JP2016056270A - Self adhesive polyvinyl chloride sheet or tape and wire harness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self adhesive polyvinyl chloride sheet or tape having high working efficiency, reduced waste and low product cost because a release paper is not necessary.SOLUTION: There is provided a self adhesive vinyl chloride sheet or tape 10 having a substrate 11 consisting of a polyvinyl chloride film and a self adhesive layer 12 arranged on a single side face of the substrate 11, the self adhesive layer 12 consists of a graft polymer where natural rubber and methyl methacrylate are graft copolymerized and the graft polymer has a graft ratio of methyl methacrylate defined by (mass of methyl methacrylate bound to natural rubber/mass of natural rubber used for grafting)×100 of 30% or more.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a self-adhesive vinyl chloride sheet or tape used for an automobile wire harness and the like, and a wire harness using the same.

  The wire harness is obtained by converging a plurality of electric wires by a converging unit. Conventionally, double-sided adhesive tapes, adhesives, and pressure-sensitive adhesives have been used as means for concentrating the electric wires.

  Among these, as a prior art regarding a double-sided adhesive tape, for example, Patent Document 1 contains amorphous synthetic silica and a natural rubber-based pressure-sensitive adhesive on both sides or one side of a support made of a multi-layer base paper. And a releasable pressure-sensitive postcard recording paper having a pressure-sensitive adhesive layer that can be peeled off after bonding. When the releasable pressure-sensitive postcard recording paper disclosed in Patent Document 1 is used as a double-sided adhesive tape, the release paper is attached to the surface of the pressure-sensitive adhesive layer.

JP 2011-104840 A JP 2001-348547 A

  However, in the releasable pressure-sensitive postcard recording paper described in Patent Document 1, the work of peeling the release paper from the pressure-sensitive adhesive layer occurs, resulting in poor work efficiency. There is a problem of becoming. In addition, when the release paper is not used in the double-sided adhesive tape, the exposed pressure-sensitive adhesive layer sticks to the jig or product, or the surface state of the pressure-sensitive adhesive layer deteriorates compared to the case where the release paper is used. Therefore, it is not preferable. In addition, the releasable pressure-sensitive postcard recording paper described in Patent Document 1 has a problem that its strength and water resistance are low because the support is a multilayer paper.

On the other hand, a technique has been proposed in which a self-adhesive layer made of a self-adhesive adhesive is provided on a base material such as a vinyl chloride sheet as a focusing means that does not use release paper. For example, in Patent Document 2, 90-50 parts by weight of natural rubber and / or SBR (styrene butadiene rubber) as a pressure-sensitive adhesive constituting the self-adhesive layer, and natural rubber and MMA (methyl methacrylate) are graft copolymerized. A pressure-sensitive adhesive composition containing 10 to 50 parts by weight of the graft polymer is disclosed. In this pressure-sensitive adhesive composition, the graft polymer is obtained by graft copolymerization of 80 to 60% by weight of natural rubber and 20 to 40% by weight of MMA (methyl methacrylate), and has a Mooney viscosity of 60 to 90Ms _{1 + 4.} (100 ° C.). According to the pressure-sensitive adhesive composition of Patent Document 2, a high unwinding force can be obtained.

  However, in the pressure-sensitive adhesive composition of Patent Document 2, the content of MMA (methyl methacrylate) in the pressure-sensitive adhesive composition is as low as 2 to 20% by weight in order to obtain a high unwinding force. For this reason, when the plasticizer contained in the vinyl chloride sheet as the base material moves into the pressure-sensitive adhesive composition constituting the self-adhesive layer, the pressure-sensitive adhesive composition softens and the self-adhesiveness of the self-adhesive layer decreases. There is a problem. Since the penetration of plasticizer into the self-adhesive layer usually becomes easier as the temperature increases, the self-adhesion of the self-adhesive layer decreases when the laminate of the vinyl chloride sheet and the self-adhesive layer is placed at a high temperature. It's easy to do.

  For this reason, when using a vinyl chloride sheet base material having high strength and water resistance as a converging means, it is necessary to use a double-sided adhesive tape having a release paper, and an operation of peeling the release paper from the self-adhesive layer occurs. There was a problem that the work efficiency was poor and the release paper after peeling became waste.

  The present invention has been made in view of the above circumstances, and by disposing a self-adhesive layer having plasticizer resistance on one side of a vinyl chloride sheet base material, a release paper is unnecessary, so that work efficiency is high and discarded. An object of the present invention is to provide a self-adhesive vinyl chloride sheet or tape having a reduced product cost and a low product cost, and a wire harness using the same.

  The self-adhesive vinyl chloride sheet or tape according to the first aspect of the present invention comprises a base material made of a polyvinyl chloride film, and a self-adhesive layer provided on one side of the base material, and the self-adhesive layer Is composed of a graft polymer obtained by graft copolymerization of natural rubber and methyl methacrylate, and this graft polymer is (mass of methyl methacrylate bonded to natural rubber / mass of natural rubber used for grafting) × The graft ratio of methyl methacrylate defined by 100 is 30% or more.

  The self-adhesive vinyl chloride sheet or tape according to the second aspect of the present invention is the self-adhesive vinyl chloride sheet or tape according to the first aspect, wherein the graft ratio of the graft polymer constituting the self-adhesive layer is 30. It is characterized by ˜50%.

  The wire harness according to the third aspect of the present invention is characterized in that the electric wires are bundled with the self-adhesive vinyl chloride sheet or tape according to the first or second aspect.

  According to the self-adhesive vinyl chloride sheet or tape of the present invention, since release paper is not used, work efficiency is improved and waste can be reduced. In addition, according to the self-adhesive vinyl chloride sheet or tape of the present invention, the self-adhesive vinyl chloride sheet or tape does not substantially stick to other parts because the adhesiveness is not expressed except for the adhesive surfaces. . Furthermore, according to the self-adhesive vinyl chloride sheet or tape of the present invention, even if the plasticizer contained in the vinyl chloride sheet moves into the adhesive composition constituting the self-adhesive layer, the self-adhesion of the self-adhesive layer. Sex can be maintained.

  According to the wire harness of the present invention, since release paper is not used, work efficiency is improved and waste can be reduced. Further, according to the wire harness of the present invention, since the adhesiveness is not expressed except between the adhesive surfaces of the self-adhesive vinyl chloride sheet or tape, it is substantially that the self-adhesive vinyl chloride sheet or tape sticks to other parts. Not really. Furthermore, according to the wire harness of the present invention, even if the plasticizer contained in the self-adhesive vinyl chloride sheet or the vinyl chloride sheet of the tape moves into the adhesive composition constituting the self-adhesive layer, the self-adhesive layer Self-adhesiveness can be maintained.

It is a figure which shows the layer structure of a self-adhesive vinyl chloride sheet or a tape. It is a cross-sectional view of a wire harness. It is a figure which shows the manufacturing process of a wire harness.

  Hereinafter, embodiments of the self-adhesive vinyl chloride sheet or tape of the present invention will be specifically described with reference to the drawings.

[Self-adhesive vinyl chloride sheet or tape]
FIG. 1 is a diagram showing a layer structure of a self-adhesive vinyl chloride sheet or tape. As shown in FIG. 1, the self-adhesive vinyl chloride sheet or tape 10 according to this embodiment includes a base material 11 and a self-adhesive layer 12 provided on one side of the base material 11.

(Base material)
The base material 11 consists of a polyvinyl chloride film. A well-known thing can be used as a polyvinyl chloride film, For example, the well-known adhesive tape and the polyvinyl chloride film for base materials of a sheet | seat can be used. These polyvinyl chloride films for base materials of pressure-sensitive adhesive tapes and sheets are preferable because they usually contain a plasticizer, are inexpensive, excellent in moldability and processability, and have a good balance between flexibility and strength. Here, as the plasticizer, for example, trimellitic plasticizers such as phthalic acid ester, adipic acid ester, polyester plasticizer, trimellitic acid ester are used.

  Generally, when these plasticizers move into the pressure-sensitive adhesive composition constituting the self-adhesive layer, the pressure-sensitive adhesive composition softens and the self-adhesiveness of the self-adhesive layer decreases. On the other hand, in the self-adhesive vinyl chloride sheet or tape according to this embodiment, the graft polymer itself constituting the self-adhesive layer is excellent in plasticizer resistance, so that even if the plasticizer enters, high self-adhesion Maintain sex.

  Although the thickness of a base material is not specifically limited, Usually, 50-600 micrometers, Preferably it is 200-400 micrometers. When the thickness of the substrate is within this range, the balance between flexibility and strength of the polyvinyl chloride film is good.

(Self-adhesive layer)
The self-adhesive layer 12 is made of a graft polymer and is provided on one side of a substrate made of a polyvinyl chloride film. The graft polymer constituting the self-adhesive layer is a polymer obtained by graft copolymerization of natural rubber and methyl methacrylate. Here, as the natural rubber, for example, known natural rubber, trans-polyisoprene, or the like is used.

  The graft polymer constituting the self-adhesive layer has a graft ratio of methyl methacrylate as defined by (mass of methyl methacrylate bonded to natural rubber / mass of natural rubber used for grafting) × 100, 30% As mentioned above, Preferably it is 30 to 50%, More preferably, it is 35 to 45%. The graft ratio is usually calculated from the mass ratio of natural rubber, which is a raw material at the time of producing the graft polymer, and MMA.

  When the graft ratio of the graft polymer is within the above range, the plasticizer resistance, particularly the plasticizer resistance at a high temperature of about 40 to 100 ° C. is excellent, which is preferable. Here, the plasticizer resistance refers to a characteristic that the self-adhesive property of the self-adhesive layer is substantially maintained even when the plasticizer present in the base material enters the graft polymer constituting the self-adhesive layer. Moreover, self-adhesive means the characteristic by which this self-adhesive state is maintained when the self-adhesive vinyl chloride sheet or the self-adhesive layers of a tape are made to contact and adhere. In addition, when the self-adhesive vinyl chloride sheet or tape substrate and the self-adhesive layer are brought into contact with each other and adhered to each other, this adhesive state is maintained as back-side adhesiveness.

  On the other hand, when the graft ratio of the graft polymer is less than 30%, the plasticizer resistance is lowered, and the graft polymer may be softened by the plasticizer in the base material and the self-adhesion of the self-adhesion layer may be lowered. is there. On the other hand, when the graft ratio of the graft polymer exceeds 50%, the graft polymer constituting the self-adhesive layer becomes hard and the self-adhesiveness may not be sufficient.

  In general, the higher the temperature, the easier the plasticizer moves from the substrate to the self-adhesive layer, so the plasticizer resistance tends to decrease at high temperatures. On the other hand, since the self-adhesive layer of this embodiment has high plasticizer resistance at a high temperature of about 40 to 100 ° C., the self-adhesion is sufficiently reduced even at such a high temperature and sufficient self-adhesion is exhibited. Is done.

  A known method can be used as a graft copolymerization method for producing the graft polymer. For example, a method in which methyl methacrylate is added to natural rubber latex and graft copolymerized in the presence of a radical polymerization initiator (latex grafting method), natural rubber, methyl methacrylate and a radical initiator are brought into a molten state of natural rubber. In such a state, a method of kneading and graft copolymerization (melt grafting method) or the like is used.

  The thickness of the self-adhesive layer made of the graft polymer is not particularly limited, but is usually 1 to 50 μm, preferably 15 to 40 μm. When the thickness of the self-adhesive layer is within this range, the polyvinyl chloride film sufficiently exhibits self-adhesiveness while having sufficient flexibility.

  If the thickness of the self-adhesive layer is less than 1 μm, sufficient self-adhesiveness may not be obtained. When the thickness of the self-adhesive layer exceeds 50 μm, it takes a long time to dry the graft polymer as an adhesive, and the self-adhesive layer is easily foamed, resulting in a decrease in productivity. The price of the vinyl chloride sheet or tape may increase significantly.

  If necessary, an additive may be blended in the graft polymer constituting the self-adhesive layer. Examples of the additive to be blended include an antioxidant and a thickener. Here, the antioxidant is a component that prevents or suppresses oxidation of the graft polymer. As the antioxidant, for example, an antioxidant such as a phenol-based antioxidant, an amine-based antioxidant, a benzimidazole-based antioxidant, a dithiocarbamate-based antioxidant, or a phosphorus-based antioxidant is used.

  The thickener is a component that increases the viscosity of the graft polymer. As the thickener, for example, a primal series manufactured by Rohm and Haas Japan Co., Ltd., a carbopol series manufactured by BF Goodrich Co., Ltd., or a Pemlen series thickener is used. As the primal series thickener, for example, Primal RM-4, Primal RM-5, Primal TT-615, Primal TT-935, and Primal TT-950 are used. As the thickener of the carbopol series, for example, carbopol 981, carbopol 934, carbopol ETD2020, carbopol EZ-1, and carbopol Ultrez 10 are used. As the thickener of Pemlen series, for example, Pemlen TR-1 and Pemlen TR-2 are used. Said thickener can be used by 1 type or in combination of 2 or more types.

  Furthermore, as the thickener, other thickeners may be included as long as the thickening action of the thickener such as the above-mentioned primal series is not inhibited. Examples of the thickener used in combination in this way include polysaccharides such as polyvinyl alcohol, carboxymethyl cellulose, and xanthan gum. These thickeners such as polyvinyl alcohol can be used alone or in combination of two or more.

  For example, 0.5 to 5 parts by mass of the antioxidant is contained with respect to 100 parts by mass of the graft polymer. A thickener is contained, for example, 0.5 to 2 parts by mass with respect to 100 parts by mass of the graft polymer.

(Primer layer)
When the self-adhesive layer is formed on the surface of the base material, it is preferable to form a primer layer between the base material and the self-adhesive layer as necessary in order to improve the adhesion between the base material and the self-adhesive layer. In this case, the self-adhesive vinyl chloride sheet or tape is laminated in the order of the base material, the primer layer, and the self-adhesive layer. The primer layer is formed, for example, by applying a primer to the surface of the substrate and drying the primer. As the primer, for example, a modified NBR primer obtained by adding acrylonitrile butadiene rubber to a graft polymer obtained by graft polymerization of methyl methacrylate on natural rubber is used.

  Although the thickness of a primer layer is not specifically limited, Usually, 0.01-10 micrometers, Preferably it is 0.1-0.5 micrometer. If the thickness of the primer layer is less than 0.01 μm, the adhesion between the substrate and the self-adhesive layer may not be sufficiently obtained. If the thickness of the primer layer exceeds 10 μm, the formation of the self-adhesive layer on the surface of the primer layer and the adhesiveness of the self-adhesive layer will be adversely affected. It may decrease.

(Function)
Since the self-adhesive vinyl chloride sheet or tape according to the present embodiment has a self-adhesive layer excellent in plasticizer resistance, the self-adhesive property of the self-adhesive layer is hardly lowered by the plasticizer in the vinyl chloride sheet substrate. . For this reason, the self-adhesive vinyl chloride sheet or the self-adhesive layer when the self-adhesive layers of the tape are adhered to each other and the back adhesive property when the self-adhesive layer and the vinyl chloride sheet substrate are adhered are long-term. Expresses well. Moreover, the self-adhesive vinyl chloride sheet or the self-adhesive layer of the tape has excellent plasticizer resistance at a high temperature of about 40 to 100 ° C. For this reason, even when the self-adhesive vinyl chloride sheet or tape is stored or used at a high temperature, the self-adhesiveness and the back-side adhesiveness are well expressed for a long period of time.

  A self-adhesive vinyl chloride sheet or tape is used, for example, as a component of a wire harness for automobiles. Next, the wire harness according to the present embodiment will be described.

[Wire Harness]
FIG. 2 is a cross-sectional view of the wire harness. FIG. 3 is a diagram illustrating a manufacturing process of the wire harness. As shown in FIG. 2, the wire harness 1 according to the present embodiment is obtained by converging the electric wires 20 with the self-adhesive vinyl chloride sheet or tape 10 according to the present embodiment. There are usually a plurality of electric wires 20 to be focused, and a connector is attached to the end of the electric wire 20.

  In the wire harness 1, the plurality of electric wires 20 are wound so that, for example, the self-adhesive vinyl chloride sheet or the self-adhesive layer 12 of the tape 10 is in contact with the surface of the electric wire 20, and the self is not in contact with the surface of the electric wire 20. The two self-adhesive layers 12 in the surplus portion 15 of the adhesive vinyl chloride sheet or tape 10 are self-adhesive to converge. Note that gaps 25 are formed between the plurality of electric wires 20 and between the surface of the electric wires 20 and the self-adhesive layer 12 of the self-adhesive vinyl chloride sheet or tape 10.

  The manufacture of the wire harness 1 is as follows. First, as shown in FIG. 3, a plurality of electric wires 20 are arranged on the self-adhesive vinyl chloride sheet or the self-adhesive layer 12 of the tape 10. Next, the both ends of the self-adhesive vinyl chloride sheet or tape 10 are pulled up in the direction shown by the symbol X in FIG. 3, and the plurality of electric wires 20 are separated by the self-adhesive layer 12 of the self-adhesive vinyl chloride sheet or tape 10. Get involved. Furthermore, as shown in FIG. 2, when the two self-adhesive layers 12 and 12 in the surplus part 15 of the both ends of a self-adhesive vinyl chloride sheet or tape 10 are made to contact and self-adhere, the wire harness 1 will be obtained. It is done.

(Function)
The wire harness according to the present embodiment focuses the wires using a self-adhesive vinyl chloride sheet or tape that exhibits excellent plasticizer resistance and exhibits good self-adhesion and back-side adhesion for a long period of time. It is performed well for a long time. Moreover, since the wire harness which concerns on this embodiment is excellent in the plasticizer resistance in the high temperature of about 40-100 degreeC in the self-adhesive vinyl chloride sheet or tape, even when using it under high temperature, it is an electric wire favorable for a long period of time. Can be focused.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited to these Examples.

[Example 1]
(Preparation of emulsion adhesive mixture for self-adhesive layer formation)
Graft copolymerization using natural rubber (NR, ULACOL, manufactured by Regex Corp.) and 30 parts by mass of methyl methacrylate (MMA, methyl methacrylate monomer manufactured by Kuraray Co., Ltd.) in the presence of a radical polymerization initiator. Thus, an emulsion pressure-sensitive adhesive (graft polymer) having a graft ratio of 30% was produced. Table 1 shows the production conditions and properties of the emulsion adhesive.
Next, 1 part by mass of an antioxidant (Cerosol K-319 manufactured by Chukyo Yushi Co., Ltd.) and 1 part by mass of a thickener (TT615 manufactured by Rohm and Haas Japan Co., Ltd.) with respect to 100 parts by mass of the emulsion adhesive. Were added and stirred using a stirrer. Thereby, the emulsion adhesive mixture for self-adhesive layer formation containing the emulsion adhesive with a graft ratio of 30% was obtained.

(Production of self-adhesive vinyl chloride sheet)
First, a modified NBR-based primer was applied to the surface of a vinyl chloride sheet (thickness: 400 μm) as a base material and dried to form a primer layer having a thickness of 0.3 μm on the surface of the vinyl chloride sheet.
The vinyl chloride sheet is composed of 50 parts by mass of a plasticizer, 4 parts by mass of a composite stabilizer for Ca—Zn-based vinyl chloride, and 20 parts by mass of a CaCO ₃ -based filler with respect to 100 parts by mass of polyvinyl chloride having a polymerization degree of 1100. A colorant, an ultraviolet absorber, and a lubricant were mixed using a Banbury mixer so that each component was uniformly dispersed, and then formed into a thickness of 400 μm using a T-die molding machine. The modified NBR primer is obtained by adding acrylonitrile butadiene rubber to a graft polymer obtained by graft polymerization of methyl methacrylate on natural rubber.
Next, the emulsion pressure-sensitive adhesive mixture was applied to the surface of the primer layer, and dried at 120 ° C. for 3 minutes using an oven. As a result, 0.4 mm thick vinyl chloride sheet / 0.3 μm thick primer layer / thickness A self-adhesive vinyl chloride sheet having a three-layer structure of a self-adhesive layer having a thickness of 30 μm was obtained. A test piece was cut out from the self-adhesive vinyl chloride sheet.

(Evaluation)
Using the test piece, self-adhesive strength, back-side adhesive strength and plasticizer resistance were evaluated.

<Self-adhesive strength>
First, two test pieces were prepared, the self-adhesive layers of the test pieces were bonded together, and left for 30 minutes. Next, the force required to peel off the two test pieces at a speed of 300 mm / min at 25 ° C. was measured. The peeling direction of the test piece was such that the angle formed by the two test pieces after peeling was 180 °.
The self-adhesive strength is preferably large. For this reason, the case where the force required for peeling is 10 N / 20 mm or more is evaluated as ◎ (very good), and the case where it is 1 N / 20 mm or more and less than 10 N / 20 mm is evaluated as ○ (good), and 1 N / 20 mm. The case of less than was evaluated as x (defect).

<Rear adhesive strength>
In accordance with JIS C 2107 item 11, test method A-2, the back adhesive strength was measured. Specifically, first, the first test piece is attached to the standard test plate at a predetermined pressure at 25 ° C., and then the second test piece is placed on the back surface (base material) side of the first test piece. Pasted. Next, the force required to peel off the second test piece at a specific speed from the back surface of the first test piece at an angle of 180 ° at 25 ° C. was measured.
The back adhesive strength is preferably small. For this reason, the case where the force required for peeling was less than 1 N / 20 mm was evaluated as ◎ (very good), and the case where it was 1 N / 20 mm or more was evaluated as x (defect).

<Plasticizer resistance>
Two test pieces were prepared, the self-adhesive layers of the test pieces were bonded together, left in an oven at 100 ° C. for 168 hours, and then the two test pieces were slowly peeled off at 25 ° C. The peeling direction of the test piece was such that the angle formed by the two test pieces after peeling was 180 °. The self-adhesive layer of the peeled test piece was observed, and the self-adhesive layer maintained the same properties without being softened to liquid before and after being peeled, and evaluated as ◎ (very good). . Moreover, what the self-adhesion layer of the peeled test piece softened in the liquid state was judged to be the influence of a plasticizer, and was evaluated as x (defect).
Table 1 shows the results of self-adhesive strength, back-side adhesive strength, and plasticizer resistance.

[Examples 2 to 5, Comparative Examples 1 to 3]
An emulsion adhesive was produced in the same manner as in Example 1 except that the production conditions and properties of the emulsion adhesive were changed as shown in Table 1. And the self-adhesive vinyl chloride sheet and the test piece were produced like Example 1 except having used this emulsion adhesive. In addition, the emulsion adhesive produced by the comparative example 1 consists of natural rubber which does not use MMA. Using the test piece, the self-adhesive strength, the back-side adhesive strength and the plasticizer resistance were evaluated in the same manner as in Example 1. Table 1 shows the measurement results.
In addition, about Example 2, the self-adhesive layer external appearance which is an external appearance of a self-adhesive layer was also evaluated about the self-adhesive vinyl chloride sheet immediately after taking out from oven after completion | finish of drying. The evaluation method of the self-adhesive layer appearance is shown below.

<Appearance of self-adhesive layer>
Immediately after taking out the self-adhesive vinyl chloride sheet having a three-layer structure obtained by drying at 120 ° C. for 3 minutes using an oven from the oven, the appearance of the surface of the self-adhesive layer was observed. When the surface of the self-adhesive layer was smooth and the surface was smooth, it was evaluated as 評 価 (very good), and when the surface of the self-adhesive layer was cracked or foamed, it was evaluated as x (defect).
The evaluation results of the appearance of the self-adhesive layer of Example 2 are shown in Table 1 together with the results of self-adhesive strength, back surface adhesive strength, and plasticizer resistance.

[Comparative Example 4]
A double-sided pressure-sensitive adhesive tape (No. 7770, manufactured by Teraoka Seisakusho Co., Ltd., non-woven fabric support, acrylic pressure-sensitive adhesive, total thickness 0.16 mm) was applied to the surface of the vinyl chloride sheet (thickness 400 μm) used in Example 1. A vinyl chloride sheet with double-sided adhesive tape was prepared. About this vinyl chloride sheet with a double-sided adhesive tape, the test piece was produced like Example 1. FIG. Using the test piece, the self-adhesive strength, the back-side adhesive strength and the plasticizer resistance were evaluated in the same manner as in Example 1. Table 1 shows the measurement results.

  From Table 1, when the graft ratio of the graft polymer constituting the self-adhesive layer is 30%, 40% and 50%, the self-adhesive strength, the back-side adhesive strength and the plasticizer resistance are all ◎ (very good). I understand that there is.

[Examples 6 to 9]
3 in the same manner as in Example 2 except that the coating amount of the emulsion pressure-sensitive adhesive mixture was changed so that the thickness of the self-adhesive layer became the value shown in Table 1. A self-adhesive vinyl chloride sheet having a layer structure was obtained. A test piece was cut out from the self-adhesive vinyl chloride sheet, and self-adhesive strength, back-side adhesive strength, and plasticizer resistance were measured in the same manner as in Example 1.
Further, the self-adhesive layer appearance of the self-adhesive vinyl chloride sheet immediately after taking out from the oven was evaluated in the same manner as in Example 2.
Table 1 shows the results of self-adhesive strength, back-side adhesive strength, plasticizer resistance, and self-adhesive layer appearance.

  From Table 1, it can be seen that when the thickness of the self-adhesive layer is 10 to 40 μm, the appearance of the self-adhesive layer is ◎ (very good).

  As mentioned above, although this invention was demonstrated by embodiment, this invention is not limited to these, A various deformation | transformation is possible within the range of the summary of this invention.

  The self-adhesive vinyl chloride sheet or tape of this embodiment is used for, for example, an automobile wire harness. The wire harness of this embodiment is used for an automobile wire harness or the like.

DESCRIPTION OF SYMBOLS 1 Wire harness 10 Self-adhesive vinyl chloride sheet or tape 11 Base material 12 Self-adhesive layer 15 Excess part 20 Electric wire 25 Space | gap

Claims (3)

A substrate made of a polyvinyl chloride film;
A self-adhesive layer provided on one side of the substrate;
With
The self-adhesive layer is composed of a graft polymer obtained by graft copolymerization of natural rubber and methyl methacrylate. The graft polymer is expressed as (mass of methyl methacrylate bonded to natural rubber / natural rubber used for grafting. The self-adhesive vinyl chloride sheet or tape, wherein the graft ratio of methyl methacrylate defined by (mass of) x 100 is 30% or more.   The self-adhesive vinyl chloride sheet or tape, wherein a graft ratio of the graft polymer constituting the self-adhesive layer is 30 to 50%.   A wire harness, wherein the electric wires are bundled with the self-adhesive vinyl chloride sheet or tape according to claim 1 or 2.

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