Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1997-10-09
2000-09-12
Mosley-Boykin, Terressa
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528196, C08G 6400
Patent
active
061179698
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a polycarbonate resin composition. More particularly, the present invention is concerned with a polycarbonate resin composition comprising a specific polycarbonate resin comprising a plurality of aromatic polycarbonate main chains, wherein the a romantic polycarbonate main chains collectively contain specific heterounits in a specific amount in the polycarbonate main chains, and a rubber-reinforced thermoplastic resin The polycarbonate resin composition of the present invention has high impact resistance and high moldability.
2. Prior Art
Polycarbonates have been widely used in various fields as engineering plastics having excellent heat resistance, impact resistance and transparency. Production of polycarbonates has conventionally been conducted by using the phosgene process. However, polycarbonates produced by using the phosgene process have problems in that the production thereof needs the use of phosgene, which is poisonous, and that they contain residual methylene chloride (solvent), which not only adversely affects the thermal stability of the polycarbonates, but also causes corrosion of a mold used for molding the polycarbonates. Therefore, recently, polycarbonates produced by using the transesterification process, which are free from the problems accompanying polycarbonates produced by the phosgene process, have been drawing attention.
With respect to transesterification polycarbonates, it is known: be obtained on a laboratory scale; however, when the production of transesterification polycarbonates is conducted on a commercial scale, only those having slightly yellowish color can be obtained [see "Purasuchikku Zairyo Koza (5), Porikaboneto Jushi (Lecture on Plastic Materials (5), Polycarbonate Resins)", page 66, published in 1981 by The Nikkan Kogyo Shimbun Ltd., Japan], and have many branched structures, so that they have poor strength (danger of brittle fracture is high), as compared to phosgene process polycarbonates [see "Kobunshi (Polymer)", vol. 27, p. 521, July 1978)].
In order to alleviate these problems of the transesterification polycarbonates, various studies have been made on the structure and production process of the transesterification polycarbonates. With respect to the branched structures of the transesterification polycarbonates, it is known that such branched structures are formed as follows. During the progress of the polymerization reaction in the presence of an alkali in the reaction system, the polycarbonate chain being formed suffers a side reaction represented by the reaction formula described below, which is similar to the Kolbe-Schmitt reaction: ##STR1## As is apparent from the above-shown structure formed in the main chain by the side reaction, a branched chain grows and extends through ester bonds. In some cases, such a branched chain forms a crosslinked structure in the final polycarbonate [see "Purasuchikku Zairyo Koza (5), Porikaboneto Jushi (Lecture on Plastic Materials (5), Polycarbonate Resins)", page 64, published in 1981 by The Nikkan Kogyo Shimbun Ltd., Japan; and "Porikaboneto Jushi Hando Bukku (Polycarbonate Resin Hand Book)", page 49, published in 1992 by The Nikkan Kogyo Shimbun Ltd., Japan].
With respect to the structure of the transesterification polycarbonate, it has been attempted to reduce the amount of branched structure in the polycarbonate. For example, Unexamined Japanese Patent Application Laid-Open Specification No. 5-105751 and Unexamined Japanese Patent Application Laid-Open Specification No. 5-202180 (corresponding to U.S. Pat. No. 5,468,836) disclose a technique to obtain a transesterification polycarbonate having no or almost no branched structure. Specifically, in these prior art documents, the transesterification reaction is conducted using a specific combination of catalysts, to thereby obtain a colorless polycarbonate having no or almost no branched structure which is formed by the side reaction during the polymerization. Unexamined Japanese Patent A
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Purasuchikku Aziryo Koza (5), Porikaboneto Jushi (Lecture on Plastic Materials (5), Polycarbonate Resins), p. 66, published in 1981 by the Nikkan Kogyo Shimbun Ltd., Japan.
Kobunshi (Polymer), vol. 27, p. 521, Jul. 1978.
Purasuchikku Zairyo Koza (5), Porikaboneto Jushi (Lecture on Plastic Materials (5), Polycarbonate Resins), p. 64, published in 1981 by the Nikkan Kogyo Shimbun Ltd., Japan.
Porikaboneto Jushi Hando Bukku (Polycarbonate Resin Hand Book), p. 49, published in 1992 by the Nikkan Kogyo Shimbun Ltd., Japan.
Hachiya Hiroshi
Nanba Nobutsugu
Asahi Kasei Kogyo Kabushiki Kaisha
Mosley-Boykin Terressa
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