JP2000230157A - Stretchable adhesive tape or sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a stretchable tape or sheet which can be used for medical treatment uses, sports uses, chiropractic uses, beauty uses (body shape-reinforcing or correcting uses), and the like, and simultaneously has proper skin adhesivity, low skin irritability and proper readhesivity. SOLUTION: This stretchable tape or sheet is obtained by forming a cross- linked adhesive layer having a gel fraction of 15-80 wt.% on one surface of a stretchable substrate. The adhesive layer is preferably obtained by adding 30-100 pts.wt. of an esterification product to 100 pts.wt. of an acrylic polymer and then chemically crosslinking the mixture with a multi-functional isocyanate compound, a metal alcoholate or metal chelate. An esterification product of a branched alcohol with a monobasic or a polybasic acid having a specific carbon number or an esterification product of a tetrahydric or lower alcohol with an unsaturated fatty acid or unsaturated branched acid having a specific carbon number is used as the estrification product. The obtained stretchable tape or sheet is adjusted to have an elongation of >=40% and a tensile strength of <=0.5 kg/10 mm under an elongation of 40%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stretchable pressure-sensitive adhesive tape or sheet which can be used in the medical field, sports field, beauty field, etc., and more particularly for medical uses, sports uses, manipulative uses, and body shape reinforcement / correction uses. The present invention relates to an elastic pressure-sensitive adhesive tape or sheet that is used by sticking to the skin for use.

[0002]

2. Description of the Related Art Adhesive tapes or sheets for application to the skin (hereinafter sometimes referred to as adhesive tapes) used in the above technical field are broadly classified as substrates and have elasticity. Some do not have. Of these, adhesive tapes using a stretchable base material appropriately expand and contract following the movement of the attached skin surface, so that the skin adhesive strength of the adhesive layer formed on the base material is normal. It needs to be larger than the one.

However, conventional elastic adhesive tapes have a strong skin adhesive force for the purpose of securely adhering to the skin surface, and as a result, may damage the skin surface or peel off from the skin surface. When removing, there is a possibility that the stratum corneum on the skin surface may be damaged or damaged.

[0004] Since the condition of human skin varies depending on various factors such as age, gender, race, health condition, constitution, etc., adhesive tapes maintaining good properties on all skin surfaces are provided. It is very difficult. Therefore, it is ideal to provide adhesive tapes for each purpose and application.

It is natural that adhesive tapes to be applied to the skin surface have an appropriate skin adhesive strength, but as described above, it is also an important required characteristic to prevent irritation to the skin surface. In particular, it is required for people with weak skin such as infants and the elderly to reduce skin damage such as skin irritation. Also, prolonged application of the skin may cause itching and sometimes inflammation. Therefore, in the case of the pressure-sensitive adhesive tapes for sticking to the skin as in the present invention, particularly in the case of stretchable pressure-sensitive adhesive tapes, it is necessary to adjust the balance between skin hypoallergenicity and adhesiveness.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and the stress (tensile strength) applied during stretching as a base material used for elastic adhesive tapes is compared. Adhesive strength to the skin (skin fixability) by using a specific gel-like cross-linking adhesive as a pressure-sensitive adhesive for applying to the skin that forms a pressure-sensitive adhesive layer formed on one surface of the base material It has been found that a stretchable pressure-sensitive adhesive tape or sheet that can be used for relatively many purposes, which can reduce irritation to the skin while maintaining the above, can be obtained, and have completed the present invention.

[0007]

That is, according to the present invention, a cross-linked pressure-sensitive adhesive layer having a gel fraction of 15 to 80% by weight is formed on one surface of a stretchable base material. A stretchable pressure-sensitive adhesive tape or sheet having a tensile strength at the time of 40% elongation of 0.5 kg / 10 mm or less, wherein the crosslinked pressure-sensitive adhesive layer has 100 parts by weight of an acrylic polymer and 8 carbon atoms.
And / or an esterified product of a monobasic acid or polybasic acid with a branched alcohol having 14 to 20 carbon atoms and / or an unsaturated fatty acid or an unsaturated branched acid having 14 to 20 carbon atoms with an alcohol having a valency of 4 or less. The present invention provides a stretchable pressure-sensitive adhesive tape or sheet comprising 30 to 100 parts by weight of a compound and having been subjected to a crosslinking treatment.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The stretchable pressure-sensitive adhesive tape or sheet of the present invention is obtained by forming a crosslinkable pressure-sensitive adhesive layer having a specific gel fraction on one side of a stretchable base material. Means that the elongation of the finally obtained adhesive tapes is 40%
And the tensile strength at 40% elongation is 0.5 kg
If it is / 10 mm or less, the material is not particularly limited. As a substrate that can be specifically used, for example, polyethylene, ethylene / vinyl acetate copolymer, ethylene / (meth) acrylate copolymer,
Polyethylene / polybutene-1 mixture, polyethylene /
Polyethylene resin such as polystyrene mixture, polypropylene resin such as polypropylene, propylene / ethylene copolymer, polypropylene / styrene-isoprene-styrene copolymer mixture, olefin resin obtained by blending a rubber component with each of the above resins, polyurethane resin , A film or sheet made of polyester resin, etc.,
Woven fabrics, non-woven fabrics, knitted fabrics, cotton woven fabrics, non-woven fabrics,
Examples thereof include knitted fabrics and fabrics containing an elastic core. Among these, it is preferable to use cloths having an elastic core from the viewpoint of handleability and usability.

When the stretchable substrate is not a cloth but a plastic film or a sheet, its thickness is set to 3 to 30 μm, preferably about 5 to 20 μm, such as a woven cloth, a nonwoven cloth or a knitted cloth. In the case of fabric, the basis weight is 1
0 to 500 g / m ² , preferably 50 to 200 g / m ²
About.

The acrylic polymer used in the crosslinked pressure-sensitive adhesive layer of the stretchable pressure-sensitive adhesive tape or sheet of the present invention has 15 to 80% by weight, preferably 35 to 65% by weight, insolubilized by a crosslinking treatment described later. Further, even when a relatively large amount of an esterified product described later is contained, the cohesive strength is not reduced, and the composition is adjusted so as to maintain appropriate skin adhesion.

As such an acrylic polymer, those having an alkyl (meth) acrylate as a main component are preferable from the viewpoint of ensuring adhesiveness to the skin surface, and if necessary, a copolymerizable monomer is used in an amount of from 30 to 90. A copolymer obtained by copolymerizing by weight, preferably 50 to 80% by weight can be used.

As the alkyl (meth) acrylate, the alkyl group has 2 to 18 carbon atoms, preferably 4 to 4 carbon atoms.
Preferred are 15 (meth) acrylic acid alkyl esters, specifically, (meth) acrylic acid ethyl ester,
One or more of propyl ester, butyl ester, pentyl ester, hexyl ester, heptyl ester, octyl ester, nonyl ester, decyl ester, dodecyl ester, undecyl ester, tridecyl ester and the like can be used. These esters may be linear or branched.

The copolymerizable monomers include carboxyl group-containing monomers such as acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic acid, and maleic anhydride; styrenesulfonic acid, allylsulfonic acid, and sulfopropyl ( Sulfonic acid group-containing monomers such as (meth) acrylate, (meth) acryloyloxynaphthalenesulfonic acid, and acrylamidomethylpropanesulfonic acid;
Hydroxyl group-containing monomers such as hydroxyethyl (meth) acrylate and hydroxypropyl (meth) acrylate, (meth) acrylamide, dimethyl (meth)
Acrylamide, N-butyl (meth) acrylamide,
Amide group-containing monomers such as N-methylol (meth) acrylamide and N-methylolpropane (meth) acrylamide; and amino acids such as aminoethyl (meth) acrylate, dimethylaminoethyl (meth) acrylate and tert-butylaminoethyl (meth) acrylate Group-containing monomer, alkoxyalkyl group-containing monomer such as methoxyethyl (meth) acrylate, ethoxyethyl (meth) acrylate, methoxyethylene glycol (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, methoxydiethylene glycol (meth) acrylate, methoxypolyethylene Glycol (meth) acrylate, methoxypolypropylene glycol (meth) acrylate and other alkoxyl group-containing monomers, (meth) acrylic Nitriles, vinyl acetate, vinyl propionate, can be used such as the one or two or more vinyl monomers such as vinyl pyrrolidone.
Among them, it is preferable to use a monomer containing a carboxyl group-containing monomer or a hydroxyl group-containing monomer, a monomer containing an alkoxyl group or an ether group from the viewpoint of easy adjustment of a crosslinking point and adjustment of an adhesive property at the time of a crosslinking treatment. .

In the present invention, the acrylic polymer obtained from the above monomer is subjected to a crosslinking treatment. The cross-linking treatment includes chemical cross-linking using a cross-linking agent such as an organic peroxide, an isocyanate compound, an organic metal salt, a metal alcoholate, a metal chelate, an epoxy compound, or a primary amino compound, or physical irradiation with ionizing radiation. It is possible to carry out chemical cross-linking, and among these, from the viewpoint of ease of adjustment of the degree of cross-linking, ease of compounding, and pot life, a chemical cross-linking treatment using a polyfunctional isocyanate, metal chelate, or metal alcoholate is performed. Is preferred.

On the other hand, the esterified product contained in the pressure-sensitive adhesive layer together with the acrylic polymer is preferably a compound having 8 to 20 carbon atoms.
Esterified product of a monobasic acid or polybasic acid and a branched alcohol having 14 to 20 carbon atoms, and / or 14 carbon atoms
Esterified product of an unsaturated fatty acid or unsaturated branched acid of 20 to 20 and an alcohol having a valency of 4 or less is used.

The former esterified compound having 8 to 2 carbon atoms
An esterified product of 0 monobasic acid or polybasic acid and a branched alcohol having 14 to 20 carbon atoms is a component that uniformly dissolves in the pressure-sensitive adhesive layer and improves wettability in which the pressure-sensitive adhesive layer adheres to an adherend. is there. If the number of carbons is outside the above range, not only the above-mentioned effects of the esterified product cannot be sufficiently exerted, but also the compatibility with the acrylic polymer becomes poor, and a blooming phenomenon may occur.

As the former esterified product,
Specifically, isostearyl laurate, isocetyl myristate, octyldodecyl myristate, isostearyl palmitate, isocetyl stearate, octyldodecyl oleate, diisostearyl adipate, diisocetyl sebacate, trioleyl trimellitate,
One or two or more triisocetyl trimellitates can be blended.

Further, the latter esterified product of an unsaturated fatty acid or unsaturated branched acid having 14 to 20 carbon atoms and an alcohol having a valency of 4 or less as an esterified product is uniformly dissolved in the pressure-sensitive adhesive layer, and It is a component that improves the adhesion to an adherend. When the number of carbons is outside the above range, not only the above-mentioned action by the esterified product cannot be sufficiently exhibited, but also
The compatibility with the acrylic polymer is deteriorated, and a blooming phenomenon may occur.

As the latter esterified product,
Specifically, unsaturated fatty acids or unsaturated branched acids such as myristoleic acid, oleic acid, linoleic acid, linolenic acid, isopalmitic acid, isostearic acid, ethylene glycol, propylene glycol, glycerin, trimethylolpropane, pentaerythritol , Or one or two or more esterified compounds composed of an alcohol having a valency of 4 or less such as sorbitan.

The above-mentioned two types of esterified products are used alone or in combination with each other in the crosslinked acrylic polymer. The compounding amount is based on 100 parts by weight of the acrylic polymer and the total amount of the esterified product. Is 30-1
The amount is adjusted so as to be 00 parts by weight, preferably 30 to 80 parts by weight. When the amount of the esterified compound is less than 30% by weight, the wettability of the pressure-sensitive adhesive layer with respect to the adherend may be insufficient. It is not preferable because the agent layer may bloom.

Since the esterified product has an unsaturated bond, it may be oxidized and degraded by oxygen in the atmosphere to cause a change in physical properties, thereby failing to exhibit desired characteristics. It is preferable that an antioxidant is incorporated in the pressure-sensitive adhesive layer.

The stretchable pressure-sensitive adhesive tape or sheet of the present invention can be obtained by providing a crosslinked pressure-sensitive adhesive layer containing the above components on one surface of a stretchable base material. It can also be used by placing a sex pad. In this case, the pressure-sensitive adhesive layer used in the present invention is slightly inferior in adhesiveness as compared with the conventional one and has a moderate cohesive force but is very soft, so that the skin adhesiveness by the pressure-sensitive adhesive layer is practical. In order to maintain the level at which there is no problem, it is preferable that the size of the exposed pressure-sensitive adhesive layer when the liquid-absorbent pad is placed is set to a specific value or more. Specifically, the liquid-absorbent pad placed on the pressure-sensitive adhesive layer has a length of 10 mm or more at least at two locations (two sides) facing each other.
It is desirable that the adhesive layer be placed at the center of the adhesive layer so that the adhesive layer is exposed with a width of 20 mm or more. 10
If the thickness is less than mm, the adhesiveness (fixability) of the skin due to the exposed pressure-sensitive adhesive layer may not be sufficient, and the edge may peel off or fall off during use.

As the material of the liquid-absorbent pad, there can be used cotton, rayon, rayon acrylic fiber, cellulose rayon, rayon polyester, polyurethane non-woven fabric and the like, which are used for so-called emergency bandages. Can be freely selected.

In the above-mentioned elastic pressure-sensitive adhesive tape or sheet, the surface of the liquid-absorbent pad and the exposed pressure-sensitive adhesive layer are covered and protected until the elastic pressure-sensitive adhesive tape or sheet is used so as to cover and protect the surface. It is preferable to cover and temporarily attach a separator which has been subjected to a release treatment such as silicone treatment or fluorine treatment. Furthermore, when used for medical applications, it is preferable to perform a sterilization treatment such as ethylene oxide gas (EOG) sterilization or γ-ray sterilization.

[0025]

As described above, the stretchable pressure-sensitive adhesive tape or sheet of the present invention is low in terms of skin adhesive strength as compared with conventionally used pressure-sensitive adhesives, but is appropriately softly cross-linked. Adhesive that compensates for internal cohesion due to its adhesiveness (wetness) along irregularities on the skin surface
It exhibits excellent practical skin adhesion, and does not cause keratin damage at the time of peeling-off, so that damage to the skin surface is extremely small.

Furthermore, since a stretchable base material is used, if a shrinkage stress is applied to the pressure-sensitive adhesive layer during use, it causes irritation to the skin and detachment from the skin surface. In addition, since a gel-like soft cross-linking pressure-sensitive adhesive is used, it has an action of alleviating this contraction stress. Further, when an excessively large contraction stress that causes skin irritation is applied, the tape naturally peels off from the skin surface and does not damage the skin surface. Even if such a peeling-off phenomenon occurs, the adhesive used in the present invention is a gel-like adhesive, so that once peeled, it can be re-applied while maintaining substantially the same skin adhesive strength. Having. Therefore, in such a case, the tape may be extended and re-applied to such an extent that the tape does not fall off.

As described above, since the stretchable pressure-sensitive adhesive tape or sheet of the present invention comprises a stretchable base material having specific physical properties and a specific crosslinked pressure-sensitive adhesive, skin adhesion and skin irritation The balance of reduction is achieved. Therefore, in medical applications, as adhesive tapes for fixing gauze, catheters, etc., and for pressing moderately, in sports and manipulative applications, as tapes used for fixing, protecting, treating and treating affected parts, In reinforcement / correction applications, it is useful as a large area adhesive tape that can apply a uniform load without impairing the movement of the body as a substitute for a girdle or a corset without impairing the body movement. Also, temporarily reinforce parts of the body such as face, neck, arms, chest, belly, thighs, calves,
It can be corrected.

[0028]

EXAMPLES Examples of the present invention will be described below in more detail, but the present invention is not limited thereto, and various applications can be made without departing from the technical concept of the present invention. It is possible. In the following text, “parts” means “parts by weight”, and “%” means “% by weight”.

Example 1 A monomer mixture consisting of 10 parts of 2-hydroxyethyl acrylate and 90 parts of 2-ethylhexyl acrylate was
To 100 parts of an acrylic polymer obtained by copolymerization under an inert gas atmosphere, 50 parts of sorbitan trioleate and 0.16 part of a trifunctional isocyanate (trade name: Coronate L, manufactured by Nippon Polyurethane Co.) as a crosslinking agent Was mixed in ethyl acetate to prepare an acrylic pressure-sensitive adhesive solution.

The obtained pressure-sensitive adhesive solution is applied to a treated surface of a separator having one surface subjected to silicone treatment to a thickness of 4 after drying.
It was applied to a thickness of 0 μm and dried at 130 ° C. for 5 minutes to form an adhesive layer.

Next, a cotton elastic sheet (basis weight: 130 g / m ² ) was attached to the surface of the obtained adhesive layer to produce an adhesive sheet, which was heated at 60 ° C. for 3 days. Thus, a stretchable adhesive tape of the present invention was produced. The elongation of the obtained elastic pressure-sensitive adhesive tape was 55%, and the tensile strength at the time of 40% elongation was 0.2 kg / 10 mm.

Comparative Example 1 An elastic pressure-sensitive adhesive tape was produced in the same manner as in Example 1 except that the amount of the crosslinking agent was changed to 0.02 part. The elongation and tensile strength of the obtained elastic pressure-sensitive adhesive tape were almost the same as those in Example 1, but the gel fraction in the pressure-sensitive adhesive layer was 5% by weight.

Comparative Example 2 A pressure-sensitive adhesive sheet was prepared by laminating an elastic sheet (basis weight: 70 g / m ² ) made of vinyl chloride as the substrate in Example 1, and had an elongation of 250% and a tensile strength of 40%. Strength 0.8
A stretchable pressure-sensitive adhesive tape was produced in the same manner as in Example 1, except that the weight was set to kg / 10 mm.

Comparative Example 3 An elastic pressure-sensitive adhesive tape was produced in the same manner as in Example 1 except that the amount of the crosslinking agent was changed to 0.5 part. The elongation and tensile strength of the obtained elastic pressure-sensitive adhesive tape were substantially the same as those in Example 1, but the gel fraction in the pressure-sensitive adhesive layer was 85% by weight.

Comparative Example 4 An uncrosslinked pressure-sensitive adhesive (gel fraction 0% by weight) was prepared in the same manner as in Example 1 except that sorbitan trioleate and trifunctional isocyanate as a crosslinking agent were not blended. In the same manner as in Example 1, a stretchable pressure-sensitive adhesive tape was produced.

Example 2 5 parts of acrylic acid, 2-ethylhexyl acrylate 95
100 parts of an acrylic polymer obtained by copolymerizing a monomer mixture comprising 50 parts of octyldodecyl myristate
And 0.02 part of a trifunctional isocyanate (trade name: Coronate HL, manufactured by Nippon Polyurethane Co., Ltd.) as a crosslinking agent in ethyl acetate to prepare an acrylic pressure-sensitive adhesive solution.

A stretchable pressure-sensitive adhesive tape of the present invention was produced in the same manner as in Example 1 except that the pressure-sensitive adhesive solution obtained as described above was used. The elongation of the obtained elastic pressure-sensitive adhesive tape is 60%, and the tensile strength at the time of 40% elongation is 0.18 kg.
/ 10 mm.

Comparative Example 5 An elastic pressure-sensitive adhesive tape was produced in the same manner as in Example 3, except that the amount of the crosslinking agent was changed to 0.015 part. The elongation and tensile strength of the obtained elastic pressure-sensitive adhesive tape were almost the same as in Example 2, but the gel fraction in the pressure-sensitive adhesive layer was 11% by weight.

Comparative Example 6 A pressure-sensitive adhesive sheet was prepared by laminating an elastic sheet (basis weight: 70 g / m ² ) made of vinyl chloride as a substrate in Example 2, having an elongation of 250% and a tensile strength of 40%. Strength 0.7
A stretchable pressure-sensitive adhesive tape was produced in the same manner as in Example 2 except that the pressure was 8 kg / 10 mm.

Comparative Example 7 A stretchable pressure-sensitive adhesive tape was produced in the same manner as in Example 3, except that the amount of the crosslinking agent was changed to 0.3 part. The elongation and tensile strength of the obtained elastic pressure-sensitive adhesive tape were almost the same as those in Example 2, but the gel fraction in the pressure-sensitive adhesive layer was 90% by weight.

Comparative Example 8 The procedure of Example 2 was repeated except that octyldodecyl myristate and a trifunctional isocyanate as a crosslinking agent were not used to prepare an uncrosslinked pressure-sensitive adhesive (gel fraction: 0% by weight). In the same manner as in Example 2, an elastic pressure-sensitive adhesive tape was produced.

Comparative Example 9 Sorbitan trioleate 50 used in Example 1
A stretchable pressure-sensitive adhesive tape was produced in the same manner as in Example 1 except that 50 parts of trimethylolpropane 2-ethylhexanoate was used instead of the parts.

Comparative Example 10 The same procedure as in Example 1 was carried out except that a pressure-sensitive adhesive sheet was prepared using a natural rubber-made elastic sheet (basis weight: 500 g / m ² ) instead of the elastic sheet used in Example 1. To prepare a stretchable pressure-sensitive adhesive tape. The obtained elastic pressure-sensitive adhesive tape did not extend to 40%, had an elongation of 20%, and had a tensile strength at 2% elongation of 2 kg / 10 mm.

Example 3 The same procedure as in Example 1 was carried out except that a pressure-sensitive adhesive sheet was prepared using a stretchable sheet made of urethane nonwoven fabric (basis weight 80 g / m ² ) instead of the stretchable sheet used in Example 1. To prepare a stretchable pressure-sensitive adhesive tape. The elongation of the obtained elastic pressure-sensitive adhesive tape was 330%, and the tensile strength at 40% elongation was 0.18 kg / 10 mm.

With respect to the elastic pressure-sensitive adhesive tapes obtained in each of the above Examples and Comparative Examples, the gel fraction of the acrylic polymer, skin adhesive strength, skin irritation, adhesive residue, repeated skin adhesiveness, and uncomfortable feeling were as follows. The results were summarized in Table 1.

<Gel Fraction> About 1 g of the acrylic polymer prepared in each Example and Comparative Example was sampled, and its weight (W ₁ ) was measured accurately. Next, each sample was immersed in ethyl acetate for 4 days to extract a solvent-soluble component.
The insoluble portion (gel portion) as a residue was separated by filtration, dried, and its weight (W ₂ ) was measured. The calculation of the gel fraction was performed by the following equation.

[0047]

(Equation 1)

<Skin Adhesive Strength> Each elastic pressure-sensitive adhesive tape
It was cut to 9 mm and attached to the volunteer's forearm. After 8 hours, it was peeled off at a speed of 300 mm / min in the 90 ° direction, and the adhesive force (stress) at that time was measured.

<Skin irritation> The skin irritation was evaluated according to the following criteria when peeled off after 8 hours of application in the skin adhesion test. 〇: There is slight irritation, or slight irritation. Δ: Pain felt somewhat painful. ×: Pain felt painful. XX: Very strong pain is felt.

<Glue residue> In the above skin adhesion test, 8
After the time pasting, when peeled, by the following criteria,
The adhesive residue on the adhered skin surface was evaluated. 〇: No adhesive residue at all. Δ: Adhesive residue occurs at the end. ×: Adhesive residue occurs in an area of 1/3 or more.

<Repeated Skin Adhesive Strength> Each elastic pressure-sensitive adhesive tape was applied to the volunteer's forearm, then immediately peeled off, and the peeled adhesive tape was applied again to the volunteer's forearm, and after 4 hours, The state of adhesion to the skin surface was visually determined. The criteria are as follows. 〇: There is no peeling of the edge at all. ×: Peeling at the end.

<Discomfort> Each stretchable adhesive tape is 75m wide.
m, cut to a length of 100 cm, stretched and wrapped around the abdomen of volunteers by about 40%, and the discomfort at that time was determined. The criteria are as follows. 〇: There is no sense of incompatibility so that you do not feel that it is attached. Δ: Somewhat uncomfortable. X: There is a sense of discomfort as much as discomfort.

[0053]

[Table 1]

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (reference) C09J 133/04 A61L 15/06 F term (reference) 4C081 AA03 AA12 BB04 CA081 CC05 4J004 AA10 AA17 AB01 CA02 CA03 CA04 CA06 CB01 CC02 FA09 4J040 DF041 DF051 HB07 HB31 HB32 HB34 HC16 HD43 JA09 JA12 KA16 LA06 MA14 NA02 PA23

Claims (2)

[Claims] 1. A gel fraction on one side of a stretchable base material of 15 to
A stretchable pressure-sensitive adhesive tape or sheet having a crosslinked pressure-sensitive adhesive layer of 80% by weight formed thereon, having an elongation of 40% or more, and a tensile strength at 40% elongation of 0.5 kg / 10 mm or less, A crosslinked pressure-sensitive adhesive layer having an acrylic polymer content of 100 parts by weight, an esterified product of a monobasic acid or polybasic acid having 8 to 20 carbon atoms and a branched alcohol having 14 to 20 carbon atoms, and / or having 14 to 20 carbon atoms A stretchable pressure-sensitive adhesive tape or sheet, comprising 30 to 100 parts by weight of an esterified product of an unsaturated fatty acid or unsaturated branched acid and a tetravalent or lower alcohol, and having been subjected to a crosslinking treatment. 2. The stretchable pressure-sensitive adhesive tape or sheet according to claim 1, wherein the crosslinking treatment is a chemical crosslinking treatment by adding any one of a polyfunctional isocyanate compound, a metal alcoholate and a metal chelate.