JPH08267636A - Heat-resistant reinforced laminated body - Google Patents

Abstract

PURPOSE: To provide a heat-resistant reinforced laminated body with excellent tear resistance and adhesive strength. CONSTITUTION: A heat-resistant reinforced laminated body 12 is constituted of at least one uniaxially oriented body selected from a longitudinally uniaxially oriented net-like web (a), a transversely uniaxially oriented net-like web (b) or a uniaxially oriented multi-layered tape (c) each formed by laminating an adhesive layer (II) consisting of a polypropylene resin and a polyethylene resin on one face or both faces of a polypropylene resin layer (I) or a non-woven fabric 8 prepd. by laminating the above described uniaxially oriented body in the warp and weft directions so as to cross their oriented axes through the adhesive layer (II) or a woven fabric, and a base material 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminate of a uniaxially oriented body made of polypropylene or a nonwoven fabric or a woven fabric made of the same, which is excellent in heat resistance, tear resistance and adhesive strength.

[0002]

2. Description of the Related Art Conventionally, as a laminate of a base material such as paper or a plastic film and a non-woven fabric obtained by splitting a longitudinal uniaxially oriented film or a non-woven fabric or a woven fabric in which longitudinal uniaxially oriented multilayer tapes are laminated or woven , Kraft paper, synthetic resin film, etc., and a film in which low-density polyethylene is laminated on both sides of high-density polyethylene
A laminate with a polyethylene non-woven fabric or a woven fabric obtained by laminating the obtained reticulated film by laminating and laminating so that the orientation axes cross each other has been developed, and roads and building materials such as asphalt bags and cement bags and It is used for shopping bags. However, due to the diversification of applications, it is required to be inexpensive and have higher heat resistance,
Improvement is desired. To meet these demands,
Polypropylene-based resin is considered as a material having heat resistance superior to that of polyethylene nonwoven fabric. However, when a polypropylene resin is used, when a propylene-ethylene random copolymer having a lower melting point than the polypropylene resin is used as the heat seal layer (adhesive layer), the adhesive strength of the final product laminate obtained is However, there is a problem in that you cannot get what you want.

[0003]

DISCLOSURE OF THE INVENTION The present invention has been studied intensively in order to solve the above-mentioned problems, and as a result, by improving the adhesive layer of a multi-layer film based on polypropylene having high crystallinity, various groups have been developed. The present invention has been completed by finding that a laminate having excellent adhesive strength and the like between a material and a uniaxially oriented body or a nonwoven fabric or a woven fabric made of the same can be obtained. That is, an object of the present invention is to provide a heat resistant reinforced laminate excellent in tear resistance, adhesive strength and the like.

[0004]

According to claim 1 of the present invention, an adhesive layer (II) made of a mixture of a polypropylene resin and a polyethylene resin is laminated on one side or both sides of the polypropylene resin layer (I). Formed by (a) longitudinal uniaxially oriented reticulated web, (b) lateral uniaxially oriented reticulated web or (c) uniaxially oriented multilayer tape, or at least one kind of uniaxially oriented body, or the uniaxially oriented body having an adhesive layer (II) The present invention relates to a heat-resistant reinforced laminate comprising a non-woven fabric or a woven fabric laminated or woven in such a manner that the orientation axes cross each other via a substrate and a substrate. Claim 2
The base material is a synthetic resin film or a synthetic resin sheet,
The present invention relates to the heat resistant reinforced laminate, which is at least one selected from a foamed film or foamed sheet, a rubber sheet, paper, a random nonwoven fabric, a woven fabric, a metal foil and a porous film. A third aspect of the present invention relates to the heat-resistant reinforced laminate, wherein the mixture forming the adhesive layer (II) is composed of 95 to 70% by weight of polypropylene resin and 5 to 30% by weight of polyethylene resin. In claim 4, the polypropylene resin of the adhesive layer (II) is propylene-
The heat resistant reinforced laminate is an ethylene random copolymer resin, and the polyethylene resin is a high density polyethylene having a density of 0.94 g / cm ³ or more. A fifth aspect relates to the heat resistant reinforced laminate, wherein the uniaxially oriented body has an orientation magnification of 1.1 to 15. The heat-resistant reinforced laminate according to claim 6, wherein the polypropylene resin layer (I) has a thickness of 50 to 200 μm and the total thickness of the adhesive layer (II) is 5 to 150 μm before the uniaxially oriented body is oriented. Regarding

The present invention will be described in more detail below. The (a) longitudinal uniaxially oriented reticulated web or the (b) lateral uniaxially oriented reticulated web used in the present invention comprises a mixture of a polypropylene resin and a polyethylene resin on one or both sides of the polypropylene resin layer (I), and Using the adhesive layer (II) having a lower melting point than the polypropylene resin of the resin layer (I),
After uniaxially orienting a multi-layer film of two or more layers produced by extrusion molding such as a multi-layer inflation method or a multi-layer T-die method at an orientation magnification of 1.1 to 15, preferably 3 to 10, a splitter or a heat It can be obtained by performing a split process or a slit process in a zigzag pattern in a vertical or horizontal direction using a blade, and widening and heat-fixing as desired. In the case where slits are formed in a zigzag pattern in the horizontal direction, it is desirable to finely orient them in advance in the longitudinal direction by rolling about 1.1 to 3 times.

FIG. 2 is a partially enlarged perspective view of an example of (a) longitudinal uniaxially oriented reticulated web. In the figure, a longitudinal uniaxially oriented reticulated web 1 is obtained by laminating an adhesive layer (II) 3 on both sides of a polypropylene resin layer (I) 2 and carrying out longitudinal uniaxial orientation, and then splitting the fibers in the longitudinal direction by a splitter to widen them. It was done. In the figure, 4 is a trunk fiber and 5 is a branch fiber. FIG.
(B) It is a partially expanded perspective view of an example of a horizontal uniaxially oriented reticulated web. The horizontal uniaxially oriented reticulated web 6 is obtained by laminating the adhesive layer (II) 3 on both sides of the polypropylene resin layer (I) 2 and finely orienting it in the longitudinal direction, and then slitting it in a zigzag pattern in the lateral direction with a hot blade. The width is slightly widened in the lateral direction.

The uniaxially oriented multilayer tape (c) used in the present invention comprises a polypropylene resin layer (I) and an adhesive layer (II) made of a resin having a melting point lower than that of the polypropylene resin. Before and / or after cutting, a multi-layer film having two or more layers produced by extrusion molding such as the T-die method has an orientation ratio of 1.
It is uniaxially oriented at 1 to 15, preferably 3 to 10.

FIG. 4 is a partially enlarged perspective view of an example of (c) uniaxially oriented multilayer tape. The uniaxially oriented multilayer tape 7 comprises an adhesive layer (II) 3 on both sides of a polypropylene resin layer (I) 2.
Are laminated, oriented and cut.

As a typical material in the present invention,
The method for producing (a) a longitudinal uniaxially oriented reticulated web or (b) a lateral uniaxially oriented reticulated web comprises the following steps. (1) Film-forming step for producing a multilayer film by laminating an adhesive layer (II) made of a mixture of polypropylene resin and polyethylene resin on one or both sides of the polypropylene resin layer (I) by extrusion molding (2) Alignment Step of Multi-Layer Film (3) Split Step or Slit Step of Performing Split Treatment or Slit Treatment on Oriented Multi-Layer Film Parallel to Orientation Axis Further, if necessary, further widening is performed.

When a nonwoven fabric is produced by using the above (a) longitudinal uniaxially oriented reticulated web or (b) transverse uniaxially oriented reticulated web, the following steps are further added. (4) A latitudinal and weft laminating step of laminating the web so that the orientation axes intersect with each other through the adhesive layer (II). (5) Thermal fusion step of heating and fusing the laminated film.

Each step in the above manufacturing method will be described below. (1) In the film-forming step, an adhesive layer (II) comprising a mixture of a polypropylene-based resin and a polyethylene-based resin on the inner side and / or the outer side, with the polypropylene-based resin layer (I) as a central layer, preferably by inflation molding
Are arranged to prepare a multilayer film. (2) In the orientation process, 1.
1 to 8 times, preferably 5 to 7 times the primary orientation, and the second
After the step, secondary and tertiary uniaxial orientation is performed with an orientation magnification of 5 to 15, preferably 6 to 10 with respect to the initial dimension. (3) In the splitting step, the oriented multilayer film is brought into sliding contact with a splitter (rotary blade) that rotates at high speed to perform split processing (splitting) on the film.
In the slitting step, a rotating baking blade is pressed against the oriented multi-layered film to perform a staggered slit process to obtain a reticulated web. (4) In the latitudinal and latitudinal process, the reticulated web is widened as desired, and the latitudinal and latitudinal is laminated so that the orientation axes intersect each other through the adhesive layer (II). (5) In the heat-sealing step, the reticulated and weft-laminated reticulated web is supplied onto a heating cylinder and fixed so as not to contract in the width direction, and the orientation effect of the polypropylene resin in the center layer is not lost. Thus, the nonwoven fabric is obtained by performing heat fusion at a temperature not higher than the melting point of the polypropylene resin and not lower than the melting point of the adhesive layer. The method (b) for producing a polypropylene non-woven fabric using a laterally uniaxially oriented reticulated web is basically the same as the above.

On the other hand, in order to produce a non-woven fabric or a woven fabric using (c) the uniaxially oriented multilayer tape, first, the same procedure as in the case of using (a) the longitudinal uniaxially oriented reticulated web or (b) the transverse uniaxially oriented reticulated web is carried out. Film formation and orientation. The multilayer film obtained in the film forming step is cut into a tape shape having a width of 3 to 50 mm, preferably 5 to 30 mm, and then uniaxially oriented by rolling and / or stretching in the longitudinal direction, or uniaxially oriented and then formed into a tape shape. It is cut to obtain a uniaxially oriented multilayer tape. Next, the obtained uniaxially oriented multilayer tape is appropriately arranged, further laminated and heat-bonded to form a nonwoven fabric, or
Alternatively, it is woven using a loom.

If the orientation magnification in the process of producing the uniaxially oriented body of (a) to (c) is less than 1.1, the mechanical strength of the obtained woven fabric or nonwoven fabric is not sufficiently high. On the other hand, if the orientation magnification exceeds 15, it is difficult to perform orientation by a normal method, and an expensive device is required.

The orientation method may be either a rolling method or a stretching method. In the stretching method, the free uniaxial stretching method is particularly preferable. The rolling method in the present invention means that a thermoplastic resin film is passed between two heating rolls having a gap smaller than its thickness, and is pressed at a temperature lower than the melting point (softening point) of the resin film to obtain a thickness. A method of extending the length by the amount of decrease. The free uniaxial stretching method is a method in which the stretching distance (distance between the low speed roll and the high speed roll) is sufficiently long with respect to the film width, and the film is stretched while shrinking freely in the width direction. .

In the present invention, the polypropylene resin used in the polypropylene resin layer (I) is a polypropylene homopolymer, a random copolymer with other α-olefin containing propylene as a main component, or a block copolymer. An example is coalescence. Examples of the α-olefin include ethylene, butene-1, 4-methylpentene-1, and hexene-1. The content of these comonomers is selected from the range of 3 to 30 mol%. The polypropylene resin has an MFR of 0.01 to 50 g / 10 minutes, preferably 0.1 to 30 g / 10 minutes, more preferably 0.2 to 20 g.
It is selected from the range of g / 10 minutes.

Examples of the polypropylene resin used in the adhesive layer (II) in the present invention include the same or different polypropylene resins as those used in the polypropylene resin layer (I). However, it is important that the melting point of the resin mixture used for the adhesive layer (II) is lower than the melting point of the resin used for the polypropylene resin layer (I),
For this reason, the polypropylene resin of the adhesive layer (II) is preferably a random or block copolymer of propylene and α-olefin, and particularly preferably a random copolymer of propylene and ethylene, 1-butene or the like.

In the present invention, the polyethylene resin used in the adhesive layer (II) has a density of 0.85 to 0.97.
Examples thereof include a polyethylene homopolymer of g / cm ³ and a random copolymer or block copolymer containing ethylene as a main component and another α-olefin having a carbon number of 3 to 12.
Specific examples of the α-olefin include propylene, butene-1, 4-methylpentene-1, and hexene-1. Content of these comonomers is 3 to 30 mol%
Selected from the range of. As other examples, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-acrylic acid ester copolymer, ethylene-methacrylic acid ester copolymer and the like. Examples thereof include copolymers of ethylene and a monomer having a polar group. M of the polyethylene resin
FR is 0.01 to 50 g / 10 minutes, preferably 0.1 to 30 g /
It is selected from the range of 10 minutes, more preferably 0.2 to 20 g / 10 minutes. Among these, the density is 0.94 to 0.97 g / cm ³
The high-density polyethylene or the ethylene-α-olefin copolymer of (1) is preferable for maintaining heat resistance and the like.

In the uniaxially oriented body of (a) to (c), the thickness of the polypropylene resin layer (I) before orientation is in the range of 50 to 200 μm. The thickness of the adhesive layer (II) is 2.5 μm or more on one side and 5 μm on both sides in total.
If it is m or more, the required physical properties such as adhesive strength at the time of heat fusion are satisfied, but it is usually 5 to 150 μm, preferably 10 to 100 μm.
It is selected from the range of μm. Also, for manufacturing reasons,
The melting point of the resin of the adhesive layer (II) and the melting point of the resin of the polypropylene resin layer (I) are 5 ° C. or higher, particularly 10 to 5
It is preferable to have a temperature difference of 0 ° C. or more.

The mixing ratio of the mixture of the polypropylene resin and the polyethylene resin forming the adhesive layer (II) used in the present invention is 95 to 70% by weight of the polypropylene resin, preferably 90 to 75% by weight, and further preferably Is 90
To 80% by weight, the polyethylene resin is 5 to 30% by weight, preferably 10 to 25% by weight, more preferably 1
It is 0 to 20% by weight. If the blending ratio of the polyethylene resin is less than 5% by weight, it is difficult to obtain a nonwoven fabric having high adhesive strength, while if it exceeds 30% by weight, it becomes difficult to maintain heat resistance and adhesive strength.

The non-woven fabric or woven fabric used in the present invention means at least one kind of uniaxially oriented material selected from the above-mentioned (a) longitudinal uniaxially oriented reticulated web, (b) lateral uniaxially oriented reticulated web and (c) uniaxially oriented multilayer tape. And those obtained by laminating or weaving so that the orientation axes cross each other via the adhesive layer (II), and those further compounded.
As a specific combination of uniaxially oriented bodies, (1) (a) a nonwoven fabric A in which two longitudinal uniaxially oriented reticulated webs are laminated (a / a),
(2) (a) Non-woven fabric B obtained by laminating (a / b) a longitudinal uniaxially oriented reticulated web and (b) a lateral uniaxially oriented reticulated web, and (3) (c) laminating two sets of uniaxially oriented multilayer tapes (c / c). ) Nonwoven fabric C,
(4) (c) Woven fabric D woven from uniaxially oriented multilayer tape, (5) Nonwoven fabric A / Nonwoven fabric B (hereinafter abbreviated as (A / B), the same as others), (A / C) or (A / D) ) Non-woven fabric having a laminated constitution of (6) (B / C) or (B / D) non-woven fabric, (7) (C
/ D) non-woven fabric, (8) (a / C) or (a / D) non-woven fabric, (b / C / b) or (b / D / b) non-woven fabric, (9)
(C / a / C) or (C / b / C) non-woven fabric, (D / a /
D) or (D / b / D) non-woven fabric, (10) (A / C / A) or (A / D / A) non-woven fabric, (B / C / B) or (B /
D / B non-woven fabric, (11) (A / C / B) or (A / D /
The nonwoven fabric of B) etc. are mentioned.

FIG. 5 is a partial plan view of the nonwoven fabric A (a / a). The non-woven fabric A8 is (a) a laminate of two longitudinally uniaxially oriented reticulated webs 1 (a / a). FIG. 6 is a partial plan view of the nonwoven fabric C (c / c). The non-woven fabric C 9 is
(C) Two sets of uniaxially oriented multilayer tapes 7 are laminated (c / c). FIG. 7 is a partial perspective view of the woven fabric D. Woven fabric D 10 is obtained by weaving (c) the uniaxially oriented multilayer tape 7.

The substrate used in the present invention includes paper, synthetic resin film or sheet, foamed film or sheet, rubber sheet, porous film, random nonwoven fabric,
It is at least one selected from woven fabrics, metal foils, and the like. Hereinafter, these base materials will be sequentially described.

Examples of the paper include kraft paper, Japanese paper, glassine paper, paperboard and the like, which may be printed.

Examples of the synthetic resin film or synthetic resin sheet include polyolefin such as polyethylene and polypropylene, polystyrene, polyester, polyamide, ethylene-vinyl acetate copolymer saponified product, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polycarbonate, A film or sheet molded from acrylic resin or the like can be used. Among these, polyolefin
In particular, a polypropylene film or sheet is most versatile and suitable in terms of economy, heat resistance, mechanical strength and the like. These films or sheets may be directly attached to a non-woven fabric or the like by the T-die method or the like, and the laminating method is not particularly limited.

As the foam film or foam sheet,
Although not particularly limited, generally polyethylene,
Examples include those using a thermoplastic resin such as polyolefin such as polypropylene, polystyrene, polyester and polyamide. Of these, a foamed film or a foamed sheet made of polyolefin, particularly polypropylene, is preferable from the viewpoint of economical efficiency, heat resistance, mechanical strength and the like.

As the rubber sheet, ethylene-propylene copolymer rubber, ethylene-propylene-diene copolymer rubber, styrene-butadiene copolymer rubber, acrylonitrile-styrene copolymer rubber, SIS, SBS, polyurethane, etc. are used. However, the method of laminating is not particularly limited.

The porous film is produced from polyolefin such as polyethylene and polypropylene, polystyrene, polyester, polyamide, saponified ethylene-vinyl acetate copolymer, polyvinyl chloride, polyvinylidene chloride, polycarbonate and the like, but especially polypropylene. A porous film is preferable in terms of economy, heat resistance, mechanical strength and the like. The production of the porous film can be appropriately performed by a method of blending the above resin with a filler or the like, stretching, a method of extracting the film with a solvent, or the like, and is not particularly limited.

The random non-woven fabric includes those obtained by accumulating multifilaments and staple fibers. More preferably, it is a fibrous random nonwoven fabric using a high melting point first fiber and a low melting point second fiber. Specific examples of the fibrous random nonwoven fabric are as follows. (1) Random nonwoven fabric obtained by accumulating a mixture of a high melting point first fiber or its web and a low melting point second fiber or its web or a heat-adhesive fiber, (2) forming a core component A random non-woven fabric obtained by accumulating composite fibers composed of a high melting point first fiber and a low melting point second fiber forming a sheath component; (3) a high melting point first fiber and a low melting point first fiber A random non-woven fabric obtained by accumulating side-by-side composite fibers composed of two fibers, (4) a random non-woven fabric obtained by accumulating meltblown filaments, (5) high melting point synthetic pulp and / or fibers or a web thereof, Random non-woven fabrics and the like obtained by making paper with low melting point synthetic pulp and / or fibers or a web thereof are included.

Examples of the first fiber having a high melting point include synthetic fibers such as high density polyethylene, polypropylene, polyester, polyamide and acrylic resin, and natural fibers such as cotton, wool and hemp. If necessary, rock wool,
Mineral fibers such as metal fibers, glass fibers and whiskers may be used in combination.

Specific examples of the core-type or side-by-side conjugate fibers include high-density polyethylene (HDPE) / low-density polyethylene (LDPE), HDPE / ethylene-vinyl acetate copolymer (EVA), LDPE / polyvinyl alcohol. (PVA), polypropylene (PP) / propylene-ethylene copolymer (PEC), PP / HDPE, P
Examples include various combinations of P / PVA, polyester (PEs) / copolyester (CPEs), PEs / HDPE, PEs / PP, polyamide (PA) / PP, PA / HDPE and the like. Products include "NBF" (trademark, manufactured by Daiwa Spinning Co., Ltd.), "ES fiber" (trademark, Chisso)
Co., Ltd., "UC fiber" (trademark, Ube Nitto Kasei)
Ltd.), "Elves" (trademark, Unitika Ltd.),
"Sunmore" (trademark, manufactured by Sanwa Paper Co., Ltd.) and the like can be mentioned.

The non-woven fabric made of the melt blow filament is made of thermoplastic resin such as polyethylene, polypropylene, etc., polyolefin, polystyrene, polyester, polyamide, ethylene-vinyl acetate copolymer saponified product, polyvinyl chloride, polyvinylidene chloride, polycarbonate, etc. The melt blown nonwoven fabric to be manufactured is mentioned. Among these, polyolefins, especially those using polypropylene are preferable from the viewpoints of economy, heat resistance, mechanical strength and the like.

The woven fabric used as the substrate includes synthetic resin flat yarns, multifilaments, woven fabrics of organic and inorganic fibers such as natural fibers, synthetic fibers, glass fibers and carbon fibers, and is not particularly limited. Not a thing.

As the metal foil, aluminum, iron,
Examples of the foil include nickel, gold and silver. Among these, aluminum is particularly preferable in terms of economical efficiency and mechanical strength.

As the method for producing the laminate in the present invention, an extrusion lamination method or a dry lamination method,
Alternatively, a method in which the substrate and / or the non-woven fabric or the woven fabric are subjected to physical surface treatment such as corona discharge treatment and then heat-bonded, and the like can be mentioned.

In the present invention, various fillers such as carbon black, calcium carbonate, silica, etc., or antioxidants, flame retardants, cross-linking agents, colorants, pigments, antistatic agents are used without departing from the scope of the present invention. Additives such as UV absorbers and lubricants may be added.

[0036]

EXAMPLES The present invention will be described in more detail below with reference to examples. <Experimental Examples 1 to 6> In the film forming process, polypropylene (density = 0.90 to
0.91 g / cm ³ , MFR = 1.8 g / 10 minutes, trade name: Nisseki Polypro E120G, manufactured by Nippon Petrochemical Co., Ltd.) was used as a core layer, and propylene-ethylene random copolymer weight was used as an adhesive layer on both sides thereof. Combined (Product name: Chisso Polypro FK84
1, Chisso Co., Ltd. and high density polyethylene (density = 0.
956 g / cm ³ , MFR = 1.0 g / 10 min, trade name: Nisseki Stafren E710, manufactured by Nippon Petrochemical Co., Ltd.) was placed in the composition amount shown in Table 1, and the thickness was adhered. Layer 25μ
A multi-layer film having a width of 1 m and having a three-layer structure of m / core layer 100 μm / adhesive layer 25 μm was produced. Next, in the alignment step, the multilayer film was oriented to an orientation magnification of 9 while running. Next, in the split process,
The film was brought into contact while rotating the fiber splitting tool disclosed in JP-A 1-38979 and staggered in the longitudinal direction to produce a longitudinal uniaxially oriented reticulated fiber split film having a length of 20,000 m. Next, in the widening step, the longitudinal uniaxially oriented reticulated split fiber film was laterally widened 2.5 times to obtain a longitudinal uniaxially oriented reticulated web (a). Next, in the laminating step, the reticulated web (a) was laminated in a weft direction so that the orientation axes intersect, and heat-bonded at an adhesion temperature of 140 ° C. to obtain a nonwoven fabric A. Next, the nonwoven fabric A and various substrates were heat-bonded at a heating cylinder temperature of 140 ° C. Here, when the base material is a material other than PP, both the nonwoven fabric A and the base material are subjected to corona discharge treatment to have a surface tension of 42 dynes or more, and when the base material is PP, both are made of corona. Thermal bonding was performed without discharge treatment. FIG. 1 is a partially enlarged vertical sectional view of a reinforced laminate according to an example. The reinforced laminated body 12 is formed by laminating the nonwoven fabric A 8 and the base material 11 by thermal adhesion. The results of measuring the adhesive strength of the laminate are shown in Table 1.

The details of the substrate used are as follows. (1) Paper kraft paper, 76KP (2) Spunbond nonwoven fabric PP; Trade name: Syntex, Mitsui Petrochemical Industry Co., Ltd.
Manufactured, abbreviated as "SBF". (3) Melt blown non-woven fabric PP; trade name: Shanfine, manufactured by Toyobo Co., Ltd., “MB
Abbreviated as "F". (4) Porous film (1) Linear low-density polyethylene; trade name: Espoir, manufactured by Mitsui Toatsu Chemicals, Inc., abbreviated as "MCP (1)". (5) Porous film (2) HDPE; Trade name: Eleven, Tokai Pulp Co., Ltd., "M
CP (2) ”is abbreviated.

The test method for the adhesive strength is as follows. Test piece from laminate (width 20 mm x length 100 mm)
180 mm peeling strength of the test piece by cutting it out, peeling off one end of the test piece by hand about 30 mm in advance, and attaching the ends of the test piece to the grips above and below the Tensilon and pulling at a pulling speed of 300 mm / min. Was measured.

[0039]

[Table 1]

[0040]

EFFECTS OF THE INVENTION According to the present invention, by improving the adhesive layer of a multi-layer film based on polypropylene having high crystallinity, the adhesiveness to various substrates is improved,
It is possible to obtain a heat resistant reinforced laminate having excellent heat resistance, tear resistance and adhesive strength.

[Brief description of drawings]

FIG. 1 is a partially enlarged vertical sectional view of a reinforced laminate according to an example.

FIG. 2A is a partially enlarged perspective view of an example of a vertically uniaxially oriented reticulated web.

FIG. 3B is a partially enlarged perspective view of an example of a laterally uniaxially oriented reticulated web.

FIG. 4 (c) is a partially enlarged perspective view of an example of a uniaxially oriented multilayer tape.

FIG. 5 is a partial plan view of a nonwoven fabric A (a / a).

FIG. 6 is a partial plan view of a nonwoven fabric C (c / c).

FIG. 7 is a partial perspective view of woven fabric D.

[Explanation of symbols]

 1 (a) Vertical uniaxially oriented reticulated web 2 Polypropylene resin layer (I) 3 Adhesive layer (II) 4 Stem fiber 5 Branch fiber 6 (b) Horizontal uniaxially oriented reticulated web 7 (c) Uniaxially oriented multilayer tape 8 Nonwoven fabric A 9 Nonwoven fabric C 10 Woven fabric D 11 Base material 12 Reinforced laminate

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location D06M 17/00 D06M 17/00 Z

Claims (6)

[Claims] 1. The following (a), (b), or (b) formed by laminating an adhesive layer (II) made of a mixture of a polypropylene resin and a polyethylene resin on one or both sides of the polypropylene resin layer (I): At least one kind of uniaxially oriented material selected from (c), or a non-woven fabric or a woven fabric formed by weaving the uniaxially oriented material such that the orientation axes intersect with each other via the adhesive layer (II); A heat-resistant reinforced laminate comprising a laminate with a material, [uniaxially oriented body] (a) longitudinal uniaxially oriented reticulated web (b) lateral uniaxially oriented reticulated web (c) uniaxially oriented multilayer tape. 2. The base material is at least one selected from a synthetic resin film or sheet, a foam film or sheet, a rubber sheet, a paper, a random nonwoven fabric, a woven fabric, a metal foil and a porous film. The heat resistant reinforced laminate according to claim 1. 3. The mixture forming the adhesive layer (II) comprises:
The heat resistant reinforced laminate according to claim 1 or 2, which comprises 95 to 70% by weight of a polypropylene resin and 5 to 30% by weight of a polyethylene resin. 4. The adhesive layer (II) wherein the polypropylene resin is a propylene-ethylene random copolymer and the polyethylene resin is a high density polyethylene having a density of 0.94 g / cm ³ or more. The heat-resistant reinforced laminate according to any one of claims. 5. The orientation magnification of the uniaxially oriented body is 1.
The heat resistant reinforced laminate according to any one of claims 1 to 4, which is 1 to 15. 6. The polypropylene-based resin layer (I) before alignment of the uniaxially oriented body has a thickness of 50 to 200 μm, and the total thickness of the adhesive layer (II) is 5 to 150 μm. The heat-resistant reinforced laminate according to any one of claims.