JPH11291424A - Moisture permeable waterproof sheet and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a moisture permeable waterproof sheet having excellent watertightness and slip resistance, and suitable moisture permeability and a method for manufacturing it. SOLUTION: In the moisture permeable waterproof sheet comprising 1 to 400 g/m<2> of resin particles having a Vicat softening point lower by at least 20 deg.C than a melting point of a polyolefin resin and a mean particle size of 1 to 100 μm and fusion bonded to at least one side surface of a porous sheet obtained by at least uniaxially orienting a sheet containing 50 to 300 pts.wt. of an inorganic filler to 100 pts.wt. of a polyolefin resin; its moisture permeability is at least 400 g/m<2> .24 hr, its watertightness is 4 mm or less and its slipperiness is 0.6 or more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a moisture-permeable waterproof sheet and a method for producing the same. More specifically, the present invention relates to a moisture-permeable waterproof sheet having excellent water-tightness and slip resistance and having an appropriate degree of moisture permeability, and a method for producing the same.

[0002]

2. Description of the Related Art Usually, when a tiled roof is constructed, for example, in order to prevent corrosion of a roof base plate due to intrusion of moisture, for example,
A construction method is adopted in which a waterproof sheet such as oil-impregnated paper (asphalt felt) or waterproof paper is sandwiched between a tile and a field board. At that time, a tucker is hit to fix the waterproof sheet to the roof base plate. In addition, when roofing a tile, particularly in the case of a Western tile, a nail is punched into the tile and fixed to the roof base plate. For this reason, there is a problem that the waterproof sheet is pierced by a tucker or a nail, and moisture penetrates into the roof base plate from a gap between the pierced portions.

[0003] Since the waterproof sheet itself has no water vapor permeability, when moisture enters from the outside, it does not escape to the outside through the waterproof sheet. As a result, even if the waterproof sheet is used, corrosion of the roof base plate is prevented. There was a problem that it could not be prevented.

As a method for solving these problems, for example, Japanese Patent Application Laid-Open No. H5-248043 discloses a waterproofing sheet for a roof in which a cloth is laminated on the surface of a water vapor permeable polyolefin resin film. The sheet has a water tightness of less than 15 mm, a moisture permeability of 500 g / m ² · 24 hr or more, a slip property of 0.4 or more, and a breaking strength of 10 kg / 2.
A roof tarpaulin having a weight of 5 mm or more and a weight of 150 g / m ² or more is disclosed. It is described that as the fabric to be laminated on the water vapor permeable polyolefin resin film, a material having water vapor permeability and air permeability such as a nonwoven fabric, a net-like material, and a cloth is used.

[0005] The waterproof sheet for a roof is excellent in mechanical strength, moisture permeability and the like, since a material having moisture permeability and air permeability is laminated on a water vapor permeable polyolefin resin film. However, when a tucker or a nail or the like is hit against the roof base plate, moisture may enter through the hole, which is not always sufficient in terms of watertightness.

As a method for improving such watertightness,
For example, Japanese Unexamined Utility Model Publication No. 5-85628 discloses a waterproof and moisture-permeable roof sheet in which a predetermined waterproof coating pattern is formed on the surface of a nonwoven fabric. Further, it is described that the waterproof coating pattern is formed by applying a rubber-based resin to a position of a nail hole when nailing a roof tile. That is, the waterproof coating pattern is partially formed in order to suppress a decrease in moisture permeability.

[0007] However, it is difficult to specify and form the position of the nail hole, and moisture may enter from a portion where the waterproof coating pattern is not formed, and the watertightness is not satisfactory. Further, when a waterproof coating is applied to the entire surface, watertightness is improved, but water vapor permeability is lost. Thus, it has been difficult to simultaneously satisfy water tightness and water vapor permeability.

Further, in recent years, with respect to slip prevention, there is a demand for a member that is less slippery from the viewpoint of ensuring the safety of the builder, and at least the slip resistance with a tangent (tan θ) of the inclination angle θ of 0.6 or more is required. There is a need for improved moisture permeable tarpaulins. When the slip resistance becomes high, it is difficult to achieve with a porous sheet alone, and anti-slip processing is required.However, anti-slip processing is also the same as the above waterproof coating. It tends to decrease.

[0009]

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a moisture-permeable waterproof sheet which is excellent in watertightness and slip resistance and has moderate moisture permeability, and a method for producing the same. is there.

[0010]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that resin particles having specific thermal characteristics and particle diameters are formed on the surface of a water vapor permeable polyolefin resin film or a water vapor permeable polyolefin resin sheet. It has been found that the above object can be achieved by fusing under specific temperature conditions, and the present invention has been accomplished.

That is, the present invention relates to a porous sheet obtained by stretching a sheet containing 50 to 300 parts by weight of an inorganic filler with respect to 100 parts by weight of a polyolefin resin in at least one direction. Above, and at least 20 ° C. lower than the melting point of the polyolefin-based resin, the resin particles having an average particle diameter of 1 to 100 μm 1 to 400 g / m ^{2 is} a moisture-permeable waterproof sheet, wherein the moisture permeability is at least 400g / m ² · 24hr, watertightness 4mm or less, a moisture permeable waterproof sheet, wherein the slip is 0.6 or more.

The moisture-permeable waterproof sheet is formed by sheet-forming a resin composition containing 50 to 300 parts by weight of an inorganic filler with respect to 100 parts by weight of a polyolefin resin, and forming the sheet at least in a uniaxial direction by 1.05 to 8 parts. A porous sheet is obtained by drawing twice, and on at least one surface of the obtained porous sheet, a coating containing resin particles having a Vicat softening point at least 20 ° C. lower than the melting point of the polyolefin-based resin and having an average particle size of 1 to 100 μm. A liquid is applied to make the resin particles 1 to 400 g /
This is a method for producing a moisture-permeable waterproof sheet to be fused by m ^2, wherein after applying the coating solution, the formula (1) [Equation 2]

[0013]

(Equation 2) [In each formula, J: heating condition index, P: Vicat softening point (° C.) of resin particles, T: heating temperature (° C.), M: heating time (minutes), D: average particle size of resin particles (μm) ] Can be produced by heating under conditions where the heating condition index represented by the formula (1) is 15 to 45.

The moisture permeability of the moisture permeable waterproof sheet according to the present invention,
The water tightness and the slip resistance are characteristic values measured by a method described later.

The moisture permeable waterproof sheet of the present invention can satisfy all the requirements of moisture permeability, water tightness and slip resistance, which have been difficult to achieve with the conventionally known moisture permeable waterproof sheet. Excellent material. In other words, because of its excellent slip resistance, it is possible to safely and easily attach the moisture-permeable waterproof sheet onto the roof base plate when building a house. In addition, after construction, it is possible to prevent water from entering through the gap between the tiles and to easily release moisture inside the roof to the outside, so that corrosion of the roof base plate and the like can be prevented.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The porous sheet used in the present invention has an inorganic filler of 50 to 300 per 100 parts by weight of the polyolefin resin.
It is a porous sheet formed by melt-forming a resin composition containing parts by weight and then stretching the film at least uniaxially by 1.05 to 8 times.

As the polyolefin resin, a resin having a density of 0.860 to 0.940 g / cm ³ and a melt index of 0.5 to 20 g / 10 minutes is preferable. In particular, a linear low-density polyethylene which is a copolymer of ethylene and an α-olefin having 3 to 10 carbon atoms is preferable. The linear low density polyethylene may be a resin produced using a Ziegler catalyst or a resin produced using a single site catalyst such as a metallocene catalyst. Further, a branched low-density polyethylene may be mixed.

Examples of the inorganic filler include barium sulfate, calcium sulfate, magnesium sulfate, barium carbonate, calcium carbonate, magnesium carbonate, aluminum hydroxide, zinc oxide, magnesium oxide, titanium oxide, silica, mica, zeolite, talc, Clay, glass beads, aluminum powder, iron powder, carbon black, and the like are used. Barium sulfate and calcium carbonate are preferred. These may be used alone or in combination.

The amount of the inorganic filler to be added is 50 to 300 parts by weight based on 100 parts by weight of the polyolefin resin. The average particle diameter of the inorganic filler is preferably 10 μm or less. More preferably, it is 0.1 to 5.0 μm. The inorganic filler is preferably subjected to a surface treatment with a fatty acid or a metal salt thereof.

In the present invention, a stabilizer, a lubricant, a dispersant, an ultraviolet absorber, and the like may be added to the resin composition containing the polyolefin resin and the inorganic filler as long as the object of the present invention is not hindered.
Other additives such as a white pigment and a fluorescent whitening agent may be added.

Of these other additives, it is preferable to add a weather resistance improver having an ultraviolet absorbing ability. Examples of the weatherability improver having ultraviolet absorbing ability include 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2,2′-dihydroxy-4-methoxybenzophenone, and 2,2′-dihydroxy-4,4 ′. −
Dimethoxybenzophenone, 2-hydroxy-4-methoxy-2′-carboxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, 2,2 ′,
4,4'-tetrahydroxybenzophenone, 4-dodecyloxy-2-hydroxybenzophenone, bis (5-
Benzoyl-4-hydroxy-2-methoxyphenyl)
Benzophenone compounds such as methane,

2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-3 ', 5'-di-tert-butylphenyl) benzotriazole, 2- (2'- Hydroxy-3'-ter
t-butyl-5'-methylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-3 ', 5'
-Di-tert-butylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-5'-ter
t-octylphenyl) benzotriazole, 2-
(2'-hydroxy-3 ', 5'-di-tert-amylphenyl) benzotriazole, 2- [2'-hydroxy-3'-(3 ", 4", 5 ", 6" -tetrahydrophthalimidomethyl) -5'-methylphenyl] benzotriazole, 2,2'-methylenebis [4- (1,
UV absorbers represented by benzotriazole-based compounds such as [1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol]. Also, titanium oxide or the like can be used. These additives are added in an amount of 0.1 to 100 parts by weight of the polyolefin resin.
It is 01 to 5 parts by weight. Preferably it is 0.05 to 2 parts by weight.

A preferred method for producing the porous sheet used in the present invention will be exemplified. After mixing the above-mentioned polyolefin-based resin with an inorganic filler, and other additives such as a weather resistance improver if necessary using a Henschel mixer, a super mixer, a tumbler type mixer, etc., a single screw or twin screw type extruder is used. And kneaded into pellets. Next, these pellets are melted at a temperature equal to or higher than the melting point of the polyolefin-based resin,
Melting is performed using a known molding machine such as a die molding machine and an inflation molding machine to form a sheet. In some cases, it can be directly formed by an extruder without being pelletized.

The formed sheet is subjected to a known method such as a roll method or a tenter method from room temperature to the softening point of the resin (JIS).
(Measured by the method specified in K-6760), a porous sheet is produced by stretching at least in a uniaxial direction to cause interfacial separation between the resin and the inorganic filler. Stretching may be performed in multiple stages.

The stretching ratio in the present invention is 1.05 to 1.05.
It is 8 times, preferably 1.1 to 5 times. After stretching, if necessary, a heat setting treatment may be performed to stabilize the form of the obtained aperture. The heat setting treatment is performed at a temperature equal to or higher than the softening point of the resin and lower than the melting point, in a range of 0.1 to 10
A method of performing a heat treatment for 0 second may be used.

The thickness of the porous sheet of the present invention is not particularly limited.
A thickness of from 00 to 1000 g / m ² is preferred. Normal,
About 100 to 500 g / m ² is preferable. 100 g / m ²
If it is less than 1, the sheet is too light and tends to flap by wind at the time of construction, and if it exceeds 1000 g / m ² , its mechanical strength is satisfactory, but the sheet becomes too heavy and becomes difficult to carry when it is rolled. If the length per roll is shortened to reduce the weight, the required number increases and the workability tends to decrease, which is not preferable.

In the present invention, a fabric may be laminated on one or both sides of the porous sheet. As the fabric, for example, non-woven fabric made of synthetic resin, woven fabric, net-like sheet, nylon,
Examples thereof include cloths made of synthetic resin fibers such as tetron, cloths made of natural fibers such as cotton and hemp, and the like having good water vapor permeability and air permeability. Among them, a nonwoven fabric, a woven fabric, and a synthetic resin net-like sheet made of a synthetic resin are preferably used because of their low water retention. A preferable surface state of the fabric is one having a surface that is nearly smooth and having good mechanical strength. The basis weight of the fabric is not particularly limited, but usually a fabric weight of 10 to 200 g / m ² is used. Commercially available products of these fabrics include, for example, Nisseki Plast Co., Ltd., trade name: Warif EX, Warif LX, Hagiwara Kogyo Co., Ltd., trade name: Meltac E35
H and the like.

As a method of laminating the porous sheet and the fabric, for example, lamination is performed by a known method such as adhesion by heat fusion or adhesion with an adhesive. Due to the lamination, the pores of the porous sheet are closed, and as a result, the moisture permeability of the moisture-permeable waterproof sheet is reduced. Therefore, in order to suppress this decrease, the fused or bonded portion is formed in a lattice, a dot, a line, or the like. It is desirable to adhere in such a manner.

In the moisture-permeable waterproof sheet of the present invention, a specific amount of resin particles is fused to the entire front and back surfaces of the porous sheet, or a part thereof, in order to improve slip prevention and watertightness. When resin particles are fused to a part, the resin particles are fused to at least one of the front and back surfaces. That is, a portion not fused to the surface is fused to the back surface, and a portion not fused to the back surface is fused to the surface. Here, the surface of the moisture-permeable waterproof sheet is a surface on which the installer walks, that is, a surface in contact with the tile. The back surface is a surface that is in contact with the roof base plate. The surface on which the resin particles are fused is at least the surface on which the installer walks. When laminating a fabric on both sides of a porous sheet, a specific amount of resin particles is fused to the surface of the fabric. When laminating a fabric on one side of a porous sheet,
The resin particles are fused to the cloth side, and the surface is used as the surface.

The resin particles are preferably polyolefin resin particles. It is desirable that the polyolefin resin particles have a Vicat softening point of 20 ° C. or higher and lower than the melting point of the polyolefin resin forming the porous sheet by 20 ° C. or higher. It is more preferable that the melting point of the polyolefin resin is lower by 30 ° C. or more. If the Vicat softening point of the polyolefin-based resin particles is larger than the above value, it is necessary to increase the temperature in the heating step described later, and as a result, the pores of the porous sheet begin to be closed by heat, and as a result, the moisture permeability decreases. This is not preferred. On the other hand, if the softening point is lower than 20 ° C., the particles may be deformed at the time of coating, and voids between the particles are reduced, which is not preferable because the water vapor permeability is affected.

Examples of the base material of the resin particles include a polyethylene elastomer having a density of 0.86 to 0.89 g / cm ³ , a polyethylene ionomer, an ethylene-vinyl acetate copolymer, and the like. Since these are resins having rubber elasticity, when they are fixed to the roof base plate, when they are hit with tuckers, nails, etc., the sealing properties of the tucker holes, nail holes, etc. are good, and the water tightness of the sheet is improved. Extremely useful in maintaining.

The average particle size of the resin particles is preferably from 1 to 100 μm. When the thickness is less than 1 μm, the gap between the particles is clogged when heated in a heating step described later, and the moisture permeability of the porous sheet is undesirably reduced. On the other hand, if it exceeds 100 μm, the voids between the particles become too large, the fusion strength between the particles cannot be obtained when the particles are heated in a heating step described later, and the resin particles are not applied when a load is applied to the sheet during walking or the like during construction. Is undesirably peeled off and dropped, and the slip resistance of the sheet is reduced. More preferably, it is 3 to 80 μm.

As a method of adhering the resin particles to the surface of the porous sheet or the cloth, there is a method of applying an aqueous suspension containing the resin particles. The content of the resin particles in the aqueous suspension is preferably about 20 to 80% by weight. If the amount is less than 20% by weight, the content is small, so that the anti-slip effect is hardly exhibited. If the coating amount is increased to increase the anti-slip effect, it takes time to dry, and the obtained moisture-permeable waterproof sheet has a high moisture permeability. Is not preferred because it affects the
On the other hand, if it exceeds 80% by weight, the viscosity of the suspension becomes too high, and it becomes difficult to apply the suspension uniformly, which is not preferable.

The coating amount is from 1 to 400 g / dry weight.
m ² is preferred. More preferably, it is 2-200 g / m < ² >. If it is less than 1 g / m ² , the anti-slip effect is hardly exhibited,
When it exceeds 400 g / m ² , the weight of the obtained moisture-permeable waterproof sheet becomes too large, and there is a problem in workability, which is not preferable.
Although the aqueous suspension may be used alone, the aqueous suspension 100
It is more preferable to add 1 to 20 parts by weight of alcohol or the like to the parts by weight. Examples of the alcohol include methanol, ethanol, isopropanol and the like. Preferably it is isopropanol. In order to increase the adhesion between the porous sheet and the resin particles, it is preferable to perform a corona discharge treatment on at least the coated surface of the porous sheet.

As a method for fusing resin particles to the surface of a porous sheet or cloth, the above aqueous suspension is applied,
A method of heating and drying, and further fusing the resin particles is included. As a heating condition, there is a method of heating and fusing under a condition that a heating condition index represented by the above formula (1) is 15 to 45.

When the heating condition index is less than 15, the resin particles do not melt sufficiently, and a sufficient fusion strength between the resins and a sufficient fusion strength between the porous sheet or cloth and the resin particles cannot be obtained. Therefore, the slip prevention effect is not sufficiently exhibited. On the other hand, if it exceeds 45, the resin particles are completely melted, and the moisture permeability is undesirably reduced.

The moisture permeable waterproof sheet thus obtained is excellent in workability, water tightness and slip resistance and has a suitable water vapor permeability, so that it is most suitable as a roof waterproof sheet. It is.

The moisture permeable waterproof sheet obtained by the method of the present invention has a moisture permeability of at least 400 g / m ² · 24 hr. If such moisture permeability, usually because it is higher than the moisture permeability of water-resistant plywood generally used as a roof ground floor,
The moisture inside the roof can easily escape to the outside. The upper limit of the moisture permeability of the moisture-permeable waterproof sheet is preferably as high as possible, but according to the method of the present invention, 15,000 g / m ² ···
About 24 hours are obtained.

With respect to the water tightness, a watertightness of 4 mm or less is obtained. When the water tightness is 4 mm or less, intrusion of moisture such as rainwater from the outside can be sufficiently prevented, and it can be used as a roof waterproof sheet without any problem. In addition, slip resistance of at least 0.6 is obtained.
For this reason, even if the builder walks on the sheet and works, there is no possibility that the builder falls over. Further, there is no problem that slippage occurs between the moisture-permeable waterproof sheet and the roof base material, and that the installer falls down.

The physical properties in the present invention are measured by the following methods. 1. Melt index (g / 10 min) Measured under the conditions of a temperature of 190 ° C. and a load of 2160 g by a method specified in ASTM D-1238-57T (E). 2. Vicat softening point (° C.) Measured by a method specified in ASTM D1525-70. 3. Moisture permeability (g / m ² · 24 hr) Measured according to the method specified in JIS Z0208. The conditions are a temperature of 40 ° C., a relative humidity of 90%, and a calcium chloride method. The measurement time is 2 hours, and is converted per 24 hours. 4. Watertightness (mm) A waterproof sheet is placed on a 12 mm thick water-resistant plywood, and a colonial nail is nailed until the head of the nail rises about 10 mm from the plywood surface (n = 6). The inner diameter of the nail is 35 mm. Seal the transparent pipe and stand up. The pipe is pre-scaled to 300 mm. After the seal has dried, water is injected to a height of 300 mm of the pipe and 2
The amount of water loss after 4 hours is measured. From this measured value, a value obtained by subtracting a measured value obtained by measuring a water reduction amount by setting up a pipe with the bottom closed at the same time as a blank in order to subtract evaporation due to air temperature is defined as water tightness (unit: mm). 5. Slip property A sample in which a moisture-permeable waterproof sheet is attached to a weight with a load of 1 kg (6 cm x 10 cm x 2 cm) is made of wooden plywood (plywood).
Place it on the wood grain direction and measure the coefficient of friction [Toyo Seiki Co., Ltd.
And model: AN-S], and the tangent (tan θ) of the inclination angle (θ) when the sample starts to slide.

[0041]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the present invention is limited to the following Examples without departing from the scope of the invention. Examples 1 to 9, Comparative Examples 1 to 3 Linear low-density polyethylene [manufactured by Mitsui Chemicals, Inc., trade name:
Ultrazex 2022L, density 0.920g / c
m ³ , melt index (hereinafter referred to as MI) 2.1 g
/ 10 min, melting point: 120 ° C.) and 100 parts by weight of calcium carbonate [manufactured by Dowa Calfine Co., Ltd., trade name: SS]
T-40, average particle size 1.0 μm] 150 parts by weight, hydrogenated castor oil (manufactured by Ito Oil Co., Ltd., trade name: Custer Wax) 3.7 parts by weight, dehydrated castor oil (manufactured by Ito Oil Co., Ltd.)
Trade name: DCO] 3.7 parts by weight, and as weatherability improvers, trade names LA-31 and L, manufactured by Asahi Denka Kogyo KK
After mixing 0.25 part by weight of A-63P with a tumbler mixer, 200 parts were mixed using a tandem type extruder.
The mixture was uniformly kneaded at a temperature of ° C. and processed into pellets. The pellets were extruded using an extruder equipped with a T-die.
After being melt-formed at 40 ° C., it is uniaxially stretched in the machine direction at a stretch ratio of 3.0 times between a preheating roll and a stretch roll heated to 70 ° C. to obtain a porous sheet having a basis weight of 100 g / m ^2. Was.

As an aqueous polyolefin suspension, an aqueous ethylene-vinyl acetate copolymer suspension [Mitsui Chemicals Co., Ltd.] was applied to the surface of the porous sheet (the surface on which the installer walks).
Product name: Chemipearl V-100, Vicat softening point 4
0 ° C., average particle size 12 μm, solid content concentration 40% by weight],
[Mitsui Chemicals Co., Ltd., trade name: Chemipearl V-300,
Vicat softening point 40 ° C, average particle size 6μm, solid content concentration 4
0% by weight] or a polyethylene-based thermoplastic elastomer [manufactured by Mitsui Chemicals, Inc., trade name: Chemipearl A-10]
0, a Vicat softening point of 54 ° C., an average particle size of 4 μm, a solid content of 40% by weight] and 95 parts by weight of isopropanol were mixed with 5 parts by weight, and the mixture was coated so as to have a basis weight shown in [Table 1].

Next, in an oven, Examples 1 to
In No. 9, the heating condition index calculated using the formula (1) was in a range of 15 to 45, and Comparative Examples 1 to 3 were used.
Then, heating was performed under conditions where the heating condition index was outside the range of 15 to 45, and drying and fusion of the resin particles were performed to obtain a moisture-permeable waterproof sheet. Specific production conditions and characteristics of the moisture-permeable waterproof sheet are shown in [Table 1] and [Table 2]. Heating condition index is 15
In the range of ~ 45, moisture permeability, water tightness and slip resistance were all good. On the other hand, when the heating condition index was less than 15, slip resistance was not sufficiently exhibited, and when the coated surface was rubbed with a finger, detachment of the resin particles from the sheet was observed. Also,
Those with more than 45 resulted in low moisture permeability.

Example 10 A moisture-permeable waterproof sheet was obtained in the same manner as in Example 1, except that the basis weight of the porous sheet was 200 g / m ² . The manufacturing conditions and characteristics of the moisture-permeable waterproof sheet are shown in [Table 1] and [Table 2].

Example 11 On the side corresponding to the surface of the porous sheet obtained in the same manner as in Example 1, a woven cloth [trade name: Meltac E35H, manufactured by Hagiwara Kogyo Co., Ltd .;
/ M ² ] at a heat fusion temperature of 112 ° C. and a heat fusion pressure of 60 N /
After laminating by heat fusion under the condition of cm ^2, an aqueous ethylene-vinyl acetate copolymer suspension [manufactured by Mitsui Chemicals, Inc., trade name: Chemipearl, in the same manner as in Example 1] V-
100] was obtained in the same manner as in Example 1 except that the coating weight was as shown in [Table 1]. The manufacturing conditions and characteristics of the moisture-permeable waterproof sheet are shown in [Table 1] and [Table 2]. This moisture permeable waterproof sheet is moisture permeable, water tight,
Both slip resistances were good.

[0046]

[Table 1]

[0047]

[Table 2]

[0048]

The moisture-permeable waterproof sheet of the present invention is excellent in watertightness, so that intrusion of moisture from the outside can be prevented. Even if a small amount of moisture enters, it can be released to the outside as water vapor because of its moderate moisture permeability. Therefore, corrosion of the roof base plate due to moisture can be prevented. In addition, it has good slip resistance and excellent workability, and is most suitable as a moisture-permeable waterproof sheet.

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI C08L 23/08 C08L 23/08 E04D 12/00 E04D 12/00 N (72) Inventor Tsutomu Iseki Tangodori, Minami-ku, Nagoya-shi, Aichi Prefecture 2-1-1, Mitsui Chemicals, Inc.

Claims (14)

[Claims] 1. A porous sheet obtained by stretching a sheet containing 50 to 300 parts by weight of an inorganic filler with respect to 100 parts by weight of a polyolefin-based resin in at least one direction, has a Vicat softening point of 20 ° C. or more, and A resin particle having an average particle diameter of 1 to 100 μm lower than the melting point of the polyolefin resin by at least 20 ° C.
m ² fused moisture permeable waterproof sheet, having a moisture permeability of at least 400 g / m ² · 24 hr, a watertightness of 4 mm or less,
A moisture-permeable waterproof sheet having a slip property of 0.6 or more. 2. The polyolefin resin has a density of 0.90.
5 to 0.940 g / cm ³ , melt index 0.5
Ethylene having a carbon number of 3 to 10 and α of 20 g / 10 min.
The moisture-permeable waterproof sheet according to claim 1, which is a copolymer with an olefin. 3. The resin particles have a density of 0.86 to 0.89 g.
The moisture-permeable waterproof sheet according to claim 1, wherein the moisture-permeable waterproof sheet is at least one kind of polymer particles selected from a polyethylene elastomer, a polyethylene ionomer, and an ethylene-vinyl acetate copolymer having an average particle size of / cm ³ . 4. The moisture-permeable waterproof sheet according to claim 1, further comprising 0.01 to 5 parts by weight of a weather resistance improver based on 100 parts by weight of the polyolefin resin. 5. The moisture-permeable waterproof sheet according to claim 1, wherein a fabric is laminated on at least one surface of the porous sheet, and resin particles are adhered to the surface of the fabric. 6. The moisture-permeable waterproof sheet has a basis weight of 100 to 100.
Moisture-permeable waterproof sheet according to claim 1, wherein it is 0 g / m ^2. 7. The moisture permeable waterproof sheet according to claim 1, wherein the moisture permeable waterproof sheet is a roof moisture permeable waterproof sheet. 8. A resin composition containing 50 to 300 parts by weight of an inorganic filler with respect to 100 parts by weight of a polyolefin-based resin is formed into a sheet, and the sheet is formed into a sheet at least in one axial direction.
The porous sheet is stretched by 0.5 to 8 times to form a porous sheet, and at least one surface of the obtained porous sheet has a Vicat softening point of 20 ° C.
Above and at least 20 ° C. lower than the melting point of the polyolefin-based resin, a coating liquid containing resin particles having an average particle size of 3 to 100 μm is applied, and the resin particles are coated at 1 to 400 g /
This is a method for producing a moisture-permeable waterproof sheet to be fused by m ^2, wherein after applying the coating liquid, the following equation (1) is obtained. [In each formula, J: heating condition index, P: Vicat softening point (° C.) of resin particles, T: heating temperature (° C.), M: heating time (minutes), D: average particle size of resin particles (μm) ] The method for producing a moisture-permeable waterproof sheet, wherein the heating is carried out under a condition where the drying condition index represented by the formula (1) is 15 to 45. 9. A polyolefin resin having a density of 0.90
5 to 0.940 g / cm ³ , melt index 0.5
Ethylene having a carbon number of 3 to 10 and α of 20 g / 10 min.
The method for producing a moisture-permeable waterproof sheet according to claim 8, wherein the method is a copolymer with an olefin. 10. The resin particles having a density of 0.86 to 0.89.
9. The production of a moisture-permeable waterproof sheet according to claim 8, wherein the sheet is at least one kind of polymer particles selected from polyethylene-based elastomer, polyethylene-based ionomer and ethylene-vinyl acetate copolymer having a g / cm < ³ >. Method. 11. The method for producing a moisture-permeable and waterproof sheet according to claim 8, wherein 0.01 to 5 parts by weight of a weather resistance improving agent is contained based on 100 parts by weight of the polyolefin resin. 12. The method for producing a moisture-permeable waterproof sheet according to claim 8, wherein a fabric is laminated on at least one surface of the porous sheet, and resin particles are fused to a surface of the fabric. 13. A water vapor transmission rate of at least 400 g / m ^2.
24 hr or, watertightness 4mm or less, the slip resistance is 0.6 or higher, according to claim 8 moisture permeation method of manufacturing a waterproof sheet, wherein the basis weight is 100 to 1000 g / m ^2. 14. The method for producing a moisture-permeable waterproof sheet according to claim 8, wherein the moisture-permeable waterproof sheet is a roof moisture-permeable waterproof sheet.