Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1998-01-23
2000-08-22
Boykin, Terressa M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528198, C08G 6400
Patent
active
061074403
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of The Invention
The present invention relates to an aromatic polycarbonate composition. More particularly, the present invention is concerned with an aromatic polycarbonate composition which is substantially the same as that produced by a method comprising: (1) subjecting to a transesterification reaction in a polymerizer at least one polymerizable material selected from the group consisting of a molten monomer mixture of an aromatic dihydroxy compound and a diaryl carbonate, and a molten prepolymer obtained by a process comprising reacting an aromatic dihydroxy compound with a diaryl carbonate, wherein the polymerizable material is present in the form of a liquid mass in the polymerizer, and wherein the transesterification reaction of the liquid mass of polymerizable material is performed under reaction conditions such that a specific relationship is satisfied among an evaporation surface area (m.sup.2) of the liquid mass of polymerizable material which is defined as the area (m.sup.2) of an exposed surface of the liquid mass of polymerizable material, the volume V (m.sup.3) of the liquid mass of polymerizable material in the polymerizer, and the number average molecular weight Mn of the aromatic polycarbonate to be produced, thereby obtaining an aromatic polycarbonate (A) in molten form; (2) adding to the obtained aromatic polycarbonate (A) in molten form a thermoplastic resin (B) other than an aromatic polycarbonate; and (3) kneading said aromatic polycarbonate (A) and said thermoplastic resin (B) together. The aromatic polycarbonate composition of the present invention is advantageous not only in that it can be produced in high efficiency, but also in that it is a high quality aromatic polycarbonate composition which has excellent color and which is free from occurrence of disadvantageous phenomena during the molding thereof, such as occurrence of silver streaks and a lowering of the Izod impact strength.
2. Prior Art
Aromatic polycarbonates have been known as engineering plastics having excellent heat resistance, impact resistance and transparency, and have been widely used in various fields. Particularly, in recent years, in a wide variety of fields, such as domestic electric appliances and automobiles, use has been made of various shaped articles obtained by molding an aromatic polycarbonate alloy which is produced by kneading an aromatic polycarbonate together with a resin other than an aromatic polycarbonate so as to improve the moldability and/or solvent resistance of the aromatic polycarbonate.
Conventionally, with respect to a shaped polymer alloy article produced from an aromatic polycarbonate and a resin other than an aromatic polycarbonate, the production thereof is conducted by molding a polymer alloy obtained by kneading in an extruder an aromatic polycarbonate, which is obtained by an interfacial polycondensation process using phosgene, together with a resin other than an aromatic polycarbonate. However, such a conventional shaped polymer alloy article has disadvantages as follows. The above-mentioned interfacial polycondensation process has problems in that it is necessary to use phosgene, which is poisonous, and that a reaction apparatus is likely to be corroded with chlorine-containing compounds, such as hydrogen chloride and sodium chloride, which are by-produced, and methylene chloride which is used as a solvent in a large quantity. Further, in the interfacial polycondensation process, it is difficult to separate and remove impurities, such as sodium chloride, and residual methylene chloride. When an aromatic polycarbonate containing the above-mentioned impurities and/or the above-mentioned residual methylene chloride is used to obtain a shaped polymer alloy article, the obtained article disadvantageously has poor thermal stability. Further, conventionally, in the production of the aromatic polycarbonate alloy which is conducted by melt-kneading the aromatic polycarbonate with a resin other than an aromatic polycarbonate, the aromatic polycarbon
Hachiya Hiroshi
Komiya Kyosuke
Asahi Kasei Kabushiki Kaisha
Boykin Terressa M.
LandOfFree
Aromatic polycarbonate composition does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Aromatic polycarbonate composition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Aromatic polycarbonate composition will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-582328