JPS60135957A - Electrostatic latent image developing toner - Google Patents

Abstract

PURPOSE:To enable occurrence of offset in heat roll fixing to be avoided by incorporating a bisphenol A type epoxy resin having a specified melt viscosity and a specified amt. of polyethylene wax. CONSTITUTION:A bisphenol characteristics type epoxy resin to be used here needs to have a melt index of 1X10<2>-3X10<4>Pa.s at 120 deg.C, and when <1X10<2> Pa.s, the occurrence of offset cannot be avoided, and when >3X10<4>Pa.s, fixability is deteriorated. The softening point of polyethylene wax is wanted to be in 100-140 deg.C, and it is used in an amt. of 2-30, preferably, 5-20wt% of the total amt. of toner. Any of conventionally known pigments, such as carbon black, rhodamine 6G lake, phthalocyanine blue, phthalocyanine green, Watching Red barium, Fe3O4, and Fe2O3, can be mixed as a colorant with this electrostatic latent image developing toner, in a properly selected amt. of 0.1-60wt% of the total amt. of toner.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to toners for developing electrostatic latent images used in the fields of electrophotography and electrostatic recording. More specifically, it is applied to a heat roll fixing method in this field. This invention relates to a toner for developing electrostatic latent images that does not stain soft polyvinyl chloride sheets.

Traditionally, electrostatic charge latent image developing ton/acrylic used in the heat roll fixing method in the electrophotographic and electrostatic recording fields.
type resin (Japanese Patent Publication No. 55-6895) or styrene resin and low molecular weight polypropylene (Japanese Patent Publication No. 52-330)
4) was known. but,
Such toners have the serious drawback of staining flexible polyvinyl chloride sheets.

On the other hand, epoxy-based toners for developing electrostatic latent images have also been widely used in the fields of electrophotography and electrostatic recording. However, although epoxy toners have better resistance to staining soft polyvinyl chloride sheets (styrene/acrylic) than resin toners, they cannot avoid offset development, making it impossible to apply heat roll fixing methods to oven fixing methods and flash fixing methods. The company had no choice but to use a method with poor thermal efficiency, such as a heat exchanger.

The present invention solves these problems.

That is, the present invention has a melt viscosity of 1X 10 at 120°C.
” Pa-5~3
The present invention relates to a toner for developing electrostatic latent images containing % by weight of polyethylene wax.

In the present invention, the bisphenol A epoxy resin is
Melt viscosity at 120°C is 1 x 102 Pa-s ~ 3
It must be in the range of X 10' Pa-5. If it is less than 1.times.10.sup.2 pa, s, it is impossible to avoid the offset phenomenon during heat roll fixing. On the other hand, if it exceeds +3×10'Pa-5, the fixing performance is poor. The bisphenol A type epoxy resin of the present invention is bisphenol A
obtained by reacting with epichlorohydrin and/or EPIK
A mixture of OTEI 007φ (both -309 and/or a mixture of EPOMIKR-30 and 17 (all trade names, manufactured by Mitsui Petrochemical Epoxy ■).

? 7. Mixture of GY-60 tsuba (all product names, CIBA-GE
(manufactured by IGY Limlted) etc.

In the present invention, the melt viscosity is 9. For example, a high slag flow tester CFT-500 type (Shimadzu Corporation) is used at a load of 10 Kf.
f/CI+]2. Measurements can be made under the conditions of a heating rate of 6°C/min.

In the present invention, the polyethylene wax has a softening point (JI
S K2207 ) is preferably from ioo to 140°C, and is used in an amount of 2 to 30% by weight, preferably 5 to 20% by weight based on the total amount of the toner. If it is less than 2% by weight, it will not be possible to avoid the offset phenomenon during heat roll fixing, and the soft vinyl vinyl chloride sheet will be more likely to be contaminated.

On the other hand, if it exceeds 30% by weight, it becomes difficult to manufacture (pulverize) the toner and the storage stability of the toner also deteriorates. As polyethylene wax.

ACP-6A (product name, manufactured by A11ied Corp.), PA190 (product name, Hoechst A, G,
), Sunwax 131P, 151P, 161P, 1
It is commercially available as 65P, 171P (all trade names, manufactured by Sanyo Chemical Industries, Ltd.), etc.

The toner for developing electrostatic latent images of the present invention may contain any conventionally known pigments as one colorant. For example, carbon black, rhodamine 6G lake, phthalone anine blue, phthalocyanine green, watching red barium triiron tetroxide, iron sesquioxide, etc. are appropriately selected within the range of 0.1 to 60% by weight based on the total amount of toner. It can be blended with

The toner for developing electrostatic latent images of the present invention may contain any conventionally known dyes or pigments as charge control agents. For example, alcohol-soluble nigrosine dyes, fatty acid-modified nigrosine dyes, triphenylmethane dyes, chromium complexes of monoazo dyes, cobalt complexes of monoazo dyes,
A chromium complex of salicylic acid or a derivative thereof may be appropriately selected and blended within approximately 10% by weight based on the total amount of the toner.

If necessary, any conventionally known additives may be appropriately selected and added to the toner for developing electrostatic latent images of the present invention. Examples of additives include polypropylene, (styrene/butadiene) comb, silicon dioxide, zinc stearate, polytetrafluoroethylene, silicone oil, and the like. ~ Any conventionally known developing method can be applied to the toner for developing an electrostatic latent image of the present invention.

For example, it can be dispersed in an alkane or the like and subjected to wet development, or it can be combined with suitable iron oxide powder, glass beads, etc. to perform magnetic brush development or cascade development. Furthermore, a magnetic material may be added to the toner for developing an electrostatic latent image according to the present invention, and the toner may be developed as a magnetic toner by a magnetic brush method or the like.

Furthermore, the toner for developing electrostatic latent images of the present invention can be used for reversal development in addition to regular development, if necessary.

The toner for developing electrostatic latent images of the present invention can be produced by melt-mixing the compounded materials at an appropriate temperature, cooling, and then pulverizing into nine classifications to a desired particle size. Also.

After dissolving or dispersing the compounded materials in a suitable solvent,
It can also be manufactured by methods such as spray drying. That is, the toner for developing electrostatic latent images of the present invention can be produced using any conventionally known technique.

Next, an example of the present invention will be shown.

Example 1 EPIK, OTE 1007 (trade name, Binuphenol A type epoxy resin made by Yuka Shell Epoxy ■) 70 weight tons
%, ACP-6AC trade name, polyethylene wax manufactured by Allied Corporation (A11ied Corp), softening point 120°C] 15 tir, Carbon Black≠44 (trade name, carbon black manufactured by Mitsubishi Chemical Corporation) 10 weight Ji% and oil black 5% by weight of BY (trade name, fatty acid-modified nigron manufactured by Orient Chemical Industry Co., Ltd.) was mixed and then melt-kneaded. This is coarsely pulverized using a non-merger mill, and then finely pulverized using an air-jet type pulverizer.

The toner A having a particle size of 5 μm to 30 μm was obtained by classification.

What is the melt viscosity of EPIKOTE 1007 at 120°C?

2 x 103 Pa, s is β.

To the above toner, 6 volumes and EFV200/300 carrier (product name 9 iron oxide powder carrier manufactured by Japanese iron powder ■, 200 ~
A selenium photoreceptor (drum-shaped) rotating at a peripheral speed of about 70 cm/sec was uniformly charged with a corona voltage of +6 KV, and then exposed to light through a negative original.

This is reversely developed using the above developer, then transferred to plain paper, and offset-resistant film is created by gradually changing the temperature of the roll using a heat roll fixing device (Teflon coated roll on the upper side and silicone rubber coated roll on the lower side). We conducted an evaluation. Further, the fixing properties of the obtained fixed images were evaluated by a Scotch dip-and-crisp test. Furthermore, a fixed image obtained at a roll temperature of 200°C was added to a soft polyvinyl chloride sheet containing 30% dioctyl phthalate.
(0,5no thickness) and 10.0 g f 7c at 60℃
A pressure of m2 was applied to the contact, and the time required for the soft polyvinyl chloride sheet to become contaminated was observed. These results are summarized in Table 1.

Example 2 In Example 1, 1 part by weight of EPIKOTE1007 and BPIKOTE1 were used instead of EPIKOTE1007.
Toner B was prepared in exactly the same manner except that 2 parts by weight of the mixture of 009 (trade name, bisphenol A type epoxy resin manufactured by Yuka Shell Epoxy ■) was used. The melt viscosity of the mixture at 120°C was 1 x 10' Pa-5.

A developer was prepared using the above Toner B in the same manner as in Example 1, and the offset resistance, fixing performance, and soft vinyl chloride sheet stain resistance were evaluated. These results are summarized in Table 1.

Example 3 In Example 1, 1 part by weight of EPIKOTE 1007 and EPIKOTE 1 were used instead of EPIKOTE 1007.
Toner C was prepared in exactly the same manner except that 1 part by weight of the mixture was used (trade name: bisphenol A type epoxy resin manufactured by Yuka Shell Epoxy ■).

EPIKOTE 10071 parts by weight and EPIKOTE1
004 The melt viscosity of 1 part by weight of the mixture at 120°C is 3
X 102 Pa-s.

A developer was prepared using the above Toner C in the same manner as in Example 1, and the offset resistance, fixing performance, and soft vinyl chloride sheet stain resistance were evaluated. These results are summarized in Table 1.

Example 4 Except for using 5% by weight of ACP-6A in Example 1, (
Toner Df: was prepared in exactly the same manner (by increasing the amount of epoxy resin by decreasing the amount of ACP-6A).

A developer was prepared using the above-mentioned Toner D in the same manner as in Example 1, and the offset resistance, fixing performance, and soft polyvinyl chloride sheet stain resistance were evaluated.

These results are summarized in Table 1.

Example 5 Toner E was prepared in exactly the same manner as in Example 1, except that 20% of ACP-6A was used (the amount of epoxy resin was decreased in proportion to the increase in ACP-6A).

A developer was prepared using the above-mentioned toner E in the same manner as in Example 1, and the offset resistance, fixing performance, and soft polyvinyl chloride sheet stain resistance were evaluated.

These results are summarized in Table 1.

Comparative Example 1 Toner F was prepared in exactly the same manner as in Example 1 except that EPIKOTE 1004 (trade name, bisphenol A type epoxy resin manufactured by Yuka Shell Epoxy ■) was used instead of EPIKOTE 1oo7.

The melt viscosity of EPIKOTEl 004 at 120°C was 1 x 102 Pa-s.

A developer was prepared using the above-mentioned toner F in the same manner as in Example 1, and the Il''l offset property, fixing property, and soft polyvinyl chloride sheet stain resistance were evaluated.

These results are summarized in Table 1.

Comparative Example 2 Toner G was prepared in exactly the same manner as in Example 4 except that EPIKOTE 1009 was used instead of EPIKOTE 1007.

A developer was prepared using the above Toner G in the same manner as in Example 1, and the offset resistance, fixing performance, and soft polyvinyl chloride sheet stain resistance were evaluated.

These results are summarized in Table 1. Eplo (19 of 12
The melt viscosity at 0°C is 3 x 10', 'Pa-5
Met.

Comparative Example 3 Toner H was prepared in exactly the same manner as in Example 1, except that 35% by weight of ACP-6A was used (the amount of resin was reduced by □ as ACP-6AP3 was increased).

A developer was prepared using the above Toner H in the same manner as in Example 1, and the offset resistance, fixing performance, and soft polyvinyl chloride sheet stain resistance were evaluated.

These results are summarized in Table 1.

Comparative Example 4 Except for using 1% by weight of ACP-6A in Example 1, (
Toner (2) was prepared in exactly the same manner (the amount of resin was increased by the amount of ACP-6A reduced).

A developer was prepared using the above toner in the same manner as in Example 1, and the offset resistance, fixing property, and staining property of a soft polyvinyl chloride sheet were evaluated. These results are summarized in Table 1.

Comparative Example 5 E Pu1v instead of ACP-6A in Example 1
Toner J was prepared in exactly the same manner except that er (trade name + ester wax manufactured by Hoechst A, G) was used.

A developer was prepared using the above-mentioned Toner J in the same manner as in Example 1, and the offset resistance, fixing performance, and soft polyvinyl chloride sheet stain resistance were evaluated.

These results are summarized in Table 1.

Comparative Example 6 Toner K was prepared in exactly the same manner as in Example 1 except that Sunwax E-250P (trade name, oxidized polyethylene wax manufactured by Sanyo Chemical Industries Ltd., softening point 104°C) was used instead of ACP-6A. did.

A developer was prepared using the above Toner K in the same manner as in Example 1, and the offset resistance, fixing performance, and soft polyvinyl chloride root stain U resistance were evaluated.

These results are summarized in Table 1.

Comparative Example 7 In Example 1, AP-1 (trade name 1 amide wax manufactured by Nippon Kasei ■, softening point 100°C) was used instead of ACP-6A.
Toner L was prepared in exactly the same manner except that the following was used.

A developer was prepared using the above-mentioned toner L in the same manner as in Example 1, and the offset resistance, fixing performance, and soft polyvinyl chloride sheet stain resistance were evaluated.

These results are summarized in Table 1.

Comparative Example 8 In Example 1, instead of EP IKO'TE 1007 and ACP-6A, Hymer 88M-90Of: trade name, 980% by weight of (styrene/butyl methacrylate) resin manufactured by Sanyo Chemical Industries, Ltd. and Viscoel 660P (trade name, Low molecular weight polypropylene manufactured by Sanyo Chemical Industries ■, softening point 1
Toner M was prepared in the same manner except that 5% by weight (45°C) was used.
was prepared. The weight average molecular weight MW of Hymer, 9th M-900 is 205.000, and the weight average molecular weight, number power weight, and number average molecular weight, which are indicators of 9 molecular weight 1 distribution, were determined by GPC method (measurement solvent tetrahydrofuran, flow rate 2 m 137 m
i n, monodisperse standard polystyrene standard). The melt viscosity of Hymer SBM-900 at 120°C is 4 x 1
It was o8poise.

Note in the margin below: 0 Evaluation of fixing property 2 0: No tape/crisp X: With tape peeling O: Evaluation of offset resistance 2 0: No offset

O Storage stability: ○ indicates no agglomerated particles × indicates agglomerated particles Each toner was subjected to a heat history of 50°C for 18 hours, and the powder state of the toner was examined. The feature is that a toner containing epoxy resin and a specific proportion of polyethylene wax is applied to a heat roll fixing method. As exemplified in the examples, it can be seen that such a toner has the characteristics of good offset resistance during heat roll fixing and extremely excellent resistance to staining the soft polyvinyl chloride sheet.

Claims (1)

[Claims] 1. Melt viscosity at 120℃ is 1 x 102Pa-s
A toner for developing electrostatic latent images comprising a bisphenol A type epoxy resin of ~3X 10' Pa-5 and 2 to 30% by weight of polyethylene wax based on the total amount of the toner.