JP2000239602A - Glare-preventive coating composition for polyolefin molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glare-preventive coating composition for polyolefin molded articles, which is a one-pack glare-preventive coating, combines adhesive properties and flexibility to molded articles, is excellent in glare-preventive effects, and has excellent film properties such as oil staining preventive properties, low-temperature flexing properties, resistance to scratching and resistance to color elimination and abrasion. SOLUTION: The composition is prepared by mixing at least three graft- polymerized resins having different glass transition points, wherein at least two resins of the at least three graft-polymerized resins are resins A and B formed by graft-polymerizing an acrylic resin component and a chlorinated polyolefin resin component, and at least one resins of the at least three graft- polymerized resins is a resin C formed by graft-polymerizing an acrylic resin component and a polyurethane resin component.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antiglare coating composition for a polyolefin-based molded article for applying to interior parts such as instrument panels for automobiles.

[0002]

2. Description of the Related Art As shown in FIG. 2, an instrument panel integrated with an airbag of an automobile has a panel body 91 (FIG. 2).
(A)) and an airbag door 92 (FIG. 2 (b)), both of which are separate members. As shown in FIG. 2A, an opening 911 of the panel body 91 is provided with an airbag door 92.
Are fitted.

[0003] The panel body 91 is required to have high strength, so that a polypropylene resin (hereinafter referred to as PP) as a hard material is used. On the other hand, the airbag door 92
In order to expand airbags, a flexible material such as a polyolefin-based thermoplastic elastomer (hereinafter referred to as TPO) is used. And
As shown in FIG. 2C, the panel main body 91 and the airbag door 92 are often formed with coating films 910 and 920, respectively.

[0004]

[Problem to be Solved] However, the panel body 91
And the airbag door 92 separately.
When 0 is formed, two or more painting processes are required, and the manufacturing cost is increased. Also, the panel body 9 made of a different material is used.
1 and the airbag door 92, a coating 91 of a different material
In the case of coating with 0,920, differences in the texture, depth of color, and color shift due to visual observation occur due to the difference in paint.

[0005] Further, since the material of the airbag door 92 expands and contracts due to the material deformation and the aging of the material during deployment, the coating film is required to have flexibility to follow the deformation of the airbag door. In addition, since the coating film itself has low-temperature flexibility and flexibility after thermal degradation, the flexibility of the coating film is required to maintain adhesion to the airbag door and the panel body.

For this reason, the coating films 910 and 920 covering the panel body 91 and the airbag door 92 are not provided with the panel body 91.
In addition to the adhesiveness to the airbag door 92, its own flexibility is required. On the other hand, when a two-component urethane paint is used, adhesion and flexibility to an airbag door made of TPO can be obtained, but adhesion to a panel body made of PP is difficult. Therefore, it is necessary to use a primer to improve the adhesion to PP,
The cost will be high. Therefore, the two-component urethane paint is disadvantageous in terms of workability and cost.

Therefore, it is required to use a one-component one-coat paint which is advantageous in terms of workability and cost. For PP, a one-component one-coat paint has already been used, but this paint has a problem in the glass transition point and cannot provide flexibility. For example, when the airbag is deployed, the paint film is scattered and T
The coating film cannot follow the time-dependent deformation of PO, causing cracks and the like. On the other hand, when a one-component one-coat paint using only a resin having a low glass transition point as a base material, which requires only flexibility, is used.
Defects occur in the coating properties, such as adhesion to oil and oil and fat resistance and chemical resistance.

Further, it is necessary for the antiglare paint for an instrument panel to reduce the gloss value to 1.0 or less in order to achieve an antiglare effect. As such an antiglare paint, there is a one-pack antiglare paint obtained by adding hard polyurethane beads to PP. However, when the resin component is changed to a flexible resin or the like from the viewpoint of flexibility, aggregation and coagulation of beads occur, and defects occur in gloss and smoothness of the coating film.

As the anti-glare paint, silica, diatomaceous earth,
Common inorganic or organic matting pigments such as alumina, calcium carbonate, magnesium carbonate, and fine acrylic resin powder are used. Of these, silica is widely used in one-pack one-coat paints for PP. However, coatings containing silica easily leave white traces when rubbed with nails.
In addition, there are disadvantages such as that the surface of the coating film becomes white and blurred, and uneven gloss tends to occur. In addition, the coating film deteriorates due to oil and fat contamination when touched by a human hand, and has disadvantages such as frictional discoloration and volatile oil property.

In view of the above problems, the present invention is a one-pack type anti-glare paint, which has both adhesion and flexibility to a molded article, has an excellent anti-glare effect, and has an oil and fat contamination preventing property. An object of the present invention is to provide an antiglare coating composition for a polyolefin-based molded article having excellent coating film properties such as low-temperature flexibility, scratch resistance, and colorfastness.

[0011]

According to the present invention, as set forth in claim 1,
A mixture of at least three types of graft polymerization resins having different glass transition points, and at least two of the at least three types of graft polymerization resins are resins obtained by graft polymerization of an acrylic resin component and a chlorinated polyolefin resin component. A and B, and at least 3
At least one of the graft polymerization resins is a resin C obtained by graft polymerization of an acrylic resin component and a polyurethane resin component, and is an antiglare coating composition for a polyolefin-based molded article.

The operation of the present invention will be described. Since the coating composition of the present invention contains the resin A and the resin B having the above-described compositions, a tough coating film having both hard and soft properties can be formed, and the adhesion to an olefin-based molded article can be improved. ， Excellent flexibility. In addition, it can exhibit excellent coating film properties such as hardness, prevention of oil and fat contamination, low temperature flexibility, scratch resistance, and resistance to discoloration and abrasion. Further, the coating composition of the present invention
Since the resin C contains a hard polyurethane resin powder which functions as an antiglare agent, an antiglare paint having higher performance than before can be obtained. Also, the composition of the present invention
Since a one-pack type paint having the above excellent properties can be prepared, the number of coating steps can be reduced, the manufacturing cost can be reduced, and the workability is excellent.

Further, at least two different glass transition points are used.
An antiglare coating composition is prepared by mixing at least one type of chlorinated polyolefin grafted acrylic resin and at least one type of acrylic grafted polyurethane resin.
Therefore, a coating film having excellent flexibility can be formed. Also, 2
Kinds of chlorinated polyolefin grafted acrylic resin A,
Since B has the above-mentioned chlorine content, it has excellent adhesion to polyolefin-based molded articles and excellent coating film properties.

The details of the present invention will be described. Claim 2
As described above, one of the at least two resins A and B has a chlorine content in the olefin portion of 20 to 30% and a resin A content of the chlorinated polyolefin resin component of 8 to 12%.
%, A molecular weight of 70,000 to 90,000, a chlorinated polyolefin-grafted acrylic resin having a glass transition point of 70 to 90 ° C. after modification of the chlorinated polyolefin, and the other resin B has a chlorine content of the olefin portion of 20 to 30%. The chlorinated polyolefin resin component content of the resin B is 20 to 30% and the molecular weight is 3
A chlorinated polyolefin-grafted acrylic resin having a glass transition point of from 60,000 to 40,000 after modification of the chlorinated polyolefin, and
Has an acrylic resin component of 5 to 30% and a molecular weight of 20,000 to 4
It is preferably an acrylic graft polyurethane resin having a glass transition point of -60 to -20C.

In the above resin A, when the chlorine content of the olefin portion is less than 20%, the storage stability of the paint may be significantly deteriorated. On the other hand, if it exceeds 30%, the adhesion to the PP material or TPO material may be reduced. When the content of the chlorinated polyolefin resin component in the resin A is less than 8%, the storage stability of the paint may be deteriorated. On the other hand, if it exceeds 12%, the adhesion to the PP material or TPO material may be reduced.

When the molecular weight of the resin A is less than 70,000, there is a possibility that the antifouling property and solvent resistance may be reduced, and if it exceeds 90,000, the flexibility of the coating film may be reduced. There is a risk. If the glass transition point of the resin A is less than 70 ° C., the coating may have a reduced scratch resistance, and if it has a glass transition temperature of more than 90 ° C., the impact resistance of the coating may be extremely reduced. is there.

In the resin B, if the chlorine content of the olefin portion is less than 20%, the stability of the paint may be reduced. If the chlorine content exceeds 30%, adhesion to the PP and TPO materials may occur. There is a possibility that the properties and the oil and fat contamination prevention properties may be reduced. In the resin B, if the content of the chlorinated polyolefin resin component is less than 20%, the stability of the paint may be reduced.
There is a possibility that the adhesion to the material and the TPO material and the oil / fat contamination prevention property may be reduced.

When the molecular weight of the resin B is less than 30,000, there is a possibility that the oil / fat contamination preventing property is reduced, and when it exceeds 40,000, the impact resistance of the coating film is reduced. If the glass transition point of the resin B is lower than 60 ° C., the scratch resistance of the coating film may decrease, and if it exceeds 80 ° C., the flexibility of the coating film may decrease.

In the resin C, when the acrylic resin component is less than 5%, the stability of the coating material is reduced. When the acrylic resin component is more than 30%, the oil and fat stain resistance may be reduced. If the molecular weight of the resin C is less than 20,000, the low-temperature flexibility may decrease. If it exceeds 40,000, the stability of the paint may decrease. When the glass transition point of the resin C is lower than -60 ° C, there is a possibility that the oil and fat stain resistance is reduced, and when the glass transition point is higher than -20 ° C, the low-temperature flexibility is lowered.

The acrylic resin component of the resins A, B and C is preferably at least 10%. Thereby, the compatibility between the resins A, B, and C having different glass transition points is improved, and the occurrence of the resin separation phenomenon can be prevented. In particular,
When mixing polyurethane beads as described below,
Aggregation of the polyurethane beads and a coagulation phenomenon associated therewith are induced, and the stability of the paint may be deteriorated. Therefore, in order to prevent such a phenomenon, it is preferable that the acrylic resin component of the resins A, B, and C is 10% or more as described above.

According to a third aspect of the present invention, the mixing ratio of the resin A, the resin B, and the resin C is 45-75: 9-2.
The ratio is preferably 5: 5 to 30. When the mixing ratio of the resin A to the resins B and 25 is less than 45, or when the mixing ratio of the resin A to the resins C and 30 is less than 45, the coating film has scratch resistance and adheres to the PP material and the TPO material. May be reduced. On the other hand, when the mixing ratio of the resin A to the resins B and 9 exceeds 75,
When the mixing ratio of resin A to 5 exceeds 75,
There is a possibility that the ability to prevent oil and fat contamination is significantly reduced. If the mixing ratio of the resin B to the resins A and 75 is less than 9, or if the mixing ratio of the resin B to the resins C and 30, is less than 9, there is a possibility that the oil / fat contamination prevention property is significantly reduced. On the other hand, when the mixing ratio of resin B to resins A and 45 is 2
If the ratio exceeds 5, or if the mixing ratio of the resin B to the resins C and 5 exceeds 25, there is a possibility that the scratch resistance of the coating film and the adhesion to the PP material and the TPO material are reduced. If the mixing ratio of the resin C to the resins A and 75 is less than 5, or if the mixing ratio of the resin C to the resins B and 25 is less than 5, the low-temperature flexibility may decrease. On the other hand, when the mixing ratio of the resin C to the resins A and 45 exceeds 30, or when the mixing ratio of the resin C to the resins B and 9 is 3
If it exceeds 0, the oil and fat contamination resistance may decrease.

The content of the resin C is preferably 10 to 30% based on the total amount of the resin A and the resin B.
If it is less than 10%, the low-temperature flexibility may decrease, and if it exceeds 30%, the oil and fat contamination may decrease.

According to a fourth aspect of the present invention, the anti-glare paint is
It is preferable to mix hard polyurethane beads synthesized in a stage prior to beading a polyester urethane resin having a urethane bond.

Hard polyurethane beads have high hardness. Therefore, a larger amount can be added to the antiglare paint. Therefore, the gloss value can be reduced and the antiglare effect can be exhibited without lowering the hardness of the coating film. Further, a matting effect can be exhibited with a coating film thickness of about 20 μm. Further, even when a different material is coated, the boundary between the two members can be hidden, and the difference in texture can be eliminated, so that the hiding effect is excellent. Further, the hard polyurethane beads have high hardness and are hardly swelled by fats and oils, so that it is possible to improve the oil and fat contamination prevention properties of the coating film.

It is preferable that the hard polyurethane beads are stably dispersed in the coating composition. Thereby, the excellent effect of the addition of the hard polyurethane beads can be more effectively exerted. Here, "stable dispersion" refers to a state in which the hard polyurethane beads are dispersed without agglomerating each other. In order to obtain such a state, the dispersibility is improved by an oil-modified alkyd resin. Need to do.

The hard polyurethane powder has an average particle size of 8 to 12 μm and a glass transition point (Tg) of 60 to 90.
C. is preferred. Since such a hard polyurethane powder has a high hardness, the gloss value can be lowered without lowering the hardness of the coating film by adding the hard polyurethane powder to the coating composition. Further, since it is difficult to swell with oils and fats, it is possible to prevent resin contamination of the coating film. When the average particle size is less than 8 μm or more than 12 μm, or when the glass transition point is
When it is lower than 90 ° C. or higher than 90 ° C., there is a possibility that the effect of preventing the reduction of the gloss value and the contamination of the coating film may be lowered.

In adjusting the glass transition point, it is preferable to use, for example, a monomer having a high glass transition point as an acrylic resin component. This gives
By imparting hardness to the coating film, it is possible to obtain an excellent effect of preventing oil and fat contamination. As the monomer having a high glass transition point, for example, methyl methacrylate, acrylic acid, styrene and the like can be used.

The antiglare paint composition of the present invention can be used, for example, as an instrument panel member with an airbag door of a car, a speaker box or an audio rack of a household electric appliance, a furniture desk, a chair, a design member of a sideboard, or an inner wall. It can be used for a member having an inner flexibility of a material.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 An antiglare paint for a polyolefin molded article according to an embodiment of the present invention will be described with reference to FIG. The anti-glare coating composition for a polyolefin-based molded article of this example is a mixture of three types of graft polymerization resins having different glass transition points. 3
At least two of the graft polymer resins are resins A and B obtained by graft polymerization of an acrylic resin component and a chlorinated polyolefin resin component, and at least one of the at least three graft polymer resins is
Resin C obtained by graft polymerization of an acrylic resin component and a polyurethane resin component.

The resin A has an olefin moiety having a chlorine content of 20.
Chlorinated polyolefin graft acrylic resin having a chlorinated polyolefin resin component content of 8% to 12%, a molecular weight of 70,000 to 90,000, and a glass transition point after modification of the chlorinated polyolefin of 70 to 90 ° C. It is. Resin B
Has a chlorine content of 20 to 30% in the olefin portion, a chlorinated polyolefin resin component content of the resin B of 20 to 30%, a molecular weight of 30,000 to 40,000, and a glass transition point after modification of the chlorinated polyolefin of 60 to 80 ° C. Is a chlorinated polyolefin-grafted acrylic resin. The resin C is an acrylic graft polyurethane resin having an acrylic resin component of 5 to 30%, a molecular weight of 20,000 to 40,000, and a glass transition point of -60 to -20C.

The antiglare paint contains a hard polyurethane powder obtained by synthesizing a polyester urethane resin having a urethane bond at a stage prior to powderization. This powder
The average particle size is 8 to 12 µm, and the glass transition point (Tg) is 60 to 90 ° C.

Next, a method for producing the antiglare paint of this embodiment will be described. Preparation of chlorinated polyolefin-grafted acrylic resin A In a four-necked flask equipped with a cooler, a thermometer, a dropping funnel and a stirrer, 60 parts of toluene and a chlorinated polyolefin having a chlorine content of 27% (manufactured by Toyo Kasei Kogyo Co., Ltd .; 40 parts of a 25% toluene solution of hardlen 14LLB) was charged,
The temperature inside the flask was raised to 95 ° C. Then, 55 parts of methyl methacrylate, 16 parts of i-butyl methacrylate,
A mixed solution of 10 parts of styrene, 8 parts of β-hydroxypropyl methacrylate, 1 part of methacrylic acid, 1 part of benzoyl peroxide, and 1.2 parts of azobisisobutyronitrile was added dropwise over 3 hours. After 1 hour and 2 hours, 0.3 parts of azobisisobutyronitrile was added,
Two hours later, 10 parts of toluene were added and the mixture was cooled. The residue was heated 50%, the weight average molecular weight was 80,000 by GPC (gel permeation chromatography), and the chlorinated polyolefin graft was 75 ° C in glass transition temperature by TMA (thermomechanical analysis). Acrylic resin A was obtained.

Preparation of chlorinated polyolefin-grafted acrylic resin B In a four-necked flask equipped with a cooler, a thermometer, a dropping funnel and a stirrer, 15 parts of toluene and a chlorinated polyolefin having a chlorine content of 27% (Toyo Kasei Kogyo Co., Ltd.) ); 100 parts of a 25% toluene solution of Hard Len (14LLB) was charged, and the temperature inside the flask was raised to 95 ° C. Then, 49 parts of methyl methacrylate, 15 parts of i-butyl methacrylate
Of styrene, 5 parts of β-hydroxypropyl methacrylate, 1 part of methacrylic acid, 1 part of benzoyl peroxide, and 2.2 parts of azobisisobutyronitrile were added dropwise over 3 hours. After 1 hour and 2 hours, 0.3 parts each of azobisisobutyronitrile was added, and 2 hours later, 10 parts of toluene was added and cooled, the heating residue was 50%, and the weight average molecular weight by GPC was 35,000. ,
A chlorinated polyolefin-grafted acrylic resin B having a glass transition temperature of 60 ° C. by TMA was obtained.

Preparation of Acrylic-Modified Polyurethane Resin C Three types of acrylic-modified polyurethane resins C-1 and C-
2, C-3 was prepared. i) Acrylic-modified polyurethane resin C-1 First, 100 parts of isophorone diisocyanate was charged into a four-necked flask equipped with a stirrer, a reflux condenser, a dropping funnel and a thermometer, heated to 90 ° C, and melted with stirring. Poly (3-methyl-1,5-pentylene) adipate (Kuraray polyol P2010, hydroxyl value 56.1K)
449.8 parts of OH mg / g, manufactured by Kuraray Co., Ltd., 1.46 parts of 2-hydroxyethyl methacrylate, and 0.03 part of methylhydroquinone were dropped in about 1 hour. 9 internal temperature
After reacting at 0 ° C for 4 hours, methyl ethyl ketone 2
75 parts and 275 parts of toluene were added and diluted by stirring at 60 ° C. for 1 hour. Then, with stirring, isophorone diamine 30.6
Part, a solution of 167 parts of isopropanol was dipped in about 1 hour. Further, 4.81 parts of monoethanolamine was added to block the end. Subsequently, methyl methacrylate 125.
7 parts, 125.7 parts of butyl methacrylate, 154 parts of methyl ethyl ketone, and 154 parts of toluene were charged and heated to 70 ° C. under a nitrogen stream and AIBN (formal substance name 2,2′-).
Azobisisobutyronitrile)
It was added at time intervals and reacted for another 10 hours. The obtained acrylic-modified urethane resin C-1 has a resin solid content of 45%,
The viscosity is 3500 mPa · s, the weight average molecular weight is 24000, and the acrylic resin component is 30% in the resin solid content.
And the glass transition point was -55 ° C.

Ii) Acrylic-modified urethane resin C-2 First, 100 parts of isophorone diisocyanate and 1.15 parts of 21-methacryloyloxyethyl isocyanate were placed in a four-necked flask equipped with a stirrer, a reflux condenser, a dropping funnel, and a thermometer. , Methylhydroquinone (0.03 part), heated to 90 ° C., and melted while stirring (polylite OD-X-668, manufactured by Dainippon Ink and Chemicals, Ltd., hydroxyl value 56.1 KOHmg)
/ G) 449.8 parts were added dropwise in about 1 hour. 90 internal temperature
After reacting at 4 ° C for 4 hours, methyl ethyl ketone 27
5 parts and 275 parts of toluene were added, and the mixture was stirred and diluted at 60 ° C. for 1 hour. Then, with stirring, isophorone diamine 30.6
And 168 parts of isopropanol were added dropwise in about 1 hour. Further, 6.18 parts of monoethanolamine was added to block the end. Subsequently, methyl methacrylate 125.
9 parts, styrene 125.9 parts, methyl ethyl ketone 15
4 parts and 154 parts of toluene were charged and heated to 70 ° C. in a nitrogen stream, and 7.6 parts of AIBN were added in three portions at one-hour intervals, and the reaction was further performed for 10 hours. The resulting acrylic-modified urethane resin C-2 had a resin solids content of 45% and a viscosity of 5500
mPa · s, weight average molecular weight of 30,000,
The acrylic resin component was 40% of the resin solid content, and the glass transition point was -38 ° C.

Iii) Acrylic-modified urethane resin C-3 First, a polycaprolactone diol (Placcel PLC220, hydroxyl value: 56.1 KOHm) was placed in a four-necked flask equipped with a stirrer, reflux condenser, dropping funnel and thermometer.
g / g, manufactured by Daicel Chemical Industries, Ltd.) 574.7 parts, 2
-Hydroxyethyl methacrylate 1.46 parts, 1,4
-21.3 parts of butanediol, 0.03 parts of methylhydroquinone, 0.14 parts of dibutyltin dilaurate, 299 parts of methyl ethyl ketone, and 299 parts of toluene are heated and heated to 70 ° C., and while stirring, 100 parts of tolylene diisocyanate and methyl ethyl ketone are added. A mixed solution of 50 parts and 50 parts of toluene was dropped in about 1 hour. 70 ° C internal temperature
And reacted for 4 hours. Then styrene 232.5
Parts, 232.5 parts of methyl methacrylate, 233 parts of methyl ethyl ketone, and 233 parts of toluene.
After heating to 70 ° C., 27.5 parts of AIBN were added in three portions at 1-hour intervals, and the reaction was continued for another 10 hours. The obtained acrylic-modified urethane resin C-3 had a resin solid content of 50%, a viscosity of 2500 mPa · s, and a weight average molecular weight of 26,000. The acrylic resin component was 40% of the resin solid content, and the glass transition point was − It was 49 ° C.

Production of Hard Polyurethane Beads Next, a method for producing the above-mentioned hard polyurethane powder will be described. First, in order to harden urethane, the molecular weight of the polyester urethane resin, which is the material, is increased. Therefore, malonic acid, succinic acid. At least one aliphatic dibasic acid such as glutaric acid, adipic acid, pimelic acid, corcolic acid, azelaic acid, sebacic acid and an aliphatic dihydric alcohol such as ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, hexanediol, etc. And a polyester polyol having a molecular weight of about 500 to 3,000.

Next, the polyester polyol is further treated with at least one of the above-mentioned aliphatic dihydric alcohols and at least one of diisocyanate compounds such as xylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate and tolylene diisocyanate. The chain is extended. Thereby, the molecular weight is 4000 to 40.
About 000 polyester urethane resins can be obtained.

Then, using a three-necked flask having a stirrer, a reflux condenser and a dropping funnel, 130.5 g of the polyester urethane resin and an oil-modified alkyd resin (dispersed coconut oil-modified, Length 40%) (Phthal Kid 133-60; manufactured by Hitachi Chemical Co., Ltd.) 10.5
g at about 85 ° C. with 743.0 g of xylene as a dispersion medium.
Heat to This disperses the polyester urethane resin and dissolves the oil-modified alkyd resin.

Next, Colonnade H is used as an isocyanate.
L (hexamethylene diisocyanate: manufactured by Nippon Polyurethane Industry Co., Ltd.) 68.5 g, zinc naphthenate 3.5 g (metal content 6%) as a reaction catalyst, and 1% xylene solution of dibutyltin dilaurate as a curing accelerator 1
Add 2.0 g and react at 85 ° C. for 2 hours.

Thereafter, 35.0 g of propylene glycol monomethyl ether was added as a reaction terminator, and the mixture was maintained at 85 ° C. for 1 hour to remove unreacted isocyanate.
450 g of a suspension of hard polyurethane beads having a particle size of 8 to 12 μm were obtained. By filtering the suspension, hard polyurethane beads were obtained.

The rigid polyurethane powder has a significantly higher crosslinking density and a hydroxyl value of about 2 than conventional products such as polyurethane powder disclosed in Japanese Patent Publication No. 50-8116.
It became 10-220.

Resin A 68%, Resin B 17%, Resin C1
After mixing 5%, 45 parts by weight of a hard polyurethane powder were added to 100 parts by weight of the total amount of the resins A, B and C. There are three types of resins C, C-1, C-2, and C-3, which were used as modifiers for low-temperature flexibility. Thus, the antiglare coating composition of this example was obtained.

The antiglare paint of this example was applied to an instrument panel with an airbag of an automobile. The instrument panel includes a panel main body 1 and an airbag door 2 as shown in FIG. 1A, and both are separate members (see FIG. 2). The panel body 1 is provided with an opening 11 for fitting the airbag door 2, and the airbag door 2 is fitted in the opening 11, and the entire surface is coated with the anti-glare paint of this example. It was set to 3. The panel body 1 is made of PP,
The airbag door 2 is made of TPO.

As shown in FIG. 1B, when the airbag 5 is inflated, the airbag door 2 moves to the panel body 1.
The coating 3 covering the surface of the panel 3 was also cut off from the coating 3 covering the panel body 1 and followed the deformation while being attached to the airbag door 2. At this time, there was no peeling or scattering of the coating film. Further, the coating film 3 was dull, and the effect of eliminating the difference in texture between the panel body 1 and the airbag door 2 and hiding the boundary was recognized.

Next, the physical properties of each coating film of the antiglare paint are measured. First, the anti-glare paint is made of the same polypropylene and TPO as the panel body 1 and the airbag door 2.
A test piece consisting of a molded product has a coating thickness of about 15 to 20 μm.
And dried at room temperature for 48 hours.
On the other hand, the coating was similarly applied to a thickness of 15 to 20 μm, and then dried in a 60 ° C. atmosphere for 10 minutes. The drying conditions at the time of forming the coating film were substantially the same as the drying conditions at the time of using the conventional antiglare paint.

Next, a method of measuring physical properties of the coating film will be described. First, the oil and fat contamination test will be described. Tallow (reagent: manufactured by Kanto Chemical Co., Ltd.) 2 g / 10 on the surface of the coating film to be tested
0 cm ² was applied, and the test piece was left in an electric furnace without forced convection at 80 ° C. for one week. At this time, a flannel (a type of cloth) was placed on the test piece in order to maintain a constant amount of tallow volatilization. After the completion of the standing, the test piece was sufficiently washed with a small amount of a neutral detergent, and then a coating film peeling test using an adhesive tape (cellophane tape) and a color loss test using a friction tester were performed.

The coating film peeling test was carried out by sticking a cellophane tape on the entire test surface of the test piece and then peeling off the cellophane tape. On the other hand, in the discoloration test, a gauze of five layers was used as a friction element, and the friction element was applied on the surface of the test piece with a load of 40.09 kPa and a stroke of 100.
mm, reciprocated 200 times. After that, the surface of the above-mentioned friction element and the test piece were visually observed.
It was determined to be grade 5 to grade 5.

The criteria for the above-mentioned discoloration grade are as follows. "Falling value 5th grade" ... no discoloration. "Color domain 4th grade": Discoloration is slightly observed, but there is almost no change in the color tone and gloss of the coating film surface. "Discoloration grade 3": Discoloration is recognized. "Discoloration grade 2": noticeable discoloration is observed. "Color discoloration class 1": The base of the test piece is exposed.

Further, the above-mentioned coating film peeling test and color fading test were performed on a dry cloth friction fastness test for a test piece immediately after drying of the coating film. Further, a 60 ° gloss gloss value of the test piece immediately after drying of the coating film was measured based on JISZ8741 standard.

The test results will be described. Each of the test pieces had a 60 ° gloss gloss value of 0.8. In the paint peeling test in the oil and fat contamination test, no peeling of the paint film was observed in both test pieces. Further, the discoloration test in the oil and fat contamination test was grade 4 or higher. Further, in the above-mentioned dry cloth rub fastness test, no peeling of the coating film was observed, and the discoloration was grade 4 or higher. Further, the surface of the test piece was not so scratched that the gloss of the coating film surface changed. From the above, it was found that the coating films of both test pieces were resistant to oil and fat contamination, hardly damaged, and had anti-glare properties required for automotive instrument panels.

[0052]

According to the present invention, there is provided a one-pack type anti-glare paint which has both adhesion and flexibility to a molded article, has excellent anti-glare effect, oil and fat contamination prevention properties, and low temperature flexibility. The present invention can provide an antiglare coating composition for a polyolefin-based molded article having excellent coating film properties such as scratch resistance and discoloration wear resistance.

[Brief description of the drawings]

FIG. 1A is a cross-sectional explanatory view of an instrument panel with an airbag of an automobile according to a first embodiment, and FIG. 1B is a cross-sectional explanatory view when an airbag door is opened.

FIG. 2 is a plan view (a) of an instrument panel with an airbag of an automobile, a plan view (b) of an airbag door and a cross-sectional view thereof (c) in a conventional example.

[Explanation of symbols]

 1. . . Panel body, 11. . . Opening, 2. . . 2. airbag door, . . Coating, 5. . . Airbag,

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideaki Yoshida 100 Kanayama, Ichiriyama-cho, Kariya-shi, Aichi Prefecture Inside Toyota Auto Body Co., Ltd. Inside Industrial Co., Ltd. (72) Inventor Hiroyuki Arimoto 40th Odairadai, Satsuo-cho, Katsuta-gun, Okayama Prefecture Inside Ohashi Chemical Industry Co., Ltd. Inside (72) Inventor Keiichi Miyamoto 40 Taiheidai, Katsura-cho, Katsuta-gun, Okayama Prefecture F-term (reference) 4J038 CP051 CP052 CP071 CP072 CP111 CP112 DG112 KA20 MA13 MA14 NA01 NA05 NA11 NA12 NA19

Claims (4)

[Claims] 1. A mixture of at least three types of graft polymerization resins having different glass transition points, and at least two of the at least three types of graft polymerization resins include an acrylic resin component and a chlorinated polyolefin resin component. The resins A and B are graft-polymerized, and at least one of the at least three types of graft-polymerized resins is a resin C obtained by graft-polymerizing an acrylic resin component and a polyurethane resin component. Anti-glare coating composition for polyolefin molded articles. 2. The resin A according to claim 1, wherein one of the at least two resins A and B has a chlorine content in the olefin portion of 20 to 30% and a chlorinated polyolefin resin component content of the resin A in the range of 8 to 12%. % (Meaning by weight; the same applies hereinafter), a chlorinated polyolefin-grafted acrylic resin having a molecular weight of 70,000 to 90,000 and a glass transition point after modification of the chlorinated polyolefin of 70 to 90 ° C. B has an olefin content of 20 to 30%, a chlorinated polyolefin resin component content of the resin B of 20 to 30%, a molecular weight of 30,000 to 40,000, and a glass transition point after modification of the chlorinated polyolefin of 60 to 80. C is a chlorinated polyolefin-grafted acrylic resin, and the at least one resin C has an acrylic resin component of 5 to 30%, a molecular weight of 20,000 to 40,000, and a glass transition point. Is an acrylic graft polyurethane resin having a temperature of -60 to -20 ° C. 3. The method according to claim 2, wherein the mixing ratio (weight ratio; hereinafter the same) of the resin A, the resin B, and the resin C is 45 to 75: 9 to 25: 5 to 30. An antiglare coating composition for a polyolefin-based molded article, comprising: 4. The method according to claim 1, wherein:
The antiglare coating composition for a polyolefin-based molded article, wherein the antiglare coating composition is obtained by mixing hard polyurethane beads synthesized from a polyester urethane resin having a urethane bond at a stage prior to bead formation.