JPH03160080A - Self-adhesive polyvinyl chloride tape - Google Patents

Abstract

PURPOSE:To obtain the title tape improved in tack on the rear side and particularly in workability as an electrical insulating self-adhesive tape by applying a rubber-base self-adhesive to one side of a base film made from PVC containing a specified amount of an elastomer. CONSTITUTION:A self-adhesive PVC tape made by applying a rubber-base self-adhesive to one side of a PVC base film, wherein a film comprising a PVC resin composition containing an elastomer in an amount of 1-15 pts.wt. based on 100 pts.wt. PVC is used as the base film. Thus by merely altering the composition of a base material while using the same composition for a self-adhesive layer as in the prior art, the tack on the rear side can be improved properly and the title self-adhesive tape greatly improved in workability particularly as an electrical insulating self-adhesive tape can be provided.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a polyvinyl chloride adhesive tape, and more specifically, the adhesive strength of the back surface of a polyvinyl chloride film as a base material is improved, and in particular, This paper relates to a polyvinyl chloride adhesive tape with improved workability as an adhesive tape. [Prior art J] A polyvinyl chloride adhesive tape using a polyvinyl chloride film as a base material (support) has a polyvinyl chloride film as a base material,
It has excellent electrical insulation, weather resistance, flame retardance, water resistance, chemical resistance, etc., and can be made to any desired hardness by increasing or decreasing the amount of plasticizer.It also has high strength and elongation, making it highly adaptable. It is widely used as electrical insulation adhesive tape, packaging adhesive tape, protective adhesive tape, anti-corrosion adhesive tape, etc. Among these uses, polyvinyl chloride adhesive tape is
It is used for insulation of connections of electric wires, cables, etc., and for other general insulation purposes. By the way, when polyvinyl chloride adhesive tape is used as an electrically insulating adhesive tape for insulating connections, etc., the actual work is roughly divided into two types as shown in FIGS. 1 and 2. That is, as shown in Figure 1, when connecting electric wires or cables, two conductor parts are butted together and connected with a crimp sleeve, and the adhesive tape is started from one insulating part,
Wrap the connecting part and finish wrapping at the other insulating part. When the tape is finished, loosen the tension, stick it firmly, and then cut the adhesive tape. Another task is to align the two conductor parts in parallel and cover them with a crimp sleeve, start wrapping the adhesive tape from the aligned insulation part, and when it has been wrapped up to the crimp sleeve, wrap the adhesive tape. Fold it to make a double roll, then cover it with the finished part and make a triple roll. Then cut the adhesive tape. These operations are usually done by hand, and the adhesive tape is also cut by pulling it by hand after it has been wound. However, especially in the case of the work shown in Figure 2, when cutting the adhesive tape, if you pull it strongly by hand, the adhesive strength between the adhesive surface and the PVC tape surface (back side) is low, so you need to fold it back and double or triple wrap it. It may unravel from the rolled part. This often required rework, and a solution was needed. [Problems to be Solved by the Invention] An object of the present invention is to overcome the problems of the prior art and to solve the problem of unraveling when cut when used as an insulating adhesive tape for connecting parts of electric wires, cables, etc. To provide a polyvinyl chloride adhesive tape that can be easily torn off without causing any damage. As a result of intensive research, the present inventors have found that when a film made of a resin composition containing polyvinyl chloride and an elastomer is used as the base polyvinyl chloride film, the polyvinyl chloride tape surface (back surface) and the rubber adhesive It was discovered that the adhesion to the surface was moderately improved, and even when double or triple wrapped, it could be easily cut by pulling it by hand without unraveling.Based on this knowledge, the present invention was developed. It was completed. [Means for Solving the Problems] According to the present invention, in a polyvinyl chloride adhesive tape formed by applying a rubber adhesive to one side of a polyvinyl chloride film base material, polyvinyl chloride is used as the base material. 1
There is provided a polyvinyl chloride adhesive tape characterized by using a film made of a resin composition containing 1 to 15 parts by weight of an elastomer per 00 parts by weight.
According to the present invention, since the base film contains an elastomer, its affinity with the rubber adhesive layer is improved, and the adhesive strength (SB adhesive strength) on the back surface of the adhesive tape is appropriately improved. As a result, even if the adhesive tape is wrapped double or triple, it will not unravel. The present invention will be explained in detail below. (Polyvinyl chloride film base material) Polyvinyl chloride adhesive tape usually uses a soft vinyl chloride film mixed with a plasticizer as the base material, but when heat resistance is required, a hard vinyl chloride film is used. Ru. In the present invention, any film can be used. Here, an example of the formulation of soft vinyl chloride film is as follows:
Generally, as follows. Vinyl film A Polyvinyl chloride ioo parts by weight (degree of polymerization =
800-1. 500) Plasticizer 30-60 parts by weight filler
O~100 parts by weight stabilizer
1-5 parts by weight pigment O-
5 parts by weight Here, as the plasticizer, general-purpose low molecular weight plasticizers such as phthalate esters such as dibutyl phthalate (DBP) and dioctyl phthalate (DOP), and phosphate esters such as tricresyl phosphate (TCP) are used. When plasticizers are used and modifications such as heat resistance are required, the amount of plasticizers used may be reduced or not used at all. As fillers, inorganic fillers such as calcium carbonate are added as appropriate depending on the purpose of use. From the viewpoint of safety, cost, tape quality, etc., PB-based stabilizers, Ba-
Zn type and Ca-Zn type are mainly used. Various pigments may be added as appropriate for coloring. In the present invention, as the base material, polyvinyl chloride 1
A film made of a composition containing 1 to 15 parts by weight, preferably 2 to 10 parts by weight of elastomer per 00 parts by weight is used. If desired, plasticizers, fillers, stabilizers, pigments, etc. are blended, but usually the plasticizer is blended in an amount of 30 to 60 parts by weight to form a soft vinyl chloride film. Examples of the elastomer include ethylene-vinyl acetate rubber (EVA), acrylonitrile-butadiene rubber (NBR), styrene-isobrene-styrene block copolymer rubber (SIS), and styrene-butadiene-styrene block copolymer rubber (SBS). Examples include hydrogenated SBS (SEBS). If the blending ratio of the elastomer is too small, the adhesive strength (SB adhesive strength, JISC-2336) of the adhesive tape on its own back side will not be improved, making it impossible to achieve the intended purpose. S
From the viewpoint of workability, the adhesive force B is preferably 105 kg/10 mm width or more, and for this purpose, the blending ratio of the elastomer is preferably 2 parts by weight or more. On the other hand, if the blending ratio of the elastomer is too large, the SB adhesive force becomes too strong and it becomes difficult to separate from the adhesive layer, which is not preferable in terms of adhesive tape rewinding work. Therefore, the blending ratio of the elastomer is as described above.
Usually, it is preferable to use 2 to 10 parts by weight. A base film can be produced using a polyvinyl chloride resin composition containing an elastomer by a general film forming method for polyvinyl chloride films, for example, by molding using an inverted L-shaped calendar roll. The thickness of the base film is usually about 140 to 180 μm. (Rubber-based adhesive) As the rubber-based adhesive applied to one side of the base material, general-purpose adhesives consisting of elastomers, tackifying resins, softeners, fillers, anti-aging agents, etc. can be used, but there are no particular restrictions. Not done. Examples of elastomers include natural rubber (NR), inbrene rubber (IR). Styrene butadiene rubber (SBR),
Various rubbers such as SBS, SIS%SEBS, butyl rubber, NBR, chloroprene rubber, silicone rubber, and recycled rubber can be used, and a blend of natural rubber and synthetic rubber may also be used. Specific formulation examples thereof are as follows, for example. Rubber, Agent A Natural rubber 70-30 parts by weight SBR
30-70 parts by weight softener
O~20 parts by weight Tackifying resin 50~
100 parts by weight Anti-aging agent 1 to 3 parts by weight The rubber adhesive is applied to the elastomer-containing polyvinyl chloride by a general adhesive tape manufacturing method such as uniformly coating the base material surface with a coater as an organic solvent solution. Coat it on a film to produce polyvinyl chloride adhesive tape. The thickness of the adhesive layer is usually about 20 to 50 μm. (The following is a blank space) [Example] The present invention will be specifically described below with reference to Examples and Comparative Examples. [Example] A polyvinyl chloride resin composition was prepared according to the following formulation and used as a raw material for a base film. L Fresh Dan L Tachibi 1 Polyvinyl chloride ($1) l O O parts by weight plasticizer (*2) 5 0 parts by weight filler (Umbrella 3) l O parts by weight Elastomer (Umbrella 4) Variable ($1) Polychloride vinyl;
Manufactured by Tokuyama Sekisui Kogyo Co., Ltd., trade name: TSIOOORS, degree of polymerization: 1
100 (Medium 2) Plasticizer: Dioctyl phthalate, manufactured by Sekisui Chemical Co., Ltd., trade name DOP-S (Table 3) Filler: Precipitated calcium carbonate, manufactured by Shiroishi Calcium Co., Ltd., trade name Shiroenka CCR (Umbrella 4) Type of elastomer and The blending ratios are shown in Table 1. Using these resin compositions, a film with a thickness of 160 μm was molded using an inverted L-shaped calendar roll. A rubber adhesive having the following formulation was used as the adhesive. Rubber, 1 A Natural rubber 50 parts by weight SBR
(Medium 5) 50 parts by weight softener (
Umbrella 6) 10 parts by weight tackifier resin (Book 7)
80 parts by weight Anti-aging agent (N8) 2 parts by weight (M5) S B R i Manufactured by Nippon Synthetic Rubber Co., Ltd., trade name Ni-Ball 1502 (Umbrella 6) Softener; manufactured by Sekisui Chemical Co., Ltd., trade name DOP (*
7) Tackifying resin; manufactured by Arakawa Chemical Co., Ltd., trade name Alcon P-
125 ($8) Anti-aging agent; manufactured by Yoshitomi Pharmaceutical Co., Ltd., trade name Yoshinox 425 On the above film, apply MMA to natural rubber as an undercoat.
MG-30 obtained by graft polymerization of 30% was coated, and a toluene solution of the above-mentioned rubber adhesive was coated thereon using a coater to a dry thickness of 30 μm. The resulting polyvinyl chloride adhesive tape had a width of 19 mm. The total thickness was 200 ILm. For each adhesive tape, the normal adhesive strength (g/10 mm width) on its own back surface was measured according to JIS C-2336. Further, the obtained polyvinyl chloride adhesive tape was used for insulating the connecting portion of electric wires as shown in FIG. 2, and its workability was evaluated in the following two stages. ×: When cutting the adhesive tape, it comes undone when pulled by hand. ○: When cutting the adhesive tape, it does not come undone even when pulled by hand. The results are shown in Table 1. For comparison, Table 1 shows the results of evaluating the adhesive strength and workability of the back surface of an adhesive tape based on polyvinyl chloride film that does not contain an elastomer. (Margin below) As is clear from Table 1, the adhesive tape of the present invention has moderately improved adhesive strength on its own back side, and as a result, has good workability, and can be folded back at the joint to double or triple Even when wrapped, the adhesive strength between the adhesive side and the tape side is strong, so when cutting,
It won't come undone. [Effects of the Invention] According to the present invention, the adhesive strength of the self-back surface can be appropriately improved by simply changing the composition of the base material while keeping the composition of the adhesive layer unchanged. According to the present invention, it is possible to provide a polyvinyl chloride adhesive tape whose workability as an electrically insulating adhesive tape is greatly improved.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing the process of wrapping a connection part for insulation using an electrically insulating adhesive tape.

Claims (1)

[Claims] (1) In a polyvinyl chloride adhesive tape formed by applying a rubber adhesive to one side of a polyvinyl chloride film base material,
A polyvinyl chloride adhesive tape characterized in that the base material is a film made of a resin composition containing 1 to 15 parts by weight of an elastomer per 100 parts by weight of polyvinyl chloride.