Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1998-04-21
2000-12-12
Lipman, Bernard
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
524267, 524269, 524462, C08F 800
Patent
active
061600520
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a rubber-modified aromatic vinyl resin composition which is excellent in a balance between impact strength and rigidity and has an excellent gloss, and a process for producing the same.
BACKGROUND ART
Conventional rubber-modified styrene resin compositions have a low impact resistance as compared with an ABS resin, and therefore in order to elevate the impact resistance, rubber-like polymer grains having a grain diameter (rubber grain diameter) usually controlled to 1 to 3 .mu.m are dispersed in a styrene resin phase. However, there has been a problem that the inferior appearance thereof makes it difficult to use them for uses requiring an excellent appearance. Accordingly, proposed are a method in which for the purpose of improving a balance between the impact resistance and the gloss, a rubber-modified styrene resin composition having a rubber grain diameter of 1 .mu.m or less is blended a with silicone oil to make up the impact resistance (Japanese Patent Publication No. Hei 3-76338, Japanese Patent Publication No. Hei 5-11143 and Japanese Patent Publication No. Hei 5-45624) and a method in which in addition to the above, a proportion of a gel component to a rubber component is controlled (Japanese Patent Publication No. Hei 7-53816). However, a balance between the impact resistance and the rigidity has not yet been good in these methods. Further, it is proposed in Japanese Patent Publication No. Hei 3-62723 and Japanese Patent Publication No. Hei 1-34453 to improve the coloring property and the appearance by controlling the average grain diameter of an aromatic vinyl polymer included in a rubber-like material. In addition to this, proposed, for example, in Japanese Patent Publication No. Hei 5-25897 and Japanese Patent Publication No. Hei 5-18348 is a method in which rubber grains having a single occlusion (core shell, capsule) structure are blended with rubber grains having a salami structure to form a two-peak rubber grain diameter distribution, whereby a balance between the impact resistance and the gloss is improved to bring the characteristics close to those of an ABS resin. Any of these methods, however, causes such a problem that while high values are shown in measuring the gloss, the gloss intensity (visibility of the reflected image) observed when the actual molded articles are evaluated by eyes is insufficient and the reflected image on the surface of the molded article has a haze, and further that the molded articles have a low surface hardness and are lacking in an abrasion resistance, whereby they are limited in uses.
Thus, the balance of the gloss with the impact resistance and the rigidity is insufficient, and the satisfying quality has not yet been obtained. Accordingly, materials having an excellent balance therebetween has been expected to be developed.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a rubber-modified aromatic vinyl resin composition which overcomes the defects described above and which provides an excellent gloss and high impact resistance and rigidity all together and has less unevenness in the gloss, and a process for producing the same.
Intensive researches continued by the present inventors have resulted in finding that the object described above can be achieved by blending a rubber-modified aromatic vinyl resin composition in which rubber grains having a specific grain diameter range and grain diameter distribution are dispersed with a silicone oil or a mixed oil of a silicone oil and a fluorine compound oil, and thus coming to complete the present invention.
That is, the present invention relates to a rubber-modified aromatic vinyl resin composition having an excellent balance among a gloss and physical properties such as impact resistance and rigidity, obtained by polymerizing an aromatic vinyl monomer in the presence of a raw material rubber-like polymer, wherein
(a) the rubber-like polymer is dispersed in the aromatic vinyl polymer in the form of grains, and the dispersed gr
REFERENCES:
patent: 5039714 (1991-08-01), Kasahara et al.
patent: 5294656 (1994-03-01), Okamoto et al.
Fujita Masanari
Nozawa Masayuki
Shichijo Yasuji
Lipman Bernard
Nippon Steel Chemical Co. Ltd.
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