JPH0342316B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to polyester fibers for warp of adhesive tape base fabric. More specifically, the present invention relates to polyester fibers for the warp of adhesive tape base fabrics widely used for various adhesives such as packaging materials. Conventional technology The warp fibers of conventional adhesive tape base fabrics include:
Spun yarn made of rayon cotton or vinylon fiber was used. However, with the former, the strength when wet is reduced to 45-55% compared to when dry, the base fabric has uneven thickness, the surface is not flat, and the amount of adhesive resin tends to be excessive. There were many shortcomings such as: In addition, the latter has drawbacks such as expensive materials, complicated manufacturing processes, and a drop in wet strength of 70 to 80%. In order to solve these shortcomings, we used untwisted multifilament with a denier of 40 denier or less as the warp, and used a low shrinkage untwisted multifilament with a denier more than twice that of the warp as the weft, and the weft density was 7 threads/cm.
An adhesive tape base fabric made of the above-mentioned polyester fiber fabric has been developed (see Japanese Utility Model Application Publication No. 71570/1983). This base fabric has warp yarns with a denier of 40 deniers or less to make the warp strength of the adhesive tape easy to cut, and the use of non-twisted yarns makes it easy to sequentially cut the warp yarns. However, it has drawbacks such as uneven thickness of the base fabric, uneven surface, and unavoidable adhesive spots. In addition, a base material for cloth adhesive tape was developed in which the thickness of the warp was less than 0.3 mm and the thickness of the weft was 0.3 mm or more.
-Refer to Publication No. 58067). However, although this base material has reduced strength in the warp direction to the extent that it can be torn, it has an elongation in the warp direction of 49 to 62%, and materials with such elongation are difficult to cut. This will cause fraying and the cut will not be beautiful.
It also has the same drawbacks as those in the above-mentioned Japanese Utility Model Publication No. 50-71570. Furthermore, in the prior art, sizing is generally performed regardless of whether untwisted yarn or twisted yarn is used. If the fiber is subjected to a scouring process after fiber formation, the fibers will become loose, so the scouring process is usually omitted and resin processing is performed instead. As a result, the peel strength between the resin and the base fabric decreases due to the influence of the residual adhesive. As a result, the adhesive tape has disadvantages in that it is difficult to cut by hand and the cut is complicated and unsightly. Purpose of the Invention The present invention was made to improve the drawbacks of conventional adhesive tape base fabrics.The purpose of the present invention is to enable fiber production without twisting or glue, and to reduce the adhesive strength between the resin and the base fabric even when wet. To provide a polyester fiber for the warp of an adhesive tape base fabric, which is free from the adhesive tape, has good manual tearability, and has a beautiful cut surface. Composition of the Invention As a result of intensive research to achieve the above object, the present inventors have found that the above object can be achieved by using polyester fibers of a specific composition as polyester fibers for the warp of the adhesive tape base fabric and weaving without twisting and without glue. We have found that an adhesive tape with such characteristics can be obtained.
The present invention was completed based on this knowledge. The gist of the present invention is to copolymerize 1 to 15 mol% of a bifunctional compound having a -SO ₃ M group (M represents hydrogen or a metal ion), or to make polyester fibers with a monofilament fineness of the fibers. is 1~5 denier, total fineness is 30~
125 denier, strength is 2.5 g/denier or more, apparent elongation is 27% or less, strength x √ elongation satisfies the following range, and the degree of entanglement is 20 or more pieces/m. Polyester fiber for the warp of the adhesive tape base fabric. It is 10 strength x √ elongation 26. Examples of the bifunctional compound having _-SO3M (M represents hydrogen or a metal ion, the same applies hereinafter) used in the present invention include _-SO3M group-containing dicarboxylic acid diols and oxyacids. When M in the _-SO3M group is a metal, examples of the metal include Li ⁺ , Na ⁺ , Mg ⁺⁺ , Ca ⁺⁺ , Cu ⁺⁺ , Fe ⁺⁺ and Fe ⁺⁺⁺ . Among them, Na ⁺ , Li ⁺
is preferred. Examples of compounds in which the _-SO4M group is directly bonded to an aromatic nucleus include compounds represented by the following general formula. (1) General formula (In the formula, X is a trivalent aromatic hydrocarbon group, Y is 2
valent aromatic hydrocarbon group, R is hydrogen or carbon number 1
~4 alkyl group, M is hydrogen, Li, Na, K,
Metals such as Mg, Ca, Fe, etc., a represents 1.2 or 3. ) (2) General formula (In the formula, R is hydrogen, an alkyl group having 1 to 8 carbon atoms, or a phenyl group, M is Na, Li, K, Mg,
Metals such as Ca, Cu, Fe, etc., a represents 1, 2, or 3. ). Specifically, sulfoisophthalic acid, sulfoterephthalic acid, sulfophthalic acid or 4-sulfonaphthalene2.7
Metal salt of dicarboxylic acid, 4-sodiosulfenyl-3-5-dicarbomethoxybenzenesulfonate, 4-lithiosulfophenyl 3,5-dicarbomethoxybenzenesulfonate, 6-sodiosulfo-2-naphthyl 3,5- Dicarbomethoxybenzenesulfonate, 5-[4-(sodiosulfo)
-Phenoxy]dimethyl isophthalate, 5-
[(Sodiosulfo)phenoxy] Dimethyl terephthalate and 5-[4.(Sodiosulfo)phenoxy]
Examples include isophthalic acid. Among them, Na
Particularly preferred is metal-bound sodiosulfoisophthalic acid. The action of the difunctional compound having the -SO ₃ M group is to reduce the degree of orientation of the polyester fibers, thereby reducing their strength or elongation or both. Further, the copolymerization ratio of the compound is preferably 1 to 15 mol%.
If it is less than 1 mol %, the strength x √ elongation will exceed 26, making it difficult to cut the adhesive tape and causing fraying at the cut end after tearing. Moreover, if it exceeds 15 mol%, the strength will be
√The elongation is less than 10, resulting in the disadvantage of thread breakage during warping and weaving. The unit fineness of the polyester fiber is preferably in the range of 1 to 5 deniers. If it is less than 1 denier, fuzz will easily occur during the interlacing process,
If it exceeds 5 denier, the entangling properties will be lowered during the entangling treatment, resulting in the disadvantage that the fiber formation will not proceed smoothly and the tearability will be lowered. The total fineness is preferably in the range of 30 to 125 deniers. If it is less than 30 denier, the warp density should be 40 to 70.
The strength of the woven fabric is too low to be used as a base fabric for adhesive tapes when measured in terms of woven fabric per inch. On the other hand, if it exceeds 125 denier, the tearing strength will be too high, which is undesirable. A particularly preferred range is 50 to 80 deniers. The strength is preferably 2.5 g/denier or more. If it is less than 2.5 g/denier, fuzz will occur during interlacing treatment or single yarn breakage will occur. Although the strength depends on the elongation, it is most preferably 3.5 to 5.0 g/denier. The apparent elongation is preferably 27% or less.
If it exceeds 27%, the tearing strength increases and there is a disadvantage that the tearability becomes poor. The number of interlaced interlaces must be 20 pieces/m or more. If the number of intertwined pieces is small, sufficient binding properties cannot be obtained, making it difficult to weave without twisting or gluing. Note that the interlacing process referred to in the present invention refers to an interlacing process. Since the entangled polyester multifilament has a large number of intertwined points (knot points), its apparent elongation decreases. For example, 50 interlaced/
In the case of m, the apparent elongation decreases by about 5%. When an adhesive tape is made by coating a resin on a fabric using warp threads whose apparent elongation has been reduced by about 5% due to entanglement treatment, the tear strength is reduced by about 50%. On the other hand, the decrease in tensile strength in the warp direction is only about 10%.
Holds virtually enough strength. As a result, the adhesive tape has good manual tearability and a beautiful cut. When polyester fibers meeting the above specific requirements are used as the warp of the adhesive tape base fabric, it can be used substantially without twisting or gluing, thereby eliminating the drawbacks of conventional products. There are no particular restrictions on the weft yarns of the base fabric, but like the warp yarns, it is preferable that they be non-twisted yarns and have a higher strength than the warp yarns in terms of easy tearability by hand and good cut properties. Examples and Comparative Examples Polyester multifilaments of various finenesses were prepared by copolymerizing sodiosulfoisophthalic acid, and interlace processing was performed under normal conditions. Next, the multifilament is used as a warp,
Polyester multifilament with a total fineness of 100 denier and 48 filaments (strength 5.2 g/denier,
The weave density is 50 in the warp direction.
It was woven at 45 threads/inch in the weft direction. Using this as a base fabric, a 60 micron thick polyethylene film was melt-extruded and laminated on the front side of the base fabric. Furthermore, a release agent is applied to the front side of the laminated base fabric.
An adhesive tape was created by applying an acrylic acid adhesive to the back side. The evaluation results of the hand cutability and cut surface were as shown in the table below.

【table】

[Table] As shown by this result, the polyester fiber is made of polyester fiber copolymerized with 1 to 15 mol% of a bifunctional compound having -SO ₃ M group, which is an essential requirement for the warp polyester fiber of the present invention, and the single yarn fineness is 1 to 5 denier, total fineness of 30 to 125 denier, strength of 2.5 g/denier or more, strength x √ elongation of 10 to 26, and apparent elongation of 27 after being entangled with a degree of entanglement of 20 pieces/m or more.
% or less, it has excellent hand-cutting properties and a beautiful cut. However, it can be seen that if even one of these conditions is lacking, the above properties deteriorate. Effects of the Invention The polyester fiber for the warp of the adhesive tape base fabric of the present invention has the following excellent effects. (1) By using this as a warp, it is possible to weave with virtually no twist or glue, without impairing weavability, and the gluing process can be omitted, resulting in higher performance and thinner base fabrics than conventional products. It can be done. (2) Since it is woven with a sizing agent, the sizing agent does not remain on the base fabric, so there is no decrease in the adhesive strength between the resin and the base fabric, and the same effect can be obtained even when wet. (3) The adhesive tape has good hand-tearability and the cut surface is beautiful.

Claims (1)

[Claims] A bifunctional compound having 1 -SO ₃ M group (where M represents hydrogen or a metal ion)
Consisting of polyester fibers copolymerized in mol%, the single fiber fineness of the fibers is 1 to 5 deniers, and the total fineness is 30 to 30.
125 denier, strength is 2.5 g/denier or more, apparent elongation is 27% or less, strength x √ elongation satisfies the following range, and the degree of entanglement is 20 or more pieces/m. Polyester fiber for the warp of the adhesive tape base fabric. 10 strength x √ elongation 26 2 -SO ₃ M group (M represents the same as above)
The polyester fiber for warp of an adhesive tape base fabric according to claim 1, wherein the difunctional compound having the following is sodiosulfoisophthalic acid.