Polycarbonate resin composition

Patent metadata

Field	Value
Publication number	US-10513580-B2
Application number	US-201515512410-A
Country	US
Kind code	B2
Filing date	Oct 15, 2015
Priority date	Oct 17, 2014
Publication date	Dec 24, 2019
Grant date	Dec 24, 2019

Abstract

Provided is a polycarbonate resin composition, including, with respect to 100 parts by mass of an aromatic polycarbonate resin (A), 0.005 part by mass to 1 part by mass of a phosphorus-based compound (B) having an aryl group, and 0.005 part by mass to 5 parts by mass of a polyether compound (C) having a specific polyoxyalkylene structure, in which: an amount of a compound having a phenol structure produced by decomposition of the phosphorus-based compound (B) 1,500 hours after standing thereof under conditions of 40° C. and a humidity of 90% is 5 mass % or less with respect to the phosphorus-based compound (B); and when a weight of the phosphorus-based compound (B) is measured with a thermogravimetric-differential thermal analysis machine under a nitrogen atmosphere, a temperature at which the weight becomes smaller than the weight before the measurement by 2% is 340° C. or more.

First claim

The invention claimed is:

1. A polycarbonate resin composition, comprising, with respect to 100 parts by mass of an aromatic polycarbonate resin (A), 0.005 part by mass to 1 part by mass of a phosphorus-based compound (B) having an aryl group, and 0.005 part by mass to 5 parts by mass of a polyether compound (C) having a polyoxyalkylene structure,
wherein:
an amount of a compound having a phenol structure produced by decomposition of the phosphorus-based compound (B) 1,500 hours after standing thereof under conditions of 40° C. and a humidity of 90% is 5 mass % or less with respect to the phosphorus-based compound (B);
when a weight of the phosphorus-based compound (B) is measured with a thermogravimetric-differential thermal analysis (TG-DTA) machine under a nitrogen atmosphere, a temperature at which the weight becomes smaller than the weight before the measurement by 2% is 340° C. or more; and
the polyether compound (C) is represented by the following formula (1):
R C3 O—(R C1 O) m (R C2 O) n —R C4   (1)

wherein R C1 and R C2 each represent a methylene group, an ethylene group, a trimethylene group, a propylene group, or a hexamethylene group, and R C3 and R C4 each represent a hydrogen atom, a hydrocarbon group having 1 to 30 carbon atoms, an alkanoyl group having 1 to 30 carbon atoms, an alkenoyl group having 2 to 30 carbon atoms, or a glycidyl group, and R C3 and R C4 may be identical to or different from each other.

2. The polycarbonate resin composition according to claim 1 , wherein the aromatic polycarbonate resin (A) comprises a polycarbonate comprising, in a main chain thereof, a repeating unit represented by the following general formula (I):

wherein R A1 and R A2 each represent an alkyl group or alkoxy group having 1 to 6 carbon atoms, and R A1 and R A2 may be identical to or different from each other, 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, —S—, —SO—, —SO 2 —, —O—, or —CO—, and a and b each independently represent an integer of from 0 to 4, when a represents 2 or more, R A1 's may be identical to or different from each other, and when b represents 2 or more, R A2 's may be identical to or different from each other.

3. The polycarbonate resin composition according to claim 1 , wherein the phosphorus-based compound (B) having an aryl group comprises a phosphorus-based compound having a phosphite structure.

4. The polycarbonate resin composition according to claim 1 , wherein the phosphorus-based compound (B) having an aryl group comprises a pentaerythritol diphosphite compound represented by the following general formula (II):

wherein Y 1 to Y 4 each represent a hydrocarbon group having 6 to 15 carbon atoms, and may be identical to or different from each other.

5. The polycarbonate resin composition according to claim 4 , wherein Y 1 to Y 4 in the formula (II) each represent a cumyl group that may be unsubstituted or substituted, a phenyl group that may be unsubstituted or substituted, a naphthyl group that may be unsubstituted or substituted, or a biphenyl group that may be unsubstituted or substituted.

6. The polycarbonate resin composition according to claim 1 , wherein the phosphorus-based compound (B) having an aryl group comprises a pentaerythritol diphosphite compound represented by the following general formula (II-1):

wherein R B1 to R B8 each represent an alkyl group or an alkenyl group, and may be identical to or different from each other, and R B1 and R B2 , R B3 and R B4 , R B5 and R B6 , or R B7 and R B8 may be bonded to each other to form a ring, R B9 to R B12 each represent a hydrogen atom or an alkyl group, and may be identical to or different from each other, m 1 to m 4 each represent an integer of from 0 to 5, and may be identical to or different from each other, and Z 1 to Z 4 each represent a single bond or a carbon atom, and may be identical to or different from each other, and when Z 1 to Z 4 each represent a single bond, R B1 to R B8 are excluded from the general formula (II-1).

7. The polycarbonate resin composition according to claim 1 , wherein the phosphorus-based compound (B) having an aryl group comprises bis(2,4-dicumylphenyl)pentaerythritol diphosphite.

8. The polycarbonate resin composition according to claim 1 , wherein the polyether compound (C) comprises a polyoxyalkylene glycol in which in the formula (1), R C1 and R C2 each represent an ethylene group, or a propylene group, and R C3 and R C4 each represent a hydrogen atom.

9. The polycarbonate resin composition according to claim 1 , wherein the aromatic polycarbonate resin (A) has a viscosity-average molecular weight (Mv) of from 9,000 to 50,000.

10. The polycarbonate resin composition according to claim 1 , wherein an amount of o-hydroxyacetophenone measured by the following measurement method (2) is 2.0 ppm by mass or less, and an amount of o-hydroxyacetophenone measured by the following measurement method (1) is twice or less as large as the amount of o-hydroxyacetophenone measured by the measurement method (2):
measurement method (1)
the polycarbonate resin composition is pelletized, followed by drying, and is then molded into a molded body measuring 50 mm by 80 mm by 5 mm thick by an injection molding method at a cylinder temperature of 360° C. and a die temperature of 80° C. for a cycle time of 50 seconds, the molded body is pulverized and dissolved in chloroform, and an amount of o-hydroxyacetophenone in the solution is determined by high-performance liquid chromatography; and

measurement method (2)
the polycarbonate resin composition is pelletized, followed by drying, and is then molded into a molded body measuring 50 mm by 80 mm by 5 mm thick by the injection molding method at a cylinder temperature of 280° C. and a die temperature of 80° C. for a cycle time of 50 seconds, the molded body is pulverized and dissolved in chloroform, and an amount of o-hydroxyacetophenone in the solution is determined by the high-performance liquid chromatography.

11. The polycarbonate resin composition according to claim 1 , wherein YI values measured by the following measurement methods (3) and (4) are 1.2 or less, and a difference between the YI values measured by the measurement method (3) and the measurement method (4) is 0.1 or less:
measurement method (3)
the polycarbonate resin composition is pelletized, followed by drying, and is then molded into a molded body measuring 50 mm by 80 mm by 5 mm thick by an injection molding method at a cylinder temperature of 360° C. and a die temperature of 80° C. for a cycle time of 50 seconds, and a YI value of the molded body is measured with a spectrophotometer under conditions of a C light source and a two-degree field of view; and

measurement method (4)
the polycarbonate resin composition is pelletized, followed by drying, and is then molded into a molded body measuring 50 mm by 80 mm by 5 mm thick by the injection molding method at a cylinder temperature of 280° C. and a die temperature of 80° C. for a cycle time of 50 seconds, and a YI value of the molded body is measured with the spectrophotometer under conditions of a C light source and a two-degree field of view.

12. A method

Assignees

• Idemitsu Kosan Co

Inventors

• Takimoto Masami
• Torii Takahiro
• Nakae Mitsugu

Classifications

• C08L69/00 Primary

  Compositions of polycarbonates; Compositions of derivatives of polycarbonates · CPC title

• G02B1/04

  made of organic materials, e.g. plastics (G02B1/08 takes precedence) · CPC title

• C08K5/526

  with hydroxyaryl compounds · CPC title

• C08L71/02

  Polyalkylene oxides · CPC title

• C08K5/523

  with hydroxyaryl compounds · CPC title