JP2657222B2 - Paint composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating composition and, more particularly, to a chlorinated rubber-based coating composition which is frequently used in heavy-duty anticorrosive paints, inks or adhesives for outdoor buildings.

[0002]

2. Description of the Related Art Chloride rubber is a natural rubber, a synthetic rubber or the like (simply referred to as rubber) such that the chlorine content is 60% by weight or more.
Is a chlorinated rubber, and when it is dissolved in an organic solvent to form a coating, not only is the coating workability such as brush painting, spray coating or dip coating good, but it is also quick-drying.
Excellent in acid resistance, alkali resistance, water resistance, seawater resistance, chemical resistance and weather resistance of the coating film, so it is used for heavy anticorrosion paints for ships, bridges, tanks, containers, etc., inks or adhesives, etc. ing.

[0003] In this case, a chlorinated rubber is used alone as the chlorinated rubber-based paint, or a synthetic resin such as an alkyd resin is blended and used, and an organic solvent such as toluene is used as a solvent. Generally, such a chlorinated rubber is industrially produced by reacting the rubber with chlorine in a chlorine-based solvent (reaction solvent) such as carbon tetrachloride which is inert to chlorine.

[0004] However, although chlorinated rubber is excellent in weather resistance and the like, it is inferior in adhesiveness as compared with paints using epoxy resin or urethane resin and the like. There is a drawback that it is necessary to select also about. In addition, since carbon tetrachloride, which is mainly used as a reaction solvent when producing chlorinated rubber, is a substance that destroys the ozone layer, it is presumed that it will not be possible to use it in the future.

Further, since a chlorinated solvent such as chloroform is toxic, when used as a reaction solvent, there is a drawback that the production environment is deteriorated. As a method of solving such a defect, a method of chlorinating rubber in an aqueous medium has been proposed (Japanese Patent Application Laid-Open Nos. 4-36303 and 4-469).
No. 05). The present inventors have also proposed a method for producing chlorinated rubber by chlorinating rubber latex in an aqueous medium (Japanese Patent Laid-Open No. 4-59801), and have also proposed a chlorinated rubber having excellent adhesiveness.

[0006]

When the above-mentioned chlorinated rubber is used for paints, a large amount of a volatile organic solvent such as toluene is used as described above in order to improve the coating operation. Therefore, there was a disadvantage that the air was polluted. Therefore, if the amount of the organic solvent used to reduce air pollution is reduced, the amount of solid content contained in the paint becomes too large (high solid differentiation), and the viscosity of the paint becomes high. Workability deteriorates. Further, when a chlorinated rubber having a small molecular weight is used to prevent an increase in the viscosity of the coating material, there is a disadvantage that the performance as the coating material is reduced.

The inventors of the present invention have conducted intensive studies to solve the above-mentioned drawbacks. As a result, when a specific chlorinated rubber and a specific compound are used as main components of a coating composition and a cured film is formed, The present inventors have found that good results can be obtained, and arrived at the present invention. Therefore, the object of the present invention is to
An object of the present invention is to provide a coating composition which is excellent in adhesiveness, weather resistance and environmental properties, and which can be highly solidified.

[0008]

SUMMARY OF THE INVENTION The above objects of the present invention are as follows.
A chlorinated rubber chlorinated in an aqueous medium, having a chlorine content of 60 to 72% by weight, a weight average molecular weight of 5,000 to 500,000, and an absorbance ratio defined by the following formula 2 of 3 or more: A coating composition comprising (A) and a compound (B) having two or more isocyanate groups in one molecule and / or a compound (C) having two or more epoxy groups in one molecule as main components. Accordingly, the present invention has been attained by a coating composition characterized in that the chlorinated rubber (A) and the compound (B) and / or (C) can form a cured film by a crosslinking reaction.

[0009]

(Equation 2) The absorbance at 2970 cm ⁻¹ in Equation 2 represents the abundance of a bond (C—H) between a carbon atom and a hydrogen atom, and
The absorbance at cm ^-1 is determined by the bond between oxygen and hydrogen atoms (O
-H). Therefore, the larger the absorbance ratio represented by Equation 2 is, the higher the proportion of (OH) in the chlorinated rubber becomes. Adhesion). Book
Absorbance in the invention was measured by a solution method
What is (Analysis of instrument analysis)
(1), p. 5). For example, Japan
Use IR-REPOROT 100 manufactured by Spectroscopic Co., Ltd.
Can be. In this case, the chlorinated rubber powder of the present invention
Is dissolved in carbon tetrachloride, and this solution is poured into a fixed cell.
Perform the measurement. The measurement temperature is room temperature.

If the absorbance ratio is 3 or less, the adhesiveness of the paint film becomes insufficient, which is not preferable. The absorbance ratio of the chlorinated rubber can be easily adjusted by the method described later. The chlorine content of the chlorinated rubber used in the present invention is:
If it is less than 60% by weight, it is difficult to dissolve it in an organic solvent, and if it is more than 72% by weight, the efficiency of chlorination deteriorates.

[0011] The weight average molecular weight of the chlorinated rubber used in the present invention is in the range of 5,000 to 500,000, preferably in the range of 5,000 to 100,000. When the weight average molecular weight is less than 5,000, the cohesive force between the molecules decreases, so that the viscosity of the paint decreases, and the workability of the coating improves, but the performance such as adhesion and weather resistance is improved. Worsens. On the other hand, if it exceeds 500,000, the viscosity when dissolved in an organic solvent becomes too high, so that it cannot be used for paints.

When a material having a large weight average molecular weight is used, the performance of the coating material is improved, but it is difficult to reduce the amount of the organic solvent used in order to maintain coating workability. The weight average molecular weight can be easily measured by using gel permeation chromatography (GPC), and is represented by a molecular weight in terms of polystyrene.

[0013] The molecular weight of the chlorinated rubber can be adjusted by adjusting the molecular weight of the rubber latex to be used, by adjusting the temperature or the irradiation amount of ultraviolet rays during the chlorination reaction, or by adding a radical generator. It can be easily performed by accelerating the chlorination reaction. The chlorinated rubber used in the present invention is produced by chlorinating a rubber latex in an aqueous medium.

Although the rubber latex is not particularly limited, it is chlorinated uniformly, and toluene, xylene,
From the viewpoint of obtaining a chlorinated rubber having good solubility in organic solvents such as methyl ethyl ketone and ethyl acetate, it is preferable to use natural rubber latex or synthetic polyisoprene rubber latex, and it is particularly preferable to use natural rubber latex. Incidentally, rubber latex includes those obtained by depolymerizing rubber latex. The molecular weight of the rubber latex used is preferably in the range of 10,000 to 2,000,000.

In the present invention, as a rubber latex, a powdery or granular rubber (for example, Hyflo:
Golden Hope Plantation BH
on BHD) may be used. When powder rubber or the like is used, from the viewpoint of obtaining a chlorinated rubber having a uniform solubility in an organic solvent, it is preferable to use a rubber having a small particle diameter capable of uniformly performing a chlorination reaction.

Chlorination of the rubber latex in an aqueous medium can be easily performed by using a known method. That is, if chlorine is blown directly into natural rubber latex, the rubber solidifies and it becomes difficult to chlorinate, and in order to prevent this, a nonionic surfactant or a cationic surfactant is added to the rubber solid content. About 2 to 5% by weight based on the weight is added to the aqueous medium.

As a synthetic polyisoprene rubber latex, a commercially available synthetic polyisoprene rubber latex (for example, Maxprene IR-900: trade name of Sumitomo Seika Co., Ltd.) or a synthetic polyisoprene rubber is emulsified. When a latex is used, if the surfactant used in the emulsification is a nonionic surfactant or a cationic surfactant, it is left as it is, and if the surfactant is an anionic surfactant, Can be easily chlorinated by adding a nonionic surfactant.

Examples of the nonionic surfactant include polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene alkyl ester, sorbitan alkyl ester, and polyoxyethylene sorbitan alkyl ester. Examples of the cationic surfactant include an aliphatic amine salt, a quaternary ammonium salt thereof, and a heterocyclic quaternary ammonium salt.

The latex concentration in the chlorination reaction is 1
It is preferably from 15 to 15% by weight, especially from 2 to 8% by weight. If it is less than 2% by weight, the reaction rate will be low, and if it exceeds 8% by weight, the viscosity will increase in the latter stage of the reaction and the reaction rate will be low. The temperature of the chlorination reaction is preferably in the range of 10 to 90 ° C., particularly preferably 20 to 70 ° C. It is preferable to carry out the reaction at a low temperature in the early stage and to raise the temperature as the reaction proceeds.

In the latter half of the reaction, it is preferable to irradiate the reaction system with ultraviolet rays from the viewpoint of increasing the reaction rate or increasing the molecular weight. In this case, it is preferable to use a high-pressure mercury lamp as the ultraviolet light source. The chlorinated rubber used in the present invention, wherein the absorbance ratio defined by the formula 2 is 3 or more, can be easily obtained by, for example, the method shown below. It is preferable to use the first method.

1. A method of adding an appropriate amount of hydrochloric acid when chlorinating rubber latex. 2. A method in which air, oxygen, ozone, or the like is blown into the reaction system before, during, or after the chlorination reaction.

In the first method, a competitive reaction between a chloronium ion generated as an intermediate when a double bond of the rubber latex undergoes an addition reaction with chlorine and a hydroxy ion accompanying the presence of water is carried out by hydroxylating with hydrochloric acid. The reaction is controlled by suppressing the reaction, whereby the absorbance ratio is adjusted. Absorbance ratio of 3 by the above method
In order to obtain the above chlorinated rubber, the amount of hydrochloric acid added may be adjusted so that the concentration becomes 0.1 to 8 mol / l, and the absorbance ratio increases as the hydrochloric acid concentration decreases.

In the second method, since a part of the rubber latex is oxidized by the introduced air or the like, the absorbance ratio is adjusted by adjusting the amount of the introduced air or the like.

The chlorination reaction of rubber latex in an aqueous medium can be easily carried out using a known reaction apparatus having a stirrer and a jacket, and having a reaction vessel having a glass-lined inside. In the chlorination reaction, an antifoaming agent,
A radical generator and other known additives can be appropriately added. The reaction product thus obtained is
Since the suspension is in the form of a suspension having a particle diameter of several tens of μm, it can be washed with water, neutralized and dried to obtain a white, finely powdered chlorinated rubber.

Next, a compound having two or more isocyanate groups in one molecule used in the present invention and two or more isocyanate groups in one molecule are used.
The compound having two or more epoxy groups will be described.
Incidentally, these compounds may be resins. Examples of the compound having two or more isocyanate groups in one molecule (hereinafter, simply referred to as an isocyanate compound) include, for example, aromatic, aliphatic or alicyclic diisocyanates, or homopolymers or copolymers thereof. Examples thereof include tolylene diisocyanate (TDI),
4,4'-diphenylmethane diisocyanate (MD
I), xylylene diisocyanate (XDI), naphthalene diisocyanate (NDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), hydrogenated XDI, hydrogenated MDI and the like.

The above compounds may be used alone or in combination of two or more. In view of low toxicity to the human body and easy handling, the trimethylolpropane adduct of these compounds, It is preferable to use a ret body or an isocyanurate body. In the present invention, the compound having two or more isocyanate groups in one molecule includes a resin having two or more isocyanate groups in one molecule, such as a urethane resin having two or more free isocyanate groups, phenol and ε. -A blocked isocyanate compound in which an isocyanate group is blocked with caprolactam or the like is also included.

In the present invention, from the viewpoint of accelerating the crosslinking reaction between the isocyanate compound and the chlorinated rubber, organic metals such as dibutyltin dilaurate (DBTDL) and zinc octylate, triethylamine, triethylenediamine, N-methylmorpholine May be added as a catalyst. Compounds having two or more epoxy groups in one molecule (hereinafter, simply referred to as epoxy compounds) used in the present invention include bisphenol A type,
Examples include epoxy compounds such as bisphenol F type, glycidyl ether type of polyhydric alcohol, phenol novolak type, glycidyl ester type, and alicyclic epoxy compound. These may be used alone or in combination of two or more.

The compound having two or more epoxy groups in one molecule in the present invention also includes an epoxy resin such as a glycidyl methacrylate copolymer. Bisphenol type epoxy compounds include, for example, Epicoat (trade name of Yuka Shell Epoxy Co., Ltd.), and glycidyl ether type compounds include ethylene glycol glycidyl ether, propylene glycol glycidyl ether, glycerol polyglycidyl ether, and sorbitol polyglycidyl. Ether and the like.

In the present invention, a catalyst such as a tertiary amine such as triethylamine, 1,8-diaza-bicyclo-undecene-7, or a basic substance is used from the viewpoint of accelerating the crosslinking reaction between the epoxy compound and the chlorinated rubber. May be added. In the present invention, it is preferable to prepare a coating composition by mixing a chlorinated rubber dissolved in an organic solvent and an isocyanate compound and / or an epoxy compound at the time of use, that is, mixing them as a two-pack type at the time of use. When a compound having a protected isocyanate group, such as a blocked isocyanate compound, is used, it may be a one-pack type mixed in advance.

The mixing ratio of the isocyanate compound and / or the epoxy compound to the chlorinated rubber is 10% by weight.
The ratio is preferably from 0: 0.5 to 100: 80. Although the concentration of the solid content in the case of the coating composition may be low,
It is preferable to set it in the range of 0 to 80% by weight. Solvents that can be used in the coating composition of the present invention include toluene, aromatic solvents such as xylene, petroleum solvents such as solvent naphtha, ethyl acetate, low molecular weight ester solvents such as butyl acetate, methyl ethyl ketone, Examples thereof include ketone solvents such as methyl isobutyl ketone, and solvents using a hydrocarbon solvent such as hexane or cyclohexane in combination with these solvents. To the coating composition of the present invention, resins such as alkyd resin and petroleum resin, boil oil, reactive diluent and the like can be added. Also, as appropriate, pigment, plasticizer,
Coating additives such as stabilizers, thixotropic agents, and leveling agents may be used.

[0031]

The coating composition of the present invention is mainly composed of a chlorinated rubber having excellent adhesiveness and curing reactivity, and uses a compound which undergoes a cross-linking reaction. In addition to excellent properties, it is possible to use a low molecular weight chlorinated rubber, and to reduce the amount of an organic solvent at the time of coating, thereby enabling high solid differentiation. Also,
Since the coating composition of the present invention uses a chlorinated rubber manufactured without using a chlorinated solvent such as carbon tetrachloride, it can deteriorate not only the manufacturing environment but also the global environment such as air pollution. Absent.

[0032]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto. Production example of chlorinated rubber

Production Example 1 In a container, a natural rubber latex (high ammonia type having a rubber content of 60% by weight: Soctex-C
C): 2 kg of a nonionic surfactant (Emanon 319) (trade name, manufactured by SOCFIN CO.)
9: Trade name (manufactured by Kao Corporation) 40 g and 49 liters of water were added and stirred, and then a 35% by weight concentrated hydrochloric acid aqueous solution 1 was added.
One liter was added.

The obtained mixed solution was charged into a 50-liter reaction vessel equipped with a stirrer, a high-pressure mercury lamp, a thermometer, a waste gas outlet and a gas inlet, and the inside of which was glass-lined, and provided at the bottom of the reaction vessel. Chlorine gas was blown from the gas inlet, and the reaction was performed at 30 ° C. for 5 hours in a dark place. Next, a high-pressure mercury lamp was turned on to irradiate ultraviolet rays to gradually raise the temperature of the reaction system to 70 ° C., and chlorine gas was blown in for 8 hours to obtain a reaction product liquid.

The resulting reaction solution was filtered and neutralized, washed with water and dried to obtain a white fine powdery chlorinated rubber. From the results of the infrared spectroscopic analysis and the GPC elution curve, it was confirmed that the obtained chlorinated rubber had a chlorine content of 66% by weight, an absorbance ratio of 28, and a weight average molecular weight of 35,000.
Incidentally, when the obtained chlorinated rubber was dissolved in toluene,
The chlorinated rubber dissolved easily.

Production Example 2 Except that 49 liters of water used as a nonionic surfactant and 1 liter of a 35% by weight concentrated aqueous hydrochloric acid solution used in Production Example 1 were changed to 42 liters and 8 liters, respectively.
To obtain a salt of rubber in the same manner as in Production Example 1. From the results of the infrared spectroscopic analysis and the GPC elution curve, it was confirmed that the obtained chlorinated rubber had a chlorine content of 67% by weight, an absorbance ratio of 15, and a weight average molecular weight of 85,000. still,
When the obtained chlorinated rubber was dissolved in toluene, the chlorinated rubber was easily dissolved.

Production Example 3 Chlorine was produced in exactly the same manner as in Production Example 1, except that synthetic polyisoprene rubber latex (Maxprene IR-900: trade name of Sumitomo Seika Co., Ltd.) was used instead of the natural rubber latex used in Production Example 1. A chlorinated rubber having a content of 68% by weight was obtained. From the results of the infrared spectroscopic analysis and the GPC elution curve, it was confirmed that the obtained chlorinated rubber had a chlorine content of 68% by weight, an absorbance ratio of 36, and a weight average molecular weight of 8,000. When the obtained chlorinated rubber was dissolved in toluene, the chlorinated rubber was easily dissolved.

Production Example 4 49 liters of water used as the nonionic surfactant used in Production Example 1 and 35% by weight
1 liter of concentrated hydrochloric acid aqueous solution of 20 liters and 30 liters respectively
Except for changing to liter, a chlorinated rubber was obtained in exactly the same manner as in Production Example 1. From the results of the infrared spectroscopic analysis and the GPC elution curve, it was confirmed that the obtained chlorinated rubber had a chlorine content of 68% by weight, an absorbance ratio of 5, and a weight average molecular weight of 65,000. When the obtained chlorinated rubber was dissolved in toluene, the chlorinated rubber was easily dissolved.

Production Example 5 Instead of the natural rubber latex used in Production Example 1, the liquid <br/> port polyisoprene rubber: the (Kuraprene LIR-30 manufactured by Kuraray K.K.) was heated to 90 ° C., nonionic surfactant (EMANON 3199: high-speed stirring was performed using a homomixer while adding water containing Kao Corporation (trade name). Using the obtained rubber latex without using a nonionic surfactant, water and a 35% by weight concentrated hydrochloric acid aqueous solution were changed to 42 liters and 8 liters, respectively, in exactly the same manner as in Production Example 1, except that To obtain a chlorinated rubber.

From the results of infrared spectroscopic analysis and GPC elution curve, it was confirmed that the obtained chlorinated rubber had a chlorine content of 67% by weight, an absorbance ratio of 12, and a weight average molecular weight of 4,000. When the obtained chlorinated rubber was dissolved in toluene, the chlorinated rubber was easily dissolved.

Production Example 6 50 liters the inner surface reaction vessel Garasuraini in g, natural rubber (No. RSS1: Mooney viscosity 50) 2 kg
And 40 liters of carbon tetrachloride were charged and dissolved at 75 ° C. A chlorine gas was blown into the resulting solution at 75 ° C. from a gas inlet provided at the bottom of the reaction vessel while a high-pressure mercury lamp was turned on and irradiated with ultraviolet rays, and reacted for 15 hours to obtain a reaction product liquid. .

After steam-distilling the obtained reaction product liquid,
After drying, a powder of a chlorinated rubber was obtained. Infrared spectroscopy and GP
From the results of the C elution curve, the obtained chlorinated rubber had a chlorine content of 68% by weight, an absorbance ratio of 2, and a weight average molecular weight of 3
It was confirmed to be 5,000. When the obtained chlorinated rubber was dissolved in toluene, the chlorinated rubber was easily dissolved.

Embodiments 1-4. To 100 parts of each of the chlorinated rubbers obtained in Production Examples 1 to 4, 45 parts of chlorinated paraffin (A-40: trade name, manufactured by Tosoh Corporation) and titanium dioxide (R-
820: 125 parts (trade name, manufactured by Ishihara Sangyo Co., Ltd.), 2.5 parts of a stabilizer and an appropriate amount of xylene were added, and kneaded using a sand mill to prepare each white paint. Next, an isocyanate compound (Desmodur N
3390: 5 parts of Bayer Co., Ltd.) and 0.08 part of dibutyltin dilaurate (catalyst) were added to obtain coating compositions of Examples 1 to 4 of the present invention.

Each of the obtained coating compositions had a viscosity of 72 ± 2.
Each paint was obtained by adding xylene so as to obtain ku. Each of the obtained paints was subjected to sandblasting and then applied to a steel piece undercoated with an epozinc paint, and a steel piece not undercoated to prepare test pieces for performance test and adhesion (adhesion) test, respectively. The test was performed as follows. Table 1 shows the results
As shown in FIG. The concentration of the solid content of the paint is as shown in Table 1.

Performance Test Adhesiveness (cross-cut test) Cuts that reach the substrate using a cutter are cut vertically and horizontally at intervals of 2 mm on the coating surface of the test piece using a cutter so that there are 100 cross-cuts. After the cellophane pressure-sensitive adhesive tape was adhered to the eyes, the adhesive tape was peeled off at an angle of 180 ° with respect to the coating film surface, and the number of eyes remaining without peeling the coating film was counted to evaluate the adhesiveness.

2. Hardness was performed by pencil hardness. 3. Flex resistance Using a mandrel with 1/2 inch diameter, 18
This was done by bending to an angle of 0 °. 4. Impact resistance The test was performed by dropping a hard sphere having a diameter of 1/2 inch and a load of 500 g using a DuPont impact tester.

5. Brine spraying A 5% by weight aqueous solution of sodium chloride at 35 ° C. was sprayed onto the coating surface of the test piece for 30 days, and the coating surface was visually observed. 6. Moisture resistance The test specimen was placed in an atmosphere at 50 ° C. and 100% relative humidity for 30 minutes.
After standing for a day, the coating film surface was visually observed. 7. Alkali Resistance After the test piece was immersed in a 3% by weight aqueous solution of sodium hydroxide for 30 days, the surface of the coating film was visually observed.

8. The accelerated weather resistance test piece was measured using a sunshine weather meter (WEL-S).
UN type: Suga Test Machine Co., Ltd.
After a period of time, the glossiness of the coating film surface was measured and evaluated in%. The results of the visual observation were as follows: ：: good, Δ:
Slightly inferior, ×: Inferior in three grades.

Comparative Example 1 Except that the isocyanate compound and dibutyltin dilaurate were not used, a coating material was prepared exactly in the same manner as in Example 1, a test piece was prepared, and a test was performed exactly as in Example 1. The results are as shown in Table 1. The concentration of the solid content of the paint is as shown in Table 1.

Comparative Examples 2 and 3 Except for using the chlorinated rubbers obtained in Production Examples 5 and 6, respectively, a coating material was prepared exactly in the same manner as in Example 1, test pieces were prepared, and a test was conducted exactly in the same manner as in Example 1. The results are as shown in Table 1.
The concentration of the solid content of the paint is as shown in Table 1.

[0051]

[Table 1]

Embodiments 5 to 8 Instead of the isocyanate compound and dibutyltin dilaurate used in Example 1,
Except for using 5 parts of an epoxy compound (Epototo YH-300: trade name, manufactured by Toto Kasei Co., Ltd.), a coating material was prepared in exactly the same manner as in Example 1, a test piece was prepared, and exactly as in Example 1. The test was performed. The results are as shown in Table 2. The solid content of the paint is as shown in Table 2.

Embodiment 9 FIG. In addition to 2.5 parts of the isocyanate compound (Desmodur N3390: trade name manufactured by Bayer Corporation) and 0.04 part of dibutyltin dilaurate (catalyst) used in Example 1, an epoxy compound (Epototo YH-300: Toto) (Product name of Kasei Co., Ltd.)
Except for the addition of 2.5 parts, a coating material was prepared and a test piece was prepared in exactly the same manner as in Example 1, and a test was performed exactly as in Example 1. The results are as shown in Table 2. still,
The solid content of the paint is as shown in Table 2.

Comparative Examples 4 and 5. Instead of the isocyanate compound and dibutyltin dilaurate used in Example 1,
Except for using 5 parts of an epoxy compound (Epototo YH-300: trade name, manufactured by Toto Kasei Co., Ltd.), a coating material was prepared in exactly the same manner as in Comparative Example 2, a test piece was prepared, and exactly the same as in Example 1. The test was performed. The results are as shown in Table 2. The solid content of the paint is as shown in Table 2.

[0055]

[Table 2]

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location C08G59 / 18 NJQ C08G59 / 18 NJQ C09D 5/08 PPX C09D 5/08 PPX PPY PPY C09J 115 / 02 JDQ C09J 115/02 JDQ (56) References JP-A-49-48780 (JP, A) JP-A-61-255937 (JP, A) JP-A-50-114493 (JP, A) JP-A 63-48 265883 (JP, A) JP-A-4-59801 (JP, A) JP-A-4-46905 (JP, A) JP-A-4-36303 (JP, A) JP-A-51-16391 (JP, A) JP-A-6-108003 (JP, A) JP-A-6-108004 (JP, A) Patent 2551894 (JP, B2)

Claims (3)

(57) [Claims] An aqueous medium having a chlorine content of 60 to 72% by weight, a weight average molecular weight of 5,000 to 500,000 and an absorbance ratio defined by the following formula 1 of 3 or more: Chlorinated rubber (A), compound (B) having two or more isocyanate groups in one molecule and / or compound (C) having two or more epoxy groups in one molecule
And a cross-linking reaction between the chlorinated rubber (A) and the compound (B) and / or (C) to form a cured film. Stuff. (Equation 1) 2. The coating composition according to claim 1, comprising a chlorinated rubber (A), a compound (B) and a compound (C). 3. The chlorinated rubber (A) is a chlorinated rubber obtained by chlorinating a natural rubber latex in an aqueous medium.
3. The coating composition according to item 1.