JP2000062103A - Processed cloth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sophisticated feel and enhance the durability by forming two pieces or more of a laminated layer, on one face of a base cloth consisting of PP as a main component, which is a specified resin layer such as PP of TPO, and arranging so that the content of TPO and a specified resin decreases gradually from the base cloth to the outermost layer. SOLUTION: A primary laminated layer 2 and a secondary laminated layer 3 containing a polyblended resin (TPO resin) consisting of PP and ethylene- propylene rubber and an ethylene (meth) acrylic ester copolymer are formed on at least, one face of a base cloth 1 based mainly on PP. These laminated layers 2, 3 are of such a component structure that the content of the TPO resin of the layers 2, 3 becomes gradually less in proportion to the proximity to the laminated layer 3 as an outermost layer or the content is nil, compared to the primary laminated layer 2 in contact with the base cloth 1. Reversely the content of the ethylene (meth) acrylic ester copolymer becomes gradually less in proportion to the proximity to the laminated layer 2 in contact with the base cloth 1 or the content is nil, compared to the laminated layer 3 as the outermost layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-weight, flexible and heat-resistant material suitable for use as a base material for packaging bags for packaging heavy items, outdoor sheets such as open sheets, construction sheets, and waterproof cloths such as hoods and tents. Creep property, adhesive strength between laminate layer and base cloth,
The present invention relates to a work cloth having good workability.

[0002]

2. Description of the Related Art A packaging bag for packaging heavy goods, various outdoor sheets, and various waterproof cloths are based on a woven cloth made of polyester or nylon, and a laminate layer made of a soft polyvinyl chloride resin on one or both sides of the base cloth. With vinyl chloride or mainly high density polyethylene (HDP
Polyethylene (PE) obtained by laminating low-density polyethylene (LDPE) on the surface of the flat yarn cloth of E)
A cross sheet is used. However, PVC bitterporin is heavy and contains chlorine due to the use of a soft polyvinyl chloride resin in the laminate layer, and when incinerated and discarded, dioxin is generated, which is said to cause environmental hormone inhibitors, and there is concern about pollution problems. Therefore, it is difficult to dispose of, and it lacks cold resistance, and there are problems such as migration of added plasticizer. Although the PE cloth sheet does not have such a problem, since the polyolefin resin of the same system is laminated, the adhesion of the laminate layer is good, but it is generally hard and does not have durability and high frequency welder suitability, and particularly heat creep resistance. However, the polypropylene cloth sheet (PP cloth sheet) obtained by laminating PP on polypropylene (PP) cloth has a drawback that the adhesiveness with the laminate layer is deteriorated even though the heat resistant creep resistance is good.

[0003]

Therefore, the present inventor has improved the above points, has a high-class feeling, does not make a rattling noise even in the winter, is light, and is easy to perform welding, spreading, folding, or carrying. As a result of various studies on a work cloth that is easy to work with, has weather resistance, has durability that can be used outdoors for a long time, has excellent waterproof performance, and has high-frequency welder suitability. The invention was completed,
An object of the present invention is to provide a processed cloth having the above-mentioned excellent physical properties and excellent processing suitability, and a packaging bag, an outdoor sheet, and a waterproof cloth to which the processed cloth is applied.

[0004]

In order to achieve the above object, in the present invention, two or more laminate layers are formed on at least one surface of a base fabric made of resin-made flat yarn or multifilament yarn containing PP as a main component. And a laminate layer containing a polymer alloyed resin (TPO resin) of PP and ethylene-propylene rubber (EPR), and an ethylene- (meth) acrylic acid ester copolymer. The closer to the outermost laminate layer from the laminate layer in contact with the cloth, the TPO in the laminate layer
The content of the resin is gradually low or does not include, and
A processed cloth characterized in that the content of the copolymer with ethylene- (meth) acrylic acid ester is low, or does not include, as it approaches the laminated layer in contact with the base cloth from the outermost laminated layer, The laminate layer is P
It is a polymer blend of a polymer alloyed resin (TPO resin) of P and ethylene-propylene rubber (EPR) and an ethylene- (meth) acrylic acid ester copolymer (hereinafter referred to as a modified polyethylene-based copolymer). It is a processed cloth characterized in that. As the modified polyethylene-based copolymer, an ethylene-methyl acrylate copolymer (E
MA), ethylene-ethyl acrylate copolymer (EE
A) and an ethylene-methyl methacrylate copolymer (E
It is preferably at least one selected from the group consisting of MMA).

That is, in the present invention, TPO is used as a laminate layer on at least one side of a base fabric made of resin-made flat yarn or multifilament yarn containing PP as a main component.
A polymer blend containing a resin and a modified polyethylene-based copolymer is used. The polymer blend containing the TPO resin and the modified polyethylene-based copolymer is not limited to a polymer blend consisting only of the both, but other polymers such as low density polyethylene, linear low density polyethylene, and / or It also means a polymer blend obtained by mixing a functional masterbatch such as a color masterbatch, a weather-resistant masterbatch, an antistatic masterbatch and the like based on these. By using such a polymer blend, the flexibility, the heat-resistant creep resistance, and the adhesion between the laminate layer and the base fabric could be improved. When the laminate layer is made of TPO resin alone, the necking phenomenon is large and the suitability for extrusion lamination is reduced. However, by polymer blending the modified polyethylene copolymer with the TPO resin, the neck-in phenomenon is reduced and the processability during manufacturing is improved. In addition, since the high frequency welder suitability is imparted by the polar group component such as the acrylic ester of the modified polyethylene copolymer, the workability of the processed cloth is also excellent.

The processed cloth of the present invention is flexible, has a high heat-resistant creep resistance, and has a large adhesive strength between the laminate layer and the base cloth, and is therefore suitable as a packaging material for heavy goods. A packaging bag using this as a base material has excellent strength. Since a high-frequency welder suitability can be imparted by further selecting a modified polyethylene-based copolymer containing a comonomer having a polar group component, it can be used as a base material for a flexible container to be heat-welded and spliced together. It is suitable. Further, since this processed cloth has flexibility, repeated bending characteristics due to wind and waves are improved and it is excellent in weather resistance. Further, since it is lightweight, it is easy to handle and therefore suitable for outdoor seats and waterproof cloths. And the processed cloth of the present invention has two or more laminate layers, and the layer in contact with or close to the base cloth contains more TPO resin than the adjacent layers and does not contain the modified polyethylene-based copolymer, By including a small amount, the adhesive force between the laminated layers is strong, the adhesive force between the laminated laminated layers and the substrate is also strong, and the content of the polar group component of the modified ethylene copolymer in the outermost layer can be increased. Therefore, the high frequency welder characteristics can be improved.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail. In the present invention, a PP resin is used as the base cloth. Here, the PP resin may be either a PP resin alone or a mixture of other polyolefin resins, and the PP resin is used as the main component. Therefore, the base cloth may be either a woven cloth woven of multifilament yarns made of PP resin or a cloth woven of flat yarns. Woven fabric of multifilament yarn is 10 to 30 with 300 to 1000 denier
Woven fabrics woven at a rate of book / inch are suitable, the cloth woven with flat yarns is about 1000 to 2500 denier, and the draw ratio is about 6 to 8 and the drawn yarns are 10 to 10 per inch in both warp and weft directions.
A cloth woven with about 20 yarns is suitable. However, when the multifilament yarn is used, it is possible to impart more flexibility to the woven fabric using the flat yarn.
In the present invention, since the PP resin is used as the base fabric, the weight is lighter, and it is 4
Weight can be reduced by 0%.

In the present invention, a polymer blend containing a polymer alloyed TPO resin of PP and EPR and a modified polyethylene copolymer is used as the laminate layer. The polymer blend containing the TPO resin and the modified polyethylene-based copolymer is not only a polymer blend consisting of the TPO resin and the modified polyethylene-based copolymer alone, but also the other polymers such as low density polyethylene and wire A low-density polyethylene, and a polymer blend obtained by mixing a functional masterbatch such as a color masterbatch, a weather-resistant masterbatch, an antistatic masterbatch and the like based on these. The TPO resin is a highly flexible resin having a melting point of 130 to 166 ° C., and the PP content of the TPO resin is at least 50% by weight or more. In particular, those containing 15% by weight or more of EPR are much more flexible. As the TPO resin, a reactor-made resin which is polymerized and formed in a multi-stage reactor when polymerizing PP and EPR is preferable because it is extremely uniformly finely dispersed. Specifically, it is commercially available from Montel Corporation as Catalloy resin (registered trademark).

In the present invention, the adhesiveness between the base cloth and the laminate layer is good. That is, when the base cloth and the laminating layer usually contain the same monomer, the adhesive strength is good, but the PP processed sheet obtained by laminating the PP resin on the PP base cloth does not adhere to the PP base cloth and the PP laminate layer. weak. However, as a laminate layer, T is used for PP cloth or PP woven fabric.
The work cloth of the present invention using a polymer blend containing a PO resin and a modified polyethylene copolymer has good adhesive strength. Furthermore, although TPO resin has a large necking and is less processable during extrusion lamination, the use of a modified polyethylene-based copolymer or a polymer blend of a modified polyethylene-based copolymer with another polymer results in It is possible to prevent deterioration in processability during manufacturing without impairing the characteristics. Specific examples of the modified polyethylene-based copolymer mixed with the TPO resin include EMA, EEA, EMMA and the like. Of these, a high frequency welder suitability can be imparted by mixing a copolymer of ethylene with a comonomer having a polar group component such as acrylic acid or acrylic acid ester.

The total thickness of the laminated layer is 40 μm to 200 μm.
.mu.m is preferable, and the laminated layer faces the outer side from the base fabric side. ． ． However, due to the ease of processing, there are two layers, a primary laminating layer and a secondary laminating layer.
It is preferable to provide a layer. The thickness of the primary laminating layer and the thickness of the secondary laminating layer may be the same or one of them may be thicker than the other. The innermost laminate layer has a blending ratio of TPO resin of 30 to 100% by weight, the modified polyethylene copolymer has a polar group component of 0 to 10% by weight, and the outermost laminate layer has a blending ratio of TPO resin of 0 to 40%. % By weight, the polar group component of the modified polyethylene-based copolymer is 8 to 30% by weight,
The content of the polar group component of the modified polyethylene copolymer is preferably 10 to 14% by weight. When there are three or more laminate layers, each laminate layer contains less TPO resin than the adjacent inner laminate layer and contains more modified polyethylene copolymer. In this way, by changing the mixing ratio of the resin in the laminate layers, the laminate layers can be firmly laminated. Furthermore, the adhesion between the laminated laminate layers and the base fabric is good, the welder characteristics are improved, and the processability during the secondary processing is improved.
Furthermore, when an antioxidant, an ultraviolet absorber or the like is added to the laminate layer, the weather resistance is improved and the durability is further increased.

The method for producing the processed cloth of the present invention is not different from the conventional laminating method, and at least one surface of the woven cloth is a known apparatus used for extrusion coating, calendering, T-die method and the like. May be used for lamination, and in this case, any method may be used, with or without an adhesive layer. The processed cloth according to the present invention is lightweight and flexible, has high heat-resistant creep resistance, and has a large adhesive strength between the laminate layer and the base cloth, and thus is suitable for a heavy-weight packaging material, and particularly, a material having welder suitability is a packaging material. More preferred as
Specifically, it is suitable as a base material for heavy bags and flexible containers used for packaging fertilizers and resins. Details will be described later. Further, the processed cloth of the present invention has flexibility as described above, has excellent heat resistance and creep resistance, and has a large adhesive strength between the laminate layer and the base cloth, and thus has excellent durability. It is also suitable as an outdoor seat such as an open sheet, a construction sheet, and a leisure sheet because it has excellent characteristics against repeated bending. Also, since it is lightweight, it is easy to handle. Furthermore, since the processed cloth of the present invention is highly flexible and light, easy to handle, and has an excellent waterproof function, it is also suitable as a waterproof cloth, and as the waterproof cloth, rain wing, hood, tent,
Examples include pallet covers and the like. A cross-sectional view of the work cloth according to the present invention is shown in FIG. In FIG. 1, 1 is a base cloth, 2 is a primary laminating layer, and 3 is a secondary laminating layer.

As mentioned above, the work cloth of the present invention is particularly suitable as a base material for flexible containers.
This point will be further described. Conventionally, a base material used for a flexible container is a polyolefin cloth sheet obtained by laminating a polyolefin resin of the same system on one or both sides of a cloth made of flat yarn such as PE or PP. However, a PE cloth sheet having a PE laminate layer, for example, has insufficient heat-resistant creep resistance because it uses PE cloth stretched and woven from a high-density polyethylene resin as a base cloth, and therefore has a step at a relatively high temperature. Storage is not suitable. PP made by stretching and woven PP resin as a base cloth
A PP cloth sheet using a cloth and having a PP resin as a laminating layer is not suitable for repeated use over a long period of time because of insufficient adhesion between the base cloth and the laminating layer, and has high rigidity, so that it can be folded or folded. The filling workability was difficult.

Further, when forming a flexible container from a polyolefin cloth sheet having a polyolefin laminate layer on a polyolefin cloth, the polyolefin cloth sheets are heat-welded and spliced together. Three adhesive factors are considered, namely, the adhesive strength between the cloth and the laminate layer, the breaking strength of the laminate layer itself, and the adhesive strength between the laminate layers, and of these, the adhesive strength between the base cloth and the laminate layer is particularly important. That is, the magnitude of the adhesive force between the base cloth and the laminate layer is directly reflected on the magnitude of the peel strength of the seal at the joint. The work cloth of the present invention has a large adhesive strength between the base cloth and the laminate layer, and thus the peel strength of the joint at the time of heat welding the work cloths becomes large, and further,
As described above, since the cloth made of resin flat yarn having PP as a main component and the PP woven fabric made of multifilament yarn are used as the base fabric, it has excellent heat creep resistance,
Since it is lightweight, it is easy to handle and is suitable as a communicable bag. In particular, the one using PP cloth as the base cloth can reduce the cost, and since the TPO resin is mainly used as the laminate layer, the adhesiveness with the PP cloth is excellent,
Since this TPO resin is polymer-blended with a modified polyethylene-based copolymer, the high frequency welder suitability is good, so this processed cloth is extremely excellent as a base material for flexible containers.

[0014]

The present invention will be described in more detail with reference to examples, but the present invention is not limited to the examples. The method for measuring the adhesive force between the base cloth and the laminate layer was to measure the peel strength of two sufficiently hot-air-welded 30 mm wide samples with an Instron type tensile tester. The peeling speed was 5 mm / min and the peeling angle was 90 °. Also, the high frequency welder suitability is YB-2 manufactured by Yamamoto Vinita Co., Ltd.
00 type voltage 200V, current 200 ~ 220mA,
Using an Instron type tensile tester, two 30 mm wide samples were heat-welded with a high-frequency welder under the conditions of a pressure of 4.0 kgf / cm ² and a sealing time of 2.0 seconds by a high-frequency seal having a frequency of 40 MHz. The peel strength was measured. Met.

Example 1 A 500-denier multifilament yarn mainly composed of a homopolymer PP resin was woven with 18 pieces per inch of the weft, and the primary laminating layer had a thickness of 50 μ on both sides.
m, and a secondary laminated layer having a thickness of 50 μm was laminated by a T-die extrusion method. The resin temperature at the time of extrusion was 280 ° C. The resin composition used for each laminating layer is as follows.

[0016]                               First layer Laminate layer Second layer     Catalloy KS-357 54 parts by weight 36 parts by weight     EMA 36 parts by weight 54 parts by weight     Color masterbatch (green) 5 parts by weight 5 parts by weight     Weather resistance masterbatch 5 parts by weight 5 parts by weight

Catalloy KS-357 is Montel JPO
A TPO resin manufactured by Co., Ltd., which is a polymer alloyed resin composed of polypropylene and ethylene-propylene rubber. Further, EMA is a product name of Lexpearl RB-4200 manufactured by JPO, and the polar group component has a MA content of 20%. Regarding the adhesive strength between the base cloth and the laminate layer of the obtained processed cloth, the peel strength after hot air and high frequency welding was 5 kgf / 3 cm, and the high frequency welding characteristics were good.

Comparative Example 1 Only the primary laminating layer shown in Example 1 was laminated on both sides of the PP cloth used in Example 1 by the same method as in Example 1. The thickness of the laminating layer was 100 μm. Two pieces of the obtained work cloth were welded with hot air and a high frequency welder in the same manner as in Example 1, and the peel strengths of the two pieces were measured. Peel strength of hot air welding is 6.5kgf / 3cm
The adhesive strength between the base cloth and the laminate layer was good.
Peel strength of welding by high frequency welder is 0.2kgf
It was / 3 cm, was peeled off at the welding surface, and had almost no welding force.

Comparative Example 2 On both sides of the PP cloth used in Example 1, only the secondary laminating layer shown in Example 1 was laminated directly on the base fabric in the same manner as in Example 1. The thickness of the laminating layer was 100 μm. Two pieces of the obtained work cloth were welded with hot air and a high frequency welder in the same manner as in Example 1, and the peel strengths of the two pieces were measured. Peel strength is 1.0kgf by either method
It was / 3 cm, and there was almost no adhesive force between the base fabric and the laminate layer. Peeling after the high frequency welder did not occur at the weld interface, indicating that the high frequency welder characteristics were good.

[0020]

As described above, according to the present invention, a PP resin is used as the base fabric, and a mixture of the TPO resin and the modified polyethylene-based copolymer resin is used as the laminate layer, so that it is similar to PVC tarpaulin. Although it is supple, its weight is reduced by 40% by weight compared with the same amount of PVC tarpaulin, and it is lightweight. And the processed cloth of the present invention has two or more laminate layers, and the layer in contact with or close to the base cloth contains more TPO resin than the adjacent layers and does not contain the modified polyethylene-based copolymer, By including a small amount, the adhesive force between the laminate layers is strong,
Since the adhesive force between the laminated laminate layers and the substrate is strong and the outermost layer can have a high content of the polar group component of the modified ethylene copolymer, the high frequency welder characteristics can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a work cloth according to the present invention.

[Explanation of symbols]

1 Base fabric made of PP 2 Primary laminating layer 3
Secondary laminating layer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shiro Yamamoto             1-4-16 Nihonbashi Bakurocho, Chuo-ku, Tokyo               Fujimori Industry Co., Ltd. F term (reference) 4F100 AK07A AK07B AK07C AK07D                       AK07E AK64B AK64C AK64D                       AK64E AK71B AK71C AK71D                       AK71E AL05B AL05C AL05D                       AL05E BA05 BA06 BA10C                       BA10E BA16 BA25B BA25C                       BA25D BA25E DG12A GB07                       GB16 GB87 GB90 JD05 JK06                       JL01 JL03                 4L033 AB03 AB04 AC03 AC11 AC15                       CA18 CA68

Claims (5)

[Claims] 1. A work cloth having two or more laminated layers on at least one surface of a base cloth made of resin-made flat yarn or multifilament yarn containing PP as a main component,
The laminate layer contains a polymer alloyed resin (TPO resin) of PP and ethylene-propylene rubber (EPR) and an ethylene- (meth) acrylic acid ester copolymer, and is the outermost layer from the laminate layer in contact with the base cloth. As it approaches the laminate layer of
The content of the resin is gradually low or does not include, and
A processed cloth characterized in that the content of the copolymer with ethylene- (meth) acrylic acid ester is low or does not include as the outermost laminate layer is closer to the laminate layer in contact with the base fabric. 2. The ethylene- (meth) acrylic acid ester copolymer is an ethylene-methyl acrylate copolymer (EMA) or ethylene-ethyl acrylate (EEA).
And ethylene-methyl methacrylate copolymer (EMM
The work cloth according to claim 1, which is at least one selected from the group consisting of A). 3. A packaging bag using the work cloth according to claim 1 or 2 as a base material. 4. An outdoor sheet using the work cloth according to claim 1 or 2 as a base material. 5. A waterproof cloth using the work cloth according to claim 1 or 2 as a base material.