JPS61103976A - Adhesive tape or sheet - Google Patents

Abstract

PURPOSE:The titled novel tape having improved unwinding properties even if it is wound in rolled state, applicable in piles, having good writing properties of marking ink, by setting a specific release layer containing an ethylene-alpha olefin copolymer on a substrate. CONSTITUTION:A release layer comprising (A) an ethylene-alpha olefin copolymer, (B) a reinforcing polymer, and (C) an adhesion-reducing compound (preferably fatty acid amide) as main components is applied to the other side of a pressure- sensitive adhesive layer (main component consists preferably of natural rubber and/or synthetic rubber) of a substrate, to give the aimed tape. For example, preferably an ethylene propylene copolymer having 0.8-0.9g/cm<2> density is used as the component A, and a low-density polyethylene, etc., as the component B, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an adhesive tape or sheet having a release layer. More specifically, it has excellent unwinding properties even when wound into a roll, the tape (sheets) can be stacked, and the release layer has good writing properties with magic ink.
A non-slip adhesive tape or sheet is provided.

(Prior art) Many adhesive tapes or sheets are known, which are formed by providing a pressure-sensitive adhesive layer on one side of a support and winding it into a roll, and are widely used for packaging, bonding, surface protection, etc. .

Usually, an adhesive tape or sheet wound into a roll has a release treatment applied to its back surface in order to adjust the unwinding force to an appropriate level.1 Typical release treatment agents include:
Silicone resins are known. In this case, the silicone may migrate to the surface of the pressure-sensitive adhesive layer, or the tape (sheet) may
Cannot be overlaid, magic ink has poor writing properties,
There are problems such as pickpocketing and stealth.

In order to solve this problem, in the Ti adhesive tape or sheet, a fatty acid amide is blended into at least one of the support or the pressure sensitive adhesive layer, or a shear modulus of 2.0 is added.
X10” dyne/c!A or less (JlS K-7213
), and the surface wetting characteristics have an equilibrium contact angle of 55° or more (JIS
A method is known in which an ethylene-α olefin copolymer (K-6768) is used as the main component of the release layer.

However, although this type of adhesive tape or sheet has excellent unwinding properties when the main component of the pressure-sensitive adhesive layer is acrylic ester, The reality is that pressure adhesives do not have good unwinding properties.
Alternatively, pressure-sensitive adhesives mainly composed of synthetic rubber are softer and more fluid than acrylic adhesives, and have a larger bonding area, resulting in a greater unwinding force.

On the other hand, acrylic pressure-sensitive adhesives have problems such as weak initial tack at low temperatures, high cost, and restrictions on the types of tapes or sheets that can be used.

(Problems to be Solved by the Invention) It is an object of the present invention to provide a pressure-sensitive adhesive layer in the form of a roll having excellent unwinding properties even when the pressure-sensitive adhesive layer is mainly composed of natural and/or synthetic rubber. An object of the present invention is to provide an adhesive tape or sheet that can be rolled up.

Another object of the present invention is to provide an adhesive tape or sheet whose release layer has characteristics that allow tapes (sheets) to be stacked, has good marker ink writing properties, and has non-slip properties.

[Means for solving problems]

As a result of intensive studies to solve this object, the present inventors have discovered that acrylic-based Good unwinding properties can be obtained not only with pressure-sensitive adhesives but also with adhesive tapes or sheets wound into a roll having a pressure-sensitive adhesive layer mainly composed of natural and/or synthetic rubber. M
The present invention was based on the findings that the delamination characteristics are that tapes (sheets) can be laminated, have good marker ink writing properties, and have non-slip properties.

In other words, it's the end of the day, Iwa 1 delamination on one side, and pressure on the other side.
.

An adhesive tape or sheet comprising a support provided with an adhesive layer, the release layer comprising a composition whose main components are an ethylene-α olefin copolymer, a reinforcing polymer, and a tack-reducing compound. The present invention provides an adhesive tape or sheet characterized by:

According to the adhesive tape or sheet of the present invention, even when the main component of the pressure-sensitive adhesive layer is natural and/or synthetic rubber, good winding can be achieved even if the back surface of the tape or sheet is not subjected to release treatment. It provides reversibility.

The ethylene-α-olefin copolymer used in the practice of the present invention preferably has a density of 0.80 to 0.90 g/−. α-olefin is an alkene having a double bond at the α-position, and propylene, 1 Examples include those having 3 to 7 carbon atoms, such as -pentene, 1-butene, 4-methyl-1-pentene, and 1-hexene. Examples of the ethylene-α olefin copolymer include ethylene-1-butene random copolymer and ethylene-propylene copolymer, and one type or a mixture of several types may be used.

The reinforcing polymer used in carrying out the present invention is mixed for reinforcement because the strength of the release layer is weak in the above-mentioned ethylene-α olefin copolymer leather.
Any device can be used as long as it has such a function and does not contradict the purpose of the present invention. Examples of such polymers include thermoplastic polymers such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, and ethylene-acrylic acid copolymer. Among such reinforcing polymers,
Particularly preferably, one type of polymer or a mixture of several types of polymers having a hardness of 70 or less according to the JIS K-6301 test is used. Polymers with a hardness exceeding 70, especially polymers such as ethylene-vinyl acetate copolymer and ethylene-ethyl acrylate copolymer, increase the adhesive strength of natural and/or synthetic rubber-based pressure-sensitive adhesives, resulting in poor peeling effects. Become.

The tack-reducing compound used in the practice of the present invention is preferably a low-molecular compound compared to the ethylene-α-olefin copolymer or reinforcing polymer, such as oleic acid amide, ethylene bisamide, etc. Fatty acid amides such as stearylamide, distearylaziboamide, erucic acid amide, hexamethylenebisoleylamide, N-oleylstearylamide, ethylenebisoleylamide, polyoxyethylene glycol,
Examples include surfactants such as butyl stearate and polyoxyethylene alkyl ether phosphate, 47-fluorinated ethylene, waxes such as liquid paraffin, and silicone oil. However, when using bisamide-type fatty acid amide, it is difficult to wrap the tape. This is particularly preferred in terms of overall properties as a tape, such as return strength and adhesive strength.

The blending ratio of the main components constituting the Ifi 18 layer of the present invention is, when the weight of the reinforcing polymer is 1, the weight of the ethylene-α olefin copolymer is 0.1 to 9, and the weight of the tack-reducing compound is 0.00.
The ratio of the ethylene-α olefin copolymer to 1 weight of the reinforcing polymer is preferably 0.2 to 2.
5. The adhesion reducing compound is in the range of 0.007 to 1.

Furthermore, the pJI delamination of the present invention includes pigments, stabilizers, fillers,
It may also contain a plasticizer, antiblocking agent, crosslinking agent, etc.

The composition of the pressure-sensitive adhesive is not limited to (but is not limited to) conventionally known pressure-sensitive adhesives, such as acrylic pressure-sensitive adhesives,
Examples include pressure-sensitive adhesives whose main component is natural and/or synthetic rubber. In particular, soft and fluid natural and/or
Alternatively, the effects of the present invention can be significantly obtained when a pressure-sensitive adhesive whose main component is synthetic rubber is used.

The material of the support used in the present invention is not particularly limited, and conventionally known materials may be used. For example, polyvinyl chloride resin (a resin made by copolymerizing vinyl chloride and other resins) (including ethylene copolymers), plastic films such as polyolefin resins (including ethylene copolymers), papers such as kraft paper and Japanese paper, and fabrics such as woven fabrics and non-woven fabrics.

The adhesive tape or sheet of the present invention is usually used by winding it into a roll in a paper tube, synthetic resin tube, etc. with the adhesive layer inside.

[Action/Effect]

The effects of using a composition containing an ethylene-α olefin copolymer, a reinforcing polymer, and a tack-reducing compound as the main components of the release layer are as follows. That is, by mixing the ethylene-α olefin copolymer, '1
The degree of crystallinity of the 618N polymer is reduced, and among the three components, the tack-reducing compound, which has a relatively low molecular weight, blooms on the surface of the release layer, and the adhesive force between the tack-reducing compound and the pressure-sensitive adhesive layer increases. This seems to be because it is similar to the tensile force during unwinding.

Therefore, according to the present invention, it is important to obtain an adhesive tape or sheet that has good unwinding properties even when wound into a roll, even though the back side is not subjected to any special back side treatment. In addition, the adhesive tape or sheet of the present invention is
Since no back surface treatment is performed, it is advantageous in terms of material cost and processability, and at the same time, the problem of migration of the back surface treatment agent to the adhesive layer can be solved.

Furthermore, the adhesive tape or sheet of the present invention can provide novel III-layer release properties with its overlapping properties, marker ink writing properties, and non-slip properties.

〔Example〕

The fact that the adhesive tape or sheet of the present invention has good unwinding properties is demonstrated by the following examples, but the present invention is not limited to these examples. wLffi section.

Example 1 70 parts of low density polyethylene (M + -3.7 parts g/min, density 0.923 g/cd), 30 parts of ethylene-propylene copolymer (density -0.88 g/aJ), ethylene bisstearyl Knead 3 parts of amide in the usual manner,
Pelletize. A support is prepared by laminating the pellets to a thickness of 20 μm on kraft paper with a tsubo fi of 73 g/y.

On the other hand, a pressure-sensitive adhesive prepared by dissolving 100 parts of natural rubber, 100 parts of petroleum-based tackifying resin, and 30 parts of process oil in Dorol is used.

Next, the pressure-sensitive adhesive is applied to the support so as to have a thickness of 30 parts m after drying and dried to obtain an adhesive tape wound into a roll.

Comparative example! The component of the laminate layer of the support is low density polyethylene 10
An adhesive tape was obtained in the same manner as in Example 1, except that only one component was used.

Comparative Example 2 The component of the laminate layer of the support is low-density polyethylene 70
An adhesive tape is obtained in the same manner as in Example 1, except that only two components are used: 30 parts of ethylene-propylene copolymer and 30 parts of ethylene-propylene copolymer.

Comparative Example 3 The component of the laminate layer of the support is low density polyethylene 10
An adhesive tape was obtained in the same manner as in Example 1, except that only two components were used: 0 part of ethylene bisstearylamide and 3 parts of ethylene bisstearylamide.

The unwinding force of the above adhesive tape was measured.

(Measurement method of unwinding force) The resistance force is measured when the tape is unwound at a speed of 30 m/min in an atmosphere of 20° C. and 65% relative humidity.

(Note) Peeling between laminate layers - The adhesive layer cannot be peeled off from the laminate layer (the laminate layer peeled off from the craft).

Example 2
/・Low density polyethylene (M+-9
, 5 parts g/min, density -0,917 g/cs"> 50
parts, ethylene-1-butene random copolymer (density -0
, 89g/c+j) 50 parts, hexamethylenebisoleylamide 4 parts, N-oleylstearylamide 0.5
A base fabric (80 denier polyester fibers, 80 x 80 fibers, 71 inches) is laminated with a composition of 0.2 parts of pigment and 0.2 parts of pigment to a thickness of 30 μm to prepare a support.

On the other hand, a pressure-sensitive adhesive is prepared by kneading 100 parts of natural rubber, 120 parts of petroleum-based tackifying resin, 20 parts of process oil, and 20 parts of calcium carbonate in a Banbury mixer to fr4.

Next, the adhesive is applied to the support using a calendar roll to a thickness of 60 μm to obtain an adhesive tape.

Comparative Examples 4 to 6 When the release layer composition consists of low density polyethylene and a pigment (Comparative Example 4), low density polyethylene and ethylene-1-
When consisting of butene random copolymer and pigment (Comparative Example 5)
), low density polyethylene, hexamethylene bisoleylamide, N-oleyl stearylamide, and pigment (Comparative Example 6), adhesive tapes were obtained in the same manner as in Example 2.

The unwinding force of the above tape was measured.

Example 3 Polypropylene (density -0.90g 7cm") 8
0 parts, ethylene-propylene copolymer density -0.88
g/cm' ) 20 parts and 3 parts of a phosphate ester surfactant are mixed and peeled off J! Create a composition.

On the other hand, 100 parts of styrene-isoprene-styrene block copolymer (thermoplastic rubber), 10 parts of petroleum-based tackifying resin
A true melt type pressure sensitive adhesive consisting of 0 parts and 20 parts of process oil is prepared.

Next, use the three-layer extruder to The IIM composition, the polypropylene, and the true melt adhesive are coextruded to a thickness of 30 μm, and wound into a roll with the adhesive layer facing inside to obtain an adhesive tape.

Comparative Examples 7 to 9 @ Three release compositions: polypropylene only (Comparative Example 7), polypropylene and ethylene-propylene copolymer only (Comparative Example 8), and polypropylene and phosphate ester surfactant only (Comparative Example 9) An adhesive tape is obtained in the same manner as in Example 3 regarding the type.

The unwinding force of the above tape was measured.

(Left below) As is clear from the above examples, the unique characteristics of the present invention can only be realized when the main components of the release layer are three components: an ethylene-α-olefin copolymer, a reinforcing polymer, and an adhesion-killing compound. Effects can be obtained.

Claims (3)

[Claims] (1) An adhesive tape or sheet consisting of a support provided with a release layer on one side and a pressure-sensitive adhesive layer on the other side, the main component of the release layer being an ethylene-α olefin copolymer,
1. An adhesive tape or sheet comprising a composition containing a reinforcing polymer and a tack-reducing compound as main components. (2) The adhesive tape according to claim (1), wherein the tack-reducing compound is a fatty acid amide. (3) The adhesive tape according to claim (1) or (2), wherein the main component of the pressure-sensitive adhesive layer is natural and/or synthetic rubber.