JP3474270B2 - Crosslinked polyester resin for toner - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry method used for developing an electrostatic image or a magnetic latent image in electrophotography, electrostatic recording, electrostatic printing, and the like. The present invention relates to a polyester resin useful as a toner, and more particularly, to a crosslinked polyester resin for a toner having high toughness and excellent in low-temperature fixing property, non-offset property, blocking resistance and printing durability. 2. Description of the Related Art In a method for obtaining a permanent visual image from an electrostatic charge image, an electrostatic charge image formed on a photoconductive photoreceptor or an electrostatic recording medium is previously charged by a toner charged by friction. After development, it is fixed. For a magnetic latent image,
After the latent image on the magnetic drum is developed with toner containing a magnetic material, it is fixed. Fixing is performed by directly fusing a toner image obtained by development on a photoconductive photoreceptor or an electrostatic recording medium, or by transferring a toner image onto paper or a film and then fusing it on a transfer sheet. This is done by:
Fusion of toner images is performed by contact with solvent vapor, pressurization and heating. There are two types of heating methods: non-contact heating using an electric oven and pressure heating using a pressure roller. Recently, the latter is mainly used. [0003] Toner used in the dry development system includes 1
There are two-component toners and two-component toners. The two-component toner is first melt-kneaded with a resin, a colorant, a charge control agent and other necessary additives and sufficiently dispersed, and then coarsely pulverized.
Next, it is finely pulverized and classified into a predetermined particle size range to be produced. The one-component toner is similarly manufactured by adding magnetic iron powder in addition to the components of the two-component toner. [0004] Resin is the main component in the compounding of the toner and therefore controls most of the performance required for the toner. For this reason, the resin for the toner is required to have good dispersibility of the colorant in the melt-kneading step in the production of the toner, good pulverizability in the pulverizing step, and the like.
Various performances such as good offset properties, blocking properties, and good electrical properties are required. Epoxy resins, polyester resins, polystyrene resins, methacrylic resins and the like are known as resins used in the production of toners, but styrene and (meth)
Acrylic acid ester copolymers have been used. However, as the performance of copiers and printers has been improved, the points of performance required for the toner resin have also changed. In particular, non-magnetic one-component toners
Since a strong share is applied when charging the toner, a considerable toughness is required for the toner binder resin. Polyester-based cross-linked resin has higher toughness than styrene and (meth) acrylate copolymer,
Although suitable for this field, there is a disadvantage that the fixing performance is reduced when the toughness of the resin is increased. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to have a high toughness, a low-temperature fixing property, An object of the present invention is to provide a crosslinked polyester resin for toner having excellent offset properties, blocking resistance and printing durability. Means for Solving the Problems The inventors of the present invention have made intensive studies to achieve the above-mentioned object, and as a result, have used a specific amount of a specific component for an acid component and an alcohol component and a specific epoxy group. The inventors have found that a polyester resin containing the contained compound as a polymer component and having specific physical properties can achieve the object, and completed the present invention. That is, the present invention provides (a) an aromatic dicarboxylic acid component, (b) at least one of a trivalent or higher polyvalent carboxylic acid component and / or a polyhydric alcohol component, and (c) a compound represented by the following general formula (I). And at least one kind of an aromatic diol component represented by (d), an aliphatic diol component, and (e) an epoxy group-containing compound represented by the following general formula (II). 1 mol% or more and 30 mol% or less based on the total acid component, and the component (c) is 9 mol% or less based on the total acid component.
0 mol% or less, the component (d) is 10% based on the total acid component.
Mol% or more, the component (e) is 0.5% of the total acid component.
A non-linear polycondensate having a glass transition temperature of 40 to 80 ° C. and a softening temperature of 90 to 90 mol% or more and 15 mol% or less.
A crosslinked polyester resin for toner, which is 170 ° C. [Chemical formula 3] [Chemical formula 4] Hereinafter, the present invention will be described in detail. The aromatic dicarboxylic acid (a) used in the present invention is:
It is selected from aromatic dicarboxylic acids such as terephthalic acid and isophthalic acid and lower alkyl esters thereof. Examples of lower alkyl esters of terephthalic acid and isophthalic acid include dimethyl terephthalic acid, dimethyl isophthalic acid, diethyl terephthalic acid, diethyl isophthalic acid, dibutyl terephthalic acid, dibutyl isophthalic acid, and the like. Terephthalic acid and dimethyl isophthalic acid are preferred. The above aromatic dicarboxylic acid raises the glass transition temperature (hereinafter abbreviated as Tg) and contributes to the improvement of blocking resistance, and also has an effect of moisture resistance due to its hydrophobicity. Therefore, the aromatic dicarboxylic acid is used in an amount of at least 80 mol%, preferably at least 90 mol%, based on the total acid components. Of the aromatic dicarboxylic acids, isophthalic acid has the effect of increasing the reactivity, but from the viewpoint of cost, it is preferable to use 50 mol% or less of the total acid components. Terephthalic acid is used to increase the Tg of the resin. It is effective and it is preferable to use 50 mol% or more of all the acid components. The above component (a) is used alone or in combination of two or more. The polyhydric carboxylic acid and / or polyhydric alcohol (b) having 3 or more valences used in the present invention.
Is selected from trivalent or higher polyhydric carboxylic acids and polyhydric alcohols. Examples of trivalent or higher polycarboxylic acids include trimellitic acid, pyromellitic acid, 1,2,2
4-cyclohexanetricarboxylic acid, 2,5,7-naphthalenetricarboxylic acid, 1,2,4-naphthalenetricarboxylic acid, 1,2,5-hexanetricarboxylic acid, 1,
Examples thereof include 2,7,8-octanetetracarboxylic acid and acid anhydrides thereof. Examples of polyhydric alcohols include sorbitol, 1,2,3,6-hexatetralol, 1,4-sorbitan, pentaerythritol, dipentaerythritol, tripentaerythritol, sucrose, 1,2,4-butanetriol, 1,2,5
-Pentatriol, glycerol, 2-methylpropanetriol, 2-methyl-1,2,4-butanetriol, trimethylolethane, trimethylolpropane, 1,3,5-trihydroxymethylbenzene and the like. The component (b) is used alone or in combination of two or more, and has an effect of increasing the Tg of the obtained resin, and has an effect of imparting cohesiveness to the resin and increasing non-offset properties. 1 mol% or more to the acid component 30
It is used in the range of 2 mol% or less, preferably 2 mol% or more and 20 mol% or less. This is because a sufficient effect cannot be obtained if the component (b) is less than 1 mol%, and 30 mol%
It is because it is difficult to control the cross-linking reaction when the ratio exceeds the limit, and the toughness of the polyester resin tends to be reduced. As the aromatic diol (c) used in the present invention, at least one of the aromatic diols represented by the above general formula (I) is used. Examples of the aromatic diol represented by the general formula (I) include polyoxyethylene- (2.0) -2,2-bis (4-hydroxyphenyl) propane and polyoxypropylene- (2.
0) -2,2-bis (4-hydroxyphenyl) propane, polyoxypropylene- (2.2) -polyoxyethylene- (2.0) -2,2-bis (4-hydroxyphenyl) propane, poly Oxypropylene- (6)-
2,2-bis (4-hydroxyphenyl) propane, polyoxypropylene- (2.2) -2,2-bis (4-
Hydroxyphenyl) propane, polyoxypropylene- (2.2) -2,2-bis (4-hydroxyphenyl) propane, polyoxyethylene- (2.3) -2,
2-bis (4-hydroxyphenyl) propane, polyoxypropylene- (2.3) -2,2-bis (4-hydroxyphenyl) propane, polyoxyethylene-
(2.4) -2,2-bis (4-hydroxyphenyl)
Propane, polyoxypropylene- (2.4) -2,2
-Bis (4-hydroxyphenyl) propane, polyoxyethylene- (2.4) -2,2-bis (4-hydroxyphenyl) propane, polyoxyethylene- (3.
3) -2,2-bis (4-hydroxyphenyl) propane, polyoxypropylene- (3.3) -2,2-bis (4-hydroxyphenyl) propane and the like,
One or two or more are used in combination. Among these, polyoxyethylene- (2.3) -2,2-bis (4-hydroxyphenyl) propane and polyoxypropylene- (2.3) -2,2-bis (4-hydroxyphenyl) propane Use is particularly preferred. The aromatic diol has an effect of increasing Tg, so that the blocking resistance is improved. These aromatic diols have poor reactivity, and when used in an amount of 80 mol% or more based on the total acid components, the reactivity is extremely reduced, and the productivity is reduced. Therefore, the aromatic diol is used in an amount of 90 mol% or less, preferably 80 mol% or less based on the total acid components. The aliphatic diol (d) used in the present invention includes ethylene glycol, neopentyl glycol, 1,4-butanediol, diethylene glycol, triethylene glycol, cyclohexanedimethanol, hydrogenated bisphenol A, and the like. And
Ethylene glycol and neopentyl glycol are preferred from the viewpoint of fixability. In particular, ethylene glycol can increase the reactivity. The aliphatic diol is used in an amount of at least 10 mol%, preferably at least 30 mol%, based on all acid components. The epoxy group-containing compound (e) represented by the general formula (II) used in the present invention has an effect of improving fixability while maintaining the toughness of the resin to some extent. Examples of the epoxy group-containing compound (e) represented by the general formula (II) include styrene oxide, phenylglycidyl ether, 2-ethylhexyl glycidyl ether, t-butylphenol glycidyl ether, s-butylphenol glycidyl ether, stearyl glycidyl ether, -Methyloctyl glycidyl ether, α-olefin oxide, and the like, and one or more kinds are used in combination. Among these, the use of a compound having a phenyl group is preferred. The amount of the epoxy group-containing compound represented by the general formula (II) is 0.5 mol% based on the total acid component.
Not less than 15 mol% and preferably not more than 2 mol%.
Not less than 7 mol%. If it is used in an amount exceeding 15 mol%, the toughness and Tg of the resin are greatly reduced, and the toughness,
It is not preferable because the balance between the fixing property and the blocking resistance is lost. If the amount is less than 0.5 mol%, the effect of improving the fixing property cannot be obtained. In the present invention, polymerization components other than those described above can be used in combination according to the required performance as long as the object of the present invention is not impaired. Generally, a monomer known as a raw material of a polyester resin may be used as long as the effects of the present invention are maintained. For example, as the dicarboxylic acid component, sebacic acid, isodecyl succinic acid, fumaric acid, adipic acid and their monomethyl, monoethyl, dimethyl, diethyl esters and the like can be used. These divalent carboxylic acids affect the fixing property and blocking resistance of the toner. Aliphatic sebacic acid and adipic acid improve fixability, but Tg
, The blocking resistance is reduced. This tendency is stronger for aliphatic acids for longer-chain monomers. Therefore, it is necessary to use these characteristics in consideration. The crosslinked polyester resin for a toner of the present invention having the above constitution has a Tg of 40 to 80 ° C, preferably 50 to 70 ° C, and a softening temperature of 90 to 170 ° C, preferably 95 to 160 ° C. is important. If the Tg is lower than 40 ° C., the blocking resistance is poor. On the other hand, if the Tg is higher than 80 ° C., the blocking resistance is good, but the fixing performance is significantly reduced.
When the softening temperature is lower than 90 ° C., the fixing performance is improved, but the cohesive strength of the resin is extremely reduced, and sufficient non-offset property cannot be obtained. Is improved, but the fixing performance is extremely deteriorated. The toughness index of the resin for toner of the present invention is:
It is preferably from 250 μm to 600 μm. A toner using a resin having a toughness index of less than 250 μm,
Since the toughness of the toner is weak, the toner is pulverized during development and the charge amount of the toner is changed, so that a stable image density cannot be obtained. Further, a toner using a resin having a toughness index exceeding 600 μm has a good toner strength and can suppress pulverization of the toner during development and generation of spent toner. However, since the strength of the toner is too strong, Decreases fixing performance, which is an important factor. Therefore,
The toughness index is preferably from 250 μm to 600 μm, more preferably from 300 μm to 550 μm
It is as follows. The toughness index referred to in the present invention is determined by the resin toughness evaluation method described below. Resin toughness evaluation method: A crushed polyester resin is sieved to a particle size of 1400 to 20
Prepare 50 g of a sample of 00 μm. 30 g of the classified sample is finely pulverized with a blender TR-BL manufactured by Trio Science. (Scale 10:30
Second) The sieve whose mass has been weighed is sieved into a sieve having a mesh roughness of 100 μm,
Assemble from the bottom in the order of 50 μm, 250 μm, 500 μm, 710 μm and 1000 μm. 20 g of the finely pulverized material obtained in the above operation is weighed. The finely pulverized material is put into the uppermost part of the screen which has been assembled, and vibrated for 30 minutes using a micro-type electromagnetic vibrating screen M-2 manufactured by Tsutsui Rikakiki. (Scale 10) The weight of the resin on each sieve is weighed. The weight of the resin on each sieve was plotted on a semilogarithmic graph (cumulative weight of each mesh pass).
Read the particle size that the weight percent passes. In the production of the crosslinked polyester resin for a toner of the present invention, the above-mentioned polymerization components (a) to (e) are charged into a reaction vessel, and the temperature is raised to carry out an esterification reaction or a transesterification reaction. At this time, an esterification catalyst or a transesterification catalyst used in a normal esterification reaction or transesterification reaction such as sulfuric acid, titanium butoxide, dibutyltin oxide, magnesium acetate, and manganese acetate can be used if necessary. . Next, water or alcohol generated by the reaction is removed according to a conventional method. Thereafter, the polymerization reaction is carried out successively.
The polymerization is carried out while distilling and removing the diol component under a vacuum of 50 mmHg or less. In the polymerization, generally known polymerization catalysts such as titanium butoxide, dibutyltin oxide, tin acetate, zinc acetate, tin disulfide, antimony trioxide, germanium dioxide and the like can be used. The polymerization temperature and the amount of the catalyst are not particularly limited, and may be arbitrarily set as needed. In the polyester resin for toner of the present invention, if necessary, an inorganic powder such as silica can be added to improve the blocking resistance. The effect of the addition of the silica powder is particularly remarkable when the Tg of the binder resin is low. The present invention will be described below in detail with reference to examples. The performance evaluation in Examples and Comparative Examples was performed using the following method. (1) Tg (glass transition temperature) (° C.) Using a differential scanning calorimeter manufactured by Shimadzu Corporation, temperature was raised to 5 ° C.
The contact point between the tangent line of the endothermic curve near Tg and the baseline when measured at / g was defined as Tg. (2) Softening temperature (° C.) Flow tester (CFT-50, manufactured by Shimadzu Corporation)
0), the temperature at the time when the sample flowed out half under the conditions of a nozzle 1.0 mmφ × 10 mmL, a load of 30 kgf, a temperature rise of 3 ° C./min, and a sample amount of 1.0 g is defined as a softening temperature (° C.).
And (3) Composition analysis The resin was hydrolyzed with hydrazine and quantified by liquid chromatography. (4) Toughness Index Determined by the toughness evaluation method for the above resin. (5) Non-offset property (non-offset fixing temperature width (° C.)) Spread toner uniformly on paper (initial density ID = 1.0 ± 0.3) and pass through a temperature-variable fixing roller. . Next, the tape is peeled from the fixing portion, and the density attenuation rate is obtained. When the temperature of the roller was increased, the temperature at which the fixing rate exceeded 90% was defined as the minimum fixing temperature. The temperature at which the toner began to adhere to the heat roller when the temperature was further increased was defined as the high temperature offset start temperature. A region between the minimum fixing temperature and the high-temperature offset start temperature was defined as a fixable region (non-offset fixing temperature width).
The speed of the fixing roller was set to 100 mm / min, and the nip width was set to 8.0 mm for evaluation. Those having a minimum fixing temperature of 140 ° C. or less and a non-offset fixing temperature width of 70 ° C. or more were considered to exhibit good fixing performance. (6) Blocking resistance 5 g of toner is placed in a 50 ml glass sample bottle.
After standing in a constant temperature bath at 50 ° C. for 50 hours, the mixture was cooled to room temperature, and the degree of aggregation was observed. The degree of aggregation was evaluated by the following method. In the present invention, those having the cohesion degrees A, B, and C were determined to be usable. A: The toner drops just by inverting the sample bottle. B: The toner drops when the sample bottle is turned upside down and shaken lightly. C: The toner drops when the sample bottle is turned upside down and lightly tapped. D: When the sample bottle is turned upside down and strong vibration is applied, toner drops. E: Even if the sample bottle is turned upside down and strong vibration is applied, the toner does not fall. The abbreviations used in the examples and comparative examples represent the following. Diol A: polyoxypropylene- (2.3) -2,
2-bis (4-hydroxyphenyl) propane epoxide A: 2-ethylhexyl glycidyl ether epoxide B: phenol glycidyl ether epoxide C: sec-butylphenol glycidyl ether epoxide D: 2-methyloctyl glycidyl ether epoxide E: styrene oxide epoxide F: α -Dodecene oxide Example 1 The amounts of terephthalic acid, isophthalic acid, trimellitic acid, ethylene glycol, diol A and epoxide A shown in Table 1 were charged into a reaction vessel equipped with a distillation column. further,
0.03 parts by weight of dibutyltin oxide as a catalyst was added to all the acid components, the internal temperature was set to 260 ° C., and the stirring speed was set to 2
The esterification reaction was carried out for 5 hours under a normal pressure while maintaining at 00 rpm. Thereafter, the pressure in the reaction system was reduced to 1.0 mmHg over 30 minutes, the internal temperature was maintained at 240 ° C., and a condensation reaction was carried out for 2 hours while distilling ethylene glycol to obtain a pale yellow transparent resin R-1. Obtained. Table 1 shows the results of the composition analysis and the resin physical properties of the obtained resin R-1. [Table 1] Next, carbon black (Mitsubishi Kasei Co., Ltd., # 40) was added to 94 parts by weight of the obtained resin R-1.
5 parts by weight, a charge control agent (manufactured by Orient Chemical Industry Co., Ltd.
1 part by weight of Bontron S-34) was premixed with a Henschel mixer, and then melt-kneaded at 170 ° C. and 65 rpm using an internal mixer manufactured by Kurimoto Tekko Co., Ltd. After cooling the melt-kneaded product to room temperature, it was roughly pulverized by a hammer mill, and then pulverized to 20 μm or less using a jott mill. Then, using a pneumatic classifier of Nippon Pneumatic Co., Ltd., the particle size was 5 to 20 μm to obtain toner T-1. The toner T-1 was subjected to a non-offset test and a blocking resistance test. Table 2 shows the test results. [Table 2] The resin R-1 has a high toughness.
Toner T-1 had good non-offset properties and blocking resistance, a low minimum fixing temperature, and a sufficient non-offset fixing temperature range. Examples 2 and 3 Resins R-2 to R-3 were obtained in the same manner as in Example 1 except that the polymerization charge composition was changed as shown in Table 3. Resin R
Table 3 shows the composition analysis results and resin physical properties of -2-R-3. [Table 3] Next, using the above resins R-2 to R-3,
The same operation as in Example 1 was performed to obtain toners T-2 to T-3. The obtained toners T-2 to T-3 were subjected to a non-offset test and a blocking resistance test.
Table 4 shows the test results. [Table 4] Resins R-2 and R-3 have high toughness, and toners T-2 and T-3 have good non-offset and blocking resistance, low minimum fixing temperature, and sufficient It had an offset fixing temperature range. Examples 4 to 5 Resins R-4 to R-5 were obtained in the same manner as in Example 1 except that the polymerization charge composition was changed as shown in Table 5. Resin R
Table 5 shows the composition analysis results and resin physical properties of -4 to R-5. [Table 5] Next, using the above resins R-4 to R-5,
The same operation as in Example 1 was performed to obtain toners T-4 to T-5. The obtained toners T-4 to T-5 were subjected to a non-offset test and a blocking resistance test.
Table 6 shows the test results. [Table 6] Resins R-4 and R-5 have high toughness, and toners T-4 and T-5 have good non-offset and blocking resistance, low minimum fixing temperatures, and It had an offset fixing temperature range. Examples 6 to 7 The same operations as in Example 1 were carried out except that the polymerization charge composition was as shown in Table 7, to obtain resins R-6 to R-7. Resin R
Table 7 shows the results of the composition analysis of -6 to R-7 and the physical properties of the resin. [Table 7] Next, using the above resins R-6 to R-7,
The same operation as in Example 1 was performed to obtain toners T-6 to T-7. The obtained toners T-6 and T-7 were subjected to a non-offset test and a blocking resistance test.
Table 8 shows the test results. [Table 8] Resins R-6 and R-7 have high toughness, and toners T-6 and T-7 have good non-offset and blocking resistance, low minimum fixing temperatures, and sufficient It had a non-offset fixing temperature range. Comparative Examples 1 and 2 Resins R-8 to R-9 were obtained in the same manner as in Example 1, except that the composition for polymerization was as shown in Table 9. Resin R
Table 9 shows the results of the composition analysis and the resin physical properties of -8 to R-9. [Table 9] Next, using the above resins R-8 to R-9,
The same operation as in Example 1 was performed to obtain toners T-8 to T-9. The obtained toners T-8 and T-9 were subjected to a non-offset test and a blocking resistance test.
Table 10 shows the test results. [Table 10] Since Epoxy A was not copolymerized with Resin R-8, Tg and toughness were increased, but the minimum fixing temperature of toner T-8 was as high as 170 ° C. Also,
Resin R-9 was obtained by excessively copolymerizing epoxide A,
Due to low Tg and insufficient toughness, toner T-9 had poor blocking resistance and a low minimum fixing temperature, but did not have a sufficient non-offset temperature range. Comparative Examples 3 and 4 Example 1 was repeated except that the polymerization charge composition was as shown in Table 11.
By performing the same operation as described above, Resins R-10 to R-11 were obtained.
Table 11 shows the analysis results and the resin physical properties of the resins R-10 to R-11. [Table 11] Next, the same operation as in Example 1 was carried out using the above-mentioned resins R-10 and R-11 to obtain a toner T-10.
And T-11. The obtained toners T-10 and T-
No. 11 was subjected to a non-offset property test and a blocking resistance test. Table 12 shows the test results. [Table 12] Resin R-10 was low in Tg and toughness because component (b), a polyhydric carboxylic acid and / or polyhydric alcohol having a valency of 3 or more, was excessively copolymerized. For this reason, the toner T-10 had poor blocking resistance and a low minimum fixing temperature, but did not have a sufficient non-offset temperature range. Resin R-11 had low Tg and softening temperature, and could not obtain sufficient toughness, because the trivalent or higher polyvalent carboxylic acid and / or polyhydric alcohol as component (b) was not copolymerized. . Therefore, the toner T-11 has low blocking resistance and has an offset in the entire temperature range. Comparative Examples 5 and 6 Example 1 was repeated except that the polymerization charge composition was as shown in Table 13.
By performing the same operation as described above, Resins R-12 to R-13 were obtained.
Table 13 shows the analysis results and the resin physical properties of the resins R-12 to R-13. [Table 13] Next, the same operation as in Example 1 was carried out using the above-mentioned resins R-12 and R-13 to obtain toner T-12.
And toner T-13. The obtained toner T-12
And toner T-13 were subjected to a non-offset test and a blocking resistance test. Table 14 shows the test results. [Table 14] Since the resin R-12 did not copolymerize the aliphatic diol as the component (d), the condensation polymerization did not proceed sufficiently and the toughness was low. Therefore, the toner T-
In No. 12, the minimum fixing temperature was low, but there was no sufficient non-offset temperature range. The resin R-13 was obtained by copolymerizing an aliphatic dicarboxylic acid in place of the epoxy group-containing compound (e), but the Tg was low and sufficient toughness was not obtained. As a result, the toner T-13 had poor blocking resistance and a low minimum fixing temperature, but did not have a sufficient non-offset temperature range, and offset occurred in the entire temperature range. As described above, the crosslinked polyester resin for toner of the present invention has a high toughness by copolymerizing a specific epoxy group-containing compound.
It has excellent low-temperature fixing properties, non-offset properties, blocking resistance and printing durability, and is used as a dry toner resin for electrostatic images or magnetic latent images in electrophotography, electrostatic recording and electrostatic printing. Useful.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoichi Nagai 4-1, Ushikawa-dori, Toyohashi-shi, Aichi 2 Inside Toyohashi Office of Mitsubishi Rayon Co., Ltd. (72) Inventor Junya Nakamura 4-1-1, Ushikawa-dori, Toyohashi-shi, Aichi (2) References in the Toyohashi Plant of Mitsubishi Rayon Co., Ltd. (56) References JP-A-6-118705 (JP, A) JP-A-62-215962 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB Name) C08G 63/00-63/91

Claims (1)

(57) [Claims] (1) (a) an aromatic dicarboxylic acid component, (b) 3
At least one polyhydric carboxylic acid component and / or polyhydric alcohol component having a valency or higher, (c) the following general formula (I):
At least one aromatic diol component represented by
(D) an aliphatic diol component, and (e) at least one epoxy group-containing compound represented by the following general formula (II), wherein the component (b) is 1 to the total acid component.
The component (c) is 90 mol% or less based on the total acid component, the component (d) is 10 mol% or more based on the total acid component, and the component (e) is a total acid A non-linear polycondensate having a glass transition temperature of from 40 to 80 ° C and a softening temperature of from 90 to 170 ° C, which is from 0.5 mol% to 15 mol% based on the components. For cross-linked polyester resin. Embedded image Embedded image