Abstract:
Provided is a molded body including a polycarbonate-polyorganosiloxane copolymer which contains a polycarbonate block (A-1) formed of a repeating unit having a specific structure and a polyorganosiloxane block (A-2) containing a repeating unit having a specific structure, and in which the content of the polyorganosiloxane block (A-2) is from 20 mass % or more to 70 mass % or less, wherein the molded body has a durometer hardness of from 25 or more to 72 or less measured with a type D durometer in conformity with JIS K 6253-3:2012.
Abstract:
A polycarbonate-based resin composition, including: a polycarbonate-based resin satisfying requirements (1) and (2); and a styrene-based resin blended into the polycarbonate-based resin, wherein a ratio of the polycarbonate-based resin in 100 mass % of a total amount of the polycarbonate-based resin and the styrene-based resin is from 50 mass % or more to 99 mass % or less: (1) the polycarbonate-based resin contains a polycarbonate-polyorganosiloxane copolymer containing a polycarbonate block formed of a specific repeating unit and a polyorganosiloxane block containing a specific repeating unit, and an aromatic polycarbonate-based resin except the polycarbonate-polyorganosiloxane copolymer; and (2) the polycarbonate-based resin has a structure in which a domain containing the polyorganosiloxane block is present in a matrix containing the aromatic polycarbonate-based resin as a main component, and a domain containing at least one selected from a block derived from the aromatic polycarbonate-based resin and the polycarbonate block is present inside the domain.
Abstract:
Provided is a polycarbonate-polyorganosiloxane copolymer including polycarbonate blocks (A-1) each formed of a specific repeating unit and polyorganosiloxane blocks (A-2) each containing a specific repeating unit, wherein the polycarbonate-polyorganosiloxane copolymer satisfies the following expression (F1a): 15≤wM1 (F1a) wherein wM1 represents the average content of the polyorganosiloxane blocks (A-2) in polycarbonate-polyorganosiloxane copolymers each having a molecular weight determined by using a polycarbonate as a conversion reference of from 56,000 or more to 200,000 or less among polycarbonate-polyorganosiloxane copolymers obtained through the separation of the polycarbonate-polyorganosiloxane copolymer by gel permeation chromatography.
Abstract:
Provided is a polycarbonate-based resin composition, including: 50 mass % or more to 99 mass % or less of a polycarbonate-based resin (S) containing a polycarbonate-polyorganosiloxane copolymer (A) containing a polycarbonate block (A-1) formed of a specific repeating unit and a polyorganosiloxane block (A-2) containing a specific repeating unit, and an aromatic polycarbonate-based resin (B) except the polycarbonate-polyorganosiloxane copolymer (A); and 1 mass % or more to 50 mass % or less of a polyester-based resin (C), wherein the polyorganosiloxane block (A-2) has an average chain length of from 50 or more to 500 or less.
Abstract:
Provided is a method of producing a polycarbonate-polyorganosiloxane copolymer, including a step (Q) of causing a polycarbonate oligomer and at least one of polyorganosiloxanes represented by the following general formulae (i) to (iii) to react with each other in an organic solvent, in which in the step, a solid content weight x (g/L) of the polycarbonate oligomer in 1 L of a mixed solution of the organic solvent and the polycarbonate oligomer, a concentration y (mass %) of the polyorganosiloxane in the polycarbonate-polyorganosiloxane copolymer to be obtained, and a chain length n of the polyorganosiloxane satisfy specific conditions.
Abstract:
Provided is a polycarbonate-polyorganosiloxane copolymer including polycarbonate blocks (A-1) each formed of a specific repeating unit and polyorganosiloxane blocks (A-2) each containing a specific repeating unit, wherein the polycarbonate-polyorganosiloxane copolymer satisfies the following expression (F1a):
15≤wM1 (F1a)
wherein wM1 represents the average content of the polyorganosiloxane blocks (A-2) in polycarbonate-polyorganosiloxane copolymers each having a molecular weight determined by using a polycarbonate as a conversion reference of from 56,000 or more to 200,000 or less among polycarbonate-polyorganosiloxane copolymers obtained through the separation of the polycarbonate-polyorganosiloxane copolymer by gel permeation chromatography.
Abstract:
A flame-retardant polycarbonate-based resin composition, including: a polycarbonate-based resin satisfying requirements (1) and (2); and a flame retardant, wherein the flame retardant is in an amount of from 0.001 part by mass or more to 20 parts by mass or less with respect to 100 parts by mass of the polycarbonate-based resin: (1) the polycarbonate-based resin contains a polycarbonate-polyorganosiloxane copolymer containing a polycarbonate block formed of a specific repeating unit and a polyorganosiloxane block containing a specific repeating unit, and an aromatic polycarbonate-based resin except the polycarbonate-polyorganosiloxane copolymer; and (2) the polycarbonate-based resin has a structure in which a domain containing the polyorganosiloxane block is present in a matrix containing the aromatic polycarbonate-based resin as a main component, and a domain containing at least one selected from a block derived from the aromatic polycarbonate-based resin and the polycarbonate block is present inside the domain.
Abstract:
Provided are a polycarbonate-polyorganosiloxane copolymer having a carbon tetrachloride concentration of less than 4 ppm by mass, and the following production method for producing the polycarbonate-polyorganosiloxane copolymer. More specifically, provided is a method of continuously producing a polycarbonate-polyorganosiloxane copolymer, the method comprising the steps of: (A) continuously or intermittently taking a polymerization reaction liquid, which is obtained by polymerizing a dihydric phenol compound, a carbonate precursor, and a specific polyorganosiloxane in the presence of an alkaline compound aqueous solution and a water-insoluble organic solvent, out of a reactor; (B) separating the polymerization reaction liquid taken out in the step (A) into an aqueous phase and a water-insoluble organic solvent phase; (C) washing the water-insoluble organic solvent phase separated in the step (B), followed by separation thereof into an aqueous phase and a water-insoluble organic solvent phase; (D) concentrating the water-insoluble organic solvent phase separated in the step (C); and (E) recovering part or all of the water-insoluble organic solvent removed by evaporation in the step (D), followed by distillation purification thereof in a distillation column, the water-insoluble organic solvent obtained in the step (E) being reused as at least part of the water-insoluble organic solvent in the step (A) or as an extraction solvent for the aqueous phase separated in the step (B), or as both thereof, in the step (E), the distillation purification being performed while a concentration of the polycarbonate-polyorganosiloxane copolymer in a column bottom liquid of the distillation column is controlled to 6% by mass or less.
Abstract:
Provided is a method for economically and stably producing a high-quality polycarbonate-polyorganosiloxane copolymer excellent in, for example, transparency and impact resistance in a continuous manner. Specifically, provided is a method of continuously producing a polycarbonate-polyorganosiloxane copolymer, the method including a step (A) of continuously or intermittently taking a polymerization reaction liquid, which is obtained by polymerizing a dihydric phenol-based compound, a carbonate precursor, and a polyorganosiloxane in the presence of an alkaline compound aqueous solution and a water-insoluble organic solvent, out of a reactor, the step (A) including the following step (a-1) and the following step (a-2), the method using a dissolution tank for dissolving the dihydric phenol-based compound in the alkaline compound aqueous solution to prepare an alkaline compound aqueous solution of the dihydric phenol-based compound to be used in each of both the step (a-1) and the step (a-2), the step (a-2) including, before mixing a polycarbonate oligomer and the dihydric phenol-based compound, mixing the alkaline compound aqueous solution and the alkaline compound aqueous solution of the dihydric phenol-based compound prepared in the dissolution tank: step (a-1): a step of mixing the alkaline compound aqueous solution of the dihydric phenol-based compound prepared in the dissolution tank and the polycarbonate precursor, followed by a reaction of the mixture in the presence of the water-insoluble organic solvent to produce the polycarbonate oligomer; and step (a-2): a step of continuously or intermittently taking the polymerization reaction liquid, which is obtained by mixing the alkaline compound aqueous solution of the dihydric phenol-based compound prepared in the dissolution tank, the polycarbonate oligomer obtained in the step (a-1), and the polyorganosiloxane, and polymerizing the mixture in the presence of the water-insoluble organic solvent, out of the reactor.
Abstract:
The present invention provides a method for producing a polycarbonate-polyorganosiloxane copolymer economically and stably, in particular, the present invention is concerned with a method for continuous production of a polycarbonate-polyorganosiloxane copolymer including (A) a step of withdrawing a polymerization reaction solution obtained by polymerizing a dihydric phenol compound, a carbonate precursor, and a polyorganosiloxane in the presence of an alkaline compound aqueous solution and a water-insoluble organic solvent continuously or intermittently from a reactor; (B) a step of separating the polymerization reaction solution withdrawn in the step (A) into an aqueous phase and a water-insoluble organic solvent phase; and (C) a step of after washing the water-insoluble organic solvent phase separated in the step (B) with an acidic aqueous solution, separating the resultant into an aqueous phase and a water-insoluble organic solvent phase, wherein the aqueous phase separated in the step (C) is extracted with a water-insoluble organic solvent, the content of the polycarbonate-polyorganosiloxane copolymer in the obtained extract is controlled to not more than 2% by mass, and a part or the whole of the extract is reused for the step (A).