JPH0252712A - Molded product with few hot water crease - Google Patents
Molded product with few hot water creaseInfo
- Publication number
- JPH0252712A JPH0252712A JP20313788A JP20313788A JPH0252712A JP H0252712 A JPH0252712 A JP H0252712A JP 20313788 A JP20313788 A JP 20313788A JP 20313788 A JP20313788 A JP 20313788A JP H0252712 A JPH0252712 A JP H0252712A
- Authority
- JP
- Japan
- Prior art keywords
- molded product
- hot water
- injection molding
- crease
- resin composition
- 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.)
- Granted
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title abstract description 19
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000001746 injection moulding Methods 0.000 claims abstract description 14
- 239000011342 resin composition Substances 0.000 claims abstract description 11
- 229920005989 resin Polymers 0.000 claims abstract description 7
- 239000011347 resin Substances 0.000 claims abstract description 7
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 5
- LYRFLYHAGKPMFH-UHFFFAOYSA-N octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(N)=O LYRFLYHAGKPMFH-UHFFFAOYSA-N 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 229940037312 stearamide Drugs 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 6
- -1 amide stearate Chemical class 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract 1
- 230000037303 wrinkles Effects 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 7
- 238000000465 moulding Methods 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 3
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 2
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 2
- 150000001408 amides Chemical class 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- HSEMFIZWXHQJAE-UHFFFAOYSA-N hexadecanamide Chemical compound CCCCCCCCCCCCCCCC(N)=O HSEMFIZWXHQJAE-UHFFFAOYSA-N 0.000 description 2
- 239000006082 mold release agent Substances 0.000 description 2
- GLDOVTGHNKAZLK-UHFFFAOYSA-N octadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCCCO GLDOVTGHNKAZLK-UHFFFAOYSA-N 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 238000005453 pelletization Methods 0.000 description 2
- 230000000379 polymerizing effect Effects 0.000 description 2
- ORAWFNKFUWGRJG-UHFFFAOYSA-N Docosanamide Chemical compound CCCCCCCCCCCCCCCCCCCCCC(N)=O ORAWFNKFUWGRJG-UHFFFAOYSA-N 0.000 description 1
- 229920001890 Novodur Polymers 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002191 fatty alcohols Chemical class 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- GOQYKNQRPGWPLP-UHFFFAOYSA-N n-heptadecyl alcohol Natural products CCCCCCCCCCCCCCCCCO GOQYKNQRPGWPLP-UHFFFAOYSA-N 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は樹脂組成物を射出成形して得られる外観の優れ
た成形品に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a molded article with an excellent appearance obtained by injection molding a resin composition.
従来から、スチレン系樹脂はオーディオテープのカセッ
トや各種ケース等の成形品に射出成形して使用されてき
た。しかしながら射出成形の金型のゲートが小さかった
り、流動距離が長いときは成形品の表面に「湯シワ」と
称する波状の模様が発生し、商品価値を滅じていた。こ
の場シワは成形圧力を高くしたり、成形温度を高くした
りして軽減する事は可能であるが、完全になくす事は非
常に困難であった。Conventionally, styrene resins have been used by injection molding into molded products such as audio tape cassettes and various cases. However, when the injection mold gate is small or the flow distance is long, a wavy pattern known as ``water wrinkles'' appears on the surface of the molded product, reducing its commercial value. In this case, wrinkles can be reduced by increasing the molding pressure or molding temperature, but it is extremely difficult to eliminate them completely.
本発明は湯シワの発生がない成形品を提供することを目
的とする。An object of the present invention is to provide a molded product that does not have hot water wrinkles.
本発明者はこの様な問題点、即ち湯シワを解決すべく鋭
意検討した結果、特定の組成を存するスチレン系樹脂組
成物を使用して射出成形を行う事により、湯シワの発生
がない成形品が得られる事を見出し、本発明を完成した
。As a result of intensive studies to solve this problem, that is, hot water wrinkles, the inventors of the present invention have found that by performing injection molding using a styrene resin composition having a specific composition, molding without hot water wrinkles can be achieved. The present invention was completed based on the discovery that it is possible to obtain a product with high quality.
即ち、本発明はゲート径０．ｈｍ以下又は最大流動長と
平均肉厚の比（以下Ｌ／Ｔと略記する）が１００以上の
射出成形用金型を用いて熱可塑性樹脂を射出成形する事
によって得られる成形品であって、使用する熱可塑性樹
脂がスチレン系樹脂１００重量部とステアリン酸アミド
０．１〜１．０重量部とからなる樹脂組成物である事を
特徴とする成形品・を提供するものである。That is, the present invention has a gate diameter of 0. A molded product obtained by injection molding a thermoplastic resin using an injection mold with a ratio of hm or less or a maximum flow length to average wall thickness (hereinafter abbreviated as L/T) of 100 or more, The present invention provides a molded article characterized in that the thermoplastic resin used is a resin composition consisting of 100 parts by weight of a styrene resin and 0.1 to 1.0 parts by weight of stearamide.
本発明の成形品はゲート径０．ｈｍ以下又はＬ／Ｔが１
００以上の射出成形用金型を用いて射出成形する事によ
って得られる成形品である。即ちゲート径が０．８ｍｍ
を越える金型、あるいはＬ／Ｔが１００未満の金型を用
いて得た成形品では、湯シワの発生は少なく、たとえ発
生したとしても射出成形の成形条件を調整する事により
容易に改善する事ができ、その解決は本発明によるまで
もない。The molded product of the present invention has a gate diameter of 0. hm or less or L/T is 1
This is a molded product obtained by injection molding using a 00 or higher injection mold. That is, the gate diameter is 0.8 mm.
Molded products obtained using molds with L/T greater than 100, or molds with L/T less than 100, rarely produce hot water wrinkles, and even if they do occur, they can be easily improved by adjusting the injection molding conditions. This can be solved by the present invention.
ゲート径が０．８＠ｓ以下となるが、Ｌ／Ｔが１００以
上になると成形品に湯シワが発生しゃすくなり、又成形
条件の調整による改善は困難になってくる、特にゲート
径が０．５＠ｓ以下またばＬ／Ｔが２００以上では湯シ
ワの発生が激しく成形条件では改善できなくなる。この
様な湯シワを発生し易い金型を用いねばならないとき、
本発明の効果は非常に明瞭である。The gate diameter is 0.8@s or less, but if the L/T is 100 or more, hot water wrinkles will easily occur in the molded product, and it will be difficult to improve by adjusting the molding conditions, especially if the gate diameter is If L/T is less than 0.5@s or more than 200, hot water wrinkles will occur severely and cannot be improved by changing the molding conditions. When it is necessary to use a mold that is prone to wrinkles,
The effects of the present invention are very clear.
本発明に使用する樹脂組成を構成するスチレン系樹脂は
スチレンモノマーを単独で重合したＧＰＰＳ、ゴム状エ
ラストマーの存在下にスチレンをグラフト重合したＨＩ
ＰＳ、アクリルニトリルとスチレンを共重合したＡＳ樹
脂２．ゴム状エラストマーの存在下にアクリルニトリル
とスチレンをグラフト重合したＡＢＳ樹脂等である。特
にＧＰＰＳの場合に本発明の効果は顕著である。The styrenic resin constituting the resin composition used in the present invention is GPPS, which is obtained by polymerizing styrene monomer alone, and HI, which is obtained by graft polymerizing styrene in the presence of a rubbery elastomer.
PS, AS resin copolymerized with acrylonitrile and styrene2. It is an ABS resin etc. in which acrylonitrile and styrene are graft-polymerized in the presence of a rubbery elastomer. The effects of the present invention are particularly remarkable in the case of GPPS.
本発明に使用する樹脂組成物を構成するステアリン酸ア
ミドは本発明に必須であって、他のアミド例えばパルミ
チン酸アミド、ベヘニル酸アミド等では本発明の効果は
現れない、そのスチレン系樹脂１００重量部に対する使
用量は０．１〜１．０重量部である事が必要である。０
．１重量部未満では湯シワの改良効果がなく１．０重量
部を越えると成形品の耐熱性が低下するので好ましくな
い。Stearic acid amide constituting the resin composition used in the present invention is essential to the present invention, and other amides such as palmitic acid amide, behenylic acid amide, etc. do not exhibit the effects of the present invention. The amount used should be 0.1 to 1.0 parts by weight. 0
．． If it is less than 1 part by weight, there is no effect of improving hot water wrinkles, and if it exceeds 1.0 part by weight, the heat resistance of the molded product will decrease, which is not preferable.
本発明に使用する樹脂組成物は通常の方法によって製造
する事ができる。即ち通常の押出機を用いてＧＰＰＳと
ステアリン酸アミドを溶融混練してペレット化する事に
よって製造できる。その際に通常使用される各種添加剤
、例えば離型剤、酸化防止剤、着色剤、帯電防止剤等を
添加する事ができる。特に離型剤即ちステアリン酸等の
脂肪酸、ステアリルアルコール等の脂肪族アルコール、
ステアリン酸亜鉛等を添加する事はカジリ、クラック等
のない成形品を得るために望ましい事である。The resin composition used in the present invention can be produced by a conventional method. That is, it can be produced by melt-kneading GPPS and stearic acid amide and pelletizing them using a conventional extruder. At that time, various commonly used additives such as a mold release agent, an antioxidant, a coloring agent, an antistatic agent, etc. can be added. In particular, mold release agents, such as fatty acids such as stearic acid, fatty alcohols such as stearyl alcohol,
Adding zinc stearate or the like is desirable in order to obtain molded products free of galling, cracking, etc.
本発明の成形品は上記樹脂組成物を用いて、本発明の金
型を用いて通常の射出成形機を用いて射出成形する事に
よって容易に得る事ができる。The molded article of the present invention can be easily obtained by injection molding the above-mentioned resin composition using a mold of the present invention using a conventional injection molding machine.
ｃ本発明の効果〕
本発明の成形品は湯シワを発生しておらず商品価値が極
めて高いものである。c. Effects of the present invention] The molded product of the present invention does not generate hot water wrinkles and has extremely high commercial value.
以下に実施例によって更に本発明を説明する。 The present invention will be further explained below with reference to Examples.
実施例Ｉ
ＧＰＰＳ （三井東圧化学■製トーボレックス５５０−
５１） １００重量部とステアリン酸アミド（花王株式
会社製脂肪酸アマイドＳ）０．５重量部を一軸押出機を
用い溶融混練しペレット化した。このペレットを用いゲ
ート径０．４ｈａのオーディオ・カセットの金型（成形
品寸法：肉厚 １．５−園、縦６３−１横１００ｍｍ）
を用いて、射出成形機にて成形温度２００℃で成形して
成形品を得た。ゲート近くに発生する湯シワを目視によ
り判定した。湯シワが全く発生しない状態を５とし、湯
シワの発生が著しい状態を１として５段階表示で評価し
た。結果を表１に示す。Example I GPPS (Tobolex 550- manufactured by Mitsui Toatsu Chemical Co., Ltd.)
51) 100 parts by weight and 0.5 parts by weight of stearic acid amide (Fatty Acid Amide S manufactured by Kao Corporation) were melt-kneaded using a single screw extruder and pelletized. This pellet is used to mold an audio cassette with a gate diameter of 0.4 ha (molded product dimensions: wall thickness 1.5mm, height 63mm, width 100mm)
A molded product was obtained by molding using an injection molding machine at a molding temperature of 200°C. Hot water wrinkles near the gate were visually determined. Evaluation was made on a five-point scale, with a score of 5 indicating no water wrinkles and 1 indicating a significant amount of water wrinkles. The results are shown in Table 1.
比較例１〜３
実施例１においてステアリン酸アミドの量を表１に示す
様に変更した組成物をつくり、実施例１と同じ金型にて
比較例１〜３を成形した。結果を表１に示す、比較例１
．２は湯シワの発生が多く、比較例３は耐熱性が低い。Comparative Examples 1 to 3 Comparative Examples 1 to 3 were prepared by changing the amount of stearamide in Example 1 as shown in Table 1, and molded in the same mold as Example 1. Comparative Example 1, the results are shown in Table 1
．． Sample No. 2 has many hot water wrinkles, and Comparative Example 3 has low heat resistance.
比較例４．５
実施例１においてステアリン酸アミドに変えて、ベヘニ
ン酸アミド、パルミチン酸アミドを用いて比較例４．５
の成形品を得た。比較例４．５ともに湯シワの発生が多
い。Comparative Example 4.5 Comparative Example 4.5 was carried out using behenic acid amide and palmitic acid amide instead of stearic acid amide in Example 1.
A molded product was obtained. In both Comparative Examples 4 and 5, there were many hot water wrinkles.
参考例１
実施例１において金型のゲートをｌｏｙｇｍにする以外
は実施例１と同様にして成形品を得た。参考例１は湯シ
ワが良好である。Reference Example 1 A molded product was obtained in the same manner as in Example 1 except that the gate of the mold was changed to LOYGM. Reference Example 1 has good hot water wrinkles.
実施例２
Ａｓ樹脂（三井東圧化学■製ライタツク１２０ＰＣ）１
００重量部とステアリン酸アミド０．８重量部とを用い
実施例１と同様にペレット化した。Example 2 As resin (Lightac 120PC manufactured by Mitsui Toatsu Chemical Co., Ltd.) 1
Pelletization was carried out in the same manner as in Example 1 using 0.00 parts by weight and 0.8 parts by weight of stearic acid amide.
このペレットを用い、ゲート径５−１肉厚２．５１１１
１１、ゲートからの最大流動長３００ｍ＋ｍである冷蔵
庫用トレー金型を用い、射出成形し冷蔵庫用トレーを成
形した。Using this pellet, gate diameter 5-1 wall thickness 2.5111
11. A refrigerator tray was molded by injection molding using a refrigerator tray mold with a maximum flow length of 300 m+m from the gate.
流動末端付近の湯シワを観察し、実施例１と同様の基準
で目視判定した。湯シワの判定結果は５で良好であった
。Wrinkles in the vicinity of the flow end were observed and visually determined using the same criteria as in Example 1. The evaluation result for hot water wrinkles was 5, which was good.
実施例３
実施例２においてＡｓ樹脂の代りにＡＢＳ樹脂（三井東
圧化学株式会社製サンタック５Ｔ−５０）を用い、他は
実施例２と同様にして実施例３の成形物を得た。湯シワ
の判定結果は４で良好であった。Example 3 A molded product of Example 3 was obtained in the same manner as in Example 2 except that ABS resin (Santac 5T-50 manufactured by Mitsui Toatsu Chemical Co., Ltd.) was used instead of the As resin in Example 2. The evaluation result for hot water wrinkles was 4, which was good.
Claims (1)
が１００以上の射出成形用金型を用いて熱可塑性樹脂を
射出成形する事によって得られる成形品であって、使用
する熱可塑性樹脂がスチレン系樹脂１００重量部とステ
アリン酸アミド０．１〜１．０重量部とからなる樹脂組
成物である事を特徴とする成形品。A molded product obtained by injection molding a thermoplastic resin using an injection mold with a gate diameter of 0.8 mm or less or a ratio of maximum flow length to average wall thickness of 100 or more, the thermoplastic resin used is a resin composition comprising 100 parts by weight of a styrene resin and 0.1 to 1.0 parts by weight of stearamide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20313788A JP2540606B2 (en) | 1988-08-17 | 1988-08-17 | Molded products with few hot water wrinkles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20313788A JP2540606B2 (en) | 1988-08-17 | 1988-08-17 | Molded products with few hot water wrinkles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0252712A true JPH0252712A (en) | 1990-02-22 |
| JP2540606B2 JP2540606B2 (en) | 1996-10-09 |
Family
ID=16469027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20313788A Expired - Lifetime JP2540606B2 (en) | 1988-08-17 | 1988-08-17 | Molded products with few hot water wrinkles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2540606B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004113180A1 (en) * | 2003-06-19 | 2004-12-29 | Dai Nippon Printing Co., Ltd. | In-mold label system plastic container |
| US9168771B2 (en) | 2012-11-29 | 2015-10-27 | Brother Kogyo Kabushiki Kaisha | Printer |
-
1988
- 1988-08-17 JP JP20313788A patent/JP2540606B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004113180A1 (en) * | 2003-06-19 | 2004-12-29 | Dai Nippon Printing Co., Ltd. | In-mold label system plastic container |
| JPWO2004113180A1 (en) * | 2003-06-19 | 2006-07-27 | 大日本印刷株式会社 | In-mold label type plastic container |
| US7588157B2 (en) | 2003-06-19 | 2009-09-15 | Dai Nippon Printing Co., Ltd. | In-mold label system plastic container |
| JP4527056B2 (en) * | 2003-06-19 | 2010-08-18 | 大日本印刷株式会社 | In-mold label type plastic container |
| US9168771B2 (en) | 2012-11-29 | 2015-10-27 | Brother Kogyo Kabushiki Kaisha | Printer |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2540606B2 (en) | 1996-10-09 |
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