JP2001032189A - Heat-resistant paper-like material and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heat-resistant paper-like material having thin thickness and uniform formation by fibrillating a main fiber composed of a heat-resistant polymer fiber, then mixing the fibrillated material with a high melting point binder fiber or subjecting the fibrillated material to wet papermaking without mixing with the above fiber and subjecting the resultant primary sheet to heat press roll treatment. SOLUTION: Ten to one hundred wt.% of a main fiber composed of a heat- resistant polymer fiber, e.g. polyparaphenylene benzbisoxazol fiber is fibrillated so as to have <=500 ml Canadian standard freeness and then subjected to wet papermaking to form a primary sheet and subjected to heat press roll treatment to bind the fibrillated fibers to each other by entangling of these fibers or 60-100 wt.% main fiber subjected to above fibrillation treatment is subjected to wet blending with 10-40 wt.% high melting point binder fiber having >=150 deg.C melting point, e.g. polyparaphenylene sulfide fiber to form a primar sheet and then subjected to heat pressure roll treatment. Thereby, main fibers are bound to each other by melting of the above binder fiber to provide the objective heat-resistant paper-like material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-resistant paper and a method for producing the same.

[0002]

2. Description of the Related Art A paper-like material mainly composed of synthetic fibers obtained by a wet papermaking method is weakly entangled with each other. For the purpose of improving paper strength, binder fibers are mixed and dried in a drying part of a papermaking apparatus. Melting the binder fiber and binding the main fibers are performed.

[0003]

The temperature of the dryer portion of a general papermaking apparatus used for papermaking is about 100 ° C. to 140 ° C. because of the purpose of drying moisture. In other words, when a paper-like material mainly composed of synthetic fibers is produced by the papermaking apparatus, a binder fiber for binding the main fibers is melted at the temperature of the dryer portion as a binder fiber as described below. The melting point binder fiber was incorporated in the paper-like material in an amount of 0.1 to 20% by weight.

That is, the low-melting binder fiber blended in the heat-resistant paper-like material according to the prior art includes polyolefins such as polyethylene and polypropylene, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, polyvinyl acetate, ethylene acetate. A single component composed of a polymer such as a vinyl acetate copolymer or an ethylene-acrylic acid copolymer, or a multicomponent fiber containing at least one kind of the polymer, a sheath-core type, a side-by-side type, a split type, etc. And fibers that have been fibrillated, and commonly used fibers can be used without limitation in a wet papermaking method.

[0005] In a case where a heat-resistant paper-like material is formed by using a fiber having excellent heat resistance as a main fiber in a general papermaking apparatus,
The capacity of the dryer portion of the papermaking apparatus is limited, and the binder fiber must use a material having a relatively low melting point, and it is difficult to sufficiently exhibit the heat resistance of the main fiber. An object of the present invention is to fibrillate the main fibers to strengthen the entanglement of the main fibers, and to use the binder without using a binder or using a small amount of a high-melting binder fiber without using a low-melting binder. A tissue paper that solves the problem of fiber and has a sufficient heat resistance of the main fiber only with the main fiber, or a thin paper in which the paper strength is further improved by using a high melting point binder fiber and the heat resistance is not impaired It is an object of the present invention to provide a state-of-the-art material and a method for producing the same using a general papermaking apparatus used for papermaking.

[0006]

As a result of various studies to solve the above problems, the present inventors have found that heat-resistant paper in which fibers are bound together only by entanglement of fibrillated heat-resistant main fibers. A heat-resistant paper-like material, which is obtained by mixing a heat-resistant main fiber and a high-melting binder fiber which are fibrillated and a high-melting binder fiber, and mutually fusing the main fiber with the high-melting binder fiber using a thermocompression bonding roll to form a paper-like material; It is intended to provide a manufacturing method.

[0007] The present invention is specifically as described below. The heat-resistant paper-like material of the present invention is mainly composed of a heat-resistant main fiber that is a heat-resistant polymer fiber and a high-melting binder fiber, and the heat-resistant main fiber occupying in the total weight of the paper-like material. The amount is 60 to 100% by weight (claim 1);
The heat-resistant paper-like material according to claim 1, wherein the heat-resistant main fiber is a fibrillated heat-resistant paper-like material, and a preferable high-melting binder fiber has a melting point of 150 ° C or more. Claim 2) In the heat-resistant main fiber which is a heat-resistant polymer fiber, the amount of the fibrillated fiber in the total weight of the heat-resistant main fiber is 10 to 10.
The heat-resistant paper-like material according to claim 1, wherein the amount of the non-fibrillated fiber is 0 to 90% by weight at 100% by weight (Claim 3).

In the method for producing a heat-resistant paper-like material according to the present invention, a heat-resistant polymer fiber, which is a heat-resistant main fiber, is fibrillated and then made into a paper by a wet paper-making method to form a primary sheet. Then, the primary sheet is supplied to a thermocompression roll to provide a heat-resistant paper-like material (Claim 4), wherein a heat-resistant main fiber, which is a heat-resistant polymer fiber, and a high-melting binder fiber, A method for producing a heat-resistant paper-like material, characterized in that a primary sheet is prepared by blending by a wet papermaking method, and then the primary sheet is supplied to a thermocompression roll (claim 5).

Further, a primary sheet is prepared by subjecting a main fiber obtained by fibrillating a heat-resistant main fiber, which is a heat-resistant polymer fiber, to a non-fibrillated main fiber by a wet papermaking method. A method for producing a heat-resistant paper-like material, which comprises subjecting the primary sheet to a thermocompression roll afterwards (claim 6), wherein a main fiber obtained by fibrillating a heat-resistant main fiber which is a heat-resistant polymer fiber; A non-fibrillated main fiber and a high melting point binder fiber
A method for producing a heat-resistant paper-like material, characterized in that a primary sheet is prepared by papermaking by a wet papermaking method, and then the primary sheet is supplied to a thermocompression roll (claim 7).

Further, the amount of the heat-resistant main fiber in the sheet is 60 to 100% by weight, and the amount of the high melting point binder fiber is 0 to 40% by weight.
8. The method for producing a heat-resistant paper-like material according to claim 5, 6 or 7, wherein the high-melting binder fiber has a melting point of 15%.
The method for producing a heat-resistant paper-like material according to claim 4, wherein the temperature is 0 ° C. or higher (claim 9).
The heat-resistant main fiber is fibrillated to a Canadian standard freeness of 500 ml or less.
A method for producing a heat-resistant paper-like material according to claim 5, 6, or 7 (claim 10).

In the above, the heat-resistant polymer fibers, which are heat-resistant polymer fibers, are fibrillated to strengthen the entanglement between the heat-resistant polymer fibers and are bound only by the entanglement between the heat-resistant polymer fibers. It is an object of the present invention to provide a heat-resistant paper-like material or a material which is bound by the melting of a high-melting binder fiber by adding a high-melting binder fiber.

The material of the heat-resistant paper-like material of the present invention will be described. As the heat-resistant fiber, a fiber made of a heat-resistant polymer such as para-aramid, phenol resin, polyparaphenylene benzobisoxazole (hereinafter abbreviated as PBO fiber), polyimide, and polytetrafluoroethylene can be used. Among them, PBO fibers can be suitably used in the present invention because of their excellent heat resistance, water resistance and fiber strength.

The high melting point binder fiber used in the present invention preferably has a melting point of 150 ° C. or more as measured by a differential scanning calorimeter (DSC). In this case 150
It is not preferable that the temperature is lower than 0 ° C., because a problem occurs in that a paper having sufficient heat resistance cannot be obtained. Specifically, polyparaphenylene sulfide fiber, wholly aromatic polyester fiber, tetrafluoroethylene-hexafluoropropylene copolymer fiber, etc. can be applied to the present invention.

Since the heat-resistant main fiber directly contributes to the thermal properties and the like of the heat-resistant paper-like material of the present invention, it is necessary to select a combination with the high-melting-point binder fiber according to the application. The compounding ratio of the heat-resistant main fiber constituting the paper-like material of the present invention is 6
0% by weight to 100% by weight. In order to bring the characteristics of the heat-resistant main fiber as close as possible to a 100% heat-resistant paper-like material, the smaller the high melting point binder, the better. Most desirable to maintain. When additional paper strength is required for the heat-resistant paper-like material, a high-melting binder fiber is added. As the high melting point binder fiber is added, the paper strength of the heat-resistant paper-like material is improved. In this case, if the high melting point binder fiber is larger than 40% by weight, that is, if the main fiber is less than 60% by weight, it is not preferable because the heat resistance of the main fiber itself cannot be sufficiently exhibited.

In claim 3, the amount of the fibrillated fiber is numerically limited to 10 to 100% by weight. In this case, if the amount of fibrillated fiber is less than 10% by weight,
The entanglement between fibers is weak, and sufficient sheet strength cannot be obtained. However, on the other hand, the smaller the amount of the fibrillated fibers, the more porous the sheet. Therefore, when the sheet is used as a core material for a prepreg and a printed circuit board, the impregnation of the sheet with the resin is improved. That is, the porous sheet is suitable for use in a printed wiring board because the resin easily enters the sheet and has good resin impregnation. As the amount of the fibrillated fibers increases, the sheet becomes denser and becomes less porous, so that the impregnating property of the resin deteriorates. Thus, for applications where impregnation is required, the amount of fibrillated fibers is reduced, while for applications where impregnation is not required, greater amounts of fibrillated fibers are used. In short, according to the present invention, the fibrillated heat-resistant fiber and the non-fibrillated heat-resistant fiber are selected and used in an appropriate ratio according to the application. In order to balance resin impregnation and sheet strength, the amount of non-fibrillated fibers must be 1
0 to 50% by weight is preferred.

As described above, in the method for producing a heat-resistant paper-like material of the present invention, at least 10 to 100% by weight of a heat-resistant main fiber which is fibrillated is made into a paper by a wet papermaking method, and only the entanglement of the main fibers is performed. A primary sheet is created by binding the main fibers to each other and then subjected to a thermocompression roll to strengthen the entanglement between the main fibers, or a heat-resistant polymer fiber that is a heat-resistant polymer fiber and a high-melting binder. Are mixed by a wet papermaking method, a primary sheet is created by binding the main fibers only by entanglement of the main fibers, and then the high melting point binder fiber is provided by subjecting the primary sheet to a thermocompression roll. It is characterized by melting and binding between the main fibers.

That is, in the production method of the present invention, a wet papermaking method used for ordinary papermaking is used. That is, the production method of the present invention provides at least 10 to 1
Only the heat-resistant main fiber of which 00% by weight is fibrillated,
Alternatively, the fibrillated heat-resistant main fiber,
A high-melting-point binder fiber is weighed in a prescribed amount, stirred in water and mixed and disintegrated. Preferably, a slurry whose concentration is adjusted so that the solid content concentration is 0.5% or less is obtained by a wet method such as a long net type or a circular net type. Applying to a paper machine, dehydrating with a continuous wire mesh dehydrating part, then drying with a multi-cylinder dryer or Yankee dryer to obtain a primary sheet, and then applying the primary sheet to a thermocompression roll It is. At that time, without using the high melting point binder fiber, the primary sheet obtained only with the main fibers, the main fibers are bound together by the entanglement of the main fibers, and further processed by the pressure treatment step with the next thermocompression roll, Entanglement between the main fibers is further strengthened, and sufficient strength is provided. Also, in the primary sheet using the high melting point binder fiber, the main fibers are bound by the entanglement of the main fibers, and the high melting point binder is melted by the processing of the heat treatment step with the next thermocompression bonding roll, and the main fibers are separated. By bonding, sufficient strength is provided.

As means for fibrillating the heat-resistant main fiber, the fibers are beaten using a general beater such as a ball mill, beater, lampen mill, Kohlergang, PFI mill, jokromill, SDR, DDR and other refiners. This is done by: In the beating process, the freeness of the heat-resistant main fiber is preferably 500 ml or less as measured by a measuring method using a Canadian standard freeness tester. However, in this measurement, 3 g of the heat-resistant main fiber and 50 ml of a 0.15% polyacrylamide solution as a synthetic adhesive were added with water to make 1 liter, and the sample was supplied to a Canadian standard freeness tester. Shall be performed. When the freeness of the beaten heat-resistant main fibers is larger than 500 ml, the entanglement between the main fibers is insufficient, and the sheet strength of the primary sheet cannot be obtained, which is not preferable because the heat-resistant paper-like material cannot be obtained. . This is clearer than the following experimental results.

The apparatus and conditions of the thermocompression bonding roll necessary for thermally melting the high melting point binder fiber constituting the primary sheet obtained by the above-mentioned wet papermaking method can melt the high melting point binder fiber such as a heat calender. A heat roll with a heating device capable of pressing to a temperature of 150 ° C. or more is applied to the present invention, and the conditions of the subsequent roll temperature, press pressure, speed, etc. are determined by the type of the high-melting binder fiber and the target Adjust according to density.

The paper-like material of the present invention may contain various additives such as a paper strength enhancer, a dispersant, an antifoaming agent, a synthetic adhesive and a pigment component used in ordinary papermaking. I can do it. The heat-resistant paper-like material of the present invention thus obtained has an excellent feature that the thickness is thin and the formation is uniform as compared with the dry method used for manufacturing a nonwoven fabric.

[0021]

Embodiments of the present invention will be described below. [Method of fibrillating heat-resistant main fiber] For fibrillation, an SDR (single disc refiner) was used as a beating machine. 10 heat-resistant main fibers as raw materials
Using 0 g, 10 liters of an aqueous solution of a raw material having a concentration of 1.0% was passed through SDR to be beaten. The disc gap is 0.
1 mm. The degree of beating differs depending on the number of passes through the SDR, and the number was determined in relation to the freeness.

[Wet Papermaking Method Used for Sample Preparation] A reciprocating rotary agitator blade was put into a bucket containing 10 liters of water and stirred, and 100% of the above fibrillated heat-resistant main fiber was placed in the bucket. Alternatively, the fibrillated heat-resistant main fiber 90% and the high melting point binder fiber 1
8 g of raw fiber weighed so as to have a mixing ratio of 0% was added, and mixed and stirred for 3 minutes to be dispersed. Thereafter, a synthetic viscosity agent (trade name: ACRYPERSE, manufactured by Diafloc) was added to the raw fiber by 11% by weight, and the mixture was further stirred for 2 minutes to prepare a raw material liquid for papermaking. A specified amount is collected from the dispersion, and is standardized using a standard handmade device specified in TAPPI.
Wet paper was created. After that, press dewatering is performed, and 130 ° C.
The wet paper web was dried using a Yankee dryer that was heated and adjusted to obtain a primary sheet having a basis weight of about 60 g / m2. Examples 17, 18, 19, 20, 21, 22
Nos. 2, 23, and 24 used a mixture of fibrillated fibers and non-fibrillated fibers as heat-resistant main fibers.

[Thermo-compression bonding] The primary sheet is heated at about 280 ° C.
Using a heat calender adjusted to a pressure of 200 kg
A thermocompression treatment was performed under the conditions of / cm to melt the high melting point binder fiber to obtain a heat-resistant paper-like material of the present invention. The following evaluation was performed on the obtained primary sheet and the heat-resistant paper-like material of the present invention. (1) Tensile strength of primary sheet: Measured at room temperature according to JIS P8113. (2) Tensile strength of heat-resistant paper: Measured in an environment heated to 180 ° C according to JIS P8113. (3) Impregnation: A piece of paper cut to a size of 25 mm × 25 mm was floated on castor oil at 30 ° C., and the time until the entire piece of paper was impregnated with castor oil was measured and used as a measure of resin impregnation.

Example 1 PBO fiber (manufactured by Toyobo Co., Ltd., trade name: Zylon, fiber length: 6 mm) was beaten as a main fiber, and its Canadian standard freeness was 300 ml, and no high melting point binder fiber was used. The heat-resistant paper-like material of the present invention was obtained by the wet papermaking method.

Example 2 The heat-resistant main fiber of Example 1 and a polyparaphenylene sulfide fiber (manufactured by Toyobo Co., Ltd., trade name: PROCON II) as a high melting point binder fiber
, A fiber length of 6 mm) in the same manner as in Example 1 to obtain a heat-resistant paper-like material of the present invention.

Example 3 The heat resistance of the present invention was the same as in Example 2 except that a wholly aromatic polyester fiber (trade name: Vectran, fiber length 5 mm) was used as the high melting point binder fiber. A paper was obtained.

Example 4 As a high melting point binder fiber, a tetrafluoroethylene-hexafluoropropylene copolymer fiber (manufactured by Toyo Polymer Co., trade name: Hastex,
A heat-resistant paper-like material of the present invention was obtained in the same manner as in Example 2 except that a fiber length of 5 mm) was used.

<Examples 5 to 16> As main fibers, phenol resin fibers (trade name: Kainol fiber KF0206, fiber length 6 mm, manufactured by Nippon Kainol), polyimide fibers (trade name: P84, fiber length 6 mm, manufactured by Toyobo Co., Ltd.), Using polytetrafluoroethylene fiber (trade name: TOYOFLON, fiber length 6 mm, manufactured by Toray Fine Chemical Co., Ltd.)
As the high melting point binder fiber, a polyparaphenylene sulfide fiber (trade name: PROCON II, manufactured by Toyobo Co., Ltd.)
Fiber length 6 mm), wholly aromatic polyester fiber (trade name: Vectran, fiber length 5 mm, manufactured by Kuraray Co., Ltd.), tetrafluoroethylene-hexafluoropropylene copolymer fiber (trade name, manufactured by Toyo Polymer Co., Ltd .: Hastex, fiber length 5
mm), the heat-resistant paper-like material of the present invention was obtained in the same manner as in Examples 1 and 2, except that the main fiber and the high-melting-point binder fiber were combined as shown in Table 3.

<Example 17> PBO fiber which has not been beaten as a heat-resistant main fiber (trade name: Zylon, fiber length 6 mm, manufactured by Toyobo Co., Ltd.) and PBO fiber which has been beaten and has a Canadian standard freeness of 300 ml Was used in a total weight ratio of the heat-resistant main fiber of 3/7, and the heat-resistant paper-like material of the present invention was obtained by the wet papermaking method without using the high melting point binder fiber.

<Example 18> A PBO fiber which has not been beaten as a heat-resistant main fiber (trade name: Zylon, fiber length 6 mm, manufactured by Toyobo Co., Ltd.) and a PBO fiber which has been beaten and has a Canadian standard freeness of 300 ml And 3/10 of the total weight ratio of the heat-resistant main fiber, and 10% of the high-melting binder fiber used in the examples with respect to the total weight of the raw material fiber, and the heat resistance of the present invention in the wet papermaking method. A paper was obtained.

<Example 19> PBO fiber which is not beaten as a heat resistant main fiber (manufactured by Toyobo Co., Ltd., trade name: Zylon, fiber length 6 mm), and PBO fiber which is beaten and has a Canadian standard freeness of 300 ml Was used in a total weight ratio of the heat-resistant main fiber of 5/5, and the heat-resistant paper-like material of the present invention was obtained by the wet papermaking method without using the high melting point binder fiber.

<Example 20> PBO fiber which is not beaten as a heat-resistant main fiber (manufactured by Toyobo Co., Ltd., trade name: Zylon, fiber length 6 mm) and PBO fiber which is beaten and has a Canadian standard freeness of 300 ml And 5/5 in the total weight ratio of the heat-resistant main fiber, and 10% of the high-melting binder fiber used in the examples with respect to the total weight of the raw material fiber, and the heat resistance of the present invention in the wet papermaking method. A paper was obtained.

<Example 21> A PBO fiber which is not beaten as a heat-resistant main fiber (trade name: Zylon, fiber length 6 mm, manufactured by Toyobo Co., Ltd.) and a PBO fiber which is beaten and has a Canadian standard freeness of 300 ml Was used in a total weight ratio of the heat-resistant main fiber of 7/3, and the heat-resistant paper-like material of the present invention was obtained by the wet papermaking method without using the high-melting binder fiber.

<Example 22> A PBO fiber which has not been beaten as a heat-resistant main fiber (trade name: Zylon, fiber length 6 mm, manufactured by Toyobo Co., Ltd.) and a PBO fiber which has been beaten and has a Canadian standard freeness of 300 ml And 7/3 in total weight ratio of the heat-resistant main fiber, and 10% of the high melting point binder fiber used in the examples with respect to the total weight of the raw material fiber, and the heat resistance of the present invention in the wet papermaking method. A paper was obtained.

<Example 23> PBO fiber which is not beaten as a heat-resistant main fiber (manufactured by Toyobo Co., Ltd., trade name: Zylon, fiber length 6 mm), and PBO fiber which is beaten and has a Canadian standard freeness of 300 ml Was used in a total weight ratio of the heat-resistant main fibers of 9/1, and the heat-resistant paper-like material of the present invention was obtained by the wet papermaking method without using the high melting point binder fibers.

<Example 24> A PBO fiber which was not beaten as a heat-resistant main fiber (trade name: Zylon, fiber length 6 mm, manufactured by Toyobo Co., Ltd.) and a PBO fiber which was beaten and had a Canadian standard freeness of 300 ml And 9% in total weight ratio of the heat-resistant main fiber, and 10% of the high-melting-point binder fiber used in the examples with respect to the total weight of the raw material fiber, and the heat-resistance of the present invention in the wet papermaking method. A paper was obtained.

<Comparative Example 1> Heat-resistant paper was manufactured in the same manner as in Example 1 except that unbeaten PBO fiber (trade name: Zylon, fiber length 6 mm, manufactured by Toyobo Co., Ltd.) was used as the heat-resistant main fiber. A product was obtained.

<Comparative Example 2> Unbeaten PBO fiber (manufactured by Toyobo Co., Ltd., product name: Zylon, fiber length 6 mm) was used as the heat-resistant main fiber, and polyparaphenylene sulfide fiber (high melting point binder fiber) was used. A heat-resistant paper was obtained in the same manner as in Example 1 except that Toyobo Co., Ltd. product name: PROCON II, fiber length 6 mm) was used.

Reference Example 1 Same as Example 1 except that PBO fiber (Toyobo Co., Ltd., trade name: Zylon, fiber length 6 mm), which is a heat-resistant main fiber and beaten to a Canadian standard freeness of 600 ml, was used. A heat-resistant paper-like material was obtained by a suitable method.

Table 1 shows the results of the tensile strength tests of the primary sheets and the heat-resistant papers obtained in Examples 1 to 16, and Table 1 shows the results.
2,17,18,19,20,21,22,23,24
Table 2 shows the results of the impregnation test, and Table 3 shows the results of Comparative Example, Reference Example and Example 1. As is clear from the results of Tables 1, 2, and 3, the primary sheet of the present invention does not cause a problem such as paper breakage during the papermaking process and has sufficient strength necessary for processing in the next step. As shown in Table 1, it was confirmed that the heat-resistant paper-like material of the present invention obtained by heat-treating this primary sheet exhibited high heat resistance. Also, the impregnating property is not impregnated when only the fiber obtained by fibrillating the heat-resistant main fiber is used. The use of a mixture of a fibrillated fiber and a non-fibrillated fiber of the heat-resistant main fiber imparts impregnation.

The melting points of the high melting point binder fibers shown in Table 1 are as follows. Polyparaphenylene sulfide ………………………………………………………………… 285 ° C Wholly aromatic polyester ……………………………………………… 280 ° C Ethylene-hexafluoropropylene copolymer 260 ° C

Examples 1, 2 and 17, 18, 19,
Table 2 shows the results of tests on 20, 21, 22, 23, and 24 for the mixing ratio of the primary sheet, the tensile strength, and the tensile strength of the heat-resistant paper-like material and the castor oil impregnation property. According to this,
Tensile strength is good, but for impregnation, when using only fibrillated fiber of heat-resistant main fiber,
It can be seen that impregnating properties are imparted when a mixture of a fibrillated fiber and a non-fibrillated fiber of a heat-resistant main fiber having no impregnating property is used.

Further, Table 3 shows the results of tensile strength tests of the primary sheet and the heat-resistant paper-like material for Comparative Examples 1 and 2, Reference Example 1 and Example 1. According to this, it is understood that the beating treatment, which has a Canadian standard freeness of 300 ml, is excellent in the results of the tensile strength test of the primary sheet and the heat-resistant paper-like material and also in the castor oil impregnation.

[0044]

[Table 1]

[0045]

[Table 2]

[0046]

[Table 3]

[0047]

The heat-resistant paper-like material obtained by the present invention can be produced by using a paper-making apparatus which is usually used for papermaking, and has a small thickness, uniform formation, and heat resistance of the heat-resistant main fiber. It does not use a high melting point binder fiber, but binds the main fibers with each other by entanglement of the beaten heat-resistant main fibers. By further strengthening the binding, a heat-resistant paper having good performance can be obtained very easily. Further, by using the high melting point binder fiber, the binder fiber is melted by the thermocompression bonding roll, and a heat-resistant paper-like material having a further improved sheet strength than the above-mentioned heat-resistant paper-like material is obtained by fusing the main fibers to each other. be able to.

Claims (10)

[Claims] 1. A heat-resistant main fiber, which is a heat-resistant polymer fiber, and a heat-resistant paper-like material mainly composed of a high-melting binder fiber, wherein the heat-resistant main fiber occupies the total weight of the paper-like material. An amount of 60 to 100% by weight, wherein the heat-resistant main fiber is fibrillated. 2. The heat-resistant paper-like material according to claim 1, wherein the melting point of the high-melting binder fiber is 150 ° C. or higher. 3. The heat-resistant main fiber which is a heat-resistant polymer fiber, wherein the amount of the fibrillated fiber in the total weight of the heat-resistant main fiber is 10 to 100% by weight, and the fibrillated fiber is used. 2. The heat-resistant paper-like material according to claim 1, wherein the amount of the fiber is from 0 to 90% by weight. 4. A primary sheet is prepared by fibrillating a heat-resistant main fiber, which is a heat-resistant polymer fiber, and then making a paper by a wet papermaking method, and then subjecting the primary sheet to a thermocompression roll. A method for producing a heat-resistant paper-like material. 5. A primary sheet is produced by mixing a main fiber obtained by fibrillating a heat-resistant main fiber, which is a heat-resistant polymer fiber, with a high-melting binder fiber by a wet papermaking method, and then forming a primary sheet. A method for producing a heat-resistant paper-like material, comprising providing a primary sheet to a thermocompression roll. 6. A primary sheet is prepared by subjecting a main fiber obtained by fibrillating a heat-resistant main fiber, which is a heat-resistant polymer fiber, to a non-fibrillated main fiber by wet papermaking. And then subjecting the primary sheet to a thermocompression bonding roll. 7. A primary sheet formed by subjecting a heat-resistant polymer fiber, which is a heat-resistant polymer fiber, to a fibrillated main fiber, a non-fibrillated main fiber, and a high-melting binder fiber by wet papermaking. And then subjecting the primary sheet to a thermocompression-bonding roll. 8. The amount of the heat-resistant main fiber occupying in the sheet is 60 to 100% by weight, and the amount of the high melting point binder fiber is 0 to 4%.
The method for producing a heat-resistant paper-like material according to claim 4, wherein the amount is 0% by weight. 9. The high melting point binder fiber having a melting point of 150
The method for producing a heat-resistant paper-like material according to claim 4, wherein the temperature is at least 0 ° C. 10. The method for producing a heat-resistant paper-like material according to claim 4, wherein the heat-resistant main fiber is fibrillated to a Canadian standard freeness of 500 ml or less.