JPH0370787A - Adhesive composition - Google Patents

Abstract

PURPOSE:To obtain an adhesive composition having high adhesion-imparting property with a slight danger of fire or environment pollution by a mixing chloroprene latex with a cumarone-indene resin emulsion. CONSTITUTION:(A) 100 pts.wt. chloroprene latex is mixed with (B) 10-90 pts.wt. (preferably 30-70 pts.wt.) cumarone-indene resin emulsion containing 1-15wt.% cumarone and 50-90wt.% indene preferably as monomer components to afford the objective composition. Besides, preferably the cumarone-indene resin is mixed with 10-100wt.% plasticizer and 0.5-15wt.% emulsifier and heated together with water, then stirred to obtain the component B.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to chloroprene adhesive compositions.

[Conventional technology]

Emulsions of hydrocarbon resins such as petroleum resins, terpene resins, and rosin are used as adhesion agents for adhesives and paints, but the resins themselves have advantages and disadvantages, and although their modification effects are sufficient, do not have.

For example, JP-A-52-93445 describes an adhesive made of chloroprene latex and a petroleum resin-ethylenic unsaturated carboxylic acid adduct, but this adhesive contains a relatively large amount of organic solvent. There is a problem in that the adhesive strength is not sufficient.

[Problem to be solved by the invention]

An object of the present invention is to provide an adhesive composition that provides high adhesiveness to chloroprene latex. Another object is to provide a chloroprene adhesive that poses less risk of fire and environmental pollution.

[Means to solve the problem]

The present invention is an adhesive composition comprising a coumaron-indene resin emulsion mixed with chloroprene latex.

Coumarone-indene resin is a hydrocarbon resin obtained by copolymerizing gas light oil produced during carbonization of coal or tar light oil obtained by distilling coal tar as a raw material with an acid solvent. The raw material gas oil is usually 130 to 200
℃ fraction, and contains aromatic olefins such as coumaron, indene, and styrene as polymerizable components. Among the polymerizable components, coumarone is often 1 to 15% by weight, indene is 50 to 90% by weight, and styrene,
There is no problem even if it contains vinyltoluene, phenol, etc.

Acid catalysts used include Brønsted acids such as sulfuric acid, phosphoric acid, hydrochloric acid, and nitric acid, boron trifluoride or its complexes, Lewis acids such as aluminum chloride, and solid acids such as activated clay and acidic ion exchange resins. The amount used varies depending on other conditions, but in the case of Brønsted acid, it is 1 to 10% by weight.
However, in the case of a Lewis acid, it is preferably 0.5 to 2% by weight, and in the case of a solid acid, it is preferably 5 to 50% by weight. Reaction temperature is 50-150℃
The reaction time is preferably about 0.5 to 7 hours.

After the polymerization is completed, the catalyst is decatalyzed and the solvent or unreacted hydrocarbon is evaporated to obtain a coumaron-indene resin.

The malon-indene resin suitable for the present invention has a molecular weight of 50.
0 to 2000, and the softening point is 60 to 150.
It is about ℃. Furthermore, if the terminal end is a compound having a hydrophilic group such as phenol, polarity is imparted and affinity with water increases.

An emulsion of coumaron-indene resin is obtained by vigorous stirring together with an emulsifier and water. Preferably, 10 to 100% by weight of a plasticizer and 0.5 to 15% by weight of an emulsifier are added to the coumaron-indene resin and heated with water;
Obtained by stirring. Furthermore, preferably, less than 20% by weight, preferably 2 to 10% by weight, of an organic solvent is added to the coumaron-indene resin and dissolved therein, and then mixed with water in which an emulsifier is dissolved, followed by heating and stirring. . When a plasticizer is used, commonly used plasticizers such as phthalate esters such as dioctyl phthalate and dibutyl phthalate can be used.

Emulsifiers include nonionic, anionic, and cationic surfactants, water-soluble polymers called polysoap, and water-soluble polymers used as protective colloid agents, and one or more of these may be used. . The amount of emulsifier used is as described above, but preferably 2 to 5% by weight. Adding too much emulsifier will adversely affect water resistance and adhesion.

When using an organic solvent, any organic solvent can be used as long as it dissolves the coumaron-indene resin, such as toluene, xylene, and the like.

The amount to be used is as described above, but if it is too large, it will not only cause problems under the Fire Service Act, but also cause problems with odor, heat-resistant adhesive strength, etc.

The solid content concentration in the coumaron-indene resin emulsion is 35
The content is preferably 60% by weight. This coumaron-indene resin emulsion is mixed with chloroprene latex to form an adhesive composition.

Chloroprene latex is an emulsified product of chloroprene polymer, and may contain an emulsifier, a stabilizer, etc., but preferably has a solid content concentration of 30 to 60% by weight.

The ratio of the chloroprene latex and the malon-indene resin emulsion is preferably 10 to 90 parts by weight, preferably 30 to 70 parts by weight, based on 100 parts by weight of the latex, and the composition as a whole is It is preferable that the solid content of chloroprene is 30 to 35% by weight, the solid content of coumaron-indene resin is 10 to 20% by weight, the plasticizer is 0 to 50% by weight, and the content of water and others is 30 to 60% by weight. Further, anti-aging agents, stabilizers, fillers, softeners, antifoaming agents, metal oxides, etc. may be added to this adhesive composition.

Mixing of the chloroprene latex and the coumaron-indene resin emulsion can be performed using a conventional stirrer. Since the mixing at this time involves mixing emulsions with each other, it is not only easy, but also causes almost no problems such as environmental pollution or fire outbreaks due to organic solvents.

[For production]

Since coumaron-indene resin is a compound having an aromatic ring, it inherently has a rigid structure. Therefore, it is thought that after the solvent evaporates, the structure rapidly returns to a rigid structure and exhibits excellent adhesive strength and heat resistance.

[Example] Examples of the present invention will be shown below. In the examples, parts represent parts by weight.

Examples 1 to 3 BF 0 (C
Polymerization was carried out using H3)2 catalyst, and three types of coumaron-
Indene resin was obtained. The amount of catalyst used was 1% by weight.

Table 1 shows the softening point and average molecular weight.

Add toluene in the amount shown in Table 2 to 100 parts of coumaron-indene resin, heat and dissolve, and then add about 4 parts of polyvinyl alcohol (molecular weight 1700, saponification rate 88%) to 100 parts of coumaron-indene resin.
A solution dissolved in 6 parts of water was added and stirred at high speed with a homomixer to obtain a coumaron-indene resin emulsion. The properties of this emulsion are shown in Table 2.

Chloroprene latex (manufactured by Showa Mini DuPont ■, neoprene 750, solid content 50 weight 96, average particle size 0.1
2 μm) to 100 parts of coumaron-indene resin emulsion
and 20 parts of Zn0-antiaging agent mixed solution (ZnO/aging inhibitor/aqueous surfactant 100/20/20) were mixed and stirred to prepare an adhesive composition.

The adhesive strength of the obtained adhesive composition was measured under the following conditions. The results are shown in Table 3.

Measurement conditions Two pieces of aluminum foil (125x25XO, 05
mm) using a #12 bar coater, the two sheets were bonded together and left at room temperature for 7 days, and this was used as a test piece of J I 5K6854T.
It was measured in accordance with the mold peeling test method. Here, the pulling speed was 200 mm/min, and the measurement atmosphere temperature was 25°C. The unit of adhesive force is g/25 mm.

Comparative Example 1 An adhesive composition was obtained in the same manner as in Example 1, except that the coumaron-indene resin emulsion was not blended.

The measurement results are shown in Table 3.

Comparative Examples 2 to 4 Adhesive compositions were prepared in the same manner as in Example 1, except that a terpene resin emulsion, a C5 petroleum resin emulsion, or a C9 petroleum resin emulsion was used instead of the coumaron-indene resin emulsion. I got something. The measurement results are shown in Table 3.

Table 1 Emulsions ASB or C are respectively coumaron-indene resin A
, B or C is emulsified.

Table 3 Table 2 〔Effect of the invention〕 The adhesive composition of the present invention has excellent adhesive strength.

Therefore, the chloroprene adhesive, which has been used in the adhesive field where oil resistance and solvent resistance are required, can now be used in fields where adhesive strength is required. Also,
Since the composition of the present invention can reduce the content of organic solvent, it can also be used in fields where safety and environmental hygiene problems are serious.

Claims (1)

[Claims] An adhesive composition comprising a coumaron-indene resin emulsion mixed with chloroprene latex.