Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1983-01-24
1985-02-12
Seccuro, Carman J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525901, C08L 2312, C08L 5302
Patent
active
044992386
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a resin composition used in the manufacture of thermoplastic resin products having pearl-like luster, as well as thermoplastic resin moldings obtained by molding this resin composition and having pearl-like luster, and the manufacturing method therefor. More particularly, the present invention relates to thermoplastic resin products having beautiful pearl-like patterns and luster and excellent mechanical strength such as impact strength and hinging properties.
BACKGROUND ART
In recent years, resin products are used in extremely wide-ranging fields, and requirements for these resin products have also been diversified. As one of such requirements, light electrical appliance parts, various containers for foodstuffs and cosmetics, and many other plastic household utensils and the like are required to be provided with beautiful luster and patterns on their surfaces to enhance their product value without impairing the numerous characteristics inherent in resin products.
To meet this requirement, several thermoplastic resin compositions have hitherto been proposed which provide resin products the surface texture of which per se has pearl-like luster. For example, Japanese Patent Publication No. 31467/1971 discloses a resin composition consisting essentially of acrylic resin, saturated aliphatic olefin resin and styrene resin; Japanese Patent Publication No. 41905/1976 discloses a resin composition containing styrene resin, styrene-acrylic resin and styrene-butadiene block copolymer resin; and Japanese Patent Publication Nos. 161837/1980 and 5542/1980 (although the latter does not refer to pearl-like luster) discloses a resin composition containing styrene resin and olefin resin.
However, these resin products having pearl-like luster are still insufficient in kind and number, and cannot adequately meet the needs of the market. Also, even if beautiful pearl-like luster could be obtained, there have been such problems as deterioration in the properties of the resin products, including such mechanical strength as impact strength and hinging properties, as well as decrease in moldability. In addition, more than three kinds of resin must be compounded at a predetermined ratio, which results in higher production costs.
Hence, pearl-like pigments are in some cases used as a means of obtaining resin products having pearl-like luster, but the use of such pigments is not economical because of an increase in the number of molding processes, and it also has a defect that the pearl-like luster of the surface is susceptible to discoloration.
It is, therefore, an object of the present invention to provide a novel resin composition used in the manufacture of thermoplastic resin products having pearl-like luster.
It is another object of the present invention to provide novel thermoplastic resin moldings having pearl-like luster.
It is a still another object of the present invention to provide a method of manufacturing novel thermoplastic resin moldings having pearl-like luster.
It is a further object of the present invention to provide resin products having beautiful pearl-like patterns and luster and excellent mechanical strength such as impact strength and hinging properties by molding a thermoplastic resin composition containing a styrene-butadiene block copolymer having a specific block form and crystalline polypropylene.
DISCLOSURE OF INVENTION
To this end, the present invention offers a novel resin composition used in the manufacture of thermoplastic resin products having a pearl-like luster, resin moldings manufactured from this resin composition and having pearl-like luster, and a method of manufacturing the resin moldings. More specifically, the resin composition consists essentially of: 25 to 95 wt% of a styrene-butadiene block copolymer having a butadient content of 10 to 35 wt% and having one kind or more than two kinds of block forms selected from a group of block forms expressed by general formulas such as (S-B)n, S-(B-S)n, B-(S-B)n, S-B-(S-B)n, (S-B)xY and {(S-
REFERENCES:
patent: 4086298 (1978-04-01), Fahrbach
patent: 4101498 (1978-07-01), Snyder
patent: 4180530 (1979-12-01), Bi et al.
patent: 4258145 (1981-03-01), Wright
patent: 4343918 (1982-08-01), Bohm et al.
Fujino Shinji
Fukushima Kiyoshi
Hao Hideyuki
Iwata Nobutoshi
Mitsuno Tatsuyuki
Nippon Steel Chemical Co. Ltd.
Seccuro Carman J.
Sumitomo Chemical Company Limited
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