JP2000265002A - Composite material of paper and resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite material of the paper disaggregated and a resin that has satisfactorily high elongation and impact resistance as well as good disposability by incorporating the paper, especially in an amount of 50 wt.% or more, into the composite material. SOLUTION: A composite material of paper and a resin is produced by kneading the paper disaggregated by a dry process with at least one kind of a resin. As a resin, an elastomeric resin such as EVA or the like is used. In addition to an elastomeric resin, a non-elastomeric resin such as a linear low density polyethylene or the like is blended to obtain the composite material of paper and a resin which has the properties of a tensile elongation at break of not less than 5% and an Izod impact value (notched) of not less than 4 Kgf.cm/cm2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite material of paper and resin.

[0002]

2. Description of the Related Art Conventionally, the technology of kneading paper with a resin, particularly a thermoplastic resin, and using it as a molding raw material has attracted attention as a method of recycling waste paper and a measure for reducing calories burned. If it is 51 wt% or more, it is treated as general garbage as paper and attracts attention from the viewpoint of disposability.

[0003] For a product made of 100% resin without using paper, various physical properties can be obtained depending on the type of resin. However, as described above, when the disposability is improved by adding a paper component, the composite material is produced. It was difficult to obtain sufficient physical properties (particularly elongation and impact resistance).
That is, even if the rigidity is high, only a brittle material having a low impact buffering property can be obtained. This tendency becomes more conspicuous when the amount of resin is reduced and the amount of paper is increased. For example, for a composite material of polyethylene and polypropylene and paper,
When the resin is 60% by weight, the tensile elongation at break is about 3-7.
%, The Izod impact value (with notch) exceeds 3 Kgf · cm / cm2, but when the resin is 49% by weight, the tensile elongation at break is about 2-3%, and the Izod impact value (with notch) is 3 Kgf · cm / cm2 or less. Furthermore, it is considered most desirable to obtain a material having sufficiently high elongation and impact resistance and high rigidity. However, it is difficult to simultaneously satisfy the three requirements of easy disposal by paper, elongation and impact resistance, and rigidity. It was extremely difficult.

[0004] On the other hand, as a method for producing the composite material of paper and resin, there are a method of kneading the paper into small pieces and kneading with the resin, and a method of kneading the fibrous defibrated material with the resin. The method can be roughly divided. In the former, the presence of small pieces of paper may be visible in the molded article, and the intended use may be limited in terms of appearance. There is an advantage that the plant fiber of the delicate material acts as a reinforcing material for the resin, and the mechanical strength can be improved as compared with the resin alone.

As for the latter, two methods can be further exemplified. As one method, the paper is crushed into small pieces, and the small pieces of paper are beaten in a molten resin solution and defibrated, so that defibration by beating and kneading are performed in one step. It is known how to do this. However, in this method, since the beating is performed in a molten resin liquid, a large shearing force and heat are applied during the beating, and the fibers are deteriorated. As another method of the latter, there is a method in which the paper is defibrated in advance, and the defibrated paper and a resin are kneaded, but this method is a wet method in which the defibration is dissolved using a large amount of water. There are two methods, a dry method using no water for dissolution.

In the case of the wet method, when the obtained fiber is dried to the official water content (about 8 to 9%), the hydrogen bonding force between the fibers increases, and it becomes difficult to knead and disperse the fiber by physical force. Problems have been pointed out that require large amounts of heat energy.

[0007] The dry method is disclosed in Japanese Patent Application Laid-Open No. 5-269736.
A method described in Japanese Patent Application Laid-Open No. H10-264, has been proposed. In this method, paper is defibrated by a dry method that does not use water for dissolution, a dispersibility improving agent is added to the defibrated paper, and the resulting defibrated fibers are kneaded with a resin. .

In this dry method, the official moisture content of paper (8 to 9)
%) And the defibrated fibers used for kneading contain a water content of about 8 to 9%. As a result, the moisture content of the composite material of the defibrated fiber and the resin is
When molding is performed using a composite material having a high water content that has absorbed water, vaporization of water at the stage of heating and melting during molding causes formation by foaming. Missing cavities occur in the product, and a normal molded product cannot be obtained.

Of course, water evaporates due to heating and heat generation during kneading, so that kneading can be carried out for a long time to reduce the water content of the composite material. However, drying does not depend excessively on kneading. As a result, the productivity of the kneading process is reduced, which causes an increase in cost. In production,
In order to obtain a stable composite material, it is important to keep production conditions such as heating temperature and kneading time constant. However, when the water content is controlled mainly with respect to the stability of the water content, the moisture content of the defibrated fibers largely depends on the atmospheric humidity, so that it becomes necessary to change the kneading heating temperature conditions and the kneading time according to the moisture content. Product stability of the entire composite cannot be achieved.

[0010]

DISCLOSURE OF THE INVENTION The present invention relates to a composite material of defibrated paper and a resin, which has high disposability by containing paper, especially containing more than 50% by weight of paper. It is an object of the present invention to provide a composite material having sufficiently high elongation and impact resistance, of course. In addition, the present invention
An object of the present invention is to provide a composite material of a defibrated paper and a resin, which can simultaneously satisfy three requirements of easy disposability, elongation and impact resistance, and rigidity. Still another object of the present invention is to provide a composite material which has stable quality and can be produced at low cost with high productivity.

[0011]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems by providing the following features. According to a first aspect of the present invention, there is provided a composite material of paper and resin obtained by kneading dry paper defibrated paper with at least one resin, wherein at least one of the resins is a rubber elastic resin. A composite material of paper and resin is provided. The second invention of the present application is:
In the composite material of paper and resin according to the first invention, the resin is made of at least two kinds of rubber elastic resin and non-rubber elastic resin having lower rubber elasticity than the rubber elastic resin. Provide what you do. The third invention of the present application is the composite of paper and resin according to the first or second invention, wherein the paper is contained at a value exceeding 50% by weight and the physical properties of the composite of paper and resin. Has a tensile elongation at break of 5% or more and an Izod impact value (with notch) of 4 Kgf
・ Provide a material characterized by being at least cm / cm2.
A fourth invention of the present application is the composite material of paper and resin according to any one of the first to third inventions, wherein the rubber elastic resin is
Ethylene-vinyl acetate copolymer (EVA), ethylene-
Propylene rubber (EPR), ethylene-propylene-diene rubber (EDPM), acryl-nitrile-butadiene rubber (NBR), styrene-butadiene rubber (SB
R), styrene rubber (SR), isoprene rubber (I
R) at least one member selected from the group consisting of natural rubber;
Provided is a seed. Fifth of the present application
The invention provides a composite material of paper and resin according to any one of the second to fourth inventions, wherein the non-rubber elastic resin is a thermoplastic resin such as polyethylene or polypropylene. I do. In a sixth aspect of the present invention, in the composite material of paper and resin according to any one of the first to fifth aspects, the water content of the defibrated fibers before kneading is adjusted to 1% or more and 5% or less. What is characterized in that: Accordingly, it is possible to provide a composite material of the defibrated paper and the resin, which has stable quality and can be produced at low cost with high productivity. still,
In carrying out each invention of the present application, the defibrated paper is arranged in a group of fibers of a fixed length, and this group of fibers has a fiber length variation of 80% of the fibers constituting the group of fibers. Is preferably set within the range of 2.5 mm or less. Thereby, it is possible to provide a composite material of defibrated paper and resin which stabilizes quality and improves productivity also in terms of fiber length. Further, in producing the composite material according to each invention of the present application, a step of fibrillating the paper by a dry method, a step of drying the obtained fibrillated fibers, and a step of kneading the dried fibrillated fibers with a resin. It is preferable to manufacture by the method provided with. This makes it possible to produce a composite material of paper and resin at a low cost under high productivity while stabilizing the quality. Further, during the production, 80% of the paper fibers constituting one group have a variation in fiber length of 2.5%.
A method of producing a plurality of fiber groups within the range of mm or less depending on the fiber length, selecting at least one group from the plurality of fiber groups, and kneading the resin. Is preferred. As described above, by selecting one from a group having a small variation in fiber length, the quality of the product can be stabilized.
By selecting more than one kind, the physical properties required for the composite material can be easily changed and adjusted. Therefore, it is possible to produce a composite material of paper and resin that can produce a composite material of paper and resin having various characteristics with stable quality.

The paper used in the present invention may be new paper, but used paper can be used from the viewpoint of resource reuse. Although the type of the used paper is not particularly limited, it is also possible to use a thick used paper such as a paper tube. Also, from the viewpoint of preventing the generation of dioxin during incineration, use paper that does not contain chlorine compounds, except paper treated with chemicals such as chlorine bleach, such as high-quality paper. Is desirable.

This paper is defibrated, but it is preferable that the paper is crushed by a crushing device into crushed pieces having a size of several mm to several cm square in order to improve the efficiency of the defibration. The defibration is a process in which paper which has been subjected to crushing treatment as necessary is formed into cotton-like fibers, and may be a wet method using water for dissolution, but water for dissolution may be used. It is preferable to carry out by a dry method without using. When the wet method is used, when the obtained fiber is dried to the official moisture content (about 8 to 9%), the hydrogen bonding force between the fibers increases, and it becomes difficult to knead and disperse the fiber by physical force. Is more advantageous.

It is desirable that the fiber lengths of the fibers obtained by this defibration are arranged in a fiber group having a fixed length. In this fiber group, it is most desirable that 80% of the fibers of the paper constituting the fiber group have a fiber length variation within the range of 2.5 mm or less. As an example, 80% of the paper fiber is 1mm
As the following groups, 2 ± 1mm group, 3 ± 1mm group,
Align the fiber length. As a method of adjusting the fiber length, in the case of the dry type, by changing the spacing between the blades for finely shearing the paper and the size of the mesh of the screen to the size corresponding to each group, the fiber Length can be aligned.
In addition, even in the case of this dry type, a small amount of water may be added to disintegrate the fiber in order to increase the shearing efficiency or prevent explosion. The water content of the obtained defibrated fiber is the official water content of paper of 8 to 9% or less.

Next, the defibrated fibers are dried if necessary. This drying is carried out at the normal moisture content of the paper (the official moisture content of the paper is 8 to
9%), which is advantageous in obtaining stable quality and high productivity. The water content is preferably adjusted to 5% or less, more preferably 1 to 3% for the purpose of maintaining physical properties and improving productivity. Here, the water content x is represented by x = (w0−w1) / w1 × 100. Here, w0 = weight before drying, w1 = weight after drying. Although there is no particular limitation on the drying method, a high-frequency heating drying method or an infrared irradiation heating drying method, which is advantageous for shortening the time, can be used other than the hot air circulation drying method using hot air. In addition, the water content was 5% without performing the drying process.
If the ratio exceeds, the productivity is low and the molding shrinkage ratio of the mechanical properties becomes large as compared with the case where the drying step is performed, and there is a possibility that sinking or the like may occur during molding. In addition, the water content before molding increases, and the need to dry the pellets again during injection molding increases. If the water content of the defibrated fibers is dried to less than 1%, the physical properties of the fibers are reduced due to excessive heating, and heat energy is wasted. Therefore, the water content is preferably 1% or more. Further, the length of the defibrated fiber is preferably 0.3 mm or more, but the group of 0.2 mm or less is excellent in precision moldability, and is used in combination with other fiber length groups. Thereby, it can also be used as a physical property adjusting material.

The dried defibrated fibers are mixed with a resin and kneaded. One or more resins can be used as the resin, and a rubber elastic resin is used as at least one of the resins. The rubber elastic resin preferably has a flexural modulus or a tensile modulus of 1000 Kgf / cm2 or less,
In particular, it is more preferably 700 kgf / cm2 or less. Specifically, an ethylene-vinyl acetate copolymer (EV
A), ethylene-propylene rubber (EPR), ethylene-propylene-diene rubber (EDPM), acryl-nitrile-butadiene rubber (NBR), styrene-butadiene rubber (SBR), styrene rubber (SR), isoprene rubber (IR), Natural rubber and the like can be exemplified, and one or more of these rubber elastic resins can be used. By using this rubber elastic resin, the physical properties (particularly, elongation and impact resistance) of the composite material can be remarkably improved as compared with the case where a resin such as a conventional polyethylene or polypropylene is used. More specifically, 50% by weight of paper
, The tensile elongation at break is 5% or more, and the Izod impact value (with notch) is 4 K
gf · cm / cm2 or more. Although the upper limit is not particularly limited, it is 5 to 35% in tensile elongation at break and 4 to 15 Kgf · cm / cm 2 in Izod impact value (with notch) due to problems with other physical properties and costs. Is enough.

In addition to the above rubber elastic resin, a non-rubber elastic resin having a lower rubber elasticity than the rubber elastic resin can be used in combination. The non-rubber elastic resin may have a rubber elasticity lower than that of the rubber elastic resin used in combination, but preferably has a flexural modulus or a tensile modulus of more than 1000 Kgf / cm2, and in particular, 700 kgf / cm2. It is more desirable to exceed. The non-rubber elastic resin may be any of thermoplastic and thermosetting as long as it can be used in combination with the rubber elastic resin, but is not limited to high-density polyethylene (HDPE), linear low-density polyethylene (LLPE), polypropylene ( PP), AB
Specific examples include thermoplastic resins such as S resin, polystyrene (PS), acrylonitrile styrene resin (AS), methacryl resin (PMMA), and acetal resin (POM). Rigidity can be added while maintaining impact resistance.

The blending and kneading of the resin and paper may be performed in separate steps or may be performed in the same step. A plurality of fiber groups having different fiber lengths may be prepared. The compounding ratio of the defibrated fiber and the resin is 5:95 to 90: 1 in weight ratio (the same applies hereinafter).
It is preferably about 0, but it is particularly preferable that the obtained product can be incinerated as paper by setting the defibrated fiber to a value exceeding 50% (about 51:49 to 90:10). Taking physical properties into account, 51:49 to 75: 2
It should be about 5. It is desirable to add 4% or more of the rubber elastic resin, more preferably 10% or more,
Thereby, elongation and impact resistance can be improved. Non-rubber elastic resin is not essential, but if added, non-rubber elastic resin (especially linear low density polyethylene)
Is desirably added up to about 45% of the total, more preferably about 30%. If it is too low, the meaning of addition is lost, and if it is added too much, it becomes difficult to improve elongation and impact resistance. Note that, in addition to the defibrated fibers and the resin, additives such as a coloring agent and a stabilizer can also be added.

The kneading of the defibrated fiber and the resin can be performed by a kneading device. This kneading device dissolves the resin while heating and agitates the resin to mix the resin with the defibrated fiber, thereby achieving the composite of the defibrated fiber and the resin. At this time, the water content is reduced to 1% or less (preferably 0.3% or less) due to the heating and heat generation during kneading, and the moisture content is reduced to 1% or less (preferably 0.3% or less). Moisture scattering time can be shortened, and cost and energy during kneading can be reduced. In this kneading, the defibrated fiber may be put into the kneading tank of the kneading device first, and then the resin may be put in later. On the contrary, after the resin is put in first, the defibrated fiber is put in. Alternatively, both may be mixed in advance and preliminarily mixed, and then charged. If the defibrated fibers are dried and left in the air for a long time, the defibrated fibers absorb moisture and become meaningless to be dried, so it is necessary to transfer to the kneading step while maintaining a low water content. is there. Specifically, it can be said that performing drying and kneading continuously is the simplest and most reliable method.However, after drying, storing in a closed state to maintain a low water content, or
Drying is performed again before the kneading step, or in any case, by performing at least one drying treatment before kneading, a low water content is obtained at the start of kneading.

Further, at the time of kneading, it is possible to use a pressurized stirring type kneading production method in which stirring is performed while applying pressure. In this method, because stirring is performed while applying pressure,
Shortening of time, good mixing, stabilization of physical properties, and reduction of paper fiber volume can be achieved. In particular, by agitating the defibrated fibers while applying pressure, the density of the defibrated fibers is increased, kneading with the resin is performed satisfactorily, time is shortened, mixing is improved, physical properties are stabilized, and the volume of paper fiber is reduced. Reduction is achieved. The compounding is performed under an air pressure of 0.10 to 0.17 MPa at the pressurizing pressure. First, a cotton-like defibrated fiber having a small density is compressed. The resin is charged and agitated in a state where compression has been performed to some extent, and almost no pressure is applied when kneading is completed. Also,
In this pressurized stirring type kneading production method, since there is a pressure, the number of rotations of the kneading screw can be low speed stirring of about 20 to 50 rpm. Since it is not necessary to perform high-speed rotation in this way, it is advantageous in that the paper fibers are not damaged.

As described above, one method of selecting the type of paper to be used is to prevent the generation of dioxin during incineration. However, there is a possibility that the paper type cannot be reliably selected. Stages to start: crushing, defibration,
It is also desirable to perform a dechlorination treatment at the stage of drying and blending. Also, from the viewpoint of suppressing the generation of dioxin, it is preferable not to use a recycled resin or to use a resin containing a chlorine compound such as a polyvinyl chloride resin.

The composite material of the defibrated fiber and the resin obtained by kneading (hereinafter, simply referred to as the composite material) is used by a conventional method of a synthetic resin. Generally, pellets are formed by a granulation process, and various products are molded by various resin molding machines. The molding method and the type of molding machine used for the molding method can be selected from those used for synthetic resin molding. Although the moisture content of the composite material is 0.4% or less, keep the obtained pellets in a moisture-proof package, etc., so that moisture is not absorbed between the composite material and resin molding. It is desirable to dry before molding so that the moisture absorbed afterwards is dried,
Further, for example, a drying device may be provided at an inlet of a raw material in a molding machine of an injection molding machine so that pellets of the composite material to be charged before molding are dried to a moisture content of about 0.3% or less. Good.

[0023]

EXAMPLES Examples of the present invention are shown in Table 1 together with comparative examples.
However, the present invention should not be construed as being limited to this embodiment.

In the first embodiment, a paper tube is crushed by a crushing device.
The crushed pieces were crushed into crushed pieces of about 30 mm square and defibrated by a dry defibrating device. At that time, 80% of the fiber of the obtained paper was 3 ± 1 mm
The size of the screen of the defibrating device was set so as to fall within the range. The obtained defibrated fibers were dried by a hot air drier to make the water content 4.42%. 51% by weight of the defibrated fibers were kneaded with a pressure-stirring kneading device together with 49% by weight of EVA which is a rubber elastic resin, and the obtained composite material according to Example 1 was granulated by a granulator to form pellets. did. The water content of the composite material according to Example 1 at the time of completion of granulation was 0.33%. After leaving this composite material for one month, a test piece was molded by an injection molding machine. The water content before molding, which indicates the water content of the composite material when injected into the injection molding machine,
1.13%. Table 1 shows the raw materials and mechanical properties of Example 1. Similarly, Examples 2 and 3 were manufactured by the same manufacturing method, and the raw materials and mechanical properties are shown in Table 1. In addition, EVA in each Example and Comparative Example
The one having an MFR of 15 g / 10 min and a vinyl acetate content of 28% by weight was used.

[0025]

[Table 1]

In Examples 4 to 7, 51% by weight of defibrated fibers, EVA as a rubber elastic resin, and LLPE as a non-rubber elastic resin were blended in the amounts shown in Table 2 and shown in the same table. Mechanical properties were obtained.

[0027]

[Table 2]

In Examples 8 to 10, the defibrated fibers 51
% By weight, EPR as a rubber elastic resin, and LLPE as a non-rubber elastic resin were blended in the amounts shown in Table 3 to obtain mechanical properties shown in the table. In Examples 11 and 12, 51% by weight of defibrated fibers and NB which is a rubber elastic resin were used.
R and LLPE, which is a non-rubber elastic resin, were blended at the blending amounts shown in Table 3, and the mechanical properties shown in the table were obtained.

[0029]

[Table 3]

Next, as Comparative Examples 1 to 4, Table 4 shows raw materials and mechanical properties when 100% by weight of a resin was blended without using paper fibers. In addition, as Comparative Examples 5 to 7, Table 5 shows raw materials and mechanical properties when the paper fiber was used at 40% by weight and the non-rubber elastic resin was used at 60% by weight. Comparative Example 8
10 to 51% by weight of paper fiber, non-rubber elastic resin 4
Table 5 shows the raw materials and mechanical properties when the test was performed at 9% by weight. In each table, "tensile strength""tensile elastic modulus"
Is "Izod impact value" according to JIS K7113.
Was tested according to JIS K7110 (notched).

[0031]

[Table 4]

[0032]

[Table 5]

[0033]

[Table 6]

As is clear from the above Examples and Comparative Examples, the tensile elongation at break (%) of the composite material obtained by blending 51% of paper fiber and 49% of non-rubber elastic resin in all Examples 1 to 12 Shows a value 2 to 10 times higher than that of Comparative Examples 8 to 10. As shown in Comparative Examples 5 to 7, in order to obtain a tensile elongation at break of 5% or more by blending the paper fiber and the non-rubber elastic resin, it is necessary to reduce the paper fiber to 40%. Can not satisfy the nature. Incidentally, in Example 3 in which the paper fiber was reduced to 40%, the highest tensile elongation at break of about 45% could be obtained, and in Example 2 in which the paper fiber was increased to 60%, the elongation of 19.36% was obtained. Is shown. Incidentally, it is considered that this property is not based on the property of EVA alone, but is based on the blending with the paper fiber and the above-mentioned manufacturing process. That is, as shown in Comparative Examples 1 to 4 of resin 100%, the tensile elongation at break
Among the four types of resins, the second lowest value, LLPE and P
It is inferior to P. Next, the Izod impact value (with notch) (Kgf · cm / cm2)
-12, paper fiber 51% and non-rubber elastic resin 49%
4 compared to Comparative Examples 8 to 10 which are composite materials containing
It shows a high value of 10 times or more. In addition, even when compared with Comparative Examples 5 to 7 in which the paper fiber was reduced to 40%, the value was about twice or more as high.

As described above, in the present invention, Examples 1 to
As shown in FIG. 3, the elongation and impact resistance could be improved by blending a rubber elastic resin such as EVA, and in particular, it was not obtained in comparison with a non-rubber elastic resin at 100% resin. The characteristics of the rubber elastic resin such as EVA can be brought out. Further, as shown in Examples 4 to 12, by adding a non-rubber elastic resin such as LLPE as a resin component in addition to the rubber elastic resin such as EVA, rigidity can be increased, and easy disposability and elongation can be achieved. And the three requirements of impact resistance and rigidity were simultaneously satisfied. These three requirements are E
Not limited to VA, it can be obtained by adding another rubber elastic resin as shown in Examples 8 to 12.

It should be noted that Example 3 in which the blending of the paper fiber was kept low exhibited relatively good mechanical properties, but it was considered that its use would be limited because it would leave a problem in terms of easy disposal. Can be In Example 7, the Izod impact value (with notch) was slightly inferior to those of the other examples. However, the compounding ratio of EVA was set to 16% or more, or changed to another rubber elastic resin. By doing so, it is thought that the value can be improved. Further, also in Example 11,
Although the Izod impact value (with notch) is slightly inferior to the other examples, the value can be increased by increasing the blending ratio of NBR to 11% or more or changing to another rubber elastic resin such as EPR. Can be improved. further,
Although not shown in the table, estimated calories burned (kcal / kg)
However, in Comparative Examples 1 to 3, 11000, and in Comparative Example 4, 980
0 and 7200 in Comparative Examples 8 to 10, whereas 6600 in Example 1. Thus, it is considered that the burnout calorie is very large for the resin-only material, and it is considered that the composite material containing paper has a low value and is highly disposable. Among them, the EVA composite material is advantageous in that it burns less calories than other composite materials and can be said to be a more environmentally friendly substance than PE or PP.

[0037]

According to the first invention of the present application, it is possible to provide a paper-resin composite material having not only good disposability but also sufficiently high elongation and impact resistance by containing paper. It is. The second invention of the present application relates to a paper and a resin which can simultaneously satisfy three difficult-to-stand requirements of elongation, impact resistance, and high rigidity, in addition to good disposability by containing paper. Can be provided. The third invention of the present application relates to a composite material of paper and resin which can obtain unprecedented mechanical properties such as excellent elongation and impact resistance even though the composition is classified as paper and discarded as paper. Was able to be provided. According to the fourth and fifth aspects of the present invention, it is possible to provide a composite material of paper and resin that can sufficiently exhibit the characteristics of the above-described aspects. Furthermore, in the sixth invention of the present application, a composite material that exhibits the effects of the above inventions, has stable quality, and can be produced at low cost under high productivity. It was something that could be provided.

Claims (6)

[Claims] 1. A composite material of paper and resin obtained by kneading defibrated paper with at least one resin, wherein at least one of the resins is a rubber elastic resin. A composite of paper and resin. 2. The paper and resin according to claim 1, wherein said resin comprises at least two kinds of rubber elastic resin and non-rubber elastic resin having lower rubber elasticity than said rubber elastic resin. Composite materials. 3. The paper contains the paper at a value exceeding 50% by weight, and the physical properties of the composite material of the paper and the resin are such that the tensile elongation at break is 5% or more, and the Izod impact value (notched).
Is 4 kgf · cm / cm 2 or more.
Or a composite material of the paper and resin according to 2. 4. A rubber elastic resin comprising ethylene-vinyl acetate copolymer (EVA), ethylene-propylene rubber (EP
R), ethylene-propylene-diene rubber (EDP)
M), acrylic-nitrile-butadiene rubber (NB
R), at least one member selected from the group consisting of styrene-butadiene rubber (SBR), styrene rubber (SR), isoprene rubber (IR), and natural rubber. Composite material of crab paper and resin. 5. The composite material of paper and resin according to claim 2, wherein the non-rubber elastic resin is a thermoplastic resin such as polyethylene or polypropylene. 6. The defibrated paper is defibrated by a dry method, wherein the moisture content of the defibrated fibers before kneading is adjusted to 1% or more and 5% or less. A composite material of the paper and resin according to claim 1.