JP2001152078A - Coating composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating composition of a one liquid type coating material, capable of directly coating a one unit molded product of a PP resin and TPO resin, having an excellent adhering property, excellent in oil and fat-soiling resistance and a coating material stability, and having a bending property capable of following the flexibility of the TPO resin. SOLUTION: This coating Q composition contains (a) a chlorinated polyolefin modified resin, (b) a soft component and (c) a soft filler as essential components, wherein (a) is a resin obtained by polymerizing (e) a vinyl monomer mixture in the presence of (d) a chlorinated polyolefin, (d) has 15-50 wt.% chlorine content and (e) is a monomer mixture of >=1 kind selected from the other monomers copolymerizable with a (meth)acrylic acid ester or the chlorinated polyolefin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a coating composition that can be used for both a polypropylene resin and a polyolefin-based thermoplastic elastomer resin.

[0002]

2. Description of the Related Art As shown in FIG. 2, an instrument panel 2 integrated with an airbag cover of an automobile comprises an instrument panel main body 21 and an airbag cover 22.
One opening is formed integrally. A relatively hard polypropylene (hereinafter abbreviated as PP) resin is used for the instrument panel main body 21 which requires strength, and a soft airbag cover 22 which needs to be deployable when the airbag inflates is used. Polyolefin-based thermoplastic elastomer (hereinafter abbreviated as TPO) resin is used.

The following two kinds of paints are required for painting the instrument panel 2 integrated with the airbag cover. The instrument panel body 21 contains a chlorinated polyolefin resin, a mixture of a chlorinated polyolefin resin and an acrylic resin, or a one-pack liquid for a PP resin composed of a copolymer of a chlorinated polyolefin and a (meth) acrylate. Use a mold lacquer paint.

On the other hand, the airbag cover 22 is composed of a chlorinated polyolefin-modified hydroxyl-containing acrylic copolymer obtained by copolymerizing a chlorinated polyolefin with an acrylic monomer having a hydroxyl group, and an isocyanate compound as essential components. A two-pack type paint for TPO resin is used.

[0005]

As described above, PP resin and TPO
Coating of an integrally molded product made of resin requires two types of paints and two or more coating steps, which increases costs. Further, a difference in color tone may occur due to a difference in paint between the PP resin and the TPO resin. For this reason, there has been a problem that the appearance is deteriorated particularly in an integrally molded product used for a design surface.

If a one-component lacquer coating for PP resin is applied to an integrally molded product made of PP resin and TPO resin, the coating film cannot follow the flexibility of TPO resin.
There is a possibility that the coating film cracks due to aging deterioration or the like. In particular,
When one-pack lacquer paint for PP resin is used for the instrument panel integrated with the airbag cover of a car,
When the airbag is deployed, fragments of the coating film may be scattered, which may cause a safety problem. This problem occurs because the one-component lacquer coating for the PP resin uses a main resin having a high glass transition point in order to maintain the adhesion of the coating film to the PP resin, the resistance to oil and fat contamination, and the like.

In order to solve the above-mentioned problem, a one-component lacquer paint for PP resin may contain a main resin having a low glass transition point in order to impart flexibility that can follow TPO resin. However, the obtained paint was used with PP resin and T
When used for an integrally molded product made of PO resin,
A decrease in the adhesion to the P resin and a decrease in grease contamination resistance occur. The grease-resistant stain resistance refers to a property of preventing grease such as hand oil of a human body from migrating to a coating film and softening or peeling the coating film.

Further, contrary to the above description, PP resin and T
It is also conceivable to apply a two-component paint for TPO resin to an integrally molded product made of PO resin. However, PP
A primer is required to obtain the adhesion of the coating film to the resin. In addition, since it is necessary to mix a crosslinking agent before use of the paint, handling becomes complicated. In addition, there is a problem in the stability of the coating, such as the limited usable time of the coating after blending the crosslinking agent. For the above reasons, two-pack paints tend to be disadvantageous in terms of paint material costs and coating processing costs as compared with one-pack lacquer paints.

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and is a one-pack type coating material comprising a PP resin and a TP.
It can be applied directly to an integrally molded product with O-resin, has excellent adhesion to the integrally molded product, and has excellent oil and grease stain resistance, excellent paint stability, and can follow the flexibility of TPO resin. It is an object of the present invention to provide a coating composition having excellent flexibility.

[0010]

The invention according to claim 1 is a coating composition comprising (a) a chlorinated polyolefin-modified resin, (b) a soft component and (c) a soft filler as essential components. (A) is a resin obtained by polymerizing (e) a vinyl monomer mixture in the presence of (d) a chlorinated polyolefin, and (d) has a chlorine content of 15 to 50.
(E) is a mixture of at least one monomer selected from (meth) acrylate monomers or other monomers copolymerizable with chlorinated polyolefins. And a coating composition.

The most remarkable feature of the present invention is that the above-mentioned substances (a) to (c) are used as essential components.

As the above (d), it is preferable to use chlorinated polypropylene, chlorinated polyethylene, chlorinated polypropylene-ethylene copolymer, chlorinated polyethylene-vinyl acetate, and a mixture of these various chlorinated polyolefins. Examples of the chlorinated polyolefin include Supercron 832L and Supercron 892.
L (both manufactured by Nippon Paper Industries Co., Ltd.), Hardlen 14-L
Various commercially available chlorinated polyolefin resins such as LB and Hardlen 14-MLJ (all manufactured by Toyo Kasei Kogyo Co., Ltd.) can be used.

Further, (d) has a chlorine content of 15 to 50.
% By weight. If the chlorine content exceeds 50% by weight, the adhesion to polyolefin resin (both PP resin and TPO resin) may be reduced. When the content is less than 15% by weight, the solubility in a solvent is reduced, and the compatibility with the (meth) acrylate-based copolymer used as (e) is lacking, and the stability of the coating material is reduced. There is a risk. The details of (e) will be described later.

As the above (b), for example, a soft acrylic resin, a soft urethane resin, a soft polyester resin, a plasticizer and the like can be used. Examples of the soft acrylic resin include Agridic A-157 and Agridic DL-967 (both from Dainippon Ink and Chemicals, Inc.)
And Vernock 16-4 as the soft urethane resin.
16 (manufactured by Dainippon Ink and Chemicals, Inc.); Nipporan 1004 (manufactured by Nippon Polyurethane Industry Co., Ltd.) as a soft polyester resin; and Polysizer W-2040 (manufactured by Dainippon Ink and Chemicals, Inc.) as a plasticizer ))). Each of these various soft resins and plasticizers can be used in combination.

As the above (c), acrylic beads, urethane beads, olefin beads and the like can be used. Specifically, as acrylic beads, M
4R-7G (manufactured by Soken Chemical Co., Ltd.), urethane beads include Art Pearl C-800 (manufactured by Negami Industry Co., Ltd.),
As olefin beads, High Flat T-15P-
2 (manufactured by Gifu Shellac Manufacturing Co., Ltd.), etc., and one or more of these various beads can be used in combination.

Next, the operation of the present invention will be described. First, (a) the chlorinated polyolefin-modified resin becomes the paint base resin of the paint composition according to the present invention, which is a feature of the one-pack lacquer paint. Therefore, the coating composition of the present invention can be provided with a feature that coating can be performed directly without using a primer or the like. In addition, since it is a one-pack type, there is no need for a compounding step of a cross-linking agent or the like before use, and there is little limitation on the usable time of the paint, and it is possible to impart characteristics such as easy handling and excellent workability.

(D) Adhesion to a PP resin and adhesion to a TPO resin can be ensured by the intermolecular force of the chlorinated polyolefin. Further, in the above (d), since the chlorine content is 15 to 50% by weight, the paint stability is good, and stable adhesion to the polyolefin resin can be obtained.

Further, as shown in FIG. 1 (B), the coating composition comprising only the above (a) is in a state in which the polymer of only the relatively hard component (a) is intertwined.
As shown in FIG. 1 (A), (a) is replaced by (b) or (c).
Is added, the polymers (a) and (b) are entangled, and (c) is uniformly dispersed. As described above, since the coating composition of the present invention contains the materials (b) and (c), the coating film can have flexibility and flexibility.

As described above, according to the present invention, a one-pack type paint, which can be directly applied to an integrally molded product of a PP resin and a TPO resin, has excellent adhesion to the integrally molded product. With excellent oil and fat stain resistance and paint stability.
A coating composition having excellent flexibility so as to follow the flexibility of a resin can be provided.

Further, according to the present invention, it is not necessary to use a paint of a different component according to the material for the integrally molded article, so that there is no need to perform color matching of the paint, and it is possible to adjust the color tone and gloss between parts. Indentation can be made unnecessary.

The coating composition according to the present invention can contain various additives and solvents as components other than the above (a) to (c). For example, as shown in Table 1 to be described later, pigments, pigment dispersants, additives such as carbon black, and solvents such as toluene.

Next, as in the second aspect of the present invention, the chlorinated polyolefin (d) is preferably a chlorinated α-olefin homopolymer or copolymer. This makes it easier to dissolve in the hydrocarbon-based solvent and makes it easier to make a paint.

As the homo-copolymer of the α-olefin, for example, a homo-copolymer such as ethylene, propylene, 1-butene and 3-methyl-1-pentene can be used. Further, as the α-olefin copolymer,
Copolymers such as ethylene-vinyl acetate, ethylene-butadiene, and ethylene-acrylate can be exemplified.

Next, as in the third aspect of the present invention, the (meth) acrylate monomer in the (e) vinyl monomer mixture is an alkyl (α) or (α) of (meth) acrylic acid. The β-ethylenically unsaturated carboxylic acid and the other copolymerizable monomer are preferably at least one selected from styrene derivatives and vinyl esters. As a result, a stable adhesive force is maintained,
Good film properties can be exhibited.

As the alkyl of the (meth) acrylic acid, (meth) acrylate monomers include methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate and iso-butyl ( Meth) acrylate, tert-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate,
Cyclohexyl (meth) acrylate and the like can be used. Further, as the α, β-ethylenically unsaturated carboxylic acid, cycloalkyl ester (meth) acrylic acid, maleic acid, phthalic acid, itaconic acid and the like can be used.

As the styrene derivative, styrene, α-methylstyrene, vinyltoluene and the like can be used. In addition, as the vinyl ester,
Vinyl acetate, vinyl propionate and the like can be used. These substances can be used in combination by selecting one or more selected from each group.

Further, as in the invention according to the fourth aspect, the ratio of the polymerization of the (d) chlorinated polyolefin and the (e) vinyl monomer mixture is as follows.
It is preferable that the solid content of (e) is 95 to 50 parts by weight based on 50 to 50 parts by weight. Thereby, stable adhesion to the PP resin and resistance to oil and fat contamination can be obtained.
When the solid content of (d) is less than 5 parts by weight ((e) is 95%)
(Parts by weight), the adhesion to the PP resin may be reduced. On the other hand, if the solid content exceeds 50 parts by weight ((e) becomes less than 50 parts by weight), the oil and fat stain resistance of the coating film may be reduced.

Next, as in the invention as set forth in claim 5, the content of the soft component (b) with respect to the (a) chlorinated polyolefin-modified resin is 5 to 70 parts by weight based on 100 parts by weight of the solid content. It is preferred that Thereby, the adhesiveness is good, and it can follow the elongation of the material.
If (b) is less than 5 parts by weight, the flexibility and flexibility of the coating film may be reduced. Further, when it exceeds 70 parts by weight, there is a possibility that the adhesiveness is reduced. A particularly preferred lower limit is 20 parts by weight. A more preferred upper limit is 60 parts by weight.

Next, as in the invention according to claim 6, the content of the soft filler (c) relative to the (a) chlorinated polyolefin-modified resin is 2 to 50 parts by weight based on 100 parts by weight of the solid content. It is preferred that Thereby, without lowering the glass transition point of the resin (a),
The effect of improving flexibility can be obtained. If (c) is less than 2 parts by weight, sufficient flexibility and flexibility may not be obtained. On the other hand, if it exceeds 50 parts by weight, the oil and fat contamination resistance may be reduced. A particularly preferred lower limit is 10 parts by weight. A more preferred upper limit is 40 parts by weight.

The coating composition according to the present invention is particularly preferably used for coating an instrument panel integrated with an airbag cover for a vehicle such as an automobile. The instrument panel is an integrally molded product in which a PP resin is used for an instrument panel body that requires strength, and a soft TPO resin is used for an airbag cover that requires deployability when the airbag is inflated.

By coating the instrument panel with the coating composition according to the present invention, in addition to the above-described effects according to the present invention, a coating film fragment generated due to a coating film crack of the airbag cover when the airbag is deployed. Can be prevented, and a safe airbag cover can be obtained. Furthermore, since the coating film can have flexibility and flexibility, an airbag cover having excellent functionality when the airbag is deployed can be obtained.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments A coating composition according to an embodiment of the present invention and its performance will be described. The coating composition of this example contains (a) a chlorinated polyolefin-modified resin, (b) a soft component, and (c) a soft filler as essential components. The above (a)
(D) a resin obtained by polymerizing (e) a vinyl monomer mixture in the presence of a chlorinated polyolefin; (d) having a chlorine content of 15 to 50% by weight; It is a mixture of one or more monomers selected from meth) acrylate monomers or other monomers copolymerizable with chlorinated polyolefins.

A coating composition according to this example was prepared and its performance was evaluated as follows. As shown in Table 1,
A paint composition was prepared in each of the formulations A-1 to A-9, and as shown in FIG. 2, the instrument panel 2 in the instrument panel 2 integrated with an airbag cover of an automobile.
A test piece made of the same PP resin as that of No. 1 and a test piece made of the same TPO resin as the airbag cover 22 were coated so that the coating thickness became 15 to 20 μm, and dried at 70 ° C. for 10 minutes. These were subjected to a coating film physical property test.

In each of the coating compositions A-1 to A-9,
(A) As chlorinated polyolefin modified resin, chlorinated P
P-modified acrylic resin was used. This is a resin produced by polymerizing (e) methyl (meth) acrylate, which is a vinyl monomer mixture, in the presence of (d) polypropylene having a chlorine content of 30%, which is a chlorinated polyolefin.

Further, (b) one of soft polyester resin, soft urethane resin and soft acrylic resin is used as the soft component, and (c) one of urethane beads, olefin beads and acrylic beads is used as the soft filler. did. As other components, a pigment dispersant (Kusumoto Kasei Co., Ltd. Dispalon DA703-5)
0), carbon black (MA-10 manufactured by Mitsubishi Kasei Corporation)
0), toluene as a solvent was used. The numerical values in Table 1 are numerical values indicating parts by weight based on 100 parts by weight of the coating composition. Numerical values in parentheses indicate the solid ratio of each component to 100 parts by weight of the solid content of the chlorinated PP-modified acrylic resin.

Next, a method for testing physical properties of the coating film will be described. The coating film adhesion test will be described. 1mm on painted surface
Make 100 grid-shaped notches that reach the substrate at regular intervals, and then attach cellophane tape sufficiently on top of them, and then
The film was peeled off in the direction of 80 degrees, and the degree of the remaining coating film was evaluated. As a criterion, a state where one of the 100 grids did not peel off was regarded as a pass. Further, after the test piece was left in an atmosphere of 50 ° C. and a relative humidity of 95% for 240 hours, a similar adhesion test was carried out.

Next, the oil / fat stain resistance test will be described. A certain amount of tallow (Nacalai Desk Co., Ltd. chemical tallow) is applied to the coated surface of the test piece per unit coating area.
Place a flannel cloth of the same size as the test piece on top
After standing in an atmosphere at a temperature of 7 ° C. for 7 days, tallow was removed using a small amount of neutral detergent. Then, a coating adhesion test using cellophane tape and a coating abrasion test using a friction tester were performed. The coating film adhesion test using a cellophane tape was performed in the same manner as described above. In the coating film abrasion test, a gauze was used as a friction element, and the friction element was put on the coated surface at a load of 40.09 kPa and reciprocated 200 times. The criterion was passed when no peeling of the coating film was observed in the adhesion test and when no bare body was exposed in the abrasion test.

Next, the coating film flexibility test will be described.
The test piece was bent along the outer circumference of a cylinder having a diameter of 110 mm and 65 mm with the coating film outward, and the presence or absence of cracks in the coating film was visually observed. Criterion is 110mm and 65
When no cracks were observed in both mm and both conditions, the test was passed.

Next, the paint stability test will be described.
The sample was placed in a sealed can and left in a constant temperature bath at 50 ° C. and −5 ° C. for 7 days, after which the paint was observed for the presence of gelled products and precipitates. The criterion was passed when no gelled product or precipitate was observed.

Next, the airbag deployment test will be described. As shown in FIG. 2, A-1 to A-9 were attached to the airbag cover-integrated instrument panel 2 under the same conditions as the test pieces.
Was applied and dried. Thereafter, the airbag was deployed under the condition that the surface temperature of the coating film was −30 ° C., and the scattering of the coating film was observed using a high-speed video camera. The criterion was passed when no scattering of the coating film was observed.

Next, the above test results will be described.
A-1 in Table 1 does not include (b) and (c) according to the present invention, A-2 does not include (c), and A-3 does not include (b). For these, the coating film adhesion test, grease stain resistance test, and paint stability test passed. However, the coating film flexibility was rejected. Further, the coating compositions A-4 to A-9 contain any of the components (a) to (c) according to the present invention, and include a coating film adhesion test, a grease stain resistance test, and a coating film bending test. Each test passed the performance test, paint stability test, and airbag deployment test.

Next, the operation of this embodiment will be described. (A)
Is the base resin of the coating composition of the present example, so that the object to be coated can be directly coated without using a primer or the like. In addition, since it is a one-pack type, there is no need for a compounding step of a cross-linking agent or the like before use, and there is little restriction on the usable time of the paint, and the above paint stability test was passed. Therefore, it is easy to handle and excellent in workability.
Also, due to the intermolecular force of (d) chlorinated polyolefin, P
The adhesion to the P resin and the adhesion to the TPO resin were secured, and the film passed the above-mentioned coating film adhesion test.

As shown in FIG. 1 (b), the coating composition consisting only of the above (a) is in a state where the polymer of only the relatively hard component (a) is intertwined. As shown in (), by adding (b) and (c) to (a), the polymers (a) and (b) are entangled and (c) is uniformly dispersed.

That is, the coating composition of this example is (b)
Since the material (c) was included, the coating film could have flexibility and flexibility, and passed the above-described coating film flexibility. In addition, since the composition contained the material according to (c), the composition passed the above-described oil and fat contamination resistance.

As described above, according to the present embodiment, it is a one-pack type paint, which can be directly applied to an integrally molded product of PP resin and TPO resin, and has excellent adhesion to the integrally molded product. With excellent oil and fat stain resistance and paint stability.
A coating composition having excellent flexibility so as to follow the flexibility of the PO resin can be obtained.

Further, in addition to the above-described excellent performance, the coating composition according to this embodiment is used for painting the instrument panel 2 with the airbag cover as shown in FIG. It is possible to prevent the scattering of paint film fragments generated from the paint film crack of the bag cover,
A safe airbag cover can be obtained. Furthermore, since the coating film can have flexibility and flexibility, an airbag cover having excellent functionality when the airbag is deployed can be obtained.

[0047]

[Table 1]

[0048]

As described above, according to the present invention, a one-pack type paint can be directly applied to an integrally molded product of a PP resin and a TPO resin, and is superior to an integrally molded product. The present invention can provide a paint composition having excellent adhesion, excellent oil and fat stain resistance, excellent paint stability, and excellent flexibility to follow the flexibility of the TPO resin.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram of a coating film composed of a coating composition according to an embodiment of the present invention, and FIG.

FIG. 2 is a perspective view of an instrument panel integrated with an airbag cover in the embodiment.

[Explanation of symbols]

2. . . Airbag cover integrated instrument panel,

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) C08F 220: 10 C08F 220: 10 212: 08) 212: 08) (C08F 255/00 (C08F 255/00 220) : 10 220: 10 218: 04) 218: 04) (72) Inventor Hideaki Yoshida 100 Kanayama, Ichiriyama-cho, Kariya-shi, Aichi Prefecture Inside Toyota Auto Body Co., Ltd. (72) Inventor Tsutomu Nemoto Sakurada, Washinomiya-cho, Kita-Katsushika-gun, Saitama 5, 13-1, Fujikura Kasei Co., Ltd., Development Laboratory (72) Inventor Toshiaki Okazaki, 5-13-1, Sakurada, Washinomiya-cho, Kita-Katsukashi-gun, Saitama Prefecture Fujikura Kasei Co., Ltd., Development Laboratory (72) Inventor Hiroyuki Kai, Kita-Katsukashi, Saitama 5-13-1, Sakurada, Washinomiya-cho, Gunma F-term in Fujikura Kasei Co., Ltd. F-term (reference) 4J002 BB01Y BG03X BG03Y BN10W CF00X CK02X CK02Y FA08Y GH01 4J026 AA24 AC36 BA05 BA19 B A20 BA24 BA25 BA26 BA27 BB02 BB03 CA01 CA06 FA04 GA06 4J038 CB002 CB141 CB171 CG142 DG002 FA042 FA062 FA122 KA08 KA20 NA05 NA12 PB07 PC08

Claims (6)

[Claims] (1) a chlorinated polyolefin-modified resin,
A coating composition comprising (b) a soft component and (c) a soft filler as an essential component.
(D) a resin obtained by polymerizing (e) a vinyl monomer mixture in the presence of a chlorinated polyolefin; (d) having a chlorine content of 15 to 50% by weight; A coating composition comprising a mixture of one or more monomers selected from (meth) acrylate monomers and other monomers copolymerizable with chlorinated polyolefins. 2. The coating composition according to claim 1, wherein said (d) chlorinated polyolefin is obtained by chlorinating a homopolymer or copolymer of an α-olefin. 3. The method of claim 1, wherein the (meth) acrylate monomer in the (e) vinyl monomer mixture is an alkyl (meth) acrylate or an α, β-ethylenically unsaturated monomer. A coating composition, which is a saturated carboxylic acid and wherein the other copolymerizable monomer is at least one selected from styrene derivatives and vinyl esters. 4. The method according to claim 1, wherein:
The ratio of the polymerization of the above (d) chlorinated polyolefin and the above (e) vinyl monomer mixture is such that the solid content of (e) is 95 to 50 parts by weight based on 5 to 50 parts by weight of the solid content of (d). A coating composition characterized by being in parts by weight. 5. The method according to claim 1, wherein:
A coating composition, wherein the content of the soft component (b) with respect to the chlorinated polyolefin-modified resin (a) is 5 to 70 parts by weight based on 100 parts by weight of a solid content. 6. The method according to claim 1, wherein:
A coating composition, wherein the content of the soft filler (c) with respect to the (a) chlorinated polyolefin-modified resin is 2 to 50 parts by weight based on 100 parts by weight of solids.