Topic
Polycarbonate
About: Polycarbonate is a research topic. Over the lifetime, 14032 publications have been published within this topic receiving 141740 citations. The topic is also known as: PC & Polycarbonate, PC.
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Patent•
27 Mar 1997TL;DR: In this paper, a glass fiber-reinforced polycarbonate resin composition was proposed, and the halogen content in said resin composition being not more than 5% by weight based on the total weight of the resin composition.
Abstract: The present invention relates to a glass fiber-reinforced polycarbonate resin composition comprising: (A) 70 to 92% by weight of an aromatic polycarbonate resin; (B) 1 to 20% by weight of an aromatic polycarbonate oligomer; (C) 3 to 20% by weight of a glass fiber comprising a short glass fiber having a fiber length of not more than 140 μm and a long glass fiber having a fiber length of more than 140 μm; and (D) 05 to 15% by weight of a composite rubber-based graft copolymer, halogen content in said resin composition being not more than 05% by weight based on total weight of said resin composition
53 citations
TL;DR: In this article, the effects of operation variables such as reaction time, reaction temperature, ethylene glycol/polycarbonate (EG/PC) weight ratio, and the kinetics of glycolysis were studied.
Abstract: Depolymerization of polycarbonate waste by glycolysis using ethylene glycol without catalyst was explored in order to get the monomer bisphenol A (BPA). The depolymerized products were identified by GC/MS and FTIR spectroscopy. The effects of operation variables such as reaction time, reaction temperature, ethylene glycol/polycarbonate (EG/PC) weight ratio, and the kinetics of glycolysis were studied. A maximum yield of BPA of 95.6% was achieved at a reaction temperature of 220 °C for 85 min with an EG/PC weight ratio 4. It was found that the depolymerization reaction has two different activation energies, indicating that the reaction occurs in series. A new model was proposed to explain the depolymerization reaction which consists of a series of reactions: random scission from high molecular weight PC to its solid oligomer, dissolution from the solid oligomer to liquid oligomer, and homogeneous degradation from the liquid oligomer to its monomer, BPA. The activation energies were found to be 98.9 kJ/mol ...
53 citations
Patent•
28 Sep 1988TL;DR: In this article, a mixture of a dihydroxydiaryl compound comprising at least 85 mole % of a diaryl carbonate was used to prepare a prepolymer having a weight average molecular weight of from 2,000 to 20,000 and having terminal aryl carbonates groups in an amount of greater than 50 mole %.
Abstract: A crystallized aromatic polycarbonate having a weight average molecular weight of from 6,000 to 200,000 and having a terminal hydroxyl group content of not greater than 0.03% by weight based on the weight of the polycarbonate is effectively produced by first heating a mixture of a dihydroxydiaryl compound comprising at least 85 mole % of a dihydroxydiaryl alkane with a diaryl carbonate to prepare a prepolymer having a weight average molecular weight of from 2,000 to 20,000 and having terminal aryl carbonate groups in an amount of greater than 50 mole %, based on the total number of moles of all the terminal groups of the prepolymer, secondly crystallizing the prepolymer and finally subjecting the crystallized prepolymer to solid-state polymerization. The crystallized aromatic polycarbonate does not contain impurities, is colorless and has excellent properties such as resistance to heat and to boiling water. Therefore, the polycarbonate is advantageously used as engineering plastics.
52 citations
TL;DR: In this article, the thermolysis products in air of two new epoxide based halogen-free flame retardant thermosetting plastics and polycarbonate, a commonly used thermoplastic with some structural similarity to the thermosets, are reported.
52 citations
Patent•
25 Jan 2007
TL;DR: In this article, the authors proposed a thermoplastic resin composition having excellent rigidity and thermal stability and also having excellent heat conductivity, which comprises total 100 pts. of thermoplastics, 1-50 pts of graphite, and 0.03-3 pts of an acidic group-containing organic compound.
Abstract: PROBLEM TO BE SOLVED: To provide a thermoplastic resin composition having excellent rigidity and thermal stability and also having excellent heat conductivity. SOLUTION: The resin composition comprises total 100 pts.wt. of 47-98.97 pts.wt. of thermoplastic resin (component A), 1-50 pts.wt. of graphite (component B) having ≤50 μm particle diameter in the composition, and 0.03-3 pts.wt. of an acidic group-containing organic compound. Preferably, the thermoplastic resin (component A) contains ≥50% polycarbonate resin, and the thermoplastic resin composition further contains one or more kinds selected from the group consisting of a phosphorus-based stabilizer (component D), a flame retardant (component E) and a fluorine-containing drip inhibitor (component F) besides them. The acidic group-containing organic compound is preferably an olefin-based wax having a carboxy group and/or an acid anhydride group thereof. COPYRIGHT: (C)2007,JPO&INPIT
52 citations