JP2010229567A - Hand tearabile base material and adhesive tape using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base material having excellent productivity, and having excellent hand tearability improved in the problem of fibrous cut end, and to provide an adhesive tape using the base material. <P>SOLUTION: [1] The hand tearable base material obtained by arranging synthetic fibers as a warp yarn and a weft yarn has a tear strength in the warp direction of the base material larger than that in the weft direction, and the warp yarn uses a cation-dyeable yarn having an elongation less than 30%. [2] In the tearable base material according to [1], the warp yarn is a normal-pressure cation-dyeable polyester yarn having a strength of not more than 0.04 N based on 1 dtex, and the density of the warp yarns in the base material is within the range of 40-70 yarns per inch. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a hand-cutting imparting substrate and an adhesive tape using the same.

For many years, substrates made of spun yarn of rayon suf have been used for tapes and sheets used for adhesive tapes, etc., but the strength decreases when wet, and peeling due to swelling occurs. There are disadvantages such as. In order to overcome this drawback, improvements have been made in the past.
Specifically, among the modified polyesters obtained by copolymerizing an isophthalic acid component having a metal sulfonate group in an amount of 1.5 to 8 mol% with respect to all dicarboxylic acid components, a polyester false twisted yarn having an elongation of 30% or more. A base material using as a warp has been proposed.
The pressure-sensitive adhesive tape using this substrate is characterized by good hand cutting properties and beautiful cuts (Patent Document 1).

On the other hand, a base material in which a polyester multifilament yarn is arranged on a warp and a weft, the warp is a flat yarn, and the weft is a composite false twist yarn or a partially fused composite false twist yarn whose fineness is larger than that of the warp. The used base material is also proposed.
In the adhesive tape using this base material, the warp, that is, the strength of the adhesive tape in the longitudinal direction of winding is smaller than the strength of the weft (yokoto), so the longitudinal direction of the adhesive tape Can be easily cut in the vertical direction (Patent Document 2).

However, the pressure-sensitive adhesive tape obtained using the base material obtained by these conventional techniques results in the warp yarns near the end immediately before completely cutting when the pressure-sensitive adhesive tape is torn by hand without cutting in a straight line. In particular, there is a problem in that the cut surface becomes unsightly because the yarn is cut from one end of the cut surface in a stretched manner like a beard.
This problem is widely referred to as the beard problem, and various proposals have been made to solve the beard problem.
Specifically, it is a base material in which warp yarn is made of suf yarn and weft yarn is made of polyester resin, and the surface of the base material is treated with an anchor coating agent containing an ethylene vinyl acetate copolymer. An adhesive tape using a base material has also been proposed (Patent Document 3).
However, in order to actually obtain an adhesive tape using this substrate, there is a problem in productivity, such as a complicated process is required.

JP-A-4-222240 JP 2003-253543 A JP 2007-270000 A

  An object of the present invention is to provide a base material having excellent productivity and improved hand cutting ability with improved whisker problems, and an adhesive tape using the same.

  As a result of intensive studies by the present inventors in order to solve the above problems, it was found that a base material using a cationic yarn having an elongation of less than 30% for the warp is suitable for the purpose of the present invention, and the present invention was completed. It came to do.

That is, the present invention
[1] A base material in which synthetic fibers are arranged on warps and wefts, wherein the tear strength in the warp direction relative to the base material is greater than the tear strength in the weft direction,
The warp yarn is made of a cationic yarn having an elongation of less than 30%.

The present invention also provides
[2] The warp yarn is a normal pressure cationic dyeable polyester yarn having a strength of 0.04 N or less based on 1 dtex,
The hand cutting ability imparting substrate according to the above [1], wherein the warp density of the substrate is in the range of 40 to 70 per inch.

The present invention also provides
[3] The hand cutting property imparting base material according to the above [1] or [2], wherein the tear strength in the warp direction relative to the base material is 1.2 times or more the tear strength in the weft direction. .

The present invention also provides
[4] The above [1] to [3], wherein at least one selected from the group consisting of polyolefin resin, polyolefin foam, polyurethane foam, metal foil and paper is laminated on at least one surface of the substrate. The hand-cutting imparting base material according to any one of the above is provided.

The present invention also provides
[5] The hand-cut property imparting substrate according to any one of the above [1] to [4], wherein the tear strength in the weft direction relative to the substrate is 1.2 N or less.

The present invention also provides
[6] An adhesive tape having an adhesive layer on at least one surface of the hand-cutting imparting substrate according to any one of [1] to [5] is provided.

The hand-cutting imparting base material of the present invention can be easily cut by hand along the weft direction without performing special processing, and can suppress the generation of whiskers. It can use suitably for the use of.
In addition, the hand-cutting imparted base material of the present invention, which is formed by further laminating at least one of polyolefin resin, polyolefin foam, polyurethane foam, metal foil, paper, etc., is easy while suppressing the generation of whiskers along the weft direction. Can be cut by hand.
Further, the pressure-sensitive adhesive tape of the present invention can be easily cut by hand, and the generation of whiskers can be suppressed, so that the work of beard treatment is unnecessary, and the workability such as packing is excellent.

The hand-cutting imparting substrate of the present invention is obtained by arranging synthetic fibers on warps and wefts.
The warp is made of a cationic yarn having an elongation of less than 30%. Examples of the cationic yarn include synthetic fibers that can be dyed with a cationic dye.

  Specific examples include polyester yarn that can be dyed with a cationic dye. The polyester yarn that can be dyed with the cationic dye is preferably a polyester yarn that can be dyed with the cationic dye under normal pressure.

  The polyester yarn that can be dyed with a cationic dye under normal pressure is obtained by polymerizing the aromatic dicarboxylic acid of the whole polyester with a metal sulfonate group-containing isophthalic acid and a polyalkylene glycol such as diethylene glycol. be able to.

  The warp yarn used in the present invention is preferably a normal pressure cationic dyeable polyester yarn having an elongation of less than 30% and a strength of 0.04 N or less based on 1 dtex.

The warp having a strength of 0.04 N or less and an elongation of less than 30% is, for example, in the range of 0.1 to 10 mol% of the content of metal sulfonate group-containing isophthalic acid relative to the aromatic dicarboxylic acid of the entire polyester. It can be obtained by means of using a certain polyester and adjusting the draw ratio when drawing an undrawn yarn.
The warp strength is preferably in the range of 0.001 to 0.04 N based on 1 dtex, and more preferably in the range of 0.01 to 0.038 N.

  When the strength of the warp exceeds 0.04 N, it may be difficult to cut the obtained hand-cutting imparted base material by hand. Moreover, when the strength of the warp is less than 0.001 N, the hand cutting imparting base material may break during use.

  The warp yarn elongation is preferably in the range of 0.01 to 30%, more preferably in the range of 0.1 to 20%, and even more preferably in the range of 1 to 15%.

  When the warp elongation is 30% or more, a problem of whiskers occurs when the hand-cutting substrate is cut by hand. Moreover, when the elongation of the warp is less than 0.01%, the hand-cutting imparting base material may break during use.

  The base material used in the present invention preferably has a warp density in the range of 40 to 70 per inch. If the warp density is less than 40, the strength of the base material may decrease. If the warp density exceeds 70, the problem of whiskers occurs when the hand-cutting imparted base material is cut by hand. There is a case.

  Synthetic fibers are used for the wefts. As the synthetic fibers, for example, suf fibers, polyolefin fibers, polyester fibers, polyamide fibers, polyacryl fibers, etc. can be used. Therefore, polyolefin fiber, polyester fiber, polyamide fiber, polyacrylic fiber and the like are preferable.

  The weft strength is preferably in the range of 0.039 to 0.20 N based on 1 dtex, and more preferably in the range of 0.039 to 0.10 N.

  When the strength of the weft is less than 0.039N, it may be difficult to cut along the weft.

  The base material used in the present invention preferably has a weft density in the range of 5 to 100 per inch. When the number of wefts is less than 5, the strength of the base material may decrease. When the number of the wefts exceeds 100, the thickness in the warp direction and the thickness in the weft direction of the base material to be obtained are different. May cause problems with sex.

  The tear strength in the warp direction relative to the substrate is preferably 1.2 times or more of the tear strength in the weft direction, more preferably in the range of 1.2 to 100 times, and in the range of 2 to 20 times. More preferably.

  When the strength of the weft is less than 1.2 times that of the warp, it may not be easy to cut the hand-cutting substrate along the weft. May be difficult.

  The warp yarn and the weft yarn can use false twisted synthetic fiber, flat yarn or the like, but the warp yarn preferably uses a flat yarn.

  Next, as a method for producing the hand-cut property imparting substrate of the present invention, for example, weaving or the like is performed by a conventional method using the warp and the weft. The loom used at this time preferably employs a water jet loom. When laminating with polyolefin resin, etc., if the residual amount of raw yarn oil is large, the strength of the hand-cutting material may be reduced, but if weaving in a water jet loom, the residual amount of oil will be reduced. And strength reduction can be prevented.

  A rapier loom or an air jet loom can be used for the weaving, but it is preferable to perform sufficient refining before lamination.

  The hand cutting imparting base material obtained by weaving the warp and the weft may be obtained by laminating a polyolefin resin, a polyolefin foam, a polyurethane foam, a metal foil, paper or the like.

Examples of the polyolefin resin include polyethylene, polypropylene, and polybutadiene.
Examples of the polyolefin foam include a polyethylene foam, a polypropylene foam, and a polybutadiene foam.
Examples of the polyurethane foam include urethane foam.

  In addition, examples of the metal foil include copper stays and aluminum foil.

  When laminating the warp and weft woven with the polyolefin resin, polyolefin foam, polyurethane foam and the like, for example, a method of applying the melted polyolefin resin, polyolefin foam, polyurethane foam, A method of hot pressing a sheet of the polyolefin resin, polyolefin foam, polyurethane foam or the like can be employed.

  In addition, when laminating the woven warp and the weft with a metal foil, paper, or the like, a method of attaching using an adhesive or an adhesive can be employed.

  In this way, the hand cutting ability-imparting substrate of the present invention is obtained.

Moreover, an adhesive tape is obtained by providing an adhesive layer on at least one surface of the hand-cutting imparting substrate.
As the pressure-sensitive adhesive used in the present invention, for example, a rubber-based pressure-sensitive adhesive or an acrylic pressure-sensitive adhesive is used.

  Examples of the rubber-based pressure-sensitive adhesive include natural rubber such as butyl rubber, synthetic rubber such as SIS, SBR, SBS, and IR, and elastomer such as recycled rubber, rosin or a modified product thereof, rosin ester, terpene, terpene phenol, and aromatic. Natural products oligomers such as hydrocarbons, modified terpenes, petroleum resins, coumarone / indene resins, synthetic resins such as styrene resins, phenolic resins, xylene resins, petroleum softeners, liquid rubbers, vegetable oils, dibasic ester plasticizers , Fillers, anti-aging agents and the like are appropriately blended and used.

  Examples of the acrylic pressure-sensitive adhesive include an acrylic system obtained by copolymerizing various (meth) acrylic acid esters with monomers such as vinyl acetate, acrylonitrile, and MMA, and functional group-containing monomers such as (meth) acrylic acid and hydroxyacrylate. A copolymer is used.

  These pressure-sensitive adhesives may be directly applied and laminated on the synthetic resin film after being melted by heat or dissolved in a solvent, or may be laminated on the synthetic resin film by a transfer method.

  In the present invention, usually, the adhesive strength and the like of the pressure-sensitive adhesive layer are appropriately set so that the interlayer strength is higher than the adhesive strength between the synthetic resin film and the pressure-sensitive adhesive layer.

  Further, the thickness of the pressure-sensitive adhesive is not particularly limited, but it is preferably in the range of high glue thickness, for example, 50 to 100 μm so that it can withstand heavy packaging.

  In this way, the pressure-sensitive adhesive tape of the present invention can be obtained.

  EXAMPLES Next, although this invention is demonstrated further in detail based on an Example, this invention is not limited at all by these Examples.

[Manufacture of hand cut substrate 1 (base fabric)]
Using a warp with a yarn thickness of 56 dtex and a yarn strength of 1.5 N, and a weft with a yarn thickness of 267 dtex and a yarn strength of 10.6 N, the warp density is 49 and the weft density is 1 inch. A base fabric was obtained by weaving the warp and the weft so as to be 18 at right angles to each other.
The warp used was a polyester yarn that could be dyed with a cationic dye under normal pressure, and its elongation was less than 30%.
The base fabric obtained in Example 1 could be easily cut by hand along the weft method, but could not be cut by hand in the warp direction.
The tear strength (tear strength) and elongation were measured according to JIS-L1096. The same applies hereinafter.

[Manufacture of hand-cut substrate 2 (polyethylene laminate)]
A low-density polyethylene having a melt index of 4.0 was melt-pressed and laminated on one surface of the base fabric to obtain a polyethylene laminate.
The polyethylene laminate obtained in Example 1 could be easily cut by hand along the weft method, but could not be cut by hand in the warp direction.

[Manufacture of adhesive tape 3 (double-sided adhesive tape)]
A double-sided pressure-sensitive adhesive tape was obtained by applying 30 g (dry weight) per square meter of the base fabric with a strong adhesive acrylic adhesive on both sides of the base fabric.
The double-sided pressure-sensitive adhesive tape obtained in Example 1 could be easily cut by hand along the weft method, but could not be cut by hand in the warp direction.

[Manufacture of adhesive tape 4 (packing cloth adhesive tape)]
A packing rubber adhesive tape was obtained by applying 50 g (dry weight) of the rubber adhesive for packing to the polyethylene laminate described in Example 1 per square meter of the polyethylene laminate.
The cloth adhesive tape for packing obtained in Example 2 could be easily cut by hand along the weft method, but could not be cut by hand in the warp direction.

[Manufacture of adhesive tape 5 (cured adhesive tape)]
A curing adhesive tape was obtained by applying 40 g (dry weight) of acrylic adhesive for curing to the polyethylene laminate described in Example 1 per square meter of the polyethylene laminate.
The cured adhesive tape obtained in Example 3 could be easily cut by hand along the weft method, but could not be cut by hand in the warp direction.

[Comparative Example 1]
[Manufacture of hand cut substrate 6 (comparative base fabric)]
Using a warp different from a cationic yarn having a yarn thickness of 66 dtex and yarn strength of 2.8 N, and a weft having a yarn thickness of 94 dtex and yarn strength of 3.7 N, the warp density is 50 per inch. A comparative base fabric was obtained by weaving the warp yarn and the weft yarn so that the weft density was 40.

[Manufacture of hand cut substrate 7 (comparative polyethylene laminate)]
A comparative polyethylene laminate was obtained by laminating and laminating low density polyethylene having a melt index of 4.0 on one surface of the comparative base fabric.

[Manufacture of adhesive tape 8 (comparative double-sided adhesive tape)]
A comparative double-sided pressure-sensitive adhesive tape was obtained by applying 30 g (dry weight) per square meter of the base fabric on both sides of the comparative base fabric.

[Comparative Example 2]
[Manufacture of hand cut substrate 9 (comparative base fabric)]
The same comparative base fabric as Comparative Example 1 was obtained in the same manner as in Comparative Example 1.

[Manufacture of hand cut substrate 10 (comparative polyethylene laminate)]
The same comparative polyethylene laminate as Comparative Example 1 was obtained in the same manner as in Comparative Example 1.

[Manufacture of adhesive tape 11 (cloth adhesive tape for comparative packaging)]
By applying 50 g (dry weight) of the rubber adhesive for packing to the comparative polyethylene laminate described in Comparative Example 2 per square meter of the comparative polyethylene laminate, a cloth adhesive tape for comparative packing was obtained.

[Comparative Example 3]
[Manufacture of hand cut substrate 12 (comparative base fabric)]
Using a warp different from a cationic yarn with a yarn thickness of 56 dtex and yarn strength of 1.2 N, and a weft with a yarn thickness of 167 dtex and yarn strength of 5.3 N, the warp density per inch is 55 A comparative base fabric was obtained by weaving the warp and the weft so that the weft density was 19, so that they were orthogonal to each other.

[Manufacture of hand cut substrate 13 (comparative polyethylene laminate)]
A comparative polyethylene laminate was obtained by laminating 30 g per square meter of low density polyethylene having a melt index of 7.0 on both sides of the comparative base fabric.

[Manufacture of adhesive tape 14 (comparative curing adhesive tape)]
A comparative curing adhesive tape was obtained by applying 40 g (dry weight) of an acrylic adhesive for curing to the polyethylene laminate described in Comparative Example 3 per square meter of the polyethylene laminate.

[Beard generation confirmation test]
For each of Examples 1 to 3 and Comparative Examples 1 to 3, each sample was cut by hand 20 times continuously every 5 cm, and the number of times the beard was generated was measured. The results are shown in Table 1.

  The hand-cutting imparting substrate and the adhesive tape of the present invention have good hand-cutting properties, and when the hand-cutting imparting substrate or the adhesive tape is cut along the weft direction, the problem of whiskers does not occur, and handling Especially excellent in properties.

Claims (6)

  A base material in which synthetic fibers are arranged on the warp and the weft, the tear strength in the warp direction with respect to the base material being greater than the tear strength in the weft direction, and the warp comprising a cationic yarn having an elongation of less than 30% A base material for imparting hand cutting properties. The warp yarn is a normal pressure cationic dyeable polyester yarn having a strength of 0.04 N or less based on 1 dtex,
The warp density imparting substrate according to claim 1, wherein the warp density of the substrate is in the range of 40 to 70 per inch.   The tearability imparting substrate according to claim 1 or 2, wherein the tear strength in the warp direction relative to the substrate is 1.2 times or more of the tear strength in the weft direction.   The at least one surface of the said base material laminates | stacks at least 1 chosen from the group which consists of polyolefin resin, polyolefin foam, a polyurethane foam, metal foil, and paper in any one of Claims 1-3. Hand cutting imparting base material.   The tearability imparting substrate according to any one of claims 1 to 4, wherein a tear strength in the weft direction relative to the substrate is 1.2 N or less.   The adhesive tape which has an adhesive layer in the at least one surface of the hand-cut property provision base material in any one of Claims 1-5.