbon Co., Ltd.) was added to the well-dissolved solution, and the mixture was thoroughly mixed and dispersed in a kneader. Next, 600 g of Sunwax 151P and 100 g of erucic acid amide were added and kneaded while heating to about 150°C. After further mixing at 120° C. for 2 hours, the mixture was vacuum dried, cooled, and pulverized to produce a flushing colorant.

Flushing colorants of Colorant Production Examples 3 to 10 below were produced according to the procedure of Colorant Production Example 1.

Coloring agent production example-3 Printex V P E 0521 300 fft parts 500 〃 80 〃 25〃 150 〃 Erucic acid amide humate ammonium water coloring agent manufacturing example-4 Printex V Sunwax 250P Erucic acid amide humic acid ammonium water coloring agent production Example-5 Regal 400 Beeswax ammonium erucate humate water 300 parts by weight 00 100 n 5 150 〃 300ff! Parts 00 500 〃 25 〃 250 〃 Coloring agent production example-6 Regal 400 Paraffin wax (64°C) Erucic acid amide humic acid water coloring agent production example-7 Phthalocyanine blue rosin modified maleic acid resin Erucic acid amide humic acid water coloring agent manufacturing example -8 Phthalocyanine green sunwax 171P Erucic acid amide humic acid water colorant production example -9 Thioindigoid 300 parts by weight 00 0 tt 5Q // 50 250 parts by weight 00 00 5Q tt 100 〃 250 parts by weight 80 00 50 〃 100 /7 300 parts by weight Partially cyclized rubber erucamide water coloring agent production example-10 Printex G Alkali blue acrylic resin erucamide calcium humate water 00 100 Too lI 250 parts by weight 50 800 100 5 100 II Use in the present invention A preferred dispersing resin is the general formula %, where n represents an integer from 6 to 20. ) Vinyl monomer A represented by the general formula %) and vinyl pyridine, vinyl pyrrolidone, ethylene glycol dimethacrylate,
Examples include copolymers and graft copolymers of each type of monomer B selected from styrene, divinylbenzene, and vinyltoluene, or several types of monomers.

In addition, in order to improve dispersibility in silicone solvents, silicone material with an acroyl group, LS40 manufactured by Shin-Etsu Silicon Co., Ltd.
Similarly, AK-5 manufactured by Toagosei Kagaku Co., Ltd., TMO701 manufactured by Chisso Co., Ltd., and FM07 may be copolymerized.
11, FMO721 and FMO725 may be used.

These coloring materials, resins, and carrier liquids are put into a dispersing machine such as a ball mill, kitty mill, disk mill, and bottle mill, and then dispersed and mixed to prepare a concentrated toner, which is then dispersed in the carrier liquid of the present invention for development. liquid can be obtained.

(Example 1 In the following examples, all "parts" represent "parts by weight."

Example 1 Colorant (Production Example-1) 50 parts Isopar 820% solution 100 parts 200 parts Isopar H (trade name of EXXSON) was placed in a ball mill and dispersed for 24 hours, then 300 parts of Isopar H was added and dispersed for 1 hour. This was used as a concentrated toner. This 2
00g taken, KPO3 (manufactured by Shin-Etsu Silicone, viscosity 3cst)
) It was diluted in IQ and used as a developer.

Example 2 Colorant (Production Example-2) 60 parts Stearyl methacrylate/methyl metaisobate 1 100 parts A developer was obtained in the same manner as in Example 1.

Example 3 Same as Example 1 except that the coloring agent was replaced with that of Production Example-3.
A developer was prepared in the same manner as above.

Example 4 Special Black - 4300 parts lauryl methacrylate toluacrylic (85/15) copolymer 80 parts Isopar L 200 parts Erucic acid amide 50 parts were placed in an attritor and dispersed for 24 hours, then 300 parts of Isovert I was added and 1 After time dispersion, this was made into a concentrated toner. 200 g of this was taken and diluted in KPO3 (manufactured by Shin-Etsu Silicon, viscosity 3 cst) IQ to prepare a developer.

Comparative Example Comparative developers 1 to 3 were obtained in the same manner as in Examples 1 to 3, except that Isopar H was used as the diluent.

Ricoh! An oil-less fixing test was conducted using a testing machine with the fixing section of ICT5085 improved to a hot roll fixer. The results are shown in the table below.

It can be seen that it is.

Continuous copying was performed using a test copying machine in a closed room, and the solvent gas concentration was measured. When using the comparative developer, the concentration of solvent gas was 300 to 360 ppm, whereas with the developer of the present invention, it was 80 to 360 ppm. The concentration had been halved to 150 ppm.

(Effect 1) By using the developer of the present invention, it is possible to perform hot roll fixing without applying oil to the fixing roll and without causing an offset phenomenon, allowing a compact copying machine to achieve high speed and constant fixation with low energy. The amount of hydrocarbon gas generated by copying machines has also been reduced.

Claims (1)

[Claims] (1) In an electrostatographic liquid developer in which toner particles made of a colorant and resin are dispersed in a high-resistance, low-permittivity carrier liquid containing a silicone solvent as a main component, an erucic acid amide compound is used. A liquid developer for electrostatic images characterized by containing an additive.