JPH01261444A - Polystyrene resin composition of excellent gloss and impact resistance - Google Patents
Polystyrene resin composition of excellent gloss and impact resistanceInfo
- Publication number
- JPH01261444A JPH01261444A JP63087305A JP8730588A JPH01261444A JP H01261444 A JPH01261444 A JP H01261444A JP 63087305 A JP63087305 A JP 63087305A JP 8730588 A JP8730588 A JP 8730588A JP H01261444 A JPH01261444 A JP H01261444A
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- particles
- gloss
- modified polystyrene
- 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
- 239000011342 resin composition Substances 0.000 title claims abstract description 17
- 229920005990 polystyrene resin Polymers 0.000 title claims abstract description 11
- 239000002245 particle Substances 0.000 claims abstract description 76
- 239000004793 Polystyrene Substances 0.000 claims abstract description 31
- 229920002223 polystyrene Polymers 0.000 claims abstract description 31
- 229920001971 elastomer Polymers 0.000 claims abstract description 27
- 239000005060 rubber Substances 0.000 claims abstract description 25
- 229920000642 polymer Polymers 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims description 14
- 241001237745 Salamis Species 0.000 claims description 4
- 235000015175 salami Nutrition 0.000 claims description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 abstract description 11
- 239000005062 Polybutadiene Substances 0.000 abstract description 9
- 229920002857 polybutadiene Polymers 0.000 abstract description 9
- 238000006116 polymerization reaction Methods 0.000 abstract description 4
- 125000003118 aryl group Chemical group 0.000 abstract description 3
- 238000002156 mixing Methods 0.000 abstract description 3
- 239000000178 monomer Substances 0.000 abstract description 3
- 239000000654 additive Substances 0.000 abstract description 2
- 238000012662 bulk polymerization Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 abstract description 2
- 238000013019 agitation Methods 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000001746 injection moulding Methods 0.000 abstract 1
- 229920005989 resin Polymers 0.000 description 9
- 239000011347 resin Substances 0.000 description 9
- 230000007423 decrease Effects 0.000 description 7
- 238000003756 stirring Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- -1 0-methylstyrene Chemical compound 0.000 description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 150000003440 styrenes Chemical class 0.000 description 2
- OEVVKKAVYQFQNV-UHFFFAOYSA-N 1-ethenyl-2,4-dimethylbenzene Chemical compound CC1=CC=C(C=C)C(C)=C1 OEVVKKAVYQFQNV-UHFFFAOYSA-N 0.000 description 1
- JZHGRUMIRATHIU-UHFFFAOYSA-N 1-ethenyl-3-methylbenzene Chemical compound CC1=CC=CC(C=C)=C1 JZHGRUMIRATHIU-UHFFFAOYSA-N 0.000 description 1
- DXIJHCSGLOHNES-UHFFFAOYSA-N 3,3-dimethylbut-1-enylbenzene Chemical compound CC(C)(C)C=CC1=CC=CC=C1 DXIJHCSGLOHNES-UHFFFAOYSA-N 0.000 description 1
- JLBJTVDPSNHSKJ-UHFFFAOYSA-N 4-Methylstyrene Chemical compound CC1=CC=C(C=C)C=C1 JLBJTVDPSNHSKJ-UHFFFAOYSA-N 0.000 description 1
- 239000005063 High cis polybutadiene Substances 0.000 description 1
- 239000005064 Low cis polybutadiene Substances 0.000 description 1
- 238000003917 TEM image Methods 0.000 description 1
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- MPMBRWOOISTHJV-UHFFFAOYSA-N but-1-enylbenzene Chemical compound CCC=CC1=CC=CC=C1 MPMBRWOOISTHJV-UHFFFAOYSA-N 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229920005669 high impact polystyrene Polymers 0.000 description 1
- 239000004797 high-impact polystyrene Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 description 1
- MMSLOZQEMPDGPI-UHFFFAOYSA-N p-Mentha-1,3,5,8-tetraene Chemical compound CC(=C)C1=CC=C(C)C=C1 MMSLOZQEMPDGPI-UHFFFAOYSA-N 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010558 suspension polymerization method Methods 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
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Graft Or Block Polymers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、優れた品質総合バランスを有する耐衝撃性ポ
リスチレン樹脂組成物に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a high-impact polystyrene resin composition having an excellent overall quality balance.
例えば、ゴム変性ポリスチレンは、家庭電機製品の部品
等に多く用いられているが、従来ＡＢＳ樹脂に比して、
成形品表面の光沢に劣り、衝撃強度も低く、着色した際
の風合が及ばないと云う欠点を有していた。最近、ＡＢ
Ｓ樹脂の特性に近づいたゴム変性ポリスチレンの出現の
要望がコストダウン、薄肉化志向により市場から強まっ
て来ている。For example, rubber-modified polystyrene is often used in parts of home appliances, but compared to conventional ABS resin,
The molded product had the disadvantages of poor surface gloss, low impact strength, and poor texture when colored. Recently, AB
The demand for rubber-modified polystyrene that approaches the properties of S resin is increasing in the market due to the desire for cost reduction and thinner walls.
本発明の樹脂組成物は、光沢、衝撃強度、剛性の優れた
品質総合バランスが射出成形品、押出シート、押出真空
成形等にて発現される。高価なＡＢＳ樹脂からの代替、
製品薄肉化が可能となり、コストダウンを図れる経済的
な樹脂としての価値は大である。The resin composition of the present invention exhibits an excellent overall quality balance of gloss, impact strength, and rigidity in injection molded products, extrusion sheets, extrusion vacuum molding, and the like. Alternative to expensive ABS resin,
It has great value as an economical resin that allows products to be made thinner and lower costs.
ゴム変性ポリスチレンは、従来から工業的に多く用いら
れているが、その分散ゴム粒子径は一般に１．０〜５．
０ミクロン程度であり、最近は成形品の光沢を向上させ
るためにゴム粒子径の小さいものが開発上市されて来て
いるが、１．０ミクロン以下の小さいゴム粒子径の場合
には衝撃強度の低下が著しく、好ましい樹脂は得られて
いない。又、衝撃強度と光沢のバランスを改良するため
に１．０ミクロン以下の小さなゴム粒子径を有するゴム
変性ポリスチレンと大きなゴム粒子径を有するゴム変性
ポリスレンとのブレンドからなる組成物が、特公昭４６
−４１４６７号公報、特公昭５９−１５１９号公報、米
国特許第４，１４６，５８９号ＦｙＪｍ書、米国特許第
４，２１４．０５６号明細書、米国特許第４．４９３，
９２２号明細書等の先行文献に述べられているが、使用
されている大粒子が２ミクロン以上と大きいために成形
品の外観が劣り、特に光沢勾配が大きい（成形品におい
てゲートからの遠い個所の光沢の低下が大きい）、金型
温度の低い条件で成形されると、光沢が十分でないなど
の問題点があった。Rubber-modified polystyrene has been widely used industrially, and its dispersed rubber particle size is generally 1.0 to 5.
0 microns, and recently, rubber particles with small particle diameters have been developed and put on the market to improve the gloss of molded products, but in the case of small rubber particle diameters of 1.0 microns or less, the impact strength The decrease was significant, and a desirable resin was not obtained. In addition, in order to improve the balance between impact strength and gloss, a composition consisting of a blend of rubber-modified polystyrene with a small rubber particle size of 1.0 microns or less and a rubber-modified polystyrene with a large rubber particle size was published in the Japanese Patent Publication No. 46.
-41467, Japanese Patent Publication No. 59-1519, U.S. Patent No. 4,146,589 FyJm, U.S. Patent No. 4,214.056, U.S. Patent No. 4.493,
Although it is stated in prior documents such as the specification of No. 922, the large particles used are as large as 2 microns or more, so the appearance of the molded product is poor, and the gloss gradient is particularly large (parts far from the gate in the molded product). There were problems such as a large decrease in gloss) and insufficient gloss when molded at low mold temperatures.
先に述べた優れた品質総合バランスを有するゴム変性ポ
リスチレンに対する市場の要望に合致するには、優れた
成形品外観（特に光沢値が高（光沢勾配の小さいこと）
、衝撃強度、剛性の品質バランスの良いゴム変性ポリス
チレン樹脂が必要となる。In order to meet the market demand for rubber-modified polystyrene with an excellent overall quality balance as mentioned above, it is necessary to have excellent molded product appearance (especially high gloss value (small gloss gradient)).
, a rubber-modified polystyrene resin with a good balance of impact strength and rigidity is required.
本発明の目的は、上記の優れた成形品外観、衝撃強度、
剛性の品質バランスの優れた安価な耐衝撃性ポリスチレ
ン樹脂を提供することである。The objects of the present invention are the above-mentioned excellent molded product appearance, impact strength,
The purpose of the present invention is to provide an inexpensive impact-resistant polystyrene resin with an excellent balance of rigidity and quality.
この目的は、特定のミクロ構造を有するゴム変性ポリス
チレンよりなる本発明の樹脂組成物によっ達成される。This objective is achieved by the resin composition of the invention, which consists of rubber-modified polystyrene with a specific microstructure.
ｍち、本発明は、耐衝撃性ポリスチレン樹脂組成物にお
いて、該組成物中のゴム変性ポリスチレン中にゴム状重
合体が粒子状に分散しており、その分散粒子は小粒子部
分と大粒子部分との二つの山からなる分布を示し、小粒
子部分の平均粒子径が０．１〜０．６ミクロンであり、
大粒子部分の平均粒子径が０．７〜２．０ ミクロンで
あることを特徴とする光沢と耐衝撃性に優れたポリスチ
レン樹脂組成物に関するものである。The present invention provides an impact-resistant polystyrene resin composition in which a rubber-like polymer is dispersed in the form of particles in rubber-modified polystyrene in the composition, and the dispersed particles are divided into a small particle portion and a large particle portion. It shows a distribution consisting of two peaks, and the average particle diameter of the small particle portion is 0.1 to 0.6 microns,
The present invention relates to a polystyrene resin composition with excellent gloss and impact resistance, characterized in that the average particle diameter of the large particle portion is 0.7 to 2.0 microns.
本発明のゴム変性ポリスチレンは、ゴム状重合体の存在
下に芳香族モノビニル単量体を重合せしめる塊状重合法
又は塊状懸濁重合法で製造することができる。本発明に
特定された特殊なミクロ構造を有するゴム変性ポリスチ
レンは、重合工程における攪拌の状態、ゴム粒子生成時
の混合状態などをコントロールすることにより製造する
ことができる。The rubber-modified polystyrene of the present invention can be produced by a bulk polymerization method or a bulk suspension polymerization method in which an aromatic monovinyl monomer is polymerized in the presence of a rubbery polymer. The rubber-modified polystyrene having the special microstructure specified in the present invention can be produced by controlling the stirring state during the polymerization process, the mixing state during rubber particle production, and the like.
芳香族モノビニル単量体としては、スチレン及び０−メ
チルスチレン、ｐ−メチルスチレン、ｍ−メチルスチレ
ン、２．４−ジメチルスチレン、エチルスチレン、ｐ−
ｔｅｒｔ−ブチルスチレン等の核アルキル置換スチレン
、α−メチルスチレン、α−メチル−ｐ−メチルスチレ
ン等のα−アルキル置換スチレンなどが用いられる。又
、ゴム状重合体としては、ポリブタジェン、スチレンー
ブダジェン共重合体等であり、ポリブタジェンとしては
シス含有量の高いハイシスポリブタジェン、シス含有量
の低いローシスポリブタジェン共に用いることができる
。Aromatic monovinyl monomers include styrene, 0-methylstyrene, p-methylstyrene, m-methylstyrene, 2,4-dimethylstyrene, ethylstyrene, p-
Nuclear alkyl-substituted styrenes such as tert-butylstyrene, α-methylstyrene, α-alkyl-substituted styrenes such as α-methyl-p-methylstyrene, and the like are used. Further, examples of the rubbery polymer include polybutadiene, styrene-butadiene copolymer, etc., and as the polybutadiene, both high-cis polybutadiene with a high cis content and low-cis polybutadiene with a low cis content can be used. .
本発明においてゴム粒子径の分布が二つ山からなる分布
を示すゴム変性ポリスチレンは、小粒子ゴムを含有する
ゴム変性ポリスチレンと大粒子ゴムを含有するゴム変性
ポリスチレンとを別々に造り、押出機などでブレンドす
ることにより製造することもできるし、小粒子ゴムと大
粒子ゴムとを重合反応器にて混合することにより製造す
ることもできる。In the present invention, the rubber-modified polystyrene exhibiting a two-peak distribution of rubber particle diameters is obtained by separately producing rubber-modified polystyrene containing small-particle rubber and rubber-modified polystyrene containing large-particle rubber, and using an extruder or the like. It can also be produced by blending small particle rubber and large particle rubber in a polymerization reactor.
小粒子部分の平均粒径は０．１〜０．６ミクロンである
ことが必要であり、好ましくは０．２〜０．５ ミクロ
ンである。この平均粒子径が０．１ミクロン未満では衝
撃強度が低下し、又、０．６ミクロンを超えると成形品
の外観、特に光沢勾配が大きくなり、又、光沢の低下が
見られ好ましくない。更に小粒子ゴムは、単一オクルー
ジョン構造（シェル／コア形とも言われる）を有しいる
場合が、光沢と耐衝撃強度のバランスが良好となり最も
好ましい。The average particle size of the small particle portion must be 0.1 to 0.6 microns, preferably 0.2 to 0.5 microns. If the average particle diameter is less than 0.1 micron, the impact strength decreases, and if it exceeds 0.6 micron, the appearance of the molded article, especially the gloss gradient becomes large, and the gloss is decreased, which is not preferable. Furthermore, it is most preferable for the small particle rubber to have a single occlusion structure (also referred to as a shell/core structure), since this provides a good balance between gloss and impact strength.
このような小粒子ゴムは、スチレンとブタジェンのブロ
ック共重合体の存在下で攪拌下にスチレンを重合するこ
とによっても製造することができる。Such small particle rubbers can also be produced by polymerizing styrene under stirring in the presence of a block copolymer of styrene and butadiene.
又、大粒子部分の平均粒径は０．７〜２．０ミクロンで
あることが必要であり、好ましくは１．０〜１．５ミク
ロンである。この平均粒子径が０．７ミクロン未満では
衝撃強度が低下し、又、２．０ミクロンを超えると成形
品の外観、特に光沢勾配が大きくなり、又、金型温度の
低い条件で成形されると、光沢が不十分となるなどの点
で好ましくない。又、ゴム粒子径分布は小粒子部分と大
粒子部分からなる二つの山からなる分布を有しているこ
とが成形品外観、衝撃強度、剛性の品質バランスの優れ
た樹脂を与えている。Further, the average particle diameter of the large particle portion must be 0.7 to 2.0 microns, preferably 1.0 to 1.5 microns. If the average particle size is less than 0.7 microns, the impact strength will decrease, and if it exceeds 2.0 microns, the appearance of the molded product, especially the gloss gradient will become large, and it will not be possible to mold the product under low mold temperature conditions. This is not preferable because the gloss becomes insufficient. Furthermore, the rubber particle size distribution has a two-peak distribution consisting of a small particle portion and a large particle portion, which provides a resin with an excellent quality balance of molded product appearance, impact strength, and rigidity.
ここで云う平均粒子径とは、ゴム変性ポリスチレンの超
薄切片法による透過型電子顕微鏡写真を撮影し、写真中
のゴム状重合体粒子１０００個の粒子径を測定し、次式
により算出したものである。The average particle diameter referred to here is calculated by taking a transmission electron micrograph of rubber-modified polystyrene using an ultra-thin section method, measuring the particle diameter of 1000 rubber-like polymer particles in the photograph, and using the following formula. It is.
（ここにｎｉ は粒子径Ｄｊのゴム状重合体粒子の（固
数である。）
又、本発明において、組成物中のゴムの総量の２（ｌｉ
〜９５重量％、好ましくは５０〜９０重量％、最も好ま
しくは６０〜８０重量％が小粒子部分であり、５〜８０
重量％、好ましくは１０〜５０重量％、最も好ましくは
２０〜４０重量％が大粒子部分である。小粒子部分が２
０重量％未満では成形品外観が低下し、９５重量％を超
えると衝撃強度が低下し好ましくない。(Here, ni is a solid number of rubber-like polymer particles with a particle diameter Dj.) In addition, in the present invention, 2 (li) of the total amount of rubber in the composition
~95% by weight, preferably 50-90%, most preferably 60-80% by weight are small particle fractions, and 5-80% by weight are small particle fractions.
% by weight, preferably 10-50% by weight, most preferably 20-40% by weight, is the large particle portion. The small particle part is 2
If it is less than 0% by weight, the appearance of the molded product deteriorates, and if it exceeds 95% by weight, the impact strength decreases, which is not preferable.
又、本発明に用いるゴム変性ポリスチレンは良好な成形
品外観を得るために、実質上２ミクロン以上の大きなゴ
ム粒子を含有していないことが好ましい。実質上含有し
ていないとは、２ミクロン以上のゴム粒子が組成物中の
ゴムの総量の２０重量％以下、好ましくは５重量％以下
であることを示す。組成物中に２ミクロン以上の大きな
ゴム粒子が２０重量％以上存在すると、光沢勾配が大き
くなり、又、低い金型温度で得た成形品の光沢が低下す
るなどして、好ましい成形品外観を得ることができない
。Further, in order to obtain a good appearance of the molded product, the rubber-modified polystyrene used in the present invention preferably does not substantially contain large rubber particles of 2 microns or more. "Substantially free" means that rubber particles of 2 microns or more account for 20% by weight or less, preferably 5% by weight or less of the total amount of rubber in the composition. If 20% by weight or more of large rubber particles of 2 microns or more are present in the composition, the gloss gradient becomes large and the gloss of molded products obtained at low mold temperatures decreases, resulting in unfavorable molded product appearance. can't get it.
本発明の耐衝撃性ポリスチレン樹脂組成物には、高級脂
肪酸の金属塩、例えば、ステアリン酸亜鉛、ステアリン
酸カルシウム等、高級脂肪酸のアミＦ類、例えば、エチ
レンビスステアロアミド等の滑剤を組合せて用いること
により、衝撃強度及び光沢の点で好ましい結果が得られ
る。用いる滑剤の量は０．０１〜１．０重量％、好まし
くは０．０１〜０．２重量％である。The impact-resistant polystyrene resin composition of the present invention uses a combination of metal salts of higher fatty acids, such as zinc stearate and calcium stearate, and lubricants such as higher fatty acid amines F, such as ethylene bisstearamide. This gives favorable results in terms of impact strength and gloss. The amount of lubricant used is 0.01 to 1.0% by weight, preferably 0.01 to 0.2% by weight.
又、本発明の耐衝撃性ポリスチレン樹脂組成物には、染
顔料、滑剤、充填剤、離型剤、可塑剤、帯電防止剤等の
添加剤を必要に応じて添加することができる。Furthermore, additives such as dyes and pigments, lubricants, fillers, mold release agents, plasticizers, and antistatic agents can be added to the impact-resistant polystyrene resin composition of the present invention, if necessary.
本発明の樹脂組成物は衝撃強度、光沢、剛性の物性面で
の品質総合バランスに優れる。このような特性を有する
ことから特に大型の射出成形品を得るだめの樹脂として
非常に好ましい。The resin composition of the present invention has an excellent overall quality balance in terms of physical properties such as impact strength, gloss, and rigidity. Because it has such properties, it is highly preferred as a resin for producing particularly large injection molded products.
本発明の樹脂組成物は、弱電機器、雑貨等の分野におい
て成形品として使用できる。特に鮮明な外観が要求され
る成形品において好ましい結果を得ることができる。The resin composition of the present invention can be used as a molded article in fields such as light electrical equipment and miscellaneous goods. Particularly favorable results can be obtained in molded products that require a clear appearance.
以下に実施例を示す。なお、実施例に示されたデーター
は次の方法に基づいて測定されたものである。Examples are shown below. Note that the data shown in Examples was measured based on the following method.
アイゾツト衝撃強度： ＡＳＴＭ Ｄ ２５６によった
。Izod impact strength: According to ASTM D 256.
曲げ強さ、曲げ弾性率： ＡＳＴＭ Ｏ，７９０によっ
た。Bending strength, bending modulus: According to ASTM O, 790.
光沢： ＡＳＴＭ Ｄ ６３８のダンベル試験片のゲー
ト部とエンドゲート部の光沢度を測定した。Glossiness: The glossiness of the gate and end gate portions of ASTM D 638 dumbbell test pieces was measured.
実施例１〜５及び比較例１．２
スチレン−ブタジェンブロック共重合体の存在下にスチ
レンモノマーを攪拌下で重合することによって得た平均
粒子径が０．２ミクロンで単一オクルージョン構造を有
し、樹脂中のポリブタジェン成分の含有量が９重量％で
あるゴム変性ポリスチレン（Ａ）と、ポリブタジェンの
存在下にスチレンモノマーを攪拌下で重合することによ
って得た平均粒子径が１．５ミクロンでサラミ構造を有
し、樹脂中のポリブタジェン成分の含有量が１２重量％
であるゴム変性ポリスチレン（Ｂ）とを第１表に示した
比率で混合し、押出機で溶融混練して樹脂組成物を得た
。該樹脂組成物の光沢、アイシフト衝撃強度、曲げ弾性
率を評価した。その結果を第１表に示す。Examples 1 to 5 and Comparative Example 1.2 Polymerization of styrene monomer under stirring in the presence of a styrene-butadiene block copolymer had an average particle diameter of 0.2 microns and had a single occlusion structure. Rubber-modified polystyrene (A) in which the content of the polybutadiene component in the resin is 9% by weight is polymerized with styrene monomer in the presence of polybutadiene with stirring, and the average particle diameter is 1.5 microns. It has a salami structure and the content of polybutadiene component in the resin is 12% by weight.
and rubber-modified polystyrene (B) were mixed in the ratio shown in Table 1, and melt-kneaded using an extruder to obtain a resin composition. The resin composition was evaluated for gloss, eye shift impact strength, and flexural modulus. The results are shown in Table 1.
小粒子径ゴム粒子を含有するゴム変性ポリスチレン（Ａ
）と大粒子径ゴム粒子を含有するゴム変性ポリスチレン
（Ｂ）とを適当な比率で配合することによって光沢、特
にエンドゲート部の光沢値が良好で著しく衝撃強度の高
い組成物が得られる。Rubber-modified polystyrene containing small-diameter rubber particles (A
) and rubber-modified polystyrene (B) containing large-diameter rubber particles in an appropriate ratio, a composition with good gloss, particularly in the end gate area, and extremely high impact strength can be obtained.
ゴム変性ポリスチレン（Ａ）単独の場合には衝撃強度の
優れた組成物は得られない。If rubber-modified polystyrene (A) is used alone, a composition with excellent impact strength cannot be obtained.
実施例６．７及び比較例３．４
ポリブタジェンの存在下にスチレンモノマーを攪拌下で
重合し、その際の攪拌力の強さをコントロールすること
によって得た平均粒子径が０．６ミクロン、０．９ミク
ロン、１．５ミクロン、２．７ミクロンでサラミ構造を
有し、樹脂中のポリブタジェン成分の含有量が１２重量
％である４種のゴム変性ポリスチレン（Ｂ）を得た。こ
こで得たゴム変性ポリスチレン（Ｂ）２５重量％と実施
例１〜５で用いたゴム変性ポリスチレン（Ａ）７５重量
％を、第２表に示す如く加え、実施例１と同様に樹脂組
成物を得て物性を評価した。その結果を第２表に示す。Example 6.7 and Comparative Example 3.4 Styrene monomer was polymerized with stirring in the presence of polybutadiene, and the average particle diameter obtained by controlling the strength of the stirring force at that time was 0.6 microns, 0. Four types of rubber-modified polystyrene (B) having a salami structure of .9 micron, 1.5 micron, and 2.7 micron and having a polybutadiene component content of 12% by weight in the resin were obtained. 25% by weight of the rubber-modified polystyrene (B) obtained here and 75% by weight of the rubber-modified polystyrene (A) used in Examples 1 to 5 were added as shown in Table 2, and a resin composition was prepared in the same manner as in Example 1. was obtained and the physical properties were evaluated. The results are shown in Table 2.
ゴム変性ポリスチレン（Ａ）と組合せるゴム変性ポリス
チレンの平均粒子径が２ミクロンを超えると光沢勾配が
大きくなり（エンドゲート部の光沢が低い）好ましくな
い結果を示している。又、平均粒子径が０．６ミクロン
と小さくなると衝撃強度が低下して好ましくない。When the average particle diameter of the rubber-modified polystyrene used in combination with the rubber-modified polystyrene (A) exceeds 2 microns, the gloss gradient becomes large (the gloss at the end gate portion is low), which is an unfavorable result. Moreover, if the average particle diameter is as small as 0.6 microns, the impact strength decreases, which is not preferable.
比較例５
実施例３におけるゴム変性ポリスチレン（Ａ）に代えて
平均粒子径が０．７ミクロンでサラミ構造を有し、樹脂
中のポリブタジェン成分の含有量が９重量％であるゴム
変性ポリスチレンを用いて同様の評価を行った。その結
果を第２表に示す。光沢勾配が太き（なり好ましくない
。Comparative Example 5 In place of the rubber-modified polystyrene (A) in Example 3, a rubber-modified polystyrene having an average particle diameter of 0.7 microns, a salami structure, and a polybutadiene component content of 9% by weight in the resin was used. A similar evaluation was conducted. The results are shown in Table 2. The gloss gradient is thick (which is not desirable).
Claims (5)
成物中のゴム変性ポリスチレン中にゴム状重合体が粒子
状に分散しており、その分散粒子は小粒子部分と大粒子
部分との二つの山からなる分布を示し、小粒子部分の平
均粒子径が０．１〜０．６ミクロンであり、大粒子部分
の平均粒子径が０．７〜２．０ミクロンであることを特
徴とする光沢と耐衝撃性に優れたポリスチレン樹脂組成
物。(1) In an impact-resistant polystyrene resin composition, a rubber-like polymer is dispersed in the form of particles in rubber-modified polystyrene in the composition, and the dispersed particles are divided into two parts: a small particle part and a large particle part. A gloss that exhibits a distribution consisting of mountains, and is characterized by an average particle size of small particle portions of 0.1 to 0.6 microns and an average particle size of large particle portions of 0.7 to 2.0 microns. and polystyrene resin composition with excellent impact resistance.
粒子ゴムがサラミ構造を有することを特徴とする特許請
求の範囲第１項記載の組成物。(2) The composition according to claim 1, wherein the small particle rubber has a single occlusion structure and the large particle rubber has a salami structure.
子部分であり、５〜８０重量％が大粒子部分である特許
請求の範囲第１項又は第２項記載の組成物。(3) The composition according to claim 1 or 2, wherein 20 to 95% by weight of the total amount of rubber in the composition is a small particle portion and 5 to 80% by weight is a large particle portion.
ンである特許請求の範囲第１項又は第２項記載の組成物
。(4) The composition according to claim 1 or 2, wherein the average particle diameter of the small particle portion is 0.2 to 0.5 microns.
ンである特許請求の範囲第１項又は第２項記載の組成物
。(5) The composition according to claim 1 or 2, wherein the average particle diameter of the large particle portion is 1.0 to 1.5 microns.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63087305A JPH01261444A (en) | 1988-04-11 | 1988-04-11 | Polystyrene resin composition of excellent gloss and impact resistance |
| CA000595991A CA1335524C (en) | 1988-04-11 | 1989-04-07 | Rubber-modified polystyrene resin composition |
| US07/335,373 US5039714A (en) | 1988-04-11 | 1989-04-10 | Rubber-modified polystyrene resin composition |
| EP89200897A EP0337569B2 (en) | 1988-04-11 | 1989-04-10 | Rubber-modified polystyrene resin composition |
| DE1989604796 DE68904796T2 (en) | 1988-04-11 | 1989-04-10 | Rubber modified polystyrene resin composition. |
| KR1019890004774A KR920001046B1 (en) | 1986-10-29 | 1989-04-11 | Rubber-modified polystyrene resin composition |
| TW078102842A TW197460B (en) | 1986-10-29 | 1989-04-17 | |
| SG113094A SG113094G (en) | 1988-04-11 | 1994-08-13 | Rubber-modified polystyrene resin composition |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63087305A JPH01261444A (en) | 1988-04-11 | 1988-04-11 | Polystyrene resin composition of excellent gloss and impact resistance |
| SG113094A SG113094G (en) | 1988-04-11 | 1994-08-13 | Rubber-modified polystyrene resin composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01261444A true JPH01261444A (en) | 1989-10-18 |
| JPH0525897B2 JPH0525897B2 (en) | 1993-04-14 |
Family
ID=26428594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63087305A Granted JPH01261444A (en) | 1986-10-29 | 1988-04-11 | Polystyrene resin composition of excellent gloss and impact resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01261444A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0238437A (en) * | 1988-07-28 | 1990-02-07 | Idemitsu Petrochem Co Ltd | High-gloss and high-impact styrene resin composition |
| JPH0238435A (en) * | 1988-07-28 | 1990-02-07 | Idemitsu Petrochem Co Ltd | Styrene resin composition |
| JPH03220256A (en) * | 1990-01-26 | 1991-09-27 | Idemitsu Petrochem Co Ltd | Styrenic resin composition |
| JPH03220252A (en) * | 1990-01-26 | 1991-09-27 | Idemitsu Petrochem Co Ltd | High-gloss impact-resistant styrenic resin composition |
| JPH03223358A (en) * | 1990-01-30 | 1991-10-02 | Idemitsu Petrochem Co Ltd | Injection molded article of styrenic resin |
| JPH03223359A (en) * | 1990-01-30 | 1991-10-02 | Idemitsu Petrochem Co Ltd | Rubber-modified styrenic resin composition |
| US5473014A (en) * | 1992-03-23 | 1995-12-05 | Mitsui Toatsu Chemicals, Incorporated | Rubber modified styrenic resin composition having high gloss and impact strength |
| WO2003033559A1 (en) * | 2001-10-19 | 2003-04-24 | Cheil Industries Inc. | Method of preparing rubber modified polystyrene resin composition with high gloss and impact resistance |
| KR100411088B1 (en) * | 2001-08-17 | 2003-12-18 | 제일모직주식회사 | Styrenic Resin Composition with Excellent Heat Resistance and Surface Gloss |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51139850A (en) * | 1975-05-15 | 1976-12-02 | Labofina Sa | High impact polystylene composition and process for production thereof |
| US4493922A (en) * | 1980-09-20 | 1985-01-15 | Basf Aktiengesellschaft | Impact-resistant thermoplastic molding material |
| JPH0463099A (en) * | 1990-06-29 | 1992-02-28 | Kyocera Corp | Piezoelectric sounding body with coil and manufacture thereof |
-
1988
- 1988-04-11 JP JP63087305A patent/JPH01261444A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51139850A (en) * | 1975-05-15 | 1976-12-02 | Labofina Sa | High impact polystylene composition and process for production thereof |
| US4493922A (en) * | 1980-09-20 | 1985-01-15 | Basf Aktiengesellschaft | Impact-resistant thermoplastic molding material |
| JPH0463099A (en) * | 1990-06-29 | 1992-02-28 | Kyocera Corp | Piezoelectric sounding body with coil and manufacture thereof |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0238437A (en) * | 1988-07-28 | 1990-02-07 | Idemitsu Petrochem Co Ltd | High-gloss and high-impact styrene resin composition |
| JPH0238435A (en) * | 1988-07-28 | 1990-02-07 | Idemitsu Petrochem Co Ltd | Styrene resin composition |
| JPH03220256A (en) * | 1990-01-26 | 1991-09-27 | Idemitsu Petrochem Co Ltd | Styrenic resin composition |
| JPH03220252A (en) * | 1990-01-26 | 1991-09-27 | Idemitsu Petrochem Co Ltd | High-gloss impact-resistant styrenic resin composition |
| JPH03223358A (en) * | 1990-01-30 | 1991-10-02 | Idemitsu Petrochem Co Ltd | Injection molded article of styrenic resin |
| JPH03223359A (en) * | 1990-01-30 | 1991-10-02 | Idemitsu Petrochem Co Ltd | Rubber-modified styrenic resin composition |
| US5473014A (en) * | 1992-03-23 | 1995-12-05 | Mitsui Toatsu Chemicals, Incorporated | Rubber modified styrenic resin composition having high gloss and impact strength |
| KR100411088B1 (en) * | 2001-08-17 | 2003-12-18 | 제일모직주식회사 | Styrenic Resin Composition with Excellent Heat Resistance and Surface Gloss |
| WO2003033559A1 (en) * | 2001-10-19 | 2003-04-24 | Cheil Industries Inc. | Method of preparing rubber modified polystyrene resin composition with high gloss and impact resistance |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0525897B2 (en) | 1993-04-14 |
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