JPH02175729A - Fiber-reinforced resin composition - Google Patents

Abstract

PURPOSE:To obtain a fiber-reinforced resin composition excellent in rigidity, strengths and fatigue resistance by finely dispersing chopped strands comprising a glass fiber and chopped strands of a highly elastic inorganic fiber in a resin component. CONSTITUTION:A fiber-reinforced resin composition comprising a resin component and chopped strands dispersed therein is prepared in such a way that said chopped strands consist of chopped glass strands formed by binding a glass fiber and chopping the bound glass fiber and highly elastic chopped strands formed by binding a highly elastic inorganic fiber having an elasticity higher than that of the glass fiber and the number of bound fibers <=3000 and chopping the bound inorganic fibers. When compared with a conventional hybrid SMC composed of nonuniformly dispersed glass fiber strands and thick, highly elastic inorganic tiber strands, the hybrid SMC composed of finely dispersed glass giber strands and thin, highly elastic inorganic fiber strands has a high rigidity and is markedly improved in strengths and durability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a sea-reinforced resin composition having excellent rigidity, strength, and fatigue durability, and in particular, the present invention relates to a sea-reinforced resin composition having excellent rigidity, strength, and fatigue durability. The fiber-reinforced resin composition finely dispersed in the ingredients contains l! I do it.

[Conventional technology 1 Single glass fiber! A predetermined number of navy blue pieces (usually 200 to 4 pieces)
00 pieces) bundled glass fiber strands to a predetermined length (
G
- SMC is generally called C-8M0, and SMC using non-ITL fibers having a higher modulus than glass fibers, such as carbon fibers, is generally called C-8M0.

Among these, G-SMC, which is made from glass fiber, is sheet-like, non-adhesive, easy to handle, and has high productivity.SM
Since C is solid, it is easy to cut and measure, and molding can be automated. (ii) During molding, there is little viscosity drop in the mold, and the glass reinforcement material is spread evenly even in a compound shape, resulting in a molded product with irregular physical properties, and changes in thickness.
It is also possible to form ribs, bosses, etc. It also has various characteristics such as excellent surface gloss and little protrusion of glass fibers.

In addition, C-8MG has excellent high strength for use as a structural material.

Highly elastic carbon fiber is used. ("Carbon Fiber" (Ohmsha) P13-P15 (published February 20, 1980); [Reinforced Plastics Handbook] (
Daily]: Industry Newspaper) P90-P92, Pl 05-P1
17 (published on May 15, 1975) Furthermore, in recent years, chopped carbon fiber strands have been blended with chopped glass fiber strands, and conversely, chopped strands of glass fiber have been blended with chopped carbon fiber strands. It has been proposed to improve the conventional G-8MC% C-8MC by blending strands. A composition in which different types of fibers are blended and hybridized is generally called a hybrid SMC.

[Problems to be Solved by the Invention] However, although the conventional hybrid SMC can increase the stiffness, the number of bundled high-modulus fiber strands used is very large, so the resulting hybrid SMC
There was a problem in that the internal structure of MC was extremely negative, and stress was therefore concentrated around the highly elastic strands, so that no significant improvement could be made in terms of strength and fatigue durability.

The present invention provides stiffness compared to conventional hybrid SMCs,
The purpose of this invention is to provide a 13M reinforced resin composition that has excellent strength and fatigue durability.

[Means for Solving the Problems 1] The fiber-reinforced resin composition of the present invention comprises a resin component and chopped strands dispersed in the resin component. The strand is
Glass fiber chopped strands are made by bundling and cutting glass fibers, and highly elastic inorganic fibers, which have a higher elastic modulus than the glass fibers and have a number of fiber bundles of 3000 or less, which is much smaller than conventional fibers, are bundled together. It is characterized by consisting of elastic chopped strands. This allows both strands to be evenly distributed, making it possible to achieve a uniform distribution of both strands, making it possible to
MC'c has a structure that makes it difficult for stress concentration to occur around the generated high elasticity fiber strands.

Here, the chopped strand is a strand that has been cut. In the present invention, two types of strands are cut at the same time. That is, a glass fiber chopped strand obtained by cutting a glass fiber strand and a high elastic chopped strand obtained by cutting an inorganic fiber strand having a fiber bundle number of 3000 or less are used as the high elastic inorganic fiber.

The number of fiber bundles of this highly elastic inorganic fiber strand is 3000.
By making it less than this, the cross-sectional area of the strand becomes small, and when the filling 111EI of the strands to be filled is constant, the number of strands per unit volume increases compared to the conventional product. Therefore, the strands are finely dispersed in the resin composition, and the properties such as rigidity and strength of the resin composition are improved.

As mentioned above, there is a certain relationship between the number of fiber bundles and the cross-sectional area of the strand, and in the case of the carbon fibers used in this example, there is a relationship as shown in Table 1.

Table 1 To be more specific, it is thought that the following structure is developed by finely dispersing the above strands in the resin composition.

(I) The length of the high elastic inorganic fiber strands near the surface of the molded plate increases. (Seventh Example No. 10.11
(See figure) This is because as the number of strands increases, the probability that highly elastic inorganic fibers will be arranged near the surface of the molded plate increases.

SMC molded plates are generally used as members that receive bending loads, and when strands with a high elastic modulus are placed near the surface of the molded plate as in the present invention, the stress is shared by these strands, resulting in Improves the rigidity and strength of the molded plate. In particular, when the proportion of high elastic inorganic fiber strands in the amount of pre-fibers exceeds 30% by volume, the effect of the present invention decreases;
This is considered to be because when the proportion of fiber strands was 30% by volume or more, the high elasticity inorganic fiber strands disposed near the surface of the molded plate became more closed, and the difference from the present invention disappeared.

For example, the number of bundled high elastic inorganic fiber strands is 200.
If the carbon fiber strand of this example has a cross-sectional area of 0.01 mm2 or less, the conventional product (the number of strands per bundle is 1 mm2 or less).
200 fibers with a cross-sectional area of 0.5 mm2), the number of strands is 60 times greater, and the number of elastic non-#R fiber strands arranged on the surface of the molded plate also increases, but if the number of strands increases too much, In the assembled state of the strands before being impregnated with resin, the bulk density becomes very high, which makes it easy to cause poor resin impregnation, which becomes a defect and causes a reduction in the strength of the molded plate.

(IF) Highly elastic inorganic fiber strands intersect (
bridging).

′! 1' That is, in the present invention, since the number of strands increases, the ratio of overlapping and intersecting high modulus inorganic fiber strands increases.

In conventional products, since the number of highly elastic inorganic fiber strands is small, there is a high probability that the strands will not intersect and will be dispersed. When a single strand is dispersed, stress is concentrated around it, and as a result, cracks tend to occur around the strand, resulting in a decrease in strength. Therefore, in order to avoid stress concentration, it is effective to intersect the strands to disperse the stress. In the present invention, compared to the above conventional product,
For example, when the cross-sectional area of the strands is 0.05 mm, the number of strands is 12 times greater, and when the cross-sectional area is 0.01 mm2, the number of strands increases by 60 times, which dramatically increases the number of strand intersections, and as a result, the stress is uniform. This improves strength.

However, if the cross section is 0.01 mm2 or more, poor impregnation is likely to occur, and even if the number of intersections increases, there will still be poor impregnation! The strength gradually decreases.

(III) Although the cross-sectional area of the highly elastic inorganic fiber strands becomes smaller, the number of them increases, so the total surface area of the side surfaces of the strands increases.

For example, assuming that a conventional strand with a cross-sectional area of 0.6 mm2 is a cylinder, the diameter is 0.874 mm, and the area of the side is 2.74 mm, taking the length of the strand as the base.
It becomes 51mm2. On the other hand, the cross-sectional area in the present invention is 0.
For a strand of 0.05 mm2, its diameter is 0.2523
mm, and the area of the strand-wood side is 0.79
It becomes 21mm2. However, since the number is 12 times as large,
The total sum of 1ii products is 9.510 mm2, which is 3.5 times that of the conventional product. Therefore, the stress transmission efficiency to the strands is greatly increased, which is considered to be the reason for the increased strength and rigidity of the present invention.

(IV) The fracture mechanism changes. <Seventh Example No. 12.
(See photo in Figure 13) In SMC that is a hybrid of high-modulus inorganic fiber strands and glass fiber strands, the elastic modulus of the high-modulus non-WAI fibers and the glass fibers are greatly different, so when a load is applied to the molded plate, the high-modulus inorganic fiber strands and glass fiber
Since a large shearing force is generated at the land boundary, a crack is generated there, and the crack propagates along the boundary. In the conventional product, because the cross-sectional area of the strands was large, cracks rapidly propagated in a straight line, leading to breakage of the molded plate.

In the present invention, since the cross-sectional area of the strands is small, even if cracks occur, their size is small, and because the strands are finely dispersed, cracks do not propagate linearly, but in large numbers. It progresses gradually while branching out. Therefore, the strength of the product of the present invention is high and the fatigue properties are significantly improved.

Moreover, it is preferable that the blending ratio of the above-mentioned total amount of fibers is within the range of 30 to 50 volume % when the entire resin composition is 100 volume %. If the blending ratio is less than 30% by volume, the absolute value of strength will be low, making it unsuitable as an industrial material. Moreover, if it exceeds 50 volume %, poor impregnation of the resin will increase and the strength will decrease.

The length of the above chopped strand is 177
A range of 4 to 2 inches is preferred. (More preferably within the range of 1/2 to 3/2 inches. )1
If it is less than /2 inch, the absolute value of strength will be low and it will be unsuitable as an industrial material. Also, if it exceeds 3/2 inch,
The linearity of the strands is lost and resin impregnation occurs, resulting in a decrease in strength. Furthermore, it is preferable to avoid dispersing them randomly in a plane in the resin composition. Further, the blending ratio of the high elastic inorganic fibers in all the 11 fibers is preferably within the range of 2 to 30% by volume. If the blending ratio is less than 2% by volume, the absolute value of the amount of high modulus inorganic fibers will be very small, and the hybrid effect will decrease. Further, even if the content exceeds 30% by volume, the hybrid effect will decrease.

The cross-sectional area of this highly elastic inorganic mN strand is 0°01~
It is preferable to set it within the range of 0.15 mm2.

If the cross-sectional area is less than 0.01 mm2, the strands will be finely dispersed, resulting in too high a strand density, resulting in poor body fat impregnation, which will lead to defects and a decrease in rigidity and strength. Moreover, if it exceeds 0.15 mm', the rigidity and strength will decrease. As the resin component to be impregnated into the glass fiber chopped smearland and the highly elastic chopped strand, it is preferable to use a thermosetting resin such as an unsaturated polyester, an epoxy, or a vinyl ester.

[Example] As a method for manufacturing the resin composition of the present invention, conventional general methods can be used. For example, when manufacturing a hybrid SMC, there are the following methods.

As shown in FIG. 1, a glass fiber strand 2 is fed out from a roving 1 in which glass fibers 1 to 2 are wound together. At the same time, the carbon fiber strands 24 in which carbon In from the rovings 4 arranged in parallel with the rovings 1 in the axial direction are drawn out.

The glass fiber strand 2 is fed m to the chopper 5 via guide rollers 3.4. On the other hand, carbon fiber strand 24
are guided to the chopper 54 adjacent to the chopper 5 by guide rollers 34, 44 provided coaxially (not shown) with the guide rollers 3, 4 described above. Each strand 2a.

24a are each cut into approximately 1 inch lengths using a chopper 5.54, and the fibers are allowed to fall while still being bundled. Fallen chopped glass fiber strand 2a
The chopped carbon fiber strands 24a are deposited on the plastic sheet 7a fed from the first sheet roll 7. A resin component supplied from the first resin fastener 8 is applied to this plastic sheet 7a. (The resin component is composed of unsaturated polynisal, a curing organic peroxide, a mold release agent, and a thickener.

〉 Since the plastic sheet 7a is moving to the right in the figure, the chopped strands 2a 124a are not deposited in one place on the plastic sheet 7a, but are evenly mixed on the plastic sheet 7a. do. However, since the chopped strands 2a, 24a are oriented in arbitrary directions during the falling process, they are randomly distributed on the plane of the plastic seal 7a.

On the other hand, a plastic sheet 9a supplied from the second sheet roll 9 covers the chopped strands 2a, 24a from above. This plus deck sheet 9a is also coated with the same resin component as described above, which is supplied from the second resin fastener 10.

Therefore, the chopped strands 2a, 24a are impregnated with resin from both sides. In this way, the chopped strand 2 is sandwiched between the upper and lower plastic sheets 7a and 9a.
a, 24a are impregnated with resin and wound up by the winding roll 11. This results in a hybrid S in which glass fiber strands and carbon fiber strands are randomly dispersed.
MC is obtained. J5, this single layer hybrid SMC
Cut out to the specified size and use plastic sheet 7a.
, 9a may be peeled off to form a single layer hybrid SMC with 81 layers to form a multilayer hybrid SMC. Hybrid SM
The molding of C is a plastic sheet 7a.

This is done by heating and pressurizing the resin in a heating mold with the peeled portion 9a to harden the resin. In conventional hybrid SMGs, carbon 11 is a bundle of carbon fibers supplied from roving 4.
The number of bundled i-strands is generally 12,000 or more, but in the present invention, this and a carbon m-thread strand with 3,000 or less are used. In addition, when using 12,000 or more strands instead of using 3,000 or less carbon fiber strands, conventionally the chatuba 54 simply cuts the strands into a predetermined shape, but the chopper 54 We have improved this by adding a mechanism that can cut the strand to a predetermined length and simultaneously split it in the axial direction.
It may be processed into strands of 000 or less.

Examples of the fiber-reinforced resin composition of the present invention will be described below.

The relationship between the number of fiber bundles and the cross-sectional area of the carbon fiber strands in this example is shown in Table 1 above.

(First Example) The hybrid SMC in this example is a combination of a glass In chopped strand in which about 200 glass fibers are bundled and a carbon fiber chopped strand in which less than 3000 carbon fibers are bundled. However, these are dispersed in an unsaturated polyester resin.

In this example, the number of bundled carbon fibers is 500 and 1000.
A total of three types of hybrid SMGs were manufactured as described above with respect to FIG. 1, except for 3,000 books. The sum of the volumes of the carbon fiber strands 24 and the glass ll1i strands 2 accounted for 40% by volume of the entire hybrid SMC molded product, and the ratio of the carbon m-thick strands to the glass strands was 1:9.

In addition, in this embodiment, the glass IIH strand 2 and the carbon IIH strand 24 are simultaneously drawn out from separate rovings 1°4 and cut using separate choppers 5.54.
Although an example has been shown in which a common chopper is used for both strands 2.24, a common chopper may be used.

Next, as a comparative example for the fiber-reinforced resin composition of the present invention, the number of bundled carbon m m is 6000* and 1
Two types of hybrid SMC were manufactured using the same manufacturing method as in the above example using 2000 chopped strands of secondary X, and these were designated as Comparative Example 1 and Comparative Example 2. For experimental purposes, 10 layers of each of these single-layer hybrid SMCs and the hybrid SMC produced in the above example were laminated, and pressure molded at a temperature of 150°C and a pressure of 150 kg/cm2 for 3 minutes to form a plate-shaped molded product with a thickness of 3 mm. Obtained. Furthermore, a conventional G-8MC in which chopped glass fiber strands and a resin component were integrated was separately manufactured, and a molded product was prepared as Comparative Example 3 for experimental use. The composition and mechanical properties of fibers and resin in each hybrid SMC molded article were then measured.

The measurement results are shown in Table 2. In addition, rigidity and strength ti
T width 251. It was determined by performing a three-point bending test using a test piece with a thickness of 3 mm and a span distance of 80 mm.

Acoustic emissions were also measured during a three-point bending test. The fatigue test was conducted using fi 20 mm, 17 mm, 3 m, and 111 mm. Frequency 10 using a test piece with a length of 220 mm
1 (at Z, minimum stress 1Jl/11112, maximum stress 1
The test was carried out under a tensile condition of 0k (1/llI2), and the number of load repetitions until the test piece broke was determined.

As shown in Table 2, when the total glass fiber of the example was 100% by volume, 10% by volume (1:9) was replaced with 500 strands, 0.1000 strands, 1S, 000 strands, 0 carbon fiber strands. Hybrid SMC molded products are 60
Hybrid SMC molded product replaced with carbon fiber strands of 00 strands and 2000 strands (Comparative Example 1.2)
It can be seen that the mechanical properties are significantly improved compared to the G-8MC molded product (Comparative Example 3) made entirely of glass fibers.

Further, the bending rigidity and bending strength shown in Table 2 are shown in FIGS. 2 and 3. Note that 4. The graph is based on the cross-sectional area of the t1 roasted yarn 11 miscellaneous strands. In addition, the cross-sectional area of the carbon fiber strand is 0.01 mm.
2 (20Q fibers) data has also been added.

As is clear from Figures 2 and 3, the cross-sectional area of the carbon fiber strands is within the range of 0.01 to 0.15 mm2.
5 and the cross-sectional area was 0.6 mm2, which shows that the bending rigidity and bending strength are dramatically improved compared to the comparative example.

(Second Example) A glass fiber strand, a carbon fiber strand, and an unsaturated polyester resin were used, and the ratio of the glass fiber strand to the carbon fiber strand was (1:9), (2:
8), (3 near), three types of single layer hybrid S
MG was manufactured in the same manner as in the first example described above. The volume phase of the carbon fiber strand and the glass I-line strand was set to 40% by volume when the volume of the entire hybrid SMC was 100% by volume. In this example, carbon fiber strands having 1000 unfocused fibers were used as the carbon fibers.

(Experiment 42) A hybrid SMC using 12,000 carbon fiber strands as a comparative example and a conventional G-8MC made only of glass fiber were prepared in the same manner as in the first embodiment.
eManufactured.

Each of the above actual fII! l)im hybrid SMC and G-8MC as examples and comparative examples were pressure-molded at 101' Jfallu, temperature 150°C, and EE force 150 kQ/cmtFa to obtain a plate-shaped molded product with a thickness of 3fiI11. The bending rigidity, bending strength and fatigue degree of these molded products were measured and the measurement results are shown in Table 3.

When the volume% of the entire glass fiber is 100% resting, 10% by volume (1:9), 20% by volume (2:8), 30% by volume
The fiber-reinforced resin composition of this example, in which the volume % (3 near) was replaced with 1000 carbon fibers and 0 carbon fiber, respectively, had 10 volume % (1:9) and 20 volume % (2:8) of the total fibers. ,
Compared to the hybrid SMC molded product (Comparative Example 1) in which 30% by volume (3Nia) was replaced with 12,000 focused zero carbon fiber strands, the G-8MC made entirely of glass fibers
The mechanical properties are generally improved compared to the molded product (Comparative Example 2),
In particular, it was found that the bending strength was increased by over 20%.

Further, the bending rigidity and bending strength shown in Table 3 are shown in FIGS. 4 and 5. The horizontal axis of the figure is the ratio of carbon fiber volume to glass fiber deposition. The ratio is 0.2:9.8
and 4:6 data have also been added.

As is clear from FIGS. 4 and 5, when the ratio of carbon fibers to the total fiber amount is 2 to 30% by volume, the present invention has a higher hybrid effect (G-8MO) than the comparative example.
and the arithmetic mean value of C-8MC is large, and the hybrid effect becomes extreme when the bending modulus is 1.0 to 20 volume%, and the bending strength is 10 to 20 volume%. Despite the differences, the flexural modulus was significantly improved compared to the comparative example. However, it can be seen that when the proportion occupied by the fibers is greater than the above range, the carbon hybrid effect remains the same as in the comparative example, and the hybrid effect in the present invention reaches its maximum value within the above range.

(Third Example) A hybrid SMC was produced in the same manner as in the first example by changing the volume fraction occupied by all fibers under the condition that the volume ratio of glass fiber strands and carbon fiber strands was constant at 9:1. @Manufactured. Figure 6 shows the bending strength of hybrid SMC.

As is clear from FIG. 6, the bending strength of the present invention was superior to that of the comparative example, and reached its maximum value when the volume fraction was 40.

(Example of the 4th gallery) Under conditions where the ratio of the volume of the glass fiber strand to the volume of the carbon fiber strand was 9:1, and the ratio of the sum of the two deposits to the total material deposit was constant at 40%. A hybrid SMC was manufactured in the same manner as in Example 1, except that the lengths of the glass fiber strand and the carbon w4N strand were changed from 1/2 inch to 3/2 inch. FIG. 7 shows the bending strength of this hybrid SMC.

As is clear from FIG. 7, the bending strength of the present invention was superior to that of the comparative example, and reached its maximum value when the length was 1 inch.

(Fifth Example) Hybrid SMCs were produced in the same manner as in the first example except that an epoxy resin was used as the resin, with varying ratios of chopped glass fiber strands and chopped carbon fiber strands. The bending strength of this hybrid SMC is shown in FIG.

As is clear from Figure 8, the ratio of one sliver of carbon is 2 to 30
It can be seen that in the range of volume %, the bending strength of the present invention is dramatically improved over that of the comparative example.

(Sixth Example) Hybrid SMC with different cross-sectional areas of carbon fiber strands was manufactured in the same manner as in Example 1 except that epoxy resin was used as the resin. The bending strength of this hybrid SMC is shown in Figure 9. Shown below.

As is clear from Fig. 9, the bending strength is dramatically improved compared to the comparative example when the cross-sectional area of the carbon fiber strand is in the range of 0.01 to 0.15 mm2.
It can be seen that the maximum value is shown when .

(Seventh Example) Produced in the same manner as in Example 1, except that the blending ratio of chopped glass fiber strands and chopped carbon fiber strands was 9:1, and the total fiber ■ was 40% by volume. Cross-sectional photographs of the hybrid SMC ((25x magnification) are shown in Figures 10 to 13. The number of fibers in the chopped carbon fiber strands is 1000 in Figures 10 and 1512;
Figures 11 and 13 show 12,000 lines. Comparing FIG. 10 and FIG. 11, and FIG. 12 and FIG. It can be seen that no progress has been made.

(The following is a blank space) [Effects of the Invention] The hybrid SMC in which the glass 4A strands and the thin high-modulus free fiber strands are finely dispersed in each other according to the present invention has the advantage that the conventional glass fiber strands and the thick high-modulus inorganic fiber strands are finely dispersed. Compared to hybrid SMC that is uniformly dispersed, it has higher rigidity and can dramatically improve strength and durability. In particular, when compared to a G-SMC consisting only of glass 4a strands, the hybrid SMO of the present invention is far superior in mechanical properties by simply replacing the glass fiber strands with high modulus inorganic fiber strands. Generally, high-modulus inorganic fiber strands are expensive, but according to the present invention, even if a small amount of high-modulus inorganic fiber is suspended in a hybrid SMG, it is possible to expect characteristics superior to conventional hybrid SMC.

In addition, the manufacturing method of the hybrid SMC of the present invention is the same as the conventional one, so the hybrid SMC of the present invention has a higher quality than the conventional one.
can be manufactured at low cost.

4. P of the drawing! 1111 FJi! Figure 1 is a schematic configuration diagram of a manufacturing apparatus in one example of the 1eft reinforced resin composition shown in Figure 1, Figure 2 is a graph showing the flexural modulus of the resin composition in the example, Figure 3, Figures 5 to 9 are Tsumezu graphs showing the bending strength of the resin composition in each example, Figure 4 is a graph showing the bending rigidity of the resin composition in the example, Figure 10, Figure 1
Figure 2 is a cross-sectional photograph of a resin composition in an example of the present invention,
FIG. 11 and FIG. 13 are cross-sectional photographs of resin compositions of comparative examples.

2a...Glass 11M chopped strand 24a...
・Carbon fiber chopped strand patent applicant Toyota Motor Corporation! ! 3Guma Co., Ltd. Suda Central Research Institute Co., Ltd. Representative Patent Attorney Hiroshi Okawa Figure 3 Strand area (mrr?) Strand area (mmZ) Figure 4 Figure 5 C: A-5■U Sword's lath depth Child/Power → Fy Punishment Extinction Pegoso Figure 7 Trad length (inch) Figure 6 Main business record Usui's suspension service sheep (0/.) Figure 8 Figure 9 Commissioner of the Patent Office Yoshi 1) Moon Yi 1. Display of the case Patent Application No. 320268 of 1988 2, Name of the invention Fiber-reinforced resin composition 3, Person making the amendment Relationship to the case Patent applicant address 1 (320) Toyota-cho, Fukuda-shi, Aichi Prefecture Toyota Motor Corporation Co., Ltd. Company Representative: Murasaki Sasaki Address: 41-1 Yokomichi, Nagato, Nagakute-machi, Aichi-gun, Aichi Prefecture (360) Legal company Toyota Central Research Institute Representative: Noboru Komatsu 4, Agent Address: 3 Meieki, Nakamura-ku, Nagoya-shi, Aichi Prefecture 450 4 Kodama Building, No. 3-chome (Telephone: 052-583-9720) 5. Date of amendment order: March 9, 1999 (starting gate: March 14, 1999) 6. Domestic priority of the application subject to amendment An indication of the claim, a field for a brief explanation of the drawing, and a document proving the power of representation.

7. Contents of amendment (1) As stated in the application for correction attached to this document, the indication that domestic priority is claimed in the application is ``Patent Application No. 32 of 1988''.
In front of "No. 2375," we will add "Submitted on December 19, 1988."

(2) "Cross-sectional photograph of" on page 28, line 9 of the specification.
A photograph (magnification: 25
I corrected it as "double".

(3) In the 10th line of page 28 of the specification, the phrase "cross-sectional photograph of" must be replaced with "a photograph (magnification: 25x) showing the shape of fibers in the cross section of an SMC hybrid molded plate in place of a drawing. ” I am corrected.

(4) I will supplement the two copies of the power of attorney attached to this document.

8. List of attached documents (1) Correction application - letter (2) Power of attorney
Two or more

Claims (3)

[Claims] (1) In a fiber-reinforced resin composition consisting of a resin component and chopped strands dispersed in the resin component, the chopped strands have a higher elastic modulus than the glass fiber chopped strands obtained by focusing and cutting glass fibers and the glass fibers. 1. A fiber-reinforced resin composition comprising a high-elastic chopped strand obtained by bundling and cutting high-elastic inorganic fibers having a fiber bundle number of 3000 or less. (2) The fiber-reinforced resin composition according to claim 1, wherein the blending ratio of the high modulus inorganic fiber is 2 to 30% by volume when the total amount of fibers in the resin composition is 100% by volume. (3) The fiber-reinforced resin composition according to claim 1, wherein the resin component is a thermosetting resin such as unsaturated polyester, epoxy, or vinyl ester resin.