JPH02252763A - Resin molding and production thereof - Google Patents
Resin molding and production thereofInfo
- Publication number
- JPH02252763A JPH02252763A JP7383789A JP7383789A JPH02252763A JP H02252763 A JPH02252763 A JP H02252763A JP 7383789 A JP7383789 A JP 7383789A JP 7383789 A JP7383789 A JP 7383789A JP H02252763 A JPH02252763 A JP H02252763A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- weight
- parts
- molecular weight
- inorganic filler
- 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.)
- Pending
Links
- 229920005989 resin Polymers 0.000 title claims abstract description 80
- 239000011347 resin Substances 0.000 title claims abstract description 80
- 238000004519 manufacturing process Methods 0.000 title claims 2
- 238000000465 moulding Methods 0.000 title abstract description 11
- 239000002131 composite material Substances 0.000 claims abstract description 16
- 238000001746 injection moulding Methods 0.000 claims abstract description 8
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 5
- 239000011256 inorganic filler Substances 0.000 claims description 22
- 229910003475 inorganic filler Inorganic materials 0.000 claims description 22
- 239000000654 additive Substances 0.000 claims description 16
- 230000000996 additive effect Effects 0.000 claims description 15
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract description 28
- 239000004793 Polystyrene Substances 0.000 abstract description 15
- 229920002223 polystyrene Polymers 0.000 abstract description 15
- 229910000019 calcium carbonate Inorganic materials 0.000 abstract description 14
- 235000010216 calcium carbonate Nutrition 0.000 abstract description 14
- -1 polypropylene Polymers 0.000 abstract description 6
- 238000000926 separation method Methods 0.000 abstract description 5
- 239000004743 Polypropylene Substances 0.000 abstract description 3
- 229920001155 polypropylene Polymers 0.000 abstract description 3
- 229920001893 acrylonitrile styrene Polymers 0.000 abstract description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052593 corundum Inorganic materials 0.000 abstract description 2
- SCUZVMOVTVSBLE-UHFFFAOYSA-N prop-2-enenitrile;styrene Chemical compound C=CC#N.C=CC1=CC=CC=C1 SCUZVMOVTVSBLE-UHFFFAOYSA-N 0.000 abstract description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract description 2
- 239000000945 filler Substances 0.000 abstract 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 abstract 2
- 238000013329 compounding Methods 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 239000004594 Masterbatch (MB) Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000003086 colorant Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- AYTAKQFHWFYBMA-UHFFFAOYSA-N chromium dioxide Chemical compound O=[Cr]=O AYTAKQFHWFYBMA-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、樹脂成形体、特に磁気テープ力セントケース
の成形性を改善したものに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a resin molded article, particularly a magnetic tape force case with improved moldability.
磁気テープカセットは、ビデオテープ、オーディオテー
プ等を収納し、そのままの状態で使用して記録、再生で
きるものであるが、そのケースは樹脂材料により成形さ
れる。A magnetic tape cassette stores video tapes, audio tapes, etc. and can be used as is for recording and playback, and its case is molded from a resin material.
このカセットケースの製造は、樹脂を高温下に熔融した
状態で噴出ノズルから成形用型に注入する、いわゆる射
出成形により行われる。This cassette case is manufactured by so-called injection molding, in which resin is melted at high temperature and injected into a mold through a jet nozzle.
このようにして製造されるカセットケースは、機械的強
度を必要とするのみならず、寸法精度と長期使用した場
合でも寸法が変化しない寸法安定性を必要とされる。The cassette case manufactured in this manner not only requires mechanical strength, but also dimensional accuracy and dimensional stability such that the dimensions do not change even after long-term use.
このような要求を満たす樹脂材料としてポリプロピレン
等の樹脂と粒径２〜３μ翔の炭酸カルシウム等の無機フ
ィラーからなる複合材料が用いられている。As a resin material that satisfies such requirements, a composite material consisting of a resin such as polypropylene and an inorganic filler such as calcium carbonate having a particle size of 2 to 3 μm is used.
しかしながら、上記複合材料を使用して射出成形しよう
とすると、この複合材料の溶融物を射出成形機の噴出ノ
ズルから噴出させるときに噴出物に剪断応力が生じ、発
熱も起こる。これらは、噴出ノズルからの噴出速度を高
め、短時間で成形しようとすると、−段と大きくなり、
これにより樹脂と無機フィラーが分離し易くなって、成
形体の表面に無機フィラーが析出する現象を生じる。こ
れが起こると、材質が不均一になって、機械的強度を大
きくできず、また、寸法精度、寸法安定性も害すること
になる。この現象を回避しようとすると成形速度を遅く
しなければならず、生産性を向上できないという課題が
あった。However, when injection molding is performed using the above-mentioned composite material, shear stress is generated in the ejected material when the molten material of the composite material is ejected from the injection nozzle of the injection molding machine, and heat generation also occurs. If you try to increase the jet speed from the jet nozzle and mold in a short time, these will become significantly larger.
This makes it easy for the resin and the inorganic filler to separate, resulting in a phenomenon in which the inorganic filler is deposited on the surface of the molded article. When this happens, the material becomes non-uniform, making it impossible to increase mechanical strength, and also impairing dimensional accuracy and dimensional stability. In order to avoid this phenomenon, the molding speed must be slowed down, resulting in the problem that productivity cannot be improved.
一方、最近金属磁性粉が磁気テープに使用されるように
なって短波長領域の記録が容易になったことから、磁気
テープカセットケースについてもその寸法精度、寸法安
定性が厳しく要求されるようになり、その改善が望まれ
ている。On the other hand, recently, metal magnetic powder has come to be used in magnetic tapes, making it easier to record in the short wavelength range, so dimensional accuracy and stability are now strictly required for magnetic tape cassette cases. Improvement is desired.
本発明の目的は、無機フィラーと樹脂の分離が生じない
樹脂成形体を提供することにある。An object of the present invention is to provide a resin molded article in which separation of the inorganic filler and the resin does not occur.
本発明は、上記課題を解決するために、分子量ｓｏ、
ｏｏｏ〜１．ＯＯＯ，０００の熱可塑性樹脂からなるベ
ース樹脂と、分子量１ 、０００〜５０，０００の樹脂
からなる添加樹脂と、無機フィラーを含有し、これらの
各成分の割合がベース樹脂１００重量部に対して添加樹
脂０．５〜１００ ｆｆｉ量部置部−ス樹脂と添加樹脂
の合計ｉｏｏ ｉｒｒ量部置部して無機フィラー５〜２
００重量部であることを特徴とする樹脂成形体を提供す
るものである。上記組成の複合材料を用いて射出成形す
ると短時間成形を行っても無機フィラーと樹脂の分離が
なく、均一な樹脂成形体が得られ好ましい。In order to solve the above problems, the present invention has a molecular weight so,
ooo~1. It contains a base resin made of a thermoplastic resin with a molecular weight of 1,000 to 50,000, and an inorganic filler, and the proportion of each of these components is based on 100 parts by weight of the base resin. Added resin 0.5 to 100 parts ffi amount - total of base resin and added resin ioo irr amount part parts inorganic filler 5 to 2 parts
00 parts by weight. Injection molding using a composite material having the above composition is preferable because there is no separation of the inorganic filler and resin even if the molding is performed for a short time, and a uniform resin molded product can be obtained.
次に本発明の詳細な説明する。Next, the present invention will be explained in detail.
本発明で使用される熱可塑性樹脂からなるベース樹脂と
しては、ポリスチレン、ポリプロピレンやポリエチレン
等のポリオレフィン、アクリル、ＡＳ（アクリルニトリ
ル−スチレン共重合体）、ＡＢＳ等のビニル系重合体の
ほか、ポリエステル、ポリアミド等も使用できる。その
分子量は、５０，０００〜１．０００．ＯＯＯであり、
この範囲より小さいと成形品の強度が維持できず、これ
より大きいと成形時の複合材料の流動性が悪くなり、好
ましくない。The base resin made of thermoplastic resin used in the present invention includes polyolefins such as polystyrene, polypropylene and polyethylene, vinyl polymers such as acrylic, AS (acrylonitrile-styrene copolymer), and ABS, as well as polyester, Polyamide etc. can also be used. Its molecular weight is 50,000-1.000. It is OOO,
If it is smaller than this range, the strength of the molded product cannot be maintained, and if it is larger than this, the fluidity of the composite material during molding will deteriorate, which is not preferable.
本発明で使用される添加樹脂は、上記ベース樹脂と同種
のものその化フェノール樹脂、エポキシ樹脂等も挙げら
れる。ベース樹脂と添加樹脂は同種のものを併用しても
良いが、異種のものを併用しても良い、添加樹脂の分子
量は１ 、０００〜ｓｏ、ｏｏ。Examples of the additive resin used in the present invention include those of the same type as the above-mentioned base resin, phenolic resins, epoxy resins, and the like. The base resin and the additive resin may be of the same type, or may be of different types.The molecular weight of the additive resin is 1,000 to so, oo.
が好ましく、この範囲より小さいと、成形時に加熱処理
を行う際に、この添加樹脂が分解してその添加の効果が
得られ難くなり、この範囲より大きいと、ベース樹脂や
無機フィラー等からなる複合材料の成形時の流動性を向
上できず、成形体表面に無機フィラーが析出し易くなる
。is preferable. If it is smaller than this range, the added resin will decompose during heat treatment during molding, making it difficult to obtain the effect of the addition. If it is larger than this range, the composite consisting of base resin, inorganic filler, etc. The fluidity of the material during molding cannot be improved, and inorganic fillers tend to precipitate on the surface of the molded product.
ベース樹脂と添加樹脂の使用割合は、前者１００重量部
に対して後者が０．５〜１００重量部が好ましい、添加
樹脂の量が０．５重量部より少ないと、無機フィラー等
との混合物からなる複合材料を溶融して成形するときの
流動性の向上効果が少なく、成形品の表面に無機フィラ
ーが分離する傾向になり、１００重量部より多いと、成
形品の強度が小さくなる。The ratio of the base resin and the additive resin used is preferably 0.5 to 100 parts by weight of the latter to 100 parts by weight of the former.If the amount of the additive resin is less than 0.5 parts by weight, the mixture with inorganic fillers etc. When the composite material is melted and molded, the effect of improving fluidity is small, and the inorganic filler tends to separate on the surface of the molded product, and if the amount exceeds 100 parts by weight, the strength of the molded product decreases.
本発明で使用される無機フィラーとしては、ＣａＣＯ３
、ＴｉＯ２，５ｉ０２、ＺｎＯ、Ｆｅ２Ｏ３、Ｃｒ２０
Ｂ 、Ａｌ２Ｏ３、ＣｒＯ２、Ｐ ｂ５ Ｄ４、ＣｕＯ
等が挙げられ、その平均粒径は００１〜１０μｍが好ま
しい。The inorganic filler used in the present invention includes CaCO3
, TiO2,5i02, ZnO, Fe2O3, Cr20
B, Al2O3, CrO2, P b5 D4, CuO
etc., and the average particle size is preferably 0.001 to 10 μm.
上記無機フィラーの樹脂に対する使用割合は、ベース樹
脂１００重量部に対して５〜２００重量部であり、これ
より少ないと成形品の寸法安定性が悪くなることがあり
、２００重量部より多いと樹脂量が少な過ぎることによ
り成形品の曲げ、引張り強度を低下させることがある。The proportion of the above-mentioned inorganic filler in the resin is 5 to 200 parts by weight based on 100 parts by weight of the base resin.If it is less than this, the dimensional stability of the molded product may deteriorate, and if it is more than 200 parts by weight, the resin If the amount is too small, the bending and tensile strength of the molded product may be reduced.
本発明の樹脂成形体を得るのに使用する複合材料には他
の成分、例えば着色剤、潤滑剤等も使用でき、着色剤と
樹脂を予め練り合わせたマスターバッチも使用できる。Other components, such as colorants and lubricants, can also be used in the composite material used to obtain the resin molded article of the present invention, and a masterbatch prepared by kneading the colorant and resin in advance can also be used.
本発明の樹脂成形体を製造するには、上記樹脂と無機フ
ィラー、さらに必要に応じて着色剤等の他の添加剤を添
加してから混合し、成形する。この成形法には例えば射
出成形法が挙げられる。In order to produce the resin molded article of the present invention, the above-mentioned resin and inorganic filler, and if necessary, other additives such as a coloring agent are added, and then mixed and molded. Examples of this molding method include injection molding.
本発明の樹脂成形体は、磁気テープカセントケースのほ
かに、磁気記録装置のガイドローラ、テープガイドビン
のような成形体、カメラ、時計の外枠、スピーカボック
ス等精密機器に用いられるケース等寸法精度、寸法安定
性、強度等を必要とするものにも用いられる。In addition to magnetic tape cartridge cases, the resin molded product of the present invention can be used in molded products such as guide rollers of magnetic recording devices, tape guide bins, and cases used in precision equipment such as cameras, outer frames of watches, and speaker boxes. It is also used for items that require dimensional accuracy, dimensional stability, strength, etc.
無機フィラーと樹脂からなる複合材料の樹脂に分子量５
０．０００〜１．０００．０００のベース樹脂と分子量
１ 、０００〜ｓｏ、 ｏｏｏの添加樹脂を併用したの
で、前者で成形品の強度を持ち、後者で成形時の複合材
料熔融物の流動性を向上でき、この流動性の改善により
成形品において無機フィラーの樹脂からの分離を抑制で
きる。The resin of the composite material consisting of inorganic filler and resin has a molecular weight of 5.
Since we used a base resin with a molecular weight of 0.000 to 1.000.000 and an additive resin with a molecular weight of 1,000 to so, ooo, the former provides the strength of the molded product, and the latter improves the fluidity of the composite melt during molding. This improvement in fluidity can suppress the separation of the inorganic filler from the resin in the molded product.
実施例 次に本発明の詳細な説明する。Example Next, the present invention will be explained in detail.
実施例１
ポリスチレン（分子量３００．０００） ８０ 重
量部ポリスチレン（分子量２０．０００） ２０
Ｍ置部炭酸カルシウム １００ ！
置部（ＣａＣＯ３平均粒径２μａ＋）
マスターバンチ ５Ｎ！量部（カー
ボンと樹脂が２０７８０で混合されたもの）を押出機に
よって２００℃に加熱溶融し、混練してペレットを作っ
た。このようにして得られたペレットを用いて射出成形
機にて射出時間３秒でオーディオカセットテープ用ハー
フを１００個成形した。Example 1 Polystyrene (molecular weight 300.000) 80 parts by weight Polystyrene (molecular weight 20.000) 20
M Okibe Calcium Carbonate 100!
Okibe (CaCO3 average particle size 2μa+) Master Bunch 5N! A certain amount (carbon and resin mixed at 20780) was heated and melted at 200° C. using an extruder, and kneaded to make pellets. Using the pellets thus obtained, 100 halves for audio cassette tapes were molded using an injection molding machine for an injection time of 3 seconds.
このようにして得られたハーフについて、外観検査及び
強度試験を行った。The thus obtained halves were subjected to visual inspection and strength tests.
外観検査は、目視によりハーフ全面をしらべ、不均一個
所が１つでも認められたときは外観不拘−品とした。ま
た、強度試験は、ハーフに長さ１３５−のメタルテープ
を組み込み、これを１−の高さかさコンクリート面に落
下させ、ひび割れ等の破損が目視により認められたとき
、破損とした。In the appearance inspection, the entire surface of the half was visually inspected, and if even one non-uniform part was observed, the product was judged as having no appearance. In the strength test, a metal tape with a length of 135 mm was installed in the half, and the tape was dropped onto a concrete surface at a height of 1 mm, and when damage such as cracks was visually observed, it was considered to be damaged.
上記で得られた１００個のハーフについての試験結果を
外観不拘−品個数、破損個数として表１に示す。The test results for the 100 halves obtained above are shown in Table 1 as the number of pieces regardless of appearance and the number of damaged pieces.
比較例１
ポリスチレン（分子量３００．０００） １００
ｆｆｉ量部炭酸カルシウム １０
０重量部（ＣａＣＯ５平均粒径２μ−）
マスターバンチ ５重量部（カーボ
ンと樹脂が２０ ： ８０で混合されたもの）を上記実
施例１と同様に処理してハーフを作製し、これについて
も実施例１と同様に試験した結果を表１に示す。Comparative Example 1 Polystyrene (molecular weight 300.000) 100
ffi parts calcium carbonate 10
0 parts by weight (CaCO5 average particle size 2 μ-) 5 parts by weight of master bunch (carbon and resin mixed at a ratio of 20:80) were treated in the same manner as in Example 1 above to prepare a half, and the same procedure was carried out for this. Table 1 shows the results of testing in the same manner as in Example 1.
表１の結果、比較例１では試験した１００個全部のハー
フが外観不拘−品であり、無機フィラーの局所的析出が
認められるが、実施例ではいずれの項目も良好であるこ
とがわかる。The results in Table 1 show that in Comparative Example 1, all 100 halves tested had an unreliable appearance and localized precipitation of inorganic filler was observed, but in Examples, all items were good.
実施例２
ポリスチレン（分子量３００．０００） ５０重
量部ポリスチレン（分子量２０，０００） ５０
重量部炭酸カルシウム １００重量
部（ＣａＣＯ５平均粒径２．ＩＪＩｌｌ）マスターバッ
チ ５重量部（カーボンと樹脂が２
０：８０で混合されたもの）を上記実施例１と同様に処
理してハーフを１００ （１１作製し、これらについて
も実施例１と同様に試験した結果を表１に示す。Example 2 Polystyrene (molecular weight 300,000) 50 parts by weight Polystyrene (molecular weight 20,000) 50
Part by weight Calcium carbonate 100 parts by weight (CaCO5 average particle size 2.IJIll) Masterbatch 5 parts by weight (carbon and resin
0:80 mixture) was treated in the same manner as in Example 1 above to produce 100 (11) halves, and these were also tested in the same manner as in Example 1. The results are shown in Table 1.
添加樹脂の添加量を５０重量部にしてもハーフには外観
不良品が生ぜず、強度も十分であった。Even when the amount of additive resin added was 50 parts by weight, no defects in appearance were produced in the half, and the strength was sufficient.
実施例３
ポリスチレン（分子量３００．０００） ９９．５
重Ｊｉ部ポリスチレン（分子量２０．０００）
０．５重量部炭酸カルシウム １０
０重量部（ＣａＣＯ３平均粒径２μｍ）
マスターバッチ ５Ｍ量部（カー
ボンと樹脂が２０ ：８０で混合されたもの）を上記実
施例１と同様に処理してハーフを１００個作製し、これ
らについても実施例１と同様に試験した結果を表１に示
す。Example 3 Polystyrene (molecular weight 300.000) 99.5
Heavy JI polystyrene (molecular weight 20.000)
0.5 parts by weight calcium carbonate 10
0 parts by weight (CaCO3 average particle size 2 μm) 5M parts of masterbatch (carbon and resin mixed at a ratio of 20:80) were treated in the same manner as in Example 1 above to produce 100 halves, and these were also Table 1 shows the results of testing in the same manner as in Example 1.
添加樹脂の添加量を０．５重量部にしてもハーフには外
観不良品が１個しか生ぜず、強度も十分であった。Even when the amount of additive resin added was 0.5 parts by weight, only one half product with poor appearance was produced and the strength was sufficient.
実施例４
ポリスチレン（分子量３００．０００） ８０重
量部ポリスチレン（分子量５０，０００） ２０
重量部炭酸カルシウム １００重量
部（ＣａＣＯ３平均粒径２μｍ）
マスターバッチ ５重量部（カー
ボンと樹脂が２０ ：８０で混合されたもの）を上記実
施例１と同様に処理してハーフを１００個作製し、これ
らについても実施例１と同様に試験した結果を表１に示
す。Example 4 Polystyrene (molecular weight 300,000) 80 parts by weight Polystyrene (molecular weight 50,000) 20
Part by weight 100 parts by weight of calcium carbonate (CaCO3 average particle size 2 μm) 5 parts by weight of masterbatch (carbon and resin mixed at a ratio of 20:80) were treated in the same manner as in Example 1 above to produce 100 halves. These were also tested in the same manner as in Example 1, and the results are shown in Table 1.
添加樹脂の分子量を５０，０００にしてもハーフには外
観不良品が生ぜず、強度も十分であった。Even when the molecular weight of the added resin was set to 50,000, no defects in appearance were produced in the half, and the strength was sufficient.
実施例５
ポリスチレン（分子量３００．０００） ８０重
量部ポリスチレン（分子量 １．０００） ２０
重量部炭酸カルシウム １００重量
部（ＣａＣＯ５平均粒径２μ■）
マスターバッチ ５！量部（カー
ボンと樹脂が２０：８０で混合されたもの）を上記実施
例１と同様に処理してハーフを１００個作製し、これら
についても実施例１と同様に試験した結果を表１に示す
。Example 5 Polystyrene (molecular weight 300.000) 80 parts by weight Polystyrene (molecular weight 1.000) 20
Part by weight Calcium carbonate 100 parts by weight (CaCO5 average particle size 2 μ■) Masterbatch 5! 100 halves were prepared by treating the same amount (carbon and resin mixed at a ratio of 20:80) as in Example 1 above, and these were also tested in the same manner as in Example 1. The results are shown in Table 1. show.
添加樹脂の分子量を１ 、０００にしてもハーフには外
観不良品が生ぜず、強度も十分であった。Even when the molecular weight of the added resin was set to 1,000, no defective appearance was produced in the half, and the strength was sufficient.
比較例２
ポリスチレン（分子量３００．０００） ３０
重量部ポリスチレン（分子量２０．０００） ？
Ｏｆｆｉ量部炭酸カルシウム １０
０重量部（ＣａＣＯ３平均粒径２μｍｍ）
マスターバンチ ５重量部（カー
ボンと樹脂が２０：８０で混合されたもの）を上記実施
例１と同様に処理してハーフを１００個作製し、これら
についても実施例１と同様に試験した結果を表１に示す
。Comparative Example 2 Polystyrene (molecular weight 300.000) 30
Part by weight polystyrene (molecular weight 20.000)?
Offi parts calcium carbonate 10
0 parts by weight (CaCO3 average particle size 2 μmm) 5 parts by weight of master bunch (carbon and resin mixed at a ratio of 20:80) were treated in the same manner as in Example 1 above to produce 100 halves. Table 1 shows the results of testing in the same manner as in Example 1.
添加樹脂の添加量を７０重量部にすると、ハーフに外観
不拘−品が生じたものはないが、破損個数が多く、強度
的に問題である。When the amount of additive resin added was 70 parts by weight, no defects were observed in the appearance of the halves, but the number of broken pieces was large, which caused problems in terms of strength.
（この頁以下余白）
（発明の効果）
本発明によれば、無機フィラーと樹脂の複合材料から成
形された樹脂成形体において、樹脂に高分子量の樹脂と
、低分子量の樹脂を併用し、前者に成形品の強度を持た
せ、後者に成形時の複合材料溶融物の流動性を向上させ
るようにしたので、上記複合材料の例えば射出成形品は
材質の不均一部分が生じないとともに、その強度も維持
できる。(Margins below this page) (Effects of the invention) According to the present invention, in a resin molded article formed from a composite material of an inorganic filler and a resin, a high molecular weight resin and a low molecular weight resin are used together, and the former The latter gives the strength of the molded product, and the latter improves the fluidity of the composite material melt during molding, so injection molded products of the above composite material, for example, do not have uneven parts and have a high strength. can also be maintained.
これにより、寸法精度、寸法安定性確保でき、最近のこ
れらに対する厳しい要求に対してもこたえることができ
るカセットケースを提供することができる。Thereby, it is possible to provide a cassette case that can ensure dimensional accuracy and dimensional stability and can meet the recent strict demands for these.
Claims (2)
塑性樹脂からなるベース樹脂と、分子量１，０００〜５
０，０００の樹脂からなる添加樹脂と、無機フィラーを
含有し、これらの各成分の割合がベース樹脂１００重量
部に対して添加樹脂０．５〜１００重量部、ベース樹脂
と添加樹脂の合計１００重量部に対して無機フィラー５
〜２００重量部であることを特徴とする樹脂成形体。(1) Base resin consisting of a thermoplastic resin with a molecular weight of 50,000 to 1,000,000 and a molecular weight of 1,000 to 5
It contains an additive resin consisting of 0,000% resin and an inorganic filler, and the ratio of each of these components is 0.5 to 100 parts by weight of the additive resin to 100 parts by weight of the base resin, and the total of the base resin and additive resin is 100 parts by weight. Inorganic filler 5 parts by weight
200 parts by weight of a resin molded article.
塑性樹脂からなるベース樹脂と、分子量１，０００〜５
０，０００の樹脂からなる添加樹脂と、無機フィラーを
含有し、これらの各成分の割合がベース樹脂１００重量
部に対して添加樹脂０．５〜１００重量部、ベース樹脂
と添加樹脂の合計１００重量部に対して無機フィラー５
〜２００重量部である複合材料を用い射出成形すること
を特徴とする樹脂成形体の製造方法。(2) Base resin consisting of a thermoplastic resin with a molecular weight of 50,000 to 1,000,000 and a molecular weight of 1,000 to 5
It contains an additive resin consisting of 0,000% resin and an inorganic filler, and the ratio of each of these components is 0.5 to 100 parts by weight of the additive resin to 100 parts by weight of the base resin, and the total of the base resin and additive resin is 100 parts by weight. Inorganic filler 5 parts by weight
A method for producing a resin molded article, comprising injection molding using a composite material of ~200 parts by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7383789A JPH02252763A (en) | 1989-03-28 | 1989-03-28 | Resin molding and production thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7383789A JPH02252763A (en) | 1989-03-28 | 1989-03-28 | Resin molding and production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02252763A true JPH02252763A (en) | 1990-10-11 |
Family
ID=13529652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7383789A Pending JPH02252763A (en) | 1989-03-28 | 1989-03-28 | Resin molding and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02252763A (en) |
-
1989
- 1989-03-28 JP JP7383789A patent/JPH02252763A/en active Pending
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