JP2000007847A - Polyester-fiber reinforced rubber composition and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce the subject composition excellent in rigidity, strength and modulus of elasticity and further processability and lightweight properties and suitably usable as industrial products, etc., by kneading a polyester-fiber reinforced resin composition with a rubber component. SOLUTION: This composition comprises (A) 2-70 pts.wt. of a polyester-fiber reinforced resin composition comprising (i) 95-40 pts.wt. of a glycidyl acrylate-α- olefin copolymer (preferably a random copolymer of glycidyl acrylate and an α-olefin or a graft copolymer of a polyolefin and the glycidyl acrylate) and (ii) 5-60 pts.wt. of polyester fibers (preferably the ones having <=1 μm average fiber diameter) and (B) 100 pts.wt. of a rubber component (preferably the one having <=0 deg.C, preferably <=-20 deg.C glass transition temperature, e.g. natural rubber or isoprene rubber). Thereby, the resultant composition is excellent in molding processability and lightweight properties, readily handleable in the form of pellets and good in dispersibility in rubber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber reinforced rubber composition comprising a glycidyl acrylate / .alpha.-olefin copolymer reinforced with a polyester fiber and a rubber component kneaded with the resin composition. Because of its excellent properties and lightness, it can be suitably used for industrial products.

[0002]

2. Description of the Related Art Polyolefin resins are light and easy to mold, and have a certain degree of mechanical strength, so that they are used for a wide range of applications. However, when strength and elastic modulus are required, they are reinforced with glass fiber, so workability and lightness may be impaired, and the appearance of molded products may be deteriorated. Had been.

JP-B-58-47419, JP-B-6-47419
JP-A-3-33487 discloses that a composition comprising a polyester and an α-olefin / glycidyl acrylate copolymer is excellent in impact resistance, heat resistance and mechanical strength. However, in these methods, the polyester is not fibrous. JP-A-5-163618 discloses a core-sheath fiber having excellent rubber adhesiveness when an ionomer is used as an innermost layer and a polyamide is used as an outermost layer in a polyester for a tire cord. Since these fibers are continuous fibers, they are difficult to disperse in rubber.

[0004] JP-A-7-238189, JP-A-9-238189
JP-A-59431 discloses a composition in which a polyolefin and a rubber component are used as a matrix and polyamide fibers are dispersed in the matrix, and it is described that blending with a rubber improves mechanical strength. However, polyamide fibers may be cut by kneading shearing force during processing, which is not always satisfactory and requires further improvement.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a polyester fiber reinforced rubber composition which solves the above-mentioned problems and provides a product excellent in rigidity, strength, lightness and the like.

[0006]

According to the present invention, the polyester fiber reinforced rubber composition comprises the following (A) and (B): (A) polyester fiber reinforced resin composition 2
(B) 100 parts by weight of a rubber component. And (A) polyester fiber reinforced resin composition is the following (a) glycidyl acrylate · α
-95 to 40 parts by weight of the olefin copolymer and (b) 5 to 60 parts by weight of the polyester fiber.
Further, (a) the glycidyl acrylate / α-olefin copolymer is a random copolymer of glycidyl acrylate and α-olefin or a graft copolymer of polyolefin and glycidyl acrylate, and (b) the average fiber diameter of the polyester fiber is It is 1 μm or less. Then, the method for producing the polyester fiber reinforced rubber composition is such that the glycidyl acrylate / α-olefin copolymer (a) and the polyester (b) are melted and kneaded, and extruded.
(A) The glycidyl acrylate-α-olefin copolymer is obtained by drawing and drawing or rolling at a temperature not lower than the melting point of the glycidyl acrylate / α-olefin copolymer and not higher than the melting point of the polyester as the component (b). Polyester fiber (b) in polymer is 1 μm in average fiber diameter
It is provided by kneading (B) a rubber component with (A) a polyester fiber reinforced resin composition obtained by dispersing into the following fibrous form.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The polyester fiber reinforced rubber composition of the present invention and the constituent components in the method for producing the same will be specifically described below. The component (a) is a glycidyl acrylate graft copolymer of polyolefin (polyolefin resin) or a random copolymer of glycidyl acrylate / α-olefin, and a glycidyl acrylate graft copolymer of polyolefin having a melting point in the range of 80 to 250 ° C. And a random copolymer of glycidyl acrylate and α-olefin are preferred. Examples of such suitable polyolefins include homopolymers or copolymers of olefins having 2 to 8 carbon atoms, copolymers of olefins having 2 to 8 carbon atoms and vinyl acetate, and copolymers of 2 to 8 carbon atoms. Copolymer of olefin and acrylic acid or its ester, having 2 to 2 carbon atoms
A copolymer of an olefin of 8 and methacrylic acid or an ester thereof, and a copolymer of an olefin of 2 to 8 carbon atoms and a vinylsilane compound are preferably used.

Specific examples of polyolefins include high-density polyethylene, low-density polyethylene, linear low-density polyethylene, polypropylene, ethylene-propylene block copolymer, ethylene-propylene random copolymer,
Poly-4-methylpentene-1, polybutene-1, polyhexene-1, ethylene / vinyl acetate copolymer, ethylene / vinyl alcohol copolymer, ethylene / acrylic acid copolymer, ethylene / methyl acrylate copolymer, ethylene・ Ethyl acrylate copolymer, ethylene / propyl acrylate copolymer, ethylene / butyl acrylate copolymer, ethylene / 2-ethylhexyl acrylate copolymer, ethylene / hydroxyethyl acrylate copolymer,
An ethylene / vinyltrimethoxysilane copolymer, an ethylene / vinyltriethoxysilane copolymer, an ethylene / vinylsilane copolymer, or the like is used.

Among these polyolefins, preferred are high density polyethylene, low density polyethylene, linear low density polyethylene, polypropylene, ethylene / propylene block copolymer, ethylene / propylene random copolymer, ethylene / vinyl acetate. Copolymer and ethylene / ethyl acrylate copolymer, among which the melt flow index (MFI) is 0.2 to 5
Those having a range of 0 g / 10 minutes are the most preferable. These may be used alone or in combination of two or more.

[0010] Particularly preferred as the polyolefin of the component (a) are high-density polyethylene (HDPE),
Low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), polypropylene (PP), ethylene-propylene block copolymer (EPBC), ethylene-propylene random copolymer (EPRC), ethylene-vinyl acetate copolymer Glycidyl acrylate graft copolymer, glycidyl methacrylate graft copolymer, glycidyl acrylate / α-olefin random copolymer, glycidyl methacrylate / α-olefin of EVA and ethylene / ethyl acrylate copolymer (EEA) A random copolymer is mentioned. Its melt flow index (MFI) is 0.2 to 50 g
A range of / 10 minutes is most preferable, and these may be used alone or in combination of two or more. The α-olefin in the glycidyl acrylate / α-olefin random copolymer and the glycidyl methacrylate / α-olefin random copolymer include ethylene, propylene, and butene-1, and ethylene is preferably used.

The glycidyl acrylate graft copolymer or glycidyl methacrylate graft copolymer of the component (a) may be prepared by melting the above-mentioned polyolefin with glycidyl acrylate or glycidyl methacrylate under normal pressure, in a solvent or in the presence of an organic peroxide. It is obtained by reacting below. The reaction with the polyolefin is promoted by using the organic peroxide together. The amount of the organic peroxide to be used is 0.1 to 100 parts by weight of the polyolefin of the component (a).
01 to 1.0 part by weight. If the amount is too small, the reaction is not sufficient, so that the bond with the polyester of the component (b) is reduced. As the organic peroxide, the half-life temperature for one minute is the same as the higher of the melting point of the component (a) or the melting point of the component (c), or 30% below this temperature.
Those having a temperature range as high as about ° C are preferably used. Specifically, those having a half-life temperature of about 110 to 260 ° C. for one minute are preferably used.

Specific examples of the organic peroxide include di-α-cumyl peroxide, 1,1-di-tert-butylperoxy-3,3,5-trimethylcyclohexane, 1,1-
Di-t-butylperoxycyclohexane, 2,2-di-t-butylperoxybutane, n-butyl 4,4-di-t-butylperoxyvalerinate, 2,2-bis (4,4-di -T-butylperoxycyclohexane)
Propane, 2,2,4-trimethylpentylperoxyneodecanate, α-cumylperoxyneodecanate, t-butylperoxyneohexanate, t-butylperoxypivalate, t-butylperoxyacetate, t-butyl peroxy laurate, t-butyl peroxy benzoate, t-butyl peroxy isophthalate and the like. Above all, the one-minute half-life temperature is in the range of the melt-kneading temperature or a temperature about 30 ° C. higher than this temperature, specifically, the one-minute half-life temperature is 80 to 260.
C. is used preferably.

The ratio of glycidyl acrylate to polyolefin in component (a) is 0.05 to 1.0% by weight.
It is. Preferably it is 0.02 to 0.5% by weight.
If the amount is less than 0.05% by weight, the reactivity between the polyester (b) and the glycidyl acrylate is reduced, so that the polyester cannot be bonded. If the content exceeds 1.0% by weight, the reactivity between the polyester (b) component and glycidyl acrylate increases and the fiber does not become fibrous, so that the polyester fiber reinforced material is not obtained. In the case of a glycidyl acrylate / ethylene copolymer, it is used after being appropriately diluted with another polyolefin within a necessary range. The component (a) has an MFI of 0.2 to 100 g / 1.
Most preferably in the range of 0 minutes, preferably 1 to 50 g / 10 minutes.

The component (b) is a thermoplastic polyester having a melting point of 135 to 300 ° C.
It is higher than the melting point of the component by 20 ° C. or more, particularly preferably in the range of 160 to 280 ° C. As such a component (b), polyester (hereinafter, referred to as polyester) which gives a tough fiber by extrusion and drawing is preferred. Polyesters include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, diphenylethane-4,4-carboxylic acid, aliphatic dicarboxylic acids such as sebacic acid and adipic acid, and derivatives thereof, and ethylene glycol and butylene glycol. , Hexanediol, cyclohexanediol, cyclohexanedimethanol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, bisphenol A, bisphenol F, and other polymers obtained by a polycondensation reaction with a compound having two hydroxyl groups. These dicarboxylic acids and diols may be used alone or in combination of two or more. Specific examples of polyester include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycyclohexane dimethylene terephthalate, and copolymers thereof. Of these, polyethylene terephthalate and polybutylene terephthalate are preferred. As a standard of these molecular weights, the intrinsic viscosity (intrinsic viscosity) obtained at 30 ° C. with a mixed solvent of phenol / tetrachloroethane = 50/50 (weight ratio) is in the range of 0.5 to 1.68 (dl / g). Are preferred. If the limiting viscosity number is less than this range, the fiber strength is too weak, and if it exceeds this range, no fiber is formed, which is not preferable.

The polyester of component (b) is uniformly dispersed in component (a), and has an average fiber diameter of 1 μm or less for 70% or more, preferably 80%, particularly preferably 90% or more. The average fiber length is 1,000 μm or less. The aspect ratio (ratio of average fiber length / average fiber diameter) is 20 or more and 10,000 or less.
The component (a) and the component (b) are bonded to each other at the interface.
Further, the polyester fiber reinforced resin composition (A) comprising the components (a) and (b) is 95 to 40 parts by weight based on 100 parts by weight of the total of the components (a) and (b). Part, component (b) is 5 to 60 parts by weight. Preferably, component (a) is 90 to 50 parts by weight, and component (b) is 10 to 5 parts by weight.
0 parts by weight. If the amount of the component (b) is less than 5 parts by weight, the effect of improving the elastic modulus and strength is not exhibited. If the amount is more than 60 parts by weight, fibers cannot be formed, or the dispersion of the fibers becomes poor, and the surface gloss of the molded article is impaired. Or

The component (B) is rubber and has a glass transition temperature of 0 ° C. or lower, preferably -20 ° C. or lower. Specifically, natural rubber, isoprene rubber, butadiene rubber,
Vinyl cis butadiene rubber, styrene butadiene rubber, acrylonitrile butadiene rubber, butyl rubber,
Chlorinated butyl rubber, chloroprene rubber, acrylonitrile / chloroprene rubber, acrylonitrile / isoprene rubber, acrylate / butadiene rubber, pyridine / styrene / butadiene rubber, styrene / isoprene rubber, carboxylated styrene / butadiene rubber, carboxylated acrylonitrile / butadiene rubber, ethylene / ethylene rubber Thermoplastic elastomers such as diene rubber such as propylene / diene rubber, syndiotactic-1,2-polybutadiene, styrene / butadiene / styrene / block copolymer, styrene / isoprene / styrene / block copolymer, ethylene / propylene rubber , Chlorinated polyethylene, chlorsulfonated polyethylene, polyolefin-based rubber such as ethylene vinyl acetate, acrylic rubber, ethylene acetate Rirugomu, monochloride trifluoride polyethylene, fluororubber, rubber having a polymethylene type backbone such as hydrogenated acrylonitrile-butadiene rubber, epichlorohydrin rubber. Rubbers containing oxygen in the main chain such as ethylene oxide, epihydrhydrin, allyl glycidyl ether rubber, silicone rubbers such as polydimethylsiloxane, polymethylethylsiloxane, and polyphenylmethylsiloxane, nitroso rubber, polyester urethane, polyether urethane, etc. Rubbers having nitrogen and oxygen atoms in addition to carbon atoms in the chain can be mentioned.

The ratio of the polyester fiber reinforced resin composition of the component (A) to the rubber of the component (B) is as follows.
The component (B) is 100 parts by weight based on parts by weight. It is preferably 4 to 55 parts by weight. If the amount of the component (A) is less than 2 parts by weight, the dispersibility of the component (b) in the component (A) becomes poor, and the reinforcing effect is not exhibited. If the amount of the component (A) exceeds 70 parts by weight, the composition becomes too rigid, and the creep properties of the vulcanizate deteriorate.

Most of the component (b) is uniformly dispersed as fine fibers in the matrix of the component (a). Specifically, 70% by weight, preferably 80% by weight, particularly preferably 90% by weight or more is dispersed as fine fibers. The fiber of the component (b) has an average fiber diameter of 1 μm.
m and an average fiber length of 100 μm or less. The aspect ratio (ratio of fiber length / fiber diameter) is 20 or more and preferably 10,000 or less. And
The component (a) is bonded to the component (b) at the interface.

Next, a method for producing the polyester fiber reinforced resin composition and the polyester fiber reinforced rubber composition of the present invention will be described. It is manufactured from the following steps. (1) A step of melting and kneading the polyolefin resin of the component (a) and glycidyl acrylate or glycidyl methacrylate to chemically modify, or a step of simply kneading a glycidyl acrylate / α-olefin random copolymer (hereinafter referred to as a chemical modification step) ), (2) The melt-kneaded product of component (a) is melt-kneaded at a temperature equal to or higher than the melting point of polyester of component (b), and extruded from a nozzle at a temperature equal to or lower than the melting point of polyester of component (b). Step (hereinafter referred to as extrusion step), (3) Step of drawing or rolling by taking a draft at a temperature lower than the melting point of component (b) (hereinafter referred to as drawing or rolling step), (4) Composition drawn or rolled Is cooled to room temperature and pelletized [Polyester fiber reinforced resin composition (A) is obtained] (hereinafter, pelletizing step) and (5) are obtained. Let the component (B) rubber was added to the (a) step of melt-kneading at a temperature above the melting point of the component (hereinafter, the rubber compounding process) is manufactured by.

The steps will be described below. (1) chemical modification step: polyolefin of component (a),
The step of melt-kneading glycidyl acrylate or glycidyl methacrylate and an organic peroxide for graft copolymerization will be described. The melt-kneading temperature is equal to or higher than the melting point of the polyolefin resin of the component (a). 30 ° C from melting point
High temperature. When melt-kneaded at a temperature 30 ° C. higher than the melting point, glycidyl acrylate or glycidyl methacrylate is melt-kneaded and undergoes graft copolymerization. A glycidyl acrylate / α-olefin random copolymer is merely kneaded. Melt kneading can be performed by an apparatus usually used for kneading resin or rubber. Such devices include Banbury mixers, kneaders, kneader extruders, open rolls, single-shaft kneaders,
A twin-screw kneader or the like is used. Among these apparatuses, a twin-screw kneader is most preferable because the melt-kneading can be performed in a short time and continuously (the same applies to the following steps).

(2) Extrusion step: The polyester of the component (b) is added to the component (a) of the chemically modified product in the above step,
The step of melt-kneading at a temperature higher than the melting point of the component (b) and extruding will be described. The melt-kneading temperature is equal to or higher than the melting point of the component (b). If the melt-kneading temperature is lower than the melting point of the component (b), kneading cannot be carried out and the fiber does not disperse. Therefore, it is melt-kneaded at a temperature higher than the melting point, particularly preferably at a temperature higher by 10 ° C. Extrude.

(3) Stretching or rolling step: The step of stretching or rolling the extrudate in the above step will be described. The kneaded product extruded from the spinneret, the inflation die or the T die is drawn or rolled while drafting at a temperature lower than the melting point of the polyester (b). Specifically, a temperature lower than the melting point of the component (b),
It is preferable to carry out in a temperature range lower by ° C. Even if melting and kneading are performed at a temperature higher than the melting point of component (b) in this step, the kneaded material does not have a structure in which fine particles of component (b) are dispersed in a matrix composed of component (a).
Therefore, even if the kneaded product is spun and drawn, the component (b) cannot be turned into fine fibers. In the stretching or rolling, for example, the kneaded material is extruded from a spinneret, spun into a string or a thread, and wound around a hobbin while being drafted.
Alternatively, it can be carried out by a method such as cutting into pellets. Here, "drafting" means that the winding speed is set higher than the spinneret speed. The ratio (draft ratio) of the winding speed / the spinneret speed is preferably in the range of 1.5 to 100, more preferably in the range of 2 to 50, and particularly preferably 3 to 30.

(4) Pelletizing step: A step of pelletizing the stretched or rolled product obtained in the above step. What is necessary is just to pelletize by the method normally performed. By doing so, the polyester fiber reinforced resin composition of the component (A) is obtained. Since it is in the form of pellets, it is easy to obtain a composition which is easily kneaded with rubber or resin and is uniformly dispersed.

(5) Rubber kneading step: The polyester fiber reinforced resin composition of component (A) obtained above is added to (B)
Add the rubber component. The rubber component is added and kneaded at a temperature lower than the melting point of the polyester (A) and at a temperature higher than the melting point of the component (a). This is because the polyester fibers must not be melted. The polyester fiber reinforced tree composition is uniformly dispersed in the rubber component to obtain a polyester fiber reinforced rubber composition.

As described above, each step has been described separately, but the first supply port, the second supply port, and the third supply port capable of supplying the component (a), the organic peroxide, the component (b), and the like. , And a first kneading zone, a second kneading zone corresponding to each supply port,
It is also possible to use a twin-screw kneader having a third kneading zone and carry out batch processing in a continuous process. Doing so results in an economical, stable, and safe manufacturing method.

The polyester fiber reinforced resin composition and the polyester fiber reinforced rubber composition of the component (A) of the present invention further include carbon black, white carbon, activated calcium carbonate, ultrafine magnesium silicate, high styrene resin, and phenol resin. , Lignin, modified melamine resin, coumarone indene resin, petroleum resin, etc.
Various fillers such as calcium carbonate, basic magnesium carbonate, clay, mica, zinc white, montmorillonite, wollastonite, amine / aldehydes, amine / ketones, amines, phenols, imidazoles, sulfur-containing oxidation It may contain an antioxidant, a stabilizer such as a phosphorus-containing antioxidant, and various pigments.

[0027]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to the scope of these Examples. In Examples and Comparative Examples, the physical properties of the polyester fiber reinforced resin composition and the polyester fiber reinforced rubber composition were measured as follows. Fiber shape : average fiber diameter : after dissolving the resin composition in xylene, removing the fiber component, washing, observing with a scanning electron microscope, and dispersing good when fine fibers are dispersed,
When the fibers were aggregated in the form of fine fibers or a film, the dispersion was evaluated as poor dispersion. If the dispersibility is good, dispersed fine fibers 200
With respect to the book, the fiber diameter was measured with the above-mentioned scanning electron microscope, and the average was determined to be the average fiber diameter. Tensile strength, tensile elastic modulus, elongation : For polyester fiber reinforced resin composition, temperature 2 according to JIS K6760
Tensile strength, tensile modulus and elongation were determined at 3 ° C. and a tensile speed of 50 mm / min. For the vulcanized product of the polyester fiber reinforced rubber composition, 100% stress, 300% stress, tensile strength and elongation were determined at a temperature of 23 ° C. and a tensile speed of 500 mm / min according to JIS K6251.

Reference Example 1 High-density polyethylene (HDP
E, manufactured by Keiyo Polyethylene Co., Ltd., M3800, melting point 130
C., MFI = 8.0 g / 10 min), 100 parts by weight, 1 part by weight of glycidyl methacrylate (manufactured by Wako Chemical Co., Ltd.), and 0.2 parts by weight of di-α-cumyl peroxide (concentration: 40% by weight) as an organic peroxide. The mixture was charged into a Banbury mixer (1.7 liter) at a temperature of 170 ° C., mixed for 5 minutes and dumped to obtain a glycidyl methacrylate graft polyethylene of the component (a). Melting point was 125 ° C.

Example 1 80 parts by weight of the glycidyl methacrylate-grafted polyethylene produced in Reference Example 1 as the component (a), and polyethylene terephthalate (PET, manufactured by Mitsui Chemicals, Mitsui PET, J15) as the component (b)
5, intrinsic viscosity number 1.0 dl / g) and 20 parts by weight
Into a 45φ twin screw extruder heated to 2.5 ° C
The mixture was kneaded, extruded into a stranded strand, cooled with air, taken up with a take-up roll at a draft ratio of 10 and stretched 1.5 times at room temperature between 5 inch rolls to form a pellet. The pellet was 3 mm long and 0.5 mm in diameter. The mechanical properties of a test piece obtained by pressing the pellet at 190 ° C. on the polyester fiber reinforced resin composition obtained by kneading the pellet with a Brabender plastograph heated at 190 ° C. for 5 minutes were measured. The test piece was dissolved in hot xylene to extract the component (a). Observation of the obtained extracted insoluble matter with a scanning electron microscope revealed that the extract was in the form of a fiber having an average diameter of 0.2 μm. The results are shown in Table 1.

Examples 2 and 4 The results are shown in Table 1 in the same manner as in Example 1 with the composition shown in Table 1.

Example 3 In the composition shown in Table 1, glycidyl methacrylate / ethylene copolymer (manufactured by Sumitomo Chemical Co., Ltd., Bondfast 2C, melting point 105 ° C., M
FI = 8.0 g / 10 min, glycidyl methacrylate content = 6% by weight) 0.1 part by weight and high-density polyethylene (HDPE, manufactured by Keiyo Polyethylene Corporation, M3800, M
FI = 8.0 g / 10 min) 59.9 parts by weight, (b)
As a component, 40 parts by weight of polyethylene terephthalate (PET, manufactured by Mitsui Chemicals, Inc., Mitsui PET J155, melting point 260 ° C., intrinsic viscosity 1.0 dl / g) is blended at 280 ° C.
And the same procedure as in Example 1 was carried out. The results are shown in Table 1.

[Comparative Examples 1 and 2] The same procedures as in Example 1 were carried out except that, in the composition shown in Table 1, Reference Example 1 was used as the component (a) and the above PET was used as the component (b). The results are shown in Table 1.

[Comparative Example 3] The above-mentioned HDPE with the composition shown in Table 1
Was used in the same manner as in Example 1 except that 50 parts by weight of the above PET and 50 parts by weight of the above PET were used. The results are shown in Table 1.

[Table 1]

Examples 5 to 8 The polyester fiber reinforced resin compositions obtained in Examples 4, 2 and 3 and a rubber component (N
R, SBR and BR) at 150 ° C. according to Tables 2 and 3.
And vulcanized at 145 ° C. as a compound of the polyester fiber reinforced rubber composition, and the mechanical properties were measured. The results are shown in Table 3.

Comparative Example 4 100 parts by weight of the polyester fiber reinforced resin composition of Example 4 and NR10 of the component (B) were used.
0 parts by weight were blended, blended at 150 ° C. and vulcanized at 145 ° C. as in Example 5. The results are shown in Table 3.

[Comparative Examples 5 to 7] Tables 2 and 3 except that the polyester fiber reinforced resin composition of Example was not blended.
NR, SBR and BR were blended in the same manner as in Example 5, and vulcanized. The results are shown in Table 3.

[0037]

[Table 2]

[0038]

[Table 3]

[0039]

According to the polyester fiber reinforced resin composition of the present invention, the polyester fibers are uniformly dispersed to an average fiber diameter of 1 μm or less, and the glycidyl acrylate / α-olefin copolymer and the polyester fibers are bonded at the interface. . As a result, it is possible to provide a polyester fiber reinforced rubber composition which is excellent in moldability and lightness, is easy to handle with pellets, has good dispersibility in rubber, and has good strength and elastic modulus.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08L 63/00 C08L 63/00 A 67/02 67/02 (72) Inventor Yukihiko Asano Ichihara, Chiba Goi south coast 8th-1 Ube Industries, Ltd. Polymer Research Laboratory F term (reference) 4F072 AB05 AB15 AB34 AD02 AD04 AD09 AD37 AD52 AK16 AK20 4J002 AC011 AC031 AC061 AC071 AC081 AC091 BB072 BB151 BB181 BB241 BC041 BD121 CF043 BN03 CF083 CH041 CK031 CK041 CP031 FA043

Claims (5)

[Claims] 1. A polyester fiber reinforced resin composition comprising the following components (a) and (b): (a) 95 to 40 parts by weight of a glycidyl acrylate / α-olefin copolymer and (b) 5 to 60 parts by weight of a polyester fiber. It is characterized by becoming. 2. A polyester fiber reinforced rubber composition comprising the following components (A) and (B): (A) 2 to 70 parts by weight of a polyester fiber reinforced resin composition and (a) glycidyl acrylate / α-olefin copolymer 95 to 40 parts by weight and (b) polyester fiber 5
(B) 100 parts by weight of a rubber component. 3. The polyester fiber reinforced according to claim 1, wherein (a) the glycidyl acrylate / α-olefin copolymer is a random copolymer of glycidyl acrylate / α-olefin or a graft copolymer of polyolefin and glycidyl acrylate. Resin composition. 4. The polyester fiber (b) having an average fiber diameter of 1
The polyester fiber reinforced resin composition according to claim 1, which is not more than μm. 5. A method of melting (a) a glycidyl acrylate / α-olefin copolymer and (b) a polyester,
Kneaded and extruded, (a) glycidyl acrylate α
-At a temperature not lower than the melting point of the olefin copolymer and not higher than the melting point of the polyester of the component (b), by drawing and drawing or rolling, (a) the glycidyl acrylate / α-olefin copolymer contains (b) The method for producing a polyester fiber reinforced rubber composition according to claim 2, wherein the (B) rubber component is kneaded with the (A) polyester fiber reinforced resin composition obtained by dispersing polyester fibers into a fiber having an average fiber diameter of 1 µm or less.