Polycarbonate-based resin composition and molded article thereof

Patent metadata

Field	Value
Publication number	US-10717845-B2
Application number	US-201615556877-A
Country	US
Kind code	B2
Filing date	Mar 11, 2016
Priority date	Mar 12, 2015
Publication date	Jul 21, 2020
Grant date	Jul 21, 2020

Abstract

Provided is a polycarbonate-based resin composition containing a polycarbonate-based resin containing a predetermined polycarbonate-polyorganosiloxane copolymer, and 0.5 to 5 parts by mass of a white pigment with respect to 100 parts by mass of the polycarbonate-based resin, in which the molecular weight distribution of a polyorganosiloxane block in the polycarbonate-polyorganosiloxane copolymer is controlled within a specific region.

First claim

The invention claimed is:

1. A polycarbonate-based resin composition, comprising a polycarbonate-based resin containing a polycarbonate-polyorganosiloxane copolymer (E-1), and 0.5 to 5 parts by mass of a white pigment with respect to 100 parts by mass of the polycarbonate-based resin, wherein:
the polycarbonate-polyorganosiloxane copolymer (E-1) has a polycarbonate block (A) formed of a repeating unit represented by the following general formula (I) and a polyorganosiloxane block (B) containing a repeating unit represented by the following general formula (II);
wherein the polycarbonate-polyorganosiloxane copolymer (E-1) is prepared from a polyoragnosiloxane mixture obtained by blending a plurality of polyorganosiloxanes, and
in a differential molecular weight distribution curve obtained from measurement of the polyorganosiloxane block (B) by gel permeation chromatography (GPC) using a polystyrene calibration curve, the curve having an axis of abscissa indicating a logarithmic value log(M) of a molecular weight M and an axis of ordinate indicating dw/d log(M) obtained by differentiating a concentration fraction w with respect to the logarithmic value log(M) of the molecular weight,
(1) a dw/d log(M) value becomes maximum in a range of 3.4≤log(M)≤4.0, and
(2) a ratio of a value obtained by integrating the dw/d log(M) value over a range of 4.00≤log(M)≤4.50 to a value obtained by integrating the dw/d log(M) value over an entire range of the log(M) in the differential molecular weight distribution curve is 6 to 40%:

wherein R 1 and R 2 each independently represent a halogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms, X represents a single bond, an alkylene group having 1 to 8 carbon atoms, an alkylidene group having 2 to 8 carbon atoms, a cycloalkylene group having 5 to 15 carbon atoms, a cycloalkylidene group having 5 to 15 carbon atoms, a fluorenediyl group, an arylalkylene group having 7 to 15 carbon atoms, an arylalkylidene group having 7 to 15 carbon atoms, —S—, —SO—, —SO 2 —, —O—, or —CO—, R 3 and R 4 each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms, and a and b each independently represent an integer of 0 to 4,
wherein the GPC has been measured with the following parameters:
(i) solvent is THF,
(ii) a column temperature of 40° C.,
(iii) a flow rate of 1.0 ml/min,
(iv) an RI Detector,
(v) an injection concentration of 0.2 w/v %,
(vi) an injection amount of 0.1 ml, and
(vii) the GPC comprises a first column and a second column, each having a length of 30 cm respectively, with a different pore size, the first column's packing material pore size is 20 nm and the second column's packing material pore size is 2 nm, and each of which has a packing material has the following conditions: particle matrix is polystyrene divinylbenzene (PS-DVB), particle size is 5 μm, and
wherein the measurement of the polyorganosiloxane block (B) by GPC is conducted on a sample obtained under the following conditions:
a portion of the polycarbonate-polyorganosiloxane copolymer (E-1) is dissolved in methylene chloride to dissolve the copolymer and form a solution;
sodium hydroxide in methanol (obtained by mixing 48 mass % aqueous NaOH and methanol at a volume ratio of 1:9) is added to the copolymer solution to form a mixture;
ion-exchanged water is added to the mixture and a resulting organic layer is isolated;
a spectrum of the resulting organic layer is measured by GPC to obtain a GPC spectrum,
wherein in the GPC spectrum a molecular weight in terms of polystyrene is represented by M, and the molecular weight distribution of the polyorganosiloxane is identified by identifying a spectrum of the polyorganosiloxane in the GPC spectrum.

2. A polycarbonate-based resin composition, comprising a polycarbonate-based resin containing a polycarbonate-polyorganosiloxane copolymer (E-1), and 0.5 to 5 parts by mass of a white pigment with respect to 100 parts by mass of the polycarbonate-based resin, wherein:
the polycarbonate-polyorganosiloxane copolymer (E-1) has a polycarbonate block (A) formed of a repeating unit represented by the following general formula (I) and a polyorganosiloxane block (B) containing a repeating unit represented by the following general formula (II); and
the polycarbonate-based resin composition uses, as a raw material, a polyorganosiloxane (obtained by blending a plurality of polyorganosiloxanes) having the following features: in a differential molecular weight distribution curve obtained from measurement by gel permeation chromatography (GPC) using a polystyrene calibration curve, the curve having an axis of abscissa indicating a logarithmic value log(M) of a molecular weight M and an axis of ordinate indicating dw/d log(M) obtained by differentiating a concentration fraction w with respect to the logarithmic value log(M) of the molecular weight,
(1) a dw/d log(M) value becomes maximum in a range of 3.4≤log(M)≤4.0, and
(2) a ratio of a value obtained by integrating the dw/d log(M) value over a range of 4.00≤log(M)≤4.50 to a value obtained by integrating the dw/d log(M) value over an entire range of the log(M) in the differential molecular weight distribution curve is 6 to 40%:

wherein R 1 and R 2 each independently represent a halogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkoxy group having 1 to 6 carbon atoms, X represents a single bond, an alkylene group having 1 to 8 carbon atoms, an alkylidene group having 2 to 8 carbon atoms, a cycloalkylene group having 5 to 15 carbon atoms, a cycloalkylidene group having 5 to 15 carbon atoms, a fluorenediyl group, an arylalkylene group having 7 to 15 carbon atoms, an arylalkylidene group having 7 to 15 carbon atoms, —S—, —SO—, —SO 2 —, —O—, or —CO—, R 3 and R 4 each independently represent a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or an aryl group having 6 to 12 carbon atoms, and a and b each independently represent an integer of 0 to 4,
wherein the GPC has been measured with the following parameters:
(i) solvent is THF,
(ii) a column temperature of 40° C.,
(iii) a flow rate of 1.0 ml/min,
(iv) an RI Detector,
(v) an injection concentration of 0.2 w/v %,
(vi) an injection amount of 0.1 ml, and
(vii) the GPC comprises a first column and a second column, each having a length of 30 cm respectively, with a different pore size, the first column's packing material pore size is 20 nm and the second column's packing material pore size is 2 nm, and each of which has a packing material has the following conditions: particle matrix is polystyrene divinylbenzene (PS-DVB), particle size is 5 μm.

3. The polycarbonate-based resin composition according to claim 1 , wherein the polyorganosiloxane block (B) has an average chain length of 40 to 85.

4. The polycarbonate-based resin composition according to claim 1 , wherein a content of the polyorganosiloxane block (B) in the polycarbonate-polyorganosiloxane copolymer (E-1) is 0.5 to 20.0 mass %.

5. The polycarbonate-based resin composition according to claim 1 , wherein the polycarbonate-polyorganosiloxane copolymer (E-1) has a viscosity-average molecular weight of 12,000 to 40,000, as calculated from Schnell's equation: [η]=1.23×10 −5 ×Mv 0.83 by using a limiting viscosity [η] determined through the measurement of viscosity of a methylene chloride solution at 20° C. with an Ubbelohde-type viscometer.

Assignees

• Idemitsu Kosan Co

Inventors

• Ishikawa Yasuhiro
• Yamada Aki
• Aoki Yusuke

Classifications

• C08K9/04

  Ingredients treated with organic substances {(treated with macromolecular compounds C08K9/08)} · CPC title

• C08K3/013

  Fillers, pigments or reinforcing additives · CPC title

• C08K9/06

  with silicon-containing compounds · CPC title

• C08K2003/2241

  Titanium dioxide · CPC title

• C08K3/30

  Sulfur-, selenium- or tellurium-containing compounds · CPC title