JPH0239951B2 - - Google Patents
Info
- Publication number
- JPH0239951B2 JPH0239951B2 JP59160759A JP16075984A JPH0239951B2 JP H0239951 B2 JPH0239951 B2 JP H0239951B2 JP 59160759 A JP59160759 A JP 59160759A JP 16075984 A JP16075984 A JP 16075984A JP H0239951 B2 JPH0239951 B2 JP H0239951B2
- Authority
- JP
- Japan
- Prior art keywords
- film
- modulus
- coating film
- young
- coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000011248 coating agent Substances 0.000 claims description 30
- 238000000576 coating method Methods 0.000 claims description 30
- 239000000463 material Substances 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 239000003973 paint Substances 0.000 description 22
- 239000004814 polyurethane Substances 0.000 description 7
- 229920002635 polyurethane Polymers 0.000 description 7
- 239000002987 primer (paints) Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000010422 painting Methods 0.000 description 4
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 3
- 239000012779 reinforcing material Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000012948 isocyanate Substances 0.000 description 2
- 150000002513 isocyanates Chemical class 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000006082 mold release agent Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004970 Chain extender Substances 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000037396 body weight Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- BXKDSDJJOVIHMX-UHFFFAOYSA-N edrophonium chloride Chemical compound [Cl-].CC[N+](C)(C)C1=CC=CC(O)=C1 BXKDSDJJOVIHMX-UHFFFAOYSA-N 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 238000010107 reaction injection moulding Methods 0.000 description 1
- 238000010133 reinforced reaction injection moulding Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Description
〔産業上の利用分野〕
本発明は強化材を混入して反応射出成形した所
謂強化反応射出成形、R−RIM(Reinforced
Reaction Injection Molding)による成形品の
塗装方法に関するものである。
〔従来技術〕
自動車部品であるバンパー等に使用されている
ポリウレタンは、一般にRIM成形、すなわち互
に反応する比較的低粘度の2種以上の化学的高活
性液体成分を、高圧注入機により密閉型中に混合
射出して化学反応を起させると同時に成形してい
るが、熱・吸水による寸法変化が大きいという欠
点を有している。そこで近年大型化したパンパー
や、ボデーの軽量化を目的として樹脂化が進めら
れているフエンダ等の外板部品にはスチールに近
い寸法安定性をもつことが要請されている。
このため例えばガラス繊維やマイカ等の強化材
を含有せしめたR−RIM成形品が脚光を浴びつ
つあるが、R−RIM成形品の問題点として従来
のRIM成形品の2コート塗装を施すと、上塗り
塗膜の表面に、上記強化剤の混入に帰因する微細
な凹凸(以下、これをチリチリ肌と称す。)が生
じ外観を損う結果となつている。
〔発明が解決しようとする問題点〕
本発明に課せられた問題点は上記チリチリ肌の
生じないR−RIM成形品の塗装方法を提供する
ことにある。
〔問題点を解決するための手段〕
本発明はR−RIM成形品の塗装に際し、素材
としてのR−RIM成形品に直接塗装する下塗り
塗膜または中間塗膜としてヤング率が180ないし
4000Kg/cm2の高ヤング率塗膜を設け、しかる後に
上塗り塗装することを特徴とする。
ポリウレタンの物理的性質は、出発原料の比率
や性質によつて非常に大きく変化する。本発明者
等は市販のポリウレタン塗料のなかから、異なる
ヤング率を有する塗膜を形成するものを選択し、
これらの塗料及びその市販塗料の主剤と硬化剤と
の混合比を変えた試作塗料を下塗り塗料または中
塗り塗料として使用することにより、ヤング率が
180ないし400Kg/cm2の塗膜を形成し得るものが、
チリチリ肌の消失に有効であることを見出した。
そのような塗料として、ポリエステル樹脂または
アクリル樹脂5部に対してイソシアネート樹脂ま
たはメラミン樹脂を1部以上混合して調製された
塗料が挙げられる。
〔作用〕
一般にRIM成形品は成形型から取出して離型
剤を洗浄除去した後に下塗り塗装(所謂プライマ
ー塗装)し、加熱乾燥して塗膜を硬化した後、上
塗り塗膜で被覆し、さらに熱処理して塗膜を硬化
させている。そして上記のプライマー(従来の下
塗り塗料)は素材と同質で付着性がよいこと、及
び低温で硬化させることが出来ること等の理由か
ら主としてウレタン塗料が用いられているが、こ
れらの塗料からなる塗膜はヤング率が約16Kg/cm2
程度と低く、このため塗料が伸びやすくてRIM
成形品に適用すると上塗り塗膜の加熱乾燥時での
素材の表面の強化材による凹凸の発生を直接的に
上塗り塗膜表面に伝えてしまうため、上塗り塗膜
に凹凸を生ぜしめる。
下塗り塗膜または中塗り塗膜としてヤング率が
180ないし4000Kg/cm2の塗膜を形成しておくと、
これら塗料は伸びにくいため強化材の凹凸を上塗
り塗膜表面に伝えず、チリチリ肌の消失に有効で
ある。なお後の実施例で述べる如く、180Kg/cm2
未満では効果がなく、4000Kg/cm2を越えても効果
に変りがない。
〔実施例〕
以下、本発明の実施例を図面を参照して説明す
る。
実施例 1
ポリオール、有機イソシアネート、鎖延長剤及
び触媒からなるポリウレタン原料90%にガラス短
繊維強化材10部を加え、高圧注入機で混合して平
板タイプの密閉金型中に射出し、ポリウレタン成
形品を得た。得られた成形品から離型剤を除去し
た後、長さ10cm、幅10cm、厚さ0.3cmの小片に切
断して得た11個の試験片(No.1〜No..11夫々に対
し市販の二液性ウレタン塗料から選定した下記第
4表に示す11種の塗料〜XIを膜厚20ないし
25μmに塗布し、100℃で30分間焼付けた。
[Industrial Application Field] The present invention relates to so-called reinforced reaction injection molding, R-RIM (Reinforced
This relates to a method of painting molded products using Reaction Injection Molding. [Prior art] Polyurethane used in automobile parts such as bumpers is generally produced by RIM molding, in which two or more chemically active liquid components with relatively low viscosity that react with each other are molded into a sealed mold using a high-pressure injection machine. Although the mixture is injected into the mold to cause a chemical reaction and is then molded at the same time, it has the disadvantage of large dimensional changes due to heat and water absorption. Therefore, outer panel parts such as pumpers, which have become larger in recent years, and fenders, which are being made of resin to reduce body weight, are required to have dimensional stability close to that of steel. For this reason, R-RIM molded products that contain reinforcing materials such as glass fiber and mica are gaining attention, but the problem with R-RIM molded products is that when two coats of conventional RIM molded products are applied, On the surface of the top coat, fine irregularities (hereinafter referred to as dusty skin) due to the incorporation of the above-mentioned reinforcing agent occur, resulting in a deterioration in appearance. [Problems to be Solved by the Invention] The problem faced by the present invention is to provide a method for coating R-RIM molded products that does not cause the above-mentioned dusty skin. [Means for Solving the Problems] When painting an R-RIM molded product, the present invention uses an undercoat film or an intermediate coat that is applied directly to the R-RIM molded product as a raw material, and has a Young's modulus of 180 or more.
It is characterized by providing a coating film with a high Young's modulus of 4000Kg/cm 2 and then applying a topcoat. The physical properties of polyurethanes vary greatly depending on the proportions and properties of the starting materials. The present inventors selected polyurethane paints from commercially available polyurethane paints that form coating films with different Young's moduli,
By using these paints and prototype paints with different mixing ratios of the main agent and curing agent of commercially available paints as undercoats or intermediate coats, the Young's modulus can be improved.
Those that can form a coating film of 180 to 400 kg/cm 2 are
It has been found to be effective in eliminating flaky skin.
Examples of such paints include paints prepared by mixing 1 or more parts of isocyanate resin or melamine resin with 5 parts of polyester resin or acrylic resin. [Function] In general, RIM molded products are removed from the mold, washed to remove the mold release agent, coated with an undercoat (so-called primer coating), heated and dried to harden the coating, coated with a topcoat, and then subjected to further heat treatment. to harden the coating. Urethane paints are mainly used for the above-mentioned primers (conventional undercoat paints) because they are the same as the material, have good adhesion, and can be cured at low temperatures. The Young's modulus of the membrane is approximately 16Kg/cm 2
Because of this, the paint spreads easily and RIM
When applied to a molded product, the unevenness caused by the reinforcing material on the surface of the material during heating and drying of the topcoat film is directly transmitted to the topcoat surface, resulting in unevenness in the topcoat film. Young's modulus as a base coat or intermediate coat
By forming a coating film of 180 to 4000Kg/ cm2 ,
Since these paints do not spread easily, they do not transmit the unevenness of the reinforcing material to the surface of the top coat, and are effective in eliminating dusty skin. Furthermore, as described in the later examples, 180Kg/cm 2
There is no effect if it is less than 4000Kg/cm2, and the effect remains the same even if it exceeds 4000Kg/ cm2 . [Example] Hereinafter, an example of the present invention will be described with reference to the drawings. Example 1 Add 10 parts of short glass fiber reinforcement to 90% polyurethane raw material consisting of polyol, organic isocyanate, chain extender, and catalyst, mix with a high-pressure injection machine, and inject into a flat plate type closed mold to form polyurethane. I got the item. After removing the mold release agent from the obtained molded product, it was cut into small pieces of 10 cm in length, 10 cm in width, and 0.3 cm in thickness. The 11 types of paints shown in Table 4 below selected from commercially available two-component urethane paints - XI were used with a film thickness of 20 to
It was applied to a thickness of 25 μm and baked at 100°C for 30 minutes.
【表】【table】
【表】
〓注〓 塗料、およびは、本発明の特
許出願後、それぞれ〓関西ペイント/ソ
レツクス100T〓、〓日本ビーケミカル/
R〓206〓および〓日本ビーケミカル/R〓
278〓として市販された。塗料XIは上塗
り用塗料である。
次にポリウレタン成形品の塗装に通常使用され
ている上塗り白色塗料(ポリエステル系塗料、日
本ビーケミカル社製/フレキセン101)を膜厚3
0ないし35μmに塗布した後、120℃で40分間の
焼付けを行なつた。そしてこれらの試験片につき
豊田中央び研究所製グロステスタ−TRDC−2
を用いてグロス値を測定し、目視評価を行なつ
た。また別に、前記の11種の塗料を平板に流し硬
化後剥離して得た厚さ50ないし60μmの調製塗膜
につき下記の試験条件でヤング率を測定した結果
を上記のグロス値等とともに第1表に示す。
ヤング率測定条件
測定機…テンシロンUTM−2−SS−105D−B
(東洋ボールドウイン社製)
試料長…10mm×40mm
試料膜厚…50〜60μm
引張り速度…50mm/min
測定温度…20℃[Table] Note: After the patent application for the present invention, paints and paints are respectively Kansai Paint/Solution.
Letkus 100T〓,〓Nippon B Chemical/
R〓206〓 and〓Nippon B Chemical/R〓
It was marketed as 278〓. Paint XI is a top coat paint.
Next, apply a topcoat white paint (polyester paint, manufactured by Nippon B Chemical Co., Ltd./Flexene 101), which is usually used for painting polyurethane molded products, to a film thickness of 3.
After coating from 0 to 35 μm, baking was performed at 120° C. for 40 minutes. For these test pieces, a gloss tester TRDC-2 manufactured by Toyota Chuobi Research Institute was used.
The gloss value was measured using a 2000-2000 and visual evaluation was performed. Separately, Young's modulus was measured under the following test conditions for a prepared coating film with a thickness of 50 to 60 μm obtained by pouring the above 11 types of paint onto a flat plate and peeling it off after curing. Shown in the table. Young’s modulus measurement conditions Measuring device…Tensilon UTM-2-SS-105D-B
(Manufactured by Toyo Baldwin Co., Ltd.) Sample length...10mm x 40mm Sample film thickness...50-60μm Tensile speed...50mm/min Measurement temperature...20℃
【表】【table】
【表】
註 ○:平滑な塗膜
△:完全に平滑ではない塗膜
×:チリチリ肌の塗膜
上記の結果からR−RIM成形品の素材面に直
接にヤング率180ないし4000Kg/cm2の高ヤング率
塗膜を形成させれば上塗り塗膜からチリチリ肌を
消失せしめ得ることが判つた。
第1図はこのような2コート塗膜の模式断面図
を表わし、1はR−RIMの素材、2は高ヤング
率塗膜、3は上塗り塗膜を示す。
実施例 2
実施例1で得たと同様な試験片(No.12〜22)の
表面に、従来から使用されているブライマー用ウ
レタン塗料を(日本ビーケミカル社製/ブレキセ
ン600)を厚さ20ないし25μmに塗布し、
100℃で30分間焼付けた後、実施例1で行なつた
と同様な2コート塗装を施こし、第2図で示すよ
うな3コート塗膜を得た。この3コート塗膜につ
き、実施例1と同様な試験を行なつた結果を第2
表に示す。なお4はプライマー塗膜を示す。[Table] Note: ○: Smooth coating film △: Coating film that is not completely smooth ×: Coating film with scratchy skin From the above results, the material surface of the R-RIM molded product can be directly coated with a Young's modulus of 180 to 4000 Kg/cm 2 . It has been found that by forming a coating film with a high Young's modulus, it is possible to eliminate the dusty skin from the top coating film. FIG. 1 shows a schematic cross-sectional view of such a two-coat film, where 1 shows the R-RIM material, 2 shows the high Young's modulus film, and 3 shows the top coat film. Example 2 The surface of the same test pieces (Nos. 12 to 22) as obtained in Example 1 was coated with a conventionally used urethane paint for brimers (Brexen 600, manufactured by Nippon B Chemical Co., Ltd.) to a thickness of 20 to 20 mm. Apply to 25μm,
After baking at 100° C. for 30 minutes, a two-coat coating similar to that in Example 1 was applied to obtain a three-coat coating as shown in FIG. A test similar to that of Example 1 was conducted on this three-coat film, and the results were summarized in the second example.
Shown in the table. Note that 4 indicates a primer coating film.
【表】【table】
【表】
上記の結果から高ヤング率塗膜2の下にプライ
マー塗膜4を設けても効果に変りがないことが判
る。
実施例 3
実施例2におけるプライマー塗膜4と高ヤング
率塗膜2の重ね方の順序を変えた以外は実施例2
と同様にして、試験片(No.23〜No.33)に3コート
塗膜を施こし、実施例2と同様な試験を行なつた
結果を第3表に示す。[Table] From the above results, it can be seen that there is no difference in the effect even if the primer coating film 4 is provided under the high Young's modulus coating film 2. Example 3 Example 2 except that the order of stacking the primer coating film 4 and the high Young's modulus coating film 2 in Example 2 was changed.
In the same manner as above, test pieces (No. 23 to No. 33) were coated with 3 coats, and the same tests as in Example 2 were conducted. The results are shown in Table 3.
上記の如くR−RIM成形品の塗装に際し、上
塗り塗膜と素材との間にヤング率180ないし4000
Kg/cm2の塗膜を設けることにより上塗り塗膜のチ
リチリ肌をなくし、外観品質を高めることができ
る。また従来のプライマー塗膜に代えて上記の高
ヤング率塗膜を設けるならば従来と同じ2コート
塗装で品質のよい製品が得られることになり製造
コストの面で有利である。
As mentioned above, when painting R-RIM molded products, the Young's modulus between the top coat and the material is 180 to 4000.
By providing a coating film of Kg/cm 2 , it is possible to eliminate the dusty skin of the top coat film and improve the appearance quality. Furthermore, if the above-mentioned high Young's modulus coating is provided in place of the conventional primer coating, a high-quality product can be obtained with the same two-coat coating as in the conventional method, which is advantageous in terms of manufacturing costs.
第1図は実施例1の塗膜の模式断面図を表わ
し、第2図は実施例2の塗膜の膜式断面図を表わ
し、第3図は実施例3の塗膜の模式断面図を表わ
し、第4図は高ヤング率塗膜のヤング率と上塗り
塗膜のグロス値及び目視評価との関係を示すグラ
フを表わす。
図中、1……素材、2……高ヤング率塗膜、3
……上塗り塗膜、4……プライマー塗膜。
FIG. 1 shows a schematic cross-sectional view of the coating film of Example 1, FIG. 2 shows a film-type cross-sectional view of the coating film of Example 2, and FIG. 3 shows a schematic cross-sectional view of the coating film of Example 3. FIG. 4 is a graph showing the relationship between the Young's modulus of the high Young's modulus coating film and the gloss value and visual evaluation of the top coating film. In the figure, 1...Material, 2...High Young's modulus coating, 3
...Top coat film, 4...Primer film.
Claims (1)
膜としてヤング率が180ないし4000Kg/cm2の高ヤ
ング率塗膜を設け、しかる後に上塗り塗装するこ
とによつて、該上塗り塗膜におけるチリチリ肌の
発生を防止することを特徴とする強化反応射出成
形品の塗装方法。1. By providing a high Young's modulus coating film with a Young's modulus of 180 to 4000 Kg/cm 2 as an undercoat film or intermediate coating film that is applied directly to the material, and then applying a top coat, it is possible to eliminate the dusty skin in the top coat film. A method for coating reinforced reaction injection molded products characterized by preventing the occurrence of such occurrence.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16075984A JPS6138665A (en) | 1984-07-31 | 1984-07-31 | Coating method of reinforced reaction injection molded article |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16075984A JPS6138665A (en) | 1984-07-31 | 1984-07-31 | Coating method of reinforced reaction injection molded article |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6138665A JPS6138665A (en) | 1986-02-24 |
JPH0239951B2 true JPH0239951B2 (en) | 1990-09-07 |
Family
ID=15721846
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16075984A Granted JPS6138665A (en) | 1984-07-31 | 1984-07-31 | Coating method of reinforced reaction injection molded article |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6138665A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0431060U (en) * | 1990-07-10 | 1992-03-12 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992015729A1 (en) * | 1990-02-09 | 1992-09-17 | E.I. Du Pont De Nemours And Company | Method of improving the properties of coated reinforced thermoplastic articles and products obtained thereby |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59159834A (en) * | 1983-03-01 | 1984-09-10 | Nissan Motor Co Ltd | Formation of coating film on rim for use in automobile outside plate |
-
1984
- 1984-07-31 JP JP16075984A patent/JPS6138665A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59159834A (en) * | 1983-03-01 | 1984-09-10 | Nissan Motor Co Ltd | Formation of coating film on rim for use in automobile outside plate |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0431060U (en) * | 1990-07-10 | 1992-03-12 |
Also Published As
Publication number | Publication date |
---|---|
JPS6138665A (en) | 1986-02-24 |
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