JPH0321686A - Mutual bonding tape in wet state - Google Patents

Abstract

PURPOSE:To obtain the subject tape capable of providing an uncoated surface of a substrate with nonblocking properties by applying a tacky adhesive containing a synthetic resin emulsion as a principal agent onto a plastic film substrate having excellent coating suitability and drying the resultant substrate. CONSTITUTION:The objective tape obtained by applying a tacky adhesive containing a synthetic resin emulsion having ester, ether bonds, etc., as a principal agent (preferably containing >=50% principal agent and <=50% synthetic resin emulsion or latex, etc., as an assistant) onto a plastic film substrate, subjected to original coloring or printing processing and having excellent coating suitability, drying the resultant film substrate and forming a film thereon.

Description

Detailed Description of the Invention (a) Industrial Application Field The mutual adhesive tape of the present invention can be used for labels, signs, etc. in an appropriate size and in a wet state or in the presence of moisture.
It relates to the field of use as display devices and signs for fishing lures, etc., and as tying devices for fishing rods and other items.

(b) Conventional technology A wide variety of adhesives and adhesive tapes (hereinafter referred to as adhesive tapes) are known, but they are generally hydrophobic and do not react well in wet conditions or in the presence of water. None of them could be used or used under such conditions because their adhesive performance would be significantly reduced in the environment.

←→ Problems to be solved by the invention The mutual adhesive tape (adhesive tape of adhesive tapes) that can be used in a humid environment or in the presence of moisture, and its use. Issues include the display function and decoration required by the purpose, as well as the water resistance of the coloring.

(d) Means for solving the problem In terms of water resistance, the base material for applying the adhesive is a plastic film, and the coating agent for forming the adhesive or adhesive layer on it is as follows: Rather than being hydrophobic, it should be slightly hydrophilic or hydrophilic, with good wettability and adhesion to the substrate, and the dried film should be non-swellable or weakly (slightly) swellable with water. In addition, the adhesive layer uses a material that can be pressure-sensitively bonded.

That is, there are synthetic resin emulsions that have this physical property, and among these, ester bonds, ether bonds, and similar substances are used singly or as main ingredients, and are used as a blend.

The blending resin used is a synthetic resin emulsion or rubber latex that is compatible with the emulsion used as the main ingredient.

Since this processed product is used in the form of a roll, the adhesive layer is coated or filmed on the base material for good adhesion, and when unrolled from the roll. , must not come off from the base material.

In addition, it must not block the uncoated surface of the base material and must be easily peelable.

In this case, first, if the adhesive has poor adhesion to the base material, the base material should be pretreated with corona treatment, or the affinity and adhesion for the base material and coating agent (adhesive) should be improved. It should be treated with a strong primer.

After the adhesive layer is formed on the base material, depending on the base material, it may be necessary to treat it as tx < r.In addition, in some cases, it may be treated with a silicon compound, or if the adhesive layer is formed on both sides. As a non-blocking liner, a plastic film such as polyolefin, polyester, polycarbonate, polyamide, etc. or release paper is used.

Of course, the non-coated surface of the base material may be made non-blocking before coating.

In addition to the above-mentioned adhesion, adhesion functions, and use functions, display functions and decorative properties are also required due to the purpose of use. The base material shall be printed as a pre-coating process.

Since water resistance is required for the purpose of use, pigments are used instead of dyes as coloring agents, and fluorescent, phosphorescent, and thermosensitive pigments are used as functional pigments. This is how it was done.

(e) Function Synthetic resin emulsions with ester bonds or ether bonds, or similar products include acrylic esters, vinyl acetate-based products, polyurethane-based products, and copolymers thereof. However, they have good wettability, that is, adhesion, to the base plastic film, and the dry film is hydrophilic due to its polar groups and the properties of the emulsifier in the emulsion, and it is difficult to press the adherend or adhesive films together. Then, the structural type (crosslinking reaction type) of the polymer is different from the crosslinked type, such as epoxy or polyurethane, and the raw material is an emulsion and has a relatively small molecular weight. Coupled with this, the degree of freedom of molecular activity is large, and pressure-sensitive adhesion can easily occur, exceeding the non-adhesive or weakly adhesive properties of the adhesive surface.

In addition, by using non-vulcanized rubber latex and resin emulsion with a lower molecular weight than the main emulsion or one with many polar groups,
Its physical properties are even more sticky.

Plastic films coated with adhesives have good adhesion in most cases, but polyolefin and polyester films are highly hydrophobic, so they must be treated with corona discharge, solvent coated, or similar or compatible with the film. By applying a primer coating with a strong adhesive, the surface of the base material can be activated and the adhesion of the adhesive can be improved.

If this adhesive is coated on one side of a base material, dried, and rolled, the adhesive will be printed on the uncoated back side of the base material when it is unrolled, making it difficult to put it into practical use. It may be difficult.

In this case, after coating the adhesive on the base material and drying it,
As a non-blocking agent, a solution of silicate, silicic acid, sericite (sericite), organosilicon compound (polymethylsiloxane), organofluorine compound (acrylic acid fluorinated alkyl ester), etc. is applied to the non-coated surface of the substrate. Either coat it or immerse the entire surface in the solution, dry it, and then roll it up.

In this way, the mutual adhesive sheet (tef) does not separate from the base material. Of course, one side may be subjected to non-blocking treatment before being coated on the base material.

Furthermore, in terms of the utility value as a product, the problem of coloring for display functions and decorative purposes can be solved by using pigments instead of using dyes because they have poor water resistance and bleed or migrate.

Decorative properties can be further enhanced by using pigments that are fluorescent, phosphorescent, and temperature-indicating.

Regarding their usage, the safest method is to blend them as one of the raw materials for the base film and form them into a film. Printing or textile printing using

Generally speaking, it cannot be denied that water-soluble inks have poorer adhesion to substrates than solvent-based inks.

(f) Examples Example 1 A yellow colored vinyl film with a thickness of 30 microns is used as a base material, and the following composition is applied to a thickness of 3 microns.

Coating agent (adhesive layer) mainly consists of emulsion or adhesive, vinyl acetate. ethylene. 65 parts of special ester (manufactured by Sumitomo Chemical Co., Ltd., Sumiriki Flex 950, solid content 53%), mainly used for adhesion to base materials, and ethylene. 35 parts of vinyl acetate (manufactured by Sumitomo Chemical Co., Ltd., Sumiki Flex 400, solid content 55%), 0 parts of Suiko, colloidal silica (Nissan Chemical Co., Ltd.) as a thickener for viscosity adjustment.
(manufactured by Snowtex C, solid content 20%) are mixed, coated, and dried at 90° to ixo'c to form an adhesive layer.

As a post-processing process, 3% of silica emulsion (Shin-Etsu Chemical ■, Silfix, effective 15%) was added.
Pass through a concentration adjustment solution, dry and wind up into a roll.
Cut this into rounds and make it into tape.

Example 2 One side of a 30 micron thick polyester film was gravure coated with a solvent-based (toluene, methyl ethyl ketone) printing ink containing an orange fluorescent pigment whose main vehicle was a vinyl resin copolymer, and dried. and use it as a base material.

The following composition is applied to the printed surface to a thickness of 3 (1 chrome).

Coating agent (adhesive layer) Yumaru Yon's composition is 50 parts of acrylic ester copolymer (Teikoku Kagaku Sangyo ■, Teisan Resin A 730 N + solid content 45%), 50 parts of natural rubber latex. 1 part and 20 parts of water, thickened with 5 parts of 20% aqueous ammonia, coated, dried, and then post-treated as in Example 1.

In this case, the printing may be done on the opposite side to which the adhesive is applied.

The above is an example of implementation, but in addition to the plastic film used as the base material, moisture-proof cellophane and polyolefin include polyethylene, polypropylene, vinylidene chloride, polystyrene, acrylic, and polyolefin. Carbonate, polyfluorinated vinyl, polyamide, etc., and their composite films can be used, as well as common pigments, fluorescent 5, phosphorescent, etc. It is used by applying original coloring, full-surface printing, pattern printing, etc. using temperature-sensitive pigments.

Pretreatment before applying the adhesive is carried out depending on the type of film and coating agent, but corona treatment, undercoating, etc. are performed, and a non-blocking agent is applied to the back side of the base material in advance. It may be coated or sprayed.

Regarding the type of adhesive, the main ingredient is an ester bond or an emulsion with a structure similar to it, such as acrylic ester, vinyl acetate, polyurethane, and their copolymers, such as ethylene. ．． Vinyl acetate (EVA.)tt, etc., and those having an ether bond include polyvinyl ether and copolymers thereof, such as acrylonitrile and copolymers with acrylic esters.

Those that are blended with the base resin and used in a proportion equal to or lower than that of the base resin are those that are compatible with the base resin, such as polyvinyl chloride, vinyl/reaester, polyvinyl pyrrolidone, and polyvinyl pyrrolidone. It is an emulsion of synthetic resins such as beer alcohol, polyamide, and polyacrylamide, and the rubbers include natural rubber and styrene. Butadiene (SBR), Nitori/Re. Phtadiene (NBR).
Chloroprene (OR). ! It is made of rubber latex.

In addition, in order to improve coating suitability for the base material, softeners or plasticizers for the emulsion, wetting agents, such as anionic surfactants, dialkyl sulfosuccinate salts, etc., are needed to improve the wetting of the base film. ，
Alkylnaphthalene sulfonate, etc. are used as viscosity modifiers (thickeners), such as inorganic silicon and calcium oxides and carbonates, organic substances such as polymers such as vinyl pyrrolidone, acrylic acid, and rubber latex. is ammonia water, etc.

In addition, in order to prevent the adhesive coating film from adhering to the non-coated surface of the base material and causing blocking, it is necessary to use a wetting agent in the coating suitability. , it would not be possible to use it without imparting repellency or slipperiness.

Depending on the material used, it may not be necessary, but as anti-blocking agents, ultrafine powders of extender pigments such as synthetic silicates, ploidal silica, and sericite (mica) and their dispersions can be used. Liquids, fluorine or silicone liquids used as water and oil repellents, or emulsions can be used.

The method of processing mutually adhesive tape using these raw materials is to color the base material by coloring the base material as a composition with a colorant together with a synthetic resin, or by applying a roll coater onto a film-like material.
The entire surface is coated using a knife coater, graphia roll coater, textile printing, etc., or a pattern is printed.

Coating of adhesive can be done using a single coater, knife coater,
This is carried out using an extrusion footer, etc., and non-proning processing is carried out by methods such as dipping, spraying, and coating as described above.

The mutual adhesive tape produced as described above is made of substances contained in the coating agent, such as extender pigments, the type of polymers to be blended, the composition itself, etc., and the surface of the adhesive. Due to the drying process and the non-boot-king process in some cases, the pressure-sensitive adhesive strength to the adherend is weaker than that of commonly used rubber-based (solvent-based) adhesive tapes. In the presence of moisture, general-purpose types are water-repellent and difficult to adhere to, but the product of this invention, which is mainly an emulsion, has good affinity with moisture and has good adhesion.

In the case of mutual adhesion, which attaches the surfaces of adhesive layers to each other, this material is stronger against "slippage" caused by pulling in the horizontal direction parallel to the tape surface than against peeling force, so that the intended use cannot be fully achieved. It will be done.

can.

In the case of the present invention, the rubber latex used as an auxiliary agent has adhesive performance of almost 1 g to the adherend, but it has a large degree of freedom (activity) in the adhesive layer and improves mutual adhesion. Depending on the type, synthetic resins used as auxiliary agents can exhibit mutual adhesion behavior, increase the adhesion of substrates, adjust viscosity, or improve fluidity. It promotes engineering aptitude.

In terms of suitability for use, for example, in the case of fishing lures, it may be used by cutting them to a predetermined size and bonding the surfaces of the adhesive layer, or it may be used on existing products, lures, or the bait itself. It is pasted and used as a marker in the presence of water.

In addition, when it comes to attaching and binding labels, fishing rods, and other items, general-purpose adhesive tapes have a strong peeling force, which may damage the adherend in some cases, and the adhesive may remain when peeled off, resulting in contamination or staining. However, this mutual adhesive tape does not cause such problems even when directly attached to two adherends, and since it has strong resistance to slippage, it can be put to practical use by bonding the ends of the tapes together.

The reason for coloring is for decorative purposes and for the display function to make it easier to distinguish even in dark places.

(g) Effects of the invention By using a synthetic resin emulsion with a relatively good affinity for moisture as the main ingredient and using a colored plastic film as a base material to make a mutually adhesive tape, it can be used when wet, and it is easy to adhere to it. 2.It does not damage the body or contaminate the body, improves decorativeness and display function, makes it easy to clearly identify where it is used, confirms the existence of the product, improves identification, and provides safety information. It is possible to improve the usage and usability.

Claims (1)

[Scope of Claims] 1. A plastic film that has been colored or printed and has good coating suitability is used as a base material, and on top of this, as an adhesive,
A composition made of a synthetic resin emulsion having ester bonds, ether bonds, and similar bonds as a main ingredient is coated and dried, and the non-coated surface of the substrate that this formed film layer comes into contact with becomes non-blocking. Mutual adhesive tape for use when wet. 2. As an adhesive, the polymer composition contains 50% or more of a synthetic resin emulsion having ester bonds, ether bonds, and similar bonds as a main component, and contains similar or different types as an auxiliary agent. 2. The mutual adhesive tape for wet use according to claim 1, characterized in that the tape contains a synthetic resin emulsion of 50% or less, or a latex such as natural rubber or synthetic rubber in an amount of 50% or less. 3. Claim 1, characterized in that, as a coloring agent for the base plastic film, a functional pigment or a general-purpose pigment suitable for the synthetic resin and processing, such as fluorescence, luminescence, thermosensitivity, etc., is used as the coloring agent for the plastic film that is the base material. Mutual adhesive tape for wet use as described in section.