Polycarbonate resin composition, method for producing same and molded article of this resin composition

a polycarbonate resin and composition technology, applied in the field of polycarbonate resin composition and a method for producing it, and a molded article of the resin composition, can solve the problems of not being able being unable to meet the requirements of a wide range of applications, etc., to achieve excellent heat resistance, excellent surface hardness, and excellent heat resistance.

Inactive Publication Date: 2014-01-16
MITSUBISHI ENG PLASTICS CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]Under these circumstances, the object of the present invention is to provide a polycarbonate resin composition being particularly excellent in the surface hardness and having excellent heat resistance, moldability (fluidity), color, impact resistance and flame retardancy.Solution to Problem
[0014]More specifically, it was found that by mixing a resin having Tg in a specific range, physical properties, particularly the surface hardness of a polycarbonate resin composition are specifically improved. Further, it was found that a polycarbonate resin composition of the present invention having a flame retardant incorporated in the polycarbonate resin has favorable flame retardancy.
[0021]According to the present invention, it is possible to obtain a polycarbonate resin composition having a particularly excellent surface hardness, having favorable flame retardancy, and having excellent heat resistance, moldability (fluidity), color, impact resistance and the like. That is, by a polycarbonate resin composition comprising a polycarbonate resin (b) and a polycarbonate resin (a) having a specific glass transition point, effects of increasing the surface hardness and the like can be obtained, without impairing the physical properties of the polycarbonate resin (b). For example, in a case where a bisphenol A type polycarbonate resin is used as the polycarbonate resin (b), the surface hardness which is a disadvantage of the bisphenol A type polycarbonate resin can be improved while minimizing a decrease in the impact resistance, the transparency, the color and the like which are characteristics of the bisphenol A type polycarbonate resin.

Problems solved by technology

However, a conventional polycarbonate resin made of bisphenol A as a raw material has not necessarily been sufficiently excellent in the surface hardness.
However, by this method, even though a polycarbonate resin composition excellent in the surface hardness is obtained, it is necessary to sacrifice other physical properties.
However, this method has such a problem that the shape of the molded article is limited to a sheet shape or the like, and the application is limited.
Further, it has drawbacks of low productivity such that the number of steps increases so as to achieve a multilayered structure, a complicated treatment is required at the time of molding, and defective articles are molded at the time of hard coating.

Method used

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  • Polycarbonate resin composition, method for producing same and molded article of this resin composition
  • Polycarbonate resin composition, method for producing same and molded article of this resin composition
  • Polycarbonate resin composition, method for producing same and molded article of this resin composition

Examples

Experimental program
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Effect test

reference example 1

Preparation of PC(a1)

[0231]To 37.6 kg (about 147 mol) of 2,2-bis(4-hydroxy-3-methylphenyl)propane (hereinafter sometimes referred to as “BPC”) (manufactured by HONSHU CHEMICAL INDUSTRY CO., LTD.) and 32.2 kg (about 150 mol) of diphenyl carbonate (DPC), an aqueous solution of cesium carbonate was added so that cesium carbonate would be 2 μmol per 1 mol of BPC to prepare a mixture. Then, the mixture was charged into a first reactor having an internal volume of 200 L equipped with a stirring machine, a heat medium jacket, a vacuum pump and a reflux condenser.

[0232]Then, an operation of reducing the pressure in the first reactor to 1.33 kPa (10 Torr) and then recovering it to the atmospheric pressure by nitrogen was repeatedly carried out five times, and then the interior in the first reactor was replaced with nitrogen. After replacement with nitrogen, a heat medium at a temperature of 230° C. was passed through the heat medium jacket to gradually increase the internal temperature in th...

reference example 2

Preparation of PC(a2)

[0235]In the same manner as in Reference Example 1, an ester exchange reaction in the first reactor was carried out for 80 minutes. Then, the pressure in the system was recovered to 101.3 kPa by the absolute pressure with nitrogen, and then the pressure was elevated to 0.2 MPa by the gauge pressure, and by means of a transfer pipe preliminarily heated to at least 200° C., the oligomer in the first reactor was pumped to a second reactor. The second reactor had an internal volume of 200 L, was equipped with a stirring machine, a heat medium jacket, a vacuum pump and a reflux condenser, and had the internal pressure and the internal temperature controlled to the atmospheric pressure and 240° C.

[0236]Then, the oligomer pumped to the second reactor was stirred at 38 rpm, the internal temperature was raised by the heat medium jacket, and the pressure in the second reactor was reduced from 101.3 kPa to 13.3 kPa by the absolute pressure over a period of 40 minutes. Then...

reference examples 3 and 4

Preparation of PC(a3) and PC(a4)

[0238]A reaction was carried out in accordance with Reference Example 2 except that the preliminarily determined stirring power of the stirring machine of the second reactor at the time of completion was changed. Then, the pressure in the second reactor was recovered to 101.3 kPa by the absolute pressure with nitrogen, and then the pressure was elevated to 0.2 MPa by the gauge pressure, the polycarbonate resin was withdrawn from the bottom of the second reactor in the form of strands, which were pelletized by using a rotary cutter while cooling in a water tank.

[0239]That is, by changing the preliminarily determined stirring power of the stirring machine of the second reactor at the time of completion, a polycarbonate resin (PC(a3)) and a polycarbonate resin (PC(a4)) were respectively obtained. The viscosity average molecular weight, the glass transition temperature (Tg) and the pencil hardness are as shown in Table 1.

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Abstract

To provide a polycarbonate resin composition excellent in the surface hardness, the heat resistance, the moldability and the flame retardancy.A polycarbonate resin composition comprising at least a polycarbonate resin (a) and a polycarbonate resin (b) having structural units different from the polycarbonate resin (a), which satisfies the following requirements:(i) the pencil hardness of the polycarbonate resin (a) as specified by ISO 15184 is higher than the pencil hardness of the polycarbonate resin (b) as specified by ISO 15184;(ii) the glass transition point Tg(a) of the polycarbonate resin (a) and the glass transition point Tg(b) of the polycarbonate resin (b) satisfy the relation of the following (Formula 1):Tg(b)−45° C.<Tg(a)<Tg(b)−10° C.  (Formula 1)(iii) the pencil hardness of the polycarbonate resin composition as specified by ISO 15184 is higher by at least two ranks than the pencil hardness of the polycarbonate resin (b) as specified by ISO 15184.

Description

[0001]This application is a divisional of U.S. application Ser. No. 13 / 632,289 filed Oct. 1, 2012, which is a continuation of PCT / JP2011 / 058336 filed Mar. 31, 2011, both of which are incorporated herein by reference. This application also claims the benefit of JP 2010-083181 filed Mar. 31, 2010, JP 2010-262055 filed Nov. 25, 2010, JP 2010-262056 filed Nov. 25, 2010, JP 2011-018525 filed Jan. 31, 2011, JP 2011-018526 filed Jan. 31, 2011, JP 2011-047877 filed Mar. 4, 2011 and JP 2011-076450 filed Mar. 30, 2011.TECHNICAL FIELD[0002]The present invention relates to a polycarbonate resin composition and a method for producing it, and a molded article of the resin composition. More particularly, it relates to a polycarbonate resin composition comprising at least two types of polycarbonate resins differing in structural units, and a method for producing it.BACKGROUND ART[0003]A polycarbonate resin is excellent in the mechanical strength, the electrical properties, the transparency and the ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08L69/00B29C48/08
CPCC08L69/00C08L2205/02B29K2069/00C08K3/016B29C48/022B29C48/08C08L2666/18C08K3/32C08K5/02C08K5/42B32B5/145B32B27/365B29B7/46B29B9/06B29B9/12B29C45/0001B29K2105/0067B29K2105/0094B29K2995/002B29K2995/0046B29K2995/007B29K2995/0088B29K2995/0089B29L2007/002B29L2007/008
Inventor HITOMI, TATSUYANISHIHARA, RYOUHEIYAMAMOTO, MASANORINAKATA, MICHIONOBUYASU, TETSUROUUCHIMURA, RYUUJITAKAHASHI, KAZUYUKITSURUHARA, KENJIYOKOYAMA, TOMONARI
Owner MITSUBISHI ENG PLASTICS CORP
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