JPS59172569A - Aerosol type spraying adhesive - Google Patents

Abstract

PURPOSE:To provide the titled adhesive which can form a good atomized state and gives a film having excellent adhesiveness, by blending a tackifier, an org. solvent and a propellant with an ehtylene/vinyl acetate copolymer contg. comonomers in a specified ratio. CONSTITUTION:An ethylene/vinyl acetate copolymer composed of 20-70wt% ethylene component and 80-30wt% vinyl acetate component, such as Evaflex 250 (a product of Mitsui polychemical K.K.), is used. 100pts.wt. said ethylene/ vinyl acetate copolymer, 5-200pts.wt. tackifier such as rosin derivative and an org-solvent such as toluene or ethyl acetate are mixed together. 25-85wt% resulting soln. and 75-15wt% propellant such as liquefied propane or dichlorodifluoromethane are filled in an aerosol container.

Description

[Detailed description of the invention] The present invention relates to an aerosol spray adhesive.

As is well known, ethylene-vinyl acetate copolymers with an ethylene copolymerization amount of 70% by weight or more are mainly used as raw materials for hot-melt adhesives and are widely used in the bookbinding and woodworking industries. ing. In addition, copolymers with an ethylene copolymerization amount of 20% by weight or less are mainly used as raw materials for emulsion-type adhesives, and are widely used for laminating soft vinyl chloride sheets and bonding resin-treated paper, etc. There is.

In order to apply the adhesive properties of these ethylene-vinyl acetate copolymers to an aerosol type adhesive, the present inventors
As a result of intensive research, it was discovered that an excellent aerosol type spray adhesive can be obtained by blending a tackifier, an organic solvent, and a propellant with a specific copolymerization ratio of ethylene-vinyl acetate copolymer. The invention was completed.

That is, in the present invention, 20 to 70% by weight of ethylene and 8
This invention relates to an aerosol type spray adhesive whose main components are an ethylene-vinyl acetate copolymer with 0 to 80% by weight of vinyl acetate, a tackifier, an organic solvent, and a propellant.

The ethylene-vinyl acetate copolymer used in the present invention contains 20 to 70% by weight of ethylene, but the above copolymers with such an ethylene content have rarely been used in the past. For example, it is only used to a small extent as a modifier for ink or a modifier for hot-melt adhesives.

In this case, the amount of ethylene must be 2
If it does not reach 0% by weight, the contact properties of the resulting adhesive film will be poor when spray applied as an adhesive, and the mixture with the organic solvent and propellant will be unstable and unsatisfactory. do not have.

The ethylene-vinyl acetate copolymer used in the present invention is soluble in organic solvents, exhibits appropriate rubber elasticity, and when an aerosol container is filled with an organic solvent solution together with a propellant and sprayed, a wide spray pattern area can be obtained. In other words, a well-atomized aerosol spray state is obtained, and the applied adhesive film exhibits excellent contact properties that are four times faster than those of elastomeric adhesives, and also has excellent adhesive properties. have.

The tackifier used in the present invention is used to obtain adhesive retention and good adhesive performance of the adhesive coating, and includes, for example, rosin derivatives, chirhenic resins, olefin or diolefin polymers, Examples include cyclopentadiene resin, phenolic resin, styrene resin, coumaron-indene resin, polyamide, etc. Other examples include alicyclic saturated hydrocarbon resin, aromatic hydrocarbon resin, alicyclic unsaturated hydrocarbon resin, etc. , these may be used alone or in combination of two or more. These tackifiers are used in an amount of about 5 to 200 parts by weight per 10 parts by weight of the ethylene-vinyl acetate copolymer.

The solvent used in the present invention may be any solvent as long as it can dissolve both the ethylene-vinyl acetate copolymer and the tackifier, such as aromatic hydrocarbons such as toluene and xylene, and n-hexane. , aliphatic hydrocarbons such as cyclohexane, chlorinated hydrocarbons such as methylene chloride, 1-1-1-trichloroethane, trichlorethylene, and acetone.

Examples include ketones such as methyl ethyl ketone, esters such as ethyl acetate, etc. In the present invention, these organic solvents may be used alone or in a mixture of two or more depending on the materials used or the purpose. .

Propellants used in the present invention include liquid propane gas, dimethyl ether, F-12 (dichlorodibroromethane)
, F-22 (monochlorodifluoromethane), F-14 (
(dichlorotetrafluoroethane), F-21 (dichloromono70lomethane), etc., and these alone or two
Use a mixture of more than one species.

The propellant used in the present invention is 75 to 1% by weight of the mixed solution of the ethylene-vinyl acetate copolymer, tackifier, and organic solvent used in the present invention.
Preferably, it is used in a proportion of 5% by weight.

The aerosol type spray adhesive of the present invention is prepared by dissolving the ethylene-vinyl acetate copolymer and tackifier in an organic solvent in a desired ratio, and filling this mixed solution together with a propellant into an aerosol container by a conventional method. and manufacture it. When the aerosol spray adhesive thus obtained is applied, a sufficiently atomized aerosol spray state with a wide aerosol spray pattern area is obtained, and the adhesive film has a contact property 19 of the elastomer adhesive. It exhibits excellent contact properties with four speeds and has good adhesion.

The aerosol spray adhesive obtained in the present invention can be used to bond various materials such as paper, cloth, plastic film, glass mat, glass wool, photographs, bosses, tars, metal foil, urethane foam, and wood. can. Furthermore, when applying an aerosol type spray adhesive, the adhesive can be applied uniformly over a wide area in a short time without getting the adhesive on your fingers, and it is easy to apply the adhesive to posters, the above-mentioned tube-covering materials, etc. It has the advantage of being able to be bonded.

EXAMPLES The present invention will be specifically explained below with reference to Examples and Comparative Examples. However, the present invention is not limited to these. In the following examples, parts refer to parts by weight unless otherwise specified.

An aerosol type spray adhesive was prepared in the following manner at the compounding ratio shown in Table 1.

Ethylene-vinyl acetate copolymer and "Ester Gum H" are dissolved in toluene in the proportions shown in Table 1. Next, the aerosol container was filled with the above mixed solution and liquid propane gas as a propellant in the proportions shown in Table 1 in a conventional manner.

(Materials used) *i Product name; r Evaflex 250 J (Mitsui Polychemical ■) *2 Product name; r Evaflex 15o" (Mitsui Polychemical ■) X8 Product name; "Evaflex 40J (Mitsui Polychemical) *4 Product name: [Solex BHJ (manufactured by Nippon Gosei Chemical Co., Ltd.) *5 Product name; [Solex DHJ (manufactured by Nippon Gosei Chemical Co., Ltd.) *6 Product name; [Solex FHJ (manufactured by Nippon Gosei Chemical Co., Ltd.) (manufactured by Kogyo ■) *7 Hydrogenated rosin glycerin ester (manufactured by Arayo Kagaku ■) The following characteristics were measured for each of the adhesives thus prepared.

Solubility in Solvent> The state when the ethylene-vinyl acetate copolymer resin was dissolved in an organic solvent together with a tackifier was observed, and the following judgments were made.

Judgment Criteria O; Completely dissolved x Partially dissolved or undissolved Sprayability> Observe the spray condition when each aerosol type spray adhesive is applied to the adherend (K liner paper) at a distance of approximately 20 cm, and then It was judged as follows.

Judgment criteria ○; Good atomized spray condition ×; Non-atomizable Adhesive Can Place each aerosol type spray adhesive about 20 cm apart.
Spray the adhesive to the adherend in an amount of about 10 of if liner paper or about 150 y of cotton canvas to adhere to per square meter. Room temperature (20°C) for 10 minutes after application
Leave it on and stick it together using acupressure. The adhesive area of the adherend is 2
．． 5cm width x 6. Measurements are made on the 7th day of adhesion at a tensile speed of 20 cm/min (measured with an autograph manufactured by Shimadzu Corporation).

(Unit: kf72.5 am width) The results of these determinations are shown in Table 2.

Table 2 Notes *l: Due to poor solubility, spray applicability was poor and adhesion tests could not be conducted.

*2: The spray condition was poor and contact properties were not developed.

As is clear from Table 2, Examples 1 to 4 of the present invention were
All tests showed good results.

However, in Comparative Example 1, in which the amount of ethylene copolymerized was more than 70% by weight, the solvent solubility was poor and the spray condition was also poor.

In addition, in Comparative Example 2, in which the amount of ethylene copolymerized was less than 20% by weight, the spray condition was poor, and the applied film did not show contact properties and had no adhesive strength.

Examples 5 to 7 In the same manner as Examples 1 to 4, aerosol type spray adhesives as shown in Table 8 were prepared using different organic solvents, tackifiers, and spray agents, and Examples 5 to 7 were prepared, respectively. And so.

Table 8 (Materials used) *8; Trade name; Narex BH (manufactured by Nippon Gosei Kagaku Kogyo ■) (vinyl acetate copolymerization amount: 55% by weight) *9; Polymerized rosin (manufactured by Percules ■) Examples 5 to 7 obtained All of the aerosol type spray adhesives had good solvent solubility, sprayability, and adhesive strength.

(that's all)

Claims (1)

[Claims] (2) An aerosol type spray adhesive whose main components are an ethylene-vinyl acetate copolymer of 20 to 70% by weight of ethylene and 80 to 80% by weight of vinyl acetate, a tackifier, an organic solvent, and a propellant.