JP2001207112A - Two-pack type coating composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a nonhalogenated composition for coating excellent in adhesion, water resistance and solvent resistance without using solvents. SOLUTION: This two-part type coating composition is composed of (1) a main ingredient comprising (A) a polyol component and (C) a chain extender and/or (D) a crosskicking agent as necessary and (2) a curing agent comprising (B) an organic polyisocyanate. The polyol component (A) contains a 3-40C aliphatic hydrocarbon in a side chain thereof, is composed of one or more of (A1) a polymeric polyol having 500-10,000 number-average molecular weight and has 5-80 wt.% content of the 3-40C aliphatic hydrocarbon in the side chain in the component (A).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a coating composition. More particularly, the present invention relates to a two-pack coating composition having excellent adhesion to a molded article of a polyolefin resin such as polypropylene.

[0002]

2. Description of the Related Art Conventionally, a coating composition having adhesion to a polyolefin resin composition has been known as a coating composition comprising a urethane resin and a chlorinated hydrocarbon resin (for example, chlorinated polypropylene) (for example, JP-A-60-1041).
No. 37), and a coating composition containing an acid-modified chlorinated product of a copolymer of propylene and ethylene with an α-olefin having 4 or more carbon atoms as an essential component (for example, JP-A-5-127).
No. 51) is known.

[0003]

However, since the above-mentioned coating composition contains a solvent, it causes air pollution and has a problem of solvent emission regulation. In addition, there is a problem that endocrine and dioxin are generated at the time of disposal. An object of the present invention is to provide a coating composition which exhibits excellent adhesiveness to a polyolefin resin molded article without using a solvent and is non-halogen, and has excellent solvent resistance and water resistance.

[0004]

Means for Solving the Problems The present inventors have made intensive studies on a coating composition which is solvent-free and non-halogen and has excellent adhesiveness, solvent resistance and water resistance, and as a result, the present invention has been achieved.

That is, the present invention provides the following polyol component (A) and, if necessary, a chain extender (C) and a crosslinking agent (D).
(1) comprising an organic polyisocyanate (B)
And a curing agent (2). Polyol component (A): contains an aliphatic hydrocarbon side chain having 3 to 40 carbon atoms, and has a number average molecular weight of 500 to 10,000.
(A1) comprising at least one polymer polyol (A1)
When the content of the aliphatic hydrocarbon side chain having 3 to 40 carbon atoms is 5
A polyol component which is 〜80% by weight.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The aliphatic hydrocarbon group having 3 to 40 carbon atoms in the polymer polyol (A1) in the base material (1) is a straight-chain, branched or alicyclic, saturated or An unsaturated hydrocarbon group is mentioned, and a preferable one is a linear or branched saturated hydrocarbon group.

The following (a1) to (a5) are examples of compounds that give a side chain of an aliphatic hydrocarbon group in the polyol for obtaining (A1). (A1) a 1,2-alkanediol having 5 to 42 carbon atoms:
1,2-hexanediol, 1,2-octanediol, 1,2-decanediol, 1,2-dodecanediol, 1,2-octadecanediol, etc. (a2) Glycerin monoalkyl ether having 6 to 43 carbon atoms: glycerin Monohexyl ether, glycerin monooctyl ether, glycerin mono-2-ethylhexyl ether, glycerin monodecyl ether, glycerin monododecyl ether, glycerin monooctadecyl ether, etc. (a3) Glycerin fatty acid monoester having 7 to 44 carbon atoms: glycerin hexanoate mono Esters, glycerin octanoic acid monoester, glycerin-2-ethylhexanoic acid monoester, glycerin decanoic acid monoester,
(A4) Alkylamine having 3 to 40 carbon atoms: butylamine, hexylamine, 2-ethylhexylamine, octylamine, dodecylamine, stearylamine, etc. (a5) C5 to 5 carbon atoms 42 α-olefin oxides:
α-decene oxide, α-dodecene oxide, α-
Octadecene oxide, etc.

The 1,2-alkanediol (a1) and α-olefin oxide (a5) can be produced by a known method such as a method of reacting α-olefin with acetic acid and hydrogen peroxide in the presence of an acid catalyst. Glycerin alkanol monoether (a2) can be produced by, for example, a method of reacting a long-chain alkyl alcohol with epichlorohydrin and then hydrolyzing it; a method of reacting glycerin with an alkyl halide. Glycerin fatty acid monoester (a3) can be produced by a method of esterifying glycerin and a fatty acid in the presence of an alkali catalyst.

Examples of (A1) obtained by using the above (a1) to (a5) include the following (A11) to (A11).
(A15). (A11) A 1,2-alkanediol having 5 to 42 carbon atoms (a1), a glycerin monoalkyl ether having 6 to 43 carbon atoms (a2) or a glycerin fatty acid monoester having 7 to 44 carbon atoms (a3), A polyether diol obtained by adding 2 to 4 alkylene oxides (b). (A12) Alkylene oxide having 2 to 4 carbon atoms (b) is 2 to 10 alkylamine (a4) having 3 to 40 carbon atoms.
(A13) A polyether diol obtained by adding an alkylene oxide (b) having 2 to 4 carbon atoms to an α-olefin oxide (a5) having 5 to 42 carbon atoms. (A14) (a1), (a2), (a3), (A1
1) A polyester diol obtained by polycondensing a diol component comprising at least one diol selected from the group consisting of (A12) and (A13) with a dicarboxylic acid (c). (A15) (a1), (a2), (a3), (A1
1) A polylactone diol obtained by adding a lactone monomer (d) to a diol component comprising at least one diol selected from the group consisting of (A12) and (A13). Of these, (A14) and (A15) are preferred because they have excellent oil resistance.

The alkylene oxide (b) having 2 to 4 carbon atoms used in (A11) and (A12) is ethylene oxide (hereinafter referred to as EO), propylene oxide (hereinafter referred to as PO), butylene oxide, or a mixture thereof. Combination is mentioned. (A11) and (A12) can be produced by a conventionally known alkylene oxide addition reaction. When two or more alkylene oxides are used, the addition form may be either block or random.

(A13) can be obtained by adding α-olefin oxide (a5) alone or in combination with (a5) and the above-mentioned alkylene oxide (b) to two active hydrogen atom-containing compounds. Examples of the compound containing two active hydrogen atoms include lower diols having 9 or less carbon atoms (ethylene glycol, propylene glycol, neopentyl glycol, etc.) and monoamines having 10 or less carbon atoms (methylamine, ethylamine, butylamine, 2-ethylhexyl) Liquid substances such as amines) can be suitably used. The method of adding (a5) alone or (a5) and (b) to these may be a known method, and the addition form when adding two or more kinds may be either block or random.

As the diol component in (A14),
Other diols may be used. Other diols include ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol having a number average molecular weight of less than 500, 1,4-
Butanediol, 1,3-butanediol, 3-methyl-1,5 pentanediol, 1,6-hexanediol, neopentyl glycol, 2-methyl-1,8 octanediol, 2,2,4-trimethyl-1 , 6 hexanediol, 3,3,5-trimethyl-1,6 hexanediol, 1,9-nonanediol, cyclohexyldimethanol, bis (hydroxyethoxy) benzene, a low molar adduct of bisphenols with EO or PO, Those having a number average molecular weight of less than 500 and combinations of two or more of them are mentioned.

When another diol is used, (a1)
(A2), (a3), (A11), (A12) and (A
13) The ratio of one or more diols selected from the group consisting of the other diols to the other diols is consequently 3 carbon atoms in (A).
It is necessary that the content of ４０40 aliphatic hydrocarbon groups be 5８０80% by weight.

The dicarboxylic acids (c) in (A14)
Examples thereof include the following (c1) and (c2) and a combination of two or more of them. (C1) an aliphatic dicarboxylic acid having 4 to 10 carbon atoms (adipic acid, succinic acid, sebacic acid, azelaic acid, fumaric acid, maleic acid, etc.) or an ester-forming derivative thereof (anhydride, lower alkyl ester, etc.) (c2) A) Aromatic dicarboxylic acids (phthalic acid, terephthalic acid, isophthalic acid, etc.) or ester-forming derivatives thereof Among these, preferred are aliphatic or aromatic dicarboxylic acids having 6 to 10 carbon atoms, especially adipic acid, sebacic acid , Azelaic acid, terephthalic acid, isophthalic acid and their ester-forming derivatives. (A14) can be produced by a conventionally known method. For example, a method in which an excess molar amount of a diol component and a dicarboxylic acid (c) are subjected to dehydration polycondensation or transesterification to obtain a polyester having a terminal hydroxyl group ( A14)
Is obtained.

The lactone monomer (d) used in (A15) includes ε-caprolactone, δ-valerolactone and the like. (A15) can be produced by a conventionally known method of adding a lactone monomer to a diol component.

The number average molecular weight of the high molecular weight polyol (A1) is from 500 to 10,000.

As the polyol component (A) in the main component (1), another polymer polyol (A2) can be used together with (A1) if necessary. (A2) includes, for example, the following (A21), (A22) and a combination of two or more selected from these groups. (A21) Polyether polyol: polyoxyethylene polyol, polyoxypropylene polyol, polyoxyethylene propylene polyol, EO and / or PO adduct of bisphenol, etc. (A22) Polyester polyol: polyethylene adipate diol, polybutylene adipate diol,
Polyethylene butylene adipate diol, polyneopentyl adipate diol, poly 3-methylpentylene adipate diol, polycaprolactone diol, polyvalerolactone diol, polyhexamethylene carbonate diol, etc.

The organic polyisocyanate (B) in the curing agent (2) includes, for example, the following (B1) to (B5) and a mixture of two or more thereof. (B1) 6 to 16 aromatic diisocyanates [2,4- and / or 2,6-tolylene diisocyanate (TDI), 4,4 ′ (B2) aliphatic diisocyanate having 6 to 10 carbon atoms [hexamethylene diisocyanate (HDI), lysine diisocyanate, etc.]; (B3) alicyclic diisocyanate having 6 to 16 carbon atoms [isophorone diisocyanate (IPDI), dicyclohexylmethane-4,4'-diisocyanate (hydrogenated MD
(B4) araliphatic diisocyanate having 8 to 12 carbon atoms [xylylene diisocyanate (XDI), α, α,
α ′, α′-tetramethylxylylene diisocyanate (TMXDI), etc.]; (B5) Modified organic diisocyanate selected from (B1) to (B4) (for example, modified isocyanurate, buret, carbodiimide, etc.) Among them, preferred are (B1), (B2) and (B3), particularly MDI, TDI, IPDI and hydrogenated MDI, from the viewpoint of coating film performance and durability.

The chain extender (C) optionally used in the main agent (1) includes, for example, the following (C1) to (C3)
And a combination of two or more of these. (C1) Low molecular weight diol having an average molecular weight of less than 500: compounds exemplified as other diols constituting (A14), alkylene oxide adducts of bisphenols, dimethylolpropionic acid, etc. (C2) Diamine compound: aliphatic Diamine (ethylenediamine, hexamethylenediamine, etc.), alicyclic diamine (isophoronediamine, 4,4′-dicyclohexylmethanediamine, norbornanediamine, etc.), aromatic diamine (4,4′-diaminodiphenylmethane, etc.), araliphatic Diamines (such as xylylenediamine), hydrazine or derivatives thereof, etc. (C3) Alkanoldiamine: hydroxylethylethylenediamine, N, N'-dihydroxyethylethylenediamine, etc.

The crosslinking agent (D) optionally used in the main agent (1) includes, for example, the following (D1). (D1) Polyhydric alcohol having an average molecular weight of less than 500: trihydric alcohols (glycerin, trimethylolpropane,
Hexanetriol, etc.), polyhydric alcohols with four or more functional groups (sorbitol, shucrose, etc.)

The equivalent ratio of the isocyanate group of (B) to the total of the active hydrogen groups of the active hydrogen components (A), (C) and (D) is usually 1: (0.70 to 1.0. 5), preferably 1: (0.80-1.3).

In order to accelerate the reaction, if necessary, catalysts used in ordinary urethane reactions [amine catalysts (triethylamine, N-ethylmorpholine, triethylenediamine, etc.), tin catalysts (dibutyltin dilaurate, dioctyltin dilaurate, octyl) Tin oxide, etc.), titanium-based catalysts (tetrabutyl titanate, etc.)]
May be used. As for the method of adding a catalyst to the two-pack coating composition, it is desirable to add the catalyst to the main agent (1).

The two-pack coating composition may optionally contain the following additives, if necessary. The additives include stabilizers, terminators, flame retardants, fillers, plasticizers, and pigments. Specific examples of these include the following. The method of adding an additive to the two-pack coating composition is not particularly limited, but is preferably added to the main component (1) in order to maintain the aging stability of the curing agent (2). Stabilizers: hindered phenol-based, hydrazine-based, benzophenone-based, benzotriazole-based, oxalic acid anilide-based or hindered amine-based stabilizers, and the like. Terminating agents: monoalcohols (eg, methanol, butanol), monoamines (eg, butylamine, dibutylamine), and alkanolamines (eg, monoethanolamine, diethanolamine). Flame retardants: Organic flame retardants such as halogen-based, phosphorus-based, and nitrogen-based flame retardants, and inorganic flame retardants such as inorganic salts. Filler: inorganic fillers such as talc, calcium carbonate, titanium oxide, silica and the like; and organic fillers such as resin powder and the like. Plasticizer: phthalic acid ester, aliphatic dibasic acid ester,
Glycol esters, fatty acid esters, phosphoric acid esters and the like can be mentioned. Pigment: inorganic pigments such as titanium oxide and carbon black, and organic pigments such as phthalocyanine blue.

As a method for producing the two-pack coating composition, there are a brush coating by mixing two liquids of a main agent (1) and a curing agent (2), or a spray coating using a two-pack air spray gun.

[0025]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the present invention is limited thereto. In the following, “part” indicates “part by weight” and “%” indicates “% by weight”. [Synthesis of Polymer Polyol (A1)] Synthesis Example 1 "Linearene 12" [molecular weight 168, 1-dodecene; Idemitsu Petrochemical Co., Ltd. in a four-necked flask equipped with a reflux condenser, a thermometer, a nitrogen inlet tube, and a stirrer. 254 parts, acetic acid 159
And 3 parts of sulfuric acid, and a 60% aqueous hydrogen peroxide solution was gradually added dropwise while maintaining the temperature at 85 ° C. Thereafter, 271 parts of toluene, 90 parts of sodium hydroxide, and 200 parts of water were added, and neutralization and hydrolysis were performed. Further, 11 parts of hydrochloric acid was added, and then liquid separation was performed using a separating funnel, and 520 parts of a supernatant toluene solution was added. I got This was transferred to another four-necked flask, toluene was removed, and then purified by distillation under reduced pressure.
220 parts of dodecanediol were obtained. In a separate four-necked flask, 200 parts of the above 1,2-dodecanediol and 140 parts of adipic acid were charged, and nitrogen gas was passed through under normal pressure to give 1 part.
Esterification was carried out at 90 to 210 ° C. while distilling off water. When the acid value of the produced polyester became 1 or less, the degree of pressure reduction was increased to complete the reaction. The obtained polyester [hereinafter referred to as polyester diol [1]] had a hydroxyl value of 55.2, an acid value of 0.3 and a molecular weight of 2020.

Synthesis Example 2 In a four-necked flask equipped with a reflux condenser, a thermometer, a nitrogen inlet tube, and a stirrer, 381 parts of "Linearene 18" (molecular weight: 252, 1-octadecene; manufactured by Idemitsu Petrochemical Co., Ltd.), acetic acid 1
59 parts and 3 parts of sulfuric acid were charged, and a 60% aqueous hydrogen peroxide solution was gradually added dropwise while maintaining the temperature at 85 ° C. afterwards,
Toluene 271 parts, sodium hydroxide 90 parts, water 200
The mixture was neutralized and hydrolyzed, and 11 parts of hydrochloric acid was further added. Then, liquid separation was performed using a separating funnel to obtain 520 parts of a supernatant toluene solution. This was transferred to another four-necked flask, toluene was removed, and then purified by distillation under reduced pressure.
340 parts of octadecanediol were obtained. In another four-necked flask, 200 parts of the above-mentioned 1,2-octadecanediol and 94 parts of adipic acid were charged, and esterification was carried out at 190 to 210 ° C. while passing nitrogen gas under normal pressure while distilling off water. When the acid value of the produced polyester became 1 or less, the degree of pressure reduction was increased to complete the reaction. The obtained polyester [hereinafter referred to as polyester diol [2]] had a hydroxyl value of 56.5, an acid value of 0.3 and a molecular weight of 1975.

Synthesis Example 3 In a separate four-necked flask, 286 parts of 1,2-octadecanediol obtained in Synthesis Example 2, 1714 parts of ε-caprolactone monomer and 0.02 part of tetrabutyl titanate were charged, and the mixture was placed under normal pressure. Through nitrogen gas, reaction temperature 160 ~
The reaction was performed at 180 ° C. for 6 hours. The obtained polylactone diol [hereinafter referred to as polylactone diol [3]] had a hydroxyl value of 56.0, an acid value of 0.1 and a molecular weight of 2002.

Synthesis Example 4 In an autoclave, 3 parts of potassium hydroxide was added to 286 parts of 1,2-octadecanediol obtained in Synthesis Example 2, and the mixture was dehydrated under reduced pressure at 130 ° C. to perform alcoholation.
At a reaction temperature of 110 ° C., 1714 parts of PO was injected to cause a reaction, and aging was performed at 130 ° C. After the neutralization and activated clay treatment, the polyether diol [hereinafter referred to as polyether diol [4]] obtained by dehydration at 130 ° C. had a hydroxyl value of 55.0 and a molecular weight of 2,040.

Synthesis Example 5 An autoclave was charged with 185 parts of dodecylamine.
At a temperature of 110 ° C., 88 parts of EO were injected and reacted to obtain 1
Aging was performed at 30 ° C. to obtain N-dodecyl-diethanolamine. In another flask, 200 parts of N-dodecyl-diethanolamine obtained and 87.5 parts of adipic acid were charged, and esterification was carried out at 190 to 210 ° C. while distilling water at 190 to 210 ° C. under a normal pressure through nitrogen gas. When the acid value of the produced polyester became 1 or less, the degree of pressure reduction was increased to complete the reaction. The obtained polyester [hereinafter referred to as polyester diol [5]] had a hydroxyl value of 55.5 and a molecular weight of 2020.

Synthesis Example 6 An autoclave was charged with 269 parts of octadecylamine, and 88 parts of EO was injected under pressure at a temperature of 110 ° C., and the mixture was aged at 130 ° C. to obtain N-octadecyl diethanolamine. To this, 1643 parts of ε-caprolactone monomer and 0.02 of tetrabutyl titanate were added.
The reaction temperature was 160
The reaction was carried out at ℃ 180 ° C. for 6 hours. The obtained polylactone diol [hereinafter referred to as polylactone diol [6]] had a hydroxyl value of 56.1, an acid value of 0.1 and a molecular weight of 1996.

Synthesis Example 7 An autoclave was charged with 269 parts of octadecylamine and 3 parts of triethylamine.
1731 parts were press-fitted and reacted, and aged at 130 ° C. After neutralization and activated clay treatment, the polyether [hereinafter referred to as polyether diol [7]] obtained by dehydration had a hydroxyl value of 56.0 and a molecular weight of 2004.

[Production of chlorinated product of comparative modified polyolefin] Synthesis Example 8 Polypropylene 300 having an average molecular weight of 4000 obtained by pyrolyzing polypropylene (average molecular weight 125,000)
And 15 parts of maleic anhydride were charged into a device equipped with a reflux tube, heated to 180 ° C. while introducing a small amount of nitrogen, uniformly dissolved, and then a solution of 3 parts of dicumyl peroxide dissolved in 15 parts of xylene was added. After adding for 30 minutes and continuing the reaction for 1 hour, xylene and unreacted maleic anhydride were distilled off over 1 hour at 180 ° C. under a reduced pressure of 3 mmHg. The amount of maleic anhydride added to the obtained acid-modified polypropylene was 0.8%. Next, 200 parts of this acid-modified polypropylene was dissolved in 800 parts of carbon tetrachloride to perform chlorination, and then a toluene solution was obtained by solvent replacement. The solid content was 30%, the viscosity was 150 cps (25 ° C.), and the yellow color had a bound chlorine amount of 24%. A liquid chlorinated solution was obtained.

Synthesis Example 9 A propylene-ethylene block copolymer 3 having an average molecular weight of 8000 and an ethylene content of 5 mol% obtained by thermally decomposing a polyolefin-based polymer (average molecular weight 165,000).
Acid modification and chlorination were carried out in the same manner as in Production Example 8 except that 00 parts and 15 parts of maleic anhydride were used. Thereafter, a toluene solution was obtained by solvent replacement, and a maleic anhydride addition amount of 3.4% and a bound chlorine amount were obtained. A yellow liquid chlorinated solution having a concentration of 24.5%, a solid content of 30% and a viscosity of 85 cps (25 ° C.) was obtained.

[Production of urethane resin (C)] Synthesis Example 10 In a four-necked flask, a hydroxyl value of 74.0 mgKOH / g 1000 parts of polybutanediene polyol, 129 parts of 1,4-butanediol, and 9.6 parts of trimethylolpropane , I
Charge 466 parts of PDI and 2407 parts of toluene,
After reacting at 10 ° C. for 4 hours, 1 part of dibutyltin dilaurate was charged, and further reacted at 110 ° C. for 6 hours, and a urethane resin solution (C-1) having a solid content of 40% and a solution viscosity (25 ° C.) of 12,000 cps (C-1) I got

Synthesis Example 11 A hydroxyl value of 111.2 mg KOH was prepared in the same manner as in Synthesis Example 10.
/ G of polycaprolactone diol 504.5 parts, dimethylolpropionic acid 26.8 parts, IPDI 144.3
Part, toluene 675.4 parts and cyclohexanone 33
8 parts to 40% solid content, solution viscosity (25 ° C) 8000c
A ps urethane resin solution (C-2) was obtained.

Example 1 Polyester diol [1] 84.4 as main agent (1)
Parts, 1.3 parts of 1.4-butanediol and a curing agent (2)
The two-component coating composition was spray-coated on a polypropylene plate lightly washed with water so as to have a dry film thickness of 15 μm, using 14.3 parts of MDI as a sample.
After drying at 20 ° C. for 20 minutes, a two-component urethane paint [trade name: Samprene TCM-312 (base agent) /
Samprene CA-075N (hardener), manufactured by Sanyo Chemical Industry Co., Ltd.] was spray-coated so as to have a dry film thickness of 25 μm, and dried at 80 ° C. for 30 minutes to obtain a coated plate (1).

Example 2 Polyester diol [2] 77.4 as main agent (1)
A coated plate (2) was obtained in the same manner as in Example 1, except that 2.6 parts of ethylene glycol and 2.6 parts of MDI were used as the curing agent (2).

Example 3 Polylactone diol [3] as the main ingredient (1) 77.7
A coated plate (3) was obtained in the same manner as in Example 1, except that 2.7 parts of ethylene glycol and 19.6 parts of IPDI were used as the curing agent (2).

Comparative Example 1 100 parts of the chlorinated solution obtained in Synthesis Example 9, Synthesis Example 10
Was mixed with 75 parts of (C-1) obtained in (1) and 25 parts of toluene to obtain a yellow liquid coating composition. This was sprayed with one liquid in the same manner as in Example 1 to obtain a coated plate (4).

Comparative Example 2 100 parts of the chlorinated solution obtained in Synthesis Example 9, Synthesis Example 11
Was mixed with 75 parts of (C-2) and 25 parts of toluene to obtain a yellow liquid coating composition. This was subjected to one-liquid spray coating in the same manner as in Example 1 to obtain a coated plate (5).

COMPARATIVE EXAMPLE 3 Polybutylene adipate diol having a number average molecular weight of 2,000
87.3 parts of MDI, 12.2 parts of MDI, and 0.5 part of 1.4-butanediol were blended to obtain a coating composition. This was subjected to one-liquid spray coating in the same manner as in Example 1 to obtain a coated plate (6).

After the coated plates of Examples 1 to 3 and Comparative Examples 1 to 3 were allowed to stand at room temperature for one day, tests for adhesion, water resistance and solvent resistance were performed. Table 1 shows the results.

[0043]

[Table 1]

Test Method Adhesion: A coated cellophane tape peeling test was performed on the coated surface of the coated plate in accordance with JIS-K5400. Water resistance: After the coated plate was impregnated with warm water of 40 ° C. for 240 hours, the water was wiped off, and one hour later, a stripped cellophane tape peeling test was performed. Solvent resistance: The coated plate was impregnated with gasoline / ethanol = 9/1 (weight ratio) at 25 ° C. for 30 minutes, and the floating state of the coating film was observed.

[0045]

According to the present invention, when used as a coating composition for coating a polyolefin resin molded article, the two-pack coating composition of the present invention does not use a solvent that causes air pollution, and is free from endocrine. Also, it does not include halogen that causes dioxin generation. In addition, it exhibits extremely excellent performance in adhesion, water resistance, solvent resistance, and the like, and does not cause problems such as thermal deformation of a molded product. Because of the above-mentioned effects, the two-pack type coating composition of the present invention is extremely useful for industrial applications such as a coating primer for a polyolefin-based resin substrate and an exterior coating.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4J038 DG051 DG081 DG121 DG131 DG141 DG161 DG271 DG281 NA04 NA12 NA27 PB08

Claims (3)

[Claims] 1. A main component (1) comprising the following polyol component (A) and, if necessary, a chain extender (C) and a crosslinking agent (D).
And a curing agent (2) comprising an organic polyisocyanate (B). Polyol component (A): contains at least one kind of high molecular polyol (A1) containing an aliphatic hydrocarbon side chain having 3 to 40 carbon atoms and having a number average molecular weight of 500 to 10,000, and the carbon in (A) Number 3
5 to 80% by weight of aliphatic hydrocarbon side chain content of 40 to 40% by weight
A polyol component. 2. (A1) is the following (A11) to (A1)
The two-pack coating composition according to claim 1, which is one or more polymer polyols selected from 5). (A11) A 1,2-alkanediol having 5 to 42 carbon atoms (a1), a glycerin monoalkyl ether having 6 to 43 carbon atoms (a2) or a glycerin fatty acid monoester having 7 to 44 carbon atoms (a3), A polyether diol obtained by adding 2 to 4 alkylene oxides (b). (A12) Alkylene oxide having 2 to 4 carbon atoms (b) is 2 to 10 alkylamine (a4) having 3 to 40 carbon atoms.
(A13) A polyether diol obtained by polymerizing an alkylene oxide comprising an α-olefin oxide (a5) having 5 to 42 carbon atoms. (A14) (a1), (a2), (a3), (A1
1) A polyester diol obtained by polycondensation of a diol component comprising at least one diol selected from the group consisting of (A12) and (A13) with a dicarboxylic acid (c). (A15) (a1), (a2), (a3), (A1
1) A polylactone diol obtained by adding a lactone monomer (d) to a diol component comprising at least one diol selected from the group consisting of (A12) and (A13). 3. The two-pack type coating composition according to claim 1, which is used for coating a polyolefin resin molded article.