JP2006037032A - Polycarbonate resin composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polycarbonate resin composition and a molded article composed of the same, more in detail to provide a polycarbonate resin composition and a molded article composed of the same having excellent flow properties while keeping excellent impact resistance, transparency, heat resistance, heat stability, etc., each characteristic to the polycarbonate resin. <P>SOLUTION: The invention relates to the polycarbonate resin composition comprising (A) 100 pts.wt. of the polycarbonate resin, (B) 0.01-0.6 pt.wt. of an organic acid and (C) 0.4-1.0 pt.wt. of an amide compound and the molded article composed of the same. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a highly fluid polycarbonate resin composition and a molded article comprising the same. More specifically, the present invention provides a polycarbonate resin composition having excellent fluidity while maintaining the impact resistance, transparency, heat resistance, thermal stability, etc., which are the characteristics of polycarbonate resin, and a molded product comprising the same. .

  Polycarbonate resin is a thermoplastic resin excellent in impact resistance, transparency, heat resistance, thermal stability and the like, and is widely used in fields such as electricity, electronics, ITE, machinery, and automobiles. However, in recent years, there has been a remarkable trend toward lighter and thinner products, and in order to satisfy design and design requirements, materials that have high fluidity (formability) in addition to the above-mentioned excellent performance are required. It has been.

In general, as a technique for improving the fluidity of a polycarbonate resin composition, a method of blending a low molecular weight compound, a polymer having high fluidity, or the like has been proposed.
JP 2000-103951 A JP 2000-319497 A JP 2001-226576 A

  However, when a low molecular weight compound or a polymer having high fluidity is blended, there is a problem that any of the characteristics such as impact resistance, transparency, heat resistance, and thermal stability of the polycarbonate resin is greatly impaired. The improvement has been strongly desired.

  As a result of intensive studies in view of such problems, the present inventors have found that various kinds of polycarbonate resins have a polycarbonate resin composition by blending a specific amount of a mixture of an organic acid and an amide compound as a high fluidizing agent. Thus, the present inventors have found a synergistic effect that the fluidity is remarkably improved as compared with the case of using an organic acid or an amide compound alone without impairing the excellent characteristics of the present invention.

  That is, the present invention comprises 0.01 to 0.6 parts by weight of an organic acid (B) and 0.4 to 1.0 parts by weight of an amide compound (C) with respect to 100 parts by weight of a polycarbonate resin (A). It is an object of the present invention to provide a polycarbonate resin composition characterized by the above, and a molded article formed therefrom.

  Since the polycarbonate resin composition of the present invention significantly improves fluidity without impairing impact resistance, transparency, heat resistance, thermal stability, etc., it is lightweight in various fields such as electricity, electronics, and ITE. It can be suitably used for products that require thinning and design, and has high industrial utility value.

  The polycarbonate resin (A) used in the present invention is obtained by a phosgene method in which various dihydroxydiaryl compounds and phosgene are reacted, or a transesterification method in which a dihydroxydiaryl compound and a carbonate such as diphenyl carbonate are reacted. A typical example of the polymer is a polycarbonate resin produced from 2,2-bis (4-hydroxyphenyl) propane (commonly referred to as bisphenol A).

  Examples of the dihydroxydiaryl compound include bisphenol 4-, bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxyphenyl) butane, 2, 2-bis (4-hydroxyphenyl) octane, bis (4-hydroxyphenyl) phenylmethane, 2,2-bis (4-hydroxyphenyl-3-methylphenyl) propane, 1,1-bis (4-hydroxy-3) -Tert-butylphenyl) propane, 2,2-bis (4-hydroxy-3-bromophenyl) propane, 2,2-bis (4-hydroxy-3,5-dibromophenyl) propane, 2,2-bis ( Bis (hydroxyaryl) alkanes such as 4-hydroxy-3,5-dichlorophenyl) propane, 1,1- (4-hydroxyphenyl) cyclopentane, bis (hydroxyaryl) cycloalkanes such as 1,1-bis (4-hydroxyphenyl) cyclohexane, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3 Dihydroxy diaryl ethers such as 3,3'-dimethyldiphenyl ether, dihydroxy diaryl sulfides such as 4,4'-dihydroxydiphenyl sulfide, 4,4'-dihydroxydiphenyl sulfoxide, 4,4'-dihydroxy-3,3 ' Dihydroxy diaryl sulfoxides such as dimethyldiphenyl sulfoxide, dihydroxy diary such as 4,4'-dihydroxydiphenyl sulfone, 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfone Sulfone, and the like.

  These may be used alone or in combination of two or more. In addition to these, piperazine, dipiperidyl hydroquinone, resorcin, 4,4′-dihydroxydiphenyl, and the like may be used in combination.

  Furthermore, the above dihydroxyaryl compound and a trivalent or higher phenol compound as shown below may be used in combination. Trihydric or higher phenols include phloroglucin, 4,6-dimethyl-2,4,6-tri- (4-hydroxyphenyl) -heptene, 2,4,6-dimethyl-2,4,6-tri- (4 -Hydroxyphenyl) -heptane, 1,3,5-tri- (4-hydroxyphenyl) -benzol, 1,1,1-tri- (4-hydroxyphenyl) -ethane and 2,2-bis- [4 4- (4,4'-dihydroxydiphenyl) -cyclohexyl] -propane and the like.

  Although there is no restriction | limiting in particular in the viscosity average molecular weight of polycarbonate resin (A), Usually, it is 10,000-100000, More preferably, it is 15000-30000, More preferably, it is 17000-26000 from the surface of moldability and intensity | strength. Moreover, when manufacturing this polycarbonate resin, a molecular weight modifier, a catalyst, etc. can be used as needed.

  Various types of organic acids (B) can be used. Examples thereof include fatty acids having 6 to 30 carbon atoms, and typical examples include caprylic acid, capric acid, lauric acid, palmitic acid, stearic acid, arachidic acid, maleic anhydride, and acid-modified siloxane. In particular, capric acid is preferably used.

  The compounding quantity of organic acid (B) is 0.01-0.6 weight part per 100 weight part of polycarbonate resin (A). If the blending amount is less than 0.01 parts by weight, the fluidity is inferior, and if it exceeds 0.6 parts by weight, the impact strength decreases, which is not preferable. A more preferable blending amount is in the range of 0.05 to 0.2 parts by weight.

The amide compound (C) is a compound represented by the following general formula (1).
General formula (1)
_{R1-CONH- (CH 2) n} -NHCO-R2
However, R1 and R2 are linear or branched alkyl groups having 6 to 30 carbon atoms, and n is an integer of 2 to 6. Specific examples include ethylene bisstearyl amide and ethylene bis oleyl amide, and ethylene bisstearyl amide is particularly preferably used.

  The compounding quantity of an amide compound (C) is 0.4-1.0 weight part per 100 weight part of polycarbonate resin (A). If the blending amount is less than 0.4 parts by weight, the fluidity is inferior. A more preferable blending amount is in the range of 0.5 to 0.8 parts by weight.

  There is no restriction | limiting in particular in the compounding method of polycarbonate resin (A), organic acid (B), and amide compound (C), For example, what prepared organic acid (B) and amide compound (C) previously prepared polycarbonate resin (A) The organic acid (B) and the amide compound (C) may be separately metered and blended with the polycarbonate resin (A).

  The method for mixing the polycarbonate resin (A), the organic acid (B) and the amide compound (C) is not particularly limited, and is mixed with an arbitrary mixer such as a tumbler, ribbon blender, high-speed mixer, etc. It can be easily melt-kneaded with a twin screw extruder or the like.

  When mixing, other known additives such as mold release agents, UV absorbers, fillers, impact modifiers, antistatic agents, antioxidants, thermal stabilizers, flame retardants, flame retardant aids, if necessary. Agents, dyes and pigments, spreading agents (epoxy soybean oil, liquid paraffin, etc.) can be blended.

  Examples of the filler include glass fiber, glass bead, glass flake, carbon fiber, talc, clay, mica, potassium titanate whisker, aluminum borate whisker, wollastonite, silica and the like.

  EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. “Parts” are based on weight unless otherwise specified.

The details of the used blending components are as follows.
Polycarbonate resin (hereinafter abbreviated as PC)
Caliber 200-20 (molecular weight: 18600) manufactured by Sumitomo Dow
Organic acid Capric acid NAA-102 manufactured by NOF Corporation
Amide compound Nippon Oil & Fats Co., Ltd. Ethylenebisstearylamide Alfro H-50TF

  Various raw materials are collectively put into a tumbler at the blending ratios shown in Tables 1 and 2, and after dry mixing for 10 minutes, they are kneaded at a melting temperature of 280 ° C. using a twin screw extruder (KTX37 manufactured by Kobe Steel). As a result, pellets of the polycarbonate resin composition were obtained. The following evaluation was performed from the obtained pellets.

(1) Archimedes spiral flow fluidity The flow length at a channel thickness of 1 mm was measured using an Archimedes spiral flow mold under the conditions of a melting temperature of 280 ° C. and an injection pressure of 1600 kg / cm ² . A flow length of 130 mm or more was regarded as acceptable.

(2) Izod Impact Test A test piece for Izod impact test was processed under a melting temperature of 280 ° C., and Izod impact strength was measured according to ASTM D256. The measurement temperature is 23 ° C., and the thickness of the test piece is 3.2 mm. An impact value of 30 kg / cm / cm or more was considered acceptable.

(3) Heat resistance (deflection temperature under load: HDT)
A test piece for a heat resistance test was processed under a melting temperature of 280 ° C., and a deflection temperature under load (HDT) was measured in accordance with ASTM D648. The fiber stress was set to 18.5 kg / cm ² , and the measurement test piece was not annealed. The thickness of the test piece is 6.4 mm. HDT passed 120 degreeC or more as the pass.

(4) Transparency Evaluation Under the conditions of a melting temperature of 280 ° C., a three-stage thickness color chip was prepared and visually judged.

(5) Evaluation of granulation property The granulation property was determined by observing the state of the strand during granulation with the naked eye to determine good / bad.

  As shown in Table 1, when the polycarbonate resin composition satisfied the configuration of the present invention (Examples 1 to 4), the standard was satisfied over all evaluation items.

As shown in Table 2, when the polycarbonate resin composition did not satisfy the constitution of the present invention, it had some drawbacks in any case.
Since Comparative Example 1 is a polycarbonate resin in which the amide compound (C) is not blended, the fluidity does not satisfy the standard.
In Comparative Example 2, the compounding amount of the amide compound (C) was more than the upper limit of the specified range, and the impact strength did not satisfy the standard.
In Comparative Example 3, since the polycarbonate resin does not contain the organic acid (B), the fluidity did not satisfy the standard.
In Comparative Example 4, the blending amount of the organic acid (B) was more than the upper limit of the specified range, and the impact strength did not satisfy the standard.

Claims (7)

  A polycarbonate comprising 0.01 to 0.6 parts by weight of an organic acid (B) and 0.4 to 1.0 parts by weight of an amide compound (C) with respect to 100 parts by weight of a polycarbonate resin (A) Resin composition.   The blending amount of the organic acid (B) is 0.05 to 0.2 parts by weight, and the blending amount of the amide compound (C) is 0.5 to 0.8 parts by weight. The polycarbonate resin composition as described.   The polycarbonate resin composition according to claim 1 or 2, wherein the organic acid (B) is a fatty acid having 6 to 30 carbon atoms.   The organic acid (B) is one or two or more fatty acids selected from caprylic acid, capric acid, lauric acid, palmitic acid, stearic acid, arachidic acid, maleic anhydride, and acid-modified siloxane. The polycarbonate resin composition according to claim 1 or 2. The polycarbonate resin composition according to claim 1 or 2, wherein the amide compound (C) is a compound represented by the following general formula (1).
General formula (1)
R ₁ —CONH— (CH ₂ ) _n —NHCO—R _{2
Wherein, R 1,} R ₂ is (straight or branched chain) alkyl group having 6 to 30 carbon atoms, n represents an integer from 2 to 6.   The polycarbonate resin composition according to claim 1 or 2, wherein the organic acid (B) is capric acid and the amide compound (C) is ethylene bisstearyl amide. A molded article formed from the polycarbonate resin composition according to any one of claims 1 to 6.