JP5317316B2 - Polycarbonate resin composition with improved fluidity - Google Patents

Description

  The present invention relates to a polycarbonate resin composition and a molded article formed therefrom. More specifically, the present invention provides a polycarbonate resin composition having improved fluidity and appearance while maintaining the impact resistance, transparency, heat resistance, thermal stability, etc., which are the characteristics of polycarbonate resin, and a molded product thereof. is there.

  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. On the other hand, in addition to these excellent performances of the resin, in each of the aforementioned fields, a material having a high fluidity (moldability) is required in order to satisfy the design and design requirements. In particular, in recent years, the trend of weight reduction of products has been remarkable, and the actual situation is that the demand for improvement in fluidity of polycarbonate resins has become more prominent.

On the other hand, as techniques for improving the fluidity of the polycarbonate resin composition, various techniques have been proposed since the past, but all have advantages and disadvantages, and satisfactory materials are not necessarily proposed. For example, paying attention to the molecular weight of the polycarbonate resin, a method using a high molecular weight and a low molecular weight in combination, and using a polycarbonate resin branched to either (Patent Document 1), blending an ABS resin or MBS resin in the polycarbonate resin (Patent Document 2) or a method of blending an ABS resin or a phosphate ester with a polycarbonate resin (Patent Document 3) has been proposed. However, these techniques include the above-mentioned excellent characteristics of the polycarbonate resin. There is a problem that any one or more of them are greatly damaged, and there has been a strong demand for improvement.
JP 2001-226576 A JP 2000-319497 A JP 2000-103951 A

Moreover, although the method (patent document 4) which improves a fluidity | liquidity by mix | blending a fatty acid with polycarbonate resin is proposed, although fluidity | liquidity improves, decomposition | disassembly of polycarbonate resin by a fatty acid occurs and mechanical strength is improved. There were fundamental problems such as incurring a decrease in For this improvement, a method of blending an organic acid and an amide compound in a polycarbonate resin has been proposed (Patent Document 5), but the mechanical strength is reduced, but the appearance of the molded product is inferior ( There is a problem of occurrence of silver streak), and a polycarbonate resin composition having both high fluidity and good appearance has not been obtained.
JP 61-162520 A JP 2006-37032 A

  As mentioned above, the conventional technology improves flowability at the expense of one or more of the excellent characteristics inherent in polycarbonate resin, such as impact resistance, transparency, heat resistance, and thermal stability. It was something to do. An object of this invention is to provide the polycarbonate resin composition which improved fluidity | liquidity and the external appearance, maintaining said various performance.

  As a result of diligent research in view of such problems, the present inventors have blended a specific amount of a specific basic metal soap with a polycarbonate resin, thereby reducing the appearance without impairing various excellent performances of the polycarbonate resin. In addition, the present inventors have found that the fluidity is specifically and significantly improved and has completed the present invention.

That is, the present invention is a resin composition comprising 100 parts by weight of a polycarbonate resin (A) and 0.2 to 1.5 parts by weight of a basic metal soap (B), wherein the basic metal soap (B) is a base. It is intended to provide a polycarbonate resin composition with improved fluidity, characterized in that it is a functional calcium behenate , and a molded article comprising the same.

  The present invention is a technique capable of specifically and remarkably improving the fluidity while maintaining the excellent impact strength, transparency, heat resistance, thermal stability, etc. inherent to the polycarbonate resin, and the obtained polycarbonate resin composition The product is excellent in appearance, and can be suitably used as a housing or part of a product in various fields such as electrical machinery, electronics, and ITE, and has an extremely 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 the range of 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.

  The basic metal soap (B) used in the present invention is a metal soap composed of one or more saturated or unsaturated aliphatic monocarboxylic acids having 12 to 30 carbon atoms and magnesium or calcium. . The aliphatic monocarboxylic acid may have a side chain or a functional group such as a hydroxyl group, a ketone group, an aldehyde group, and an epoxy group in its structure. Typical examples include caprylic acid, caproic acid, capric acid, Lauric acid, myristic acid, palmitic acid, stearic acid, alginate, heptadecyl acid, behenic acid, oleic acid, elaidic acid, erucic acid, linoleic acid, linolenic acid, ricinoleic acid, hydroxystearic acid, montanic acid, isostearic acid, epoxy Stearic acid is mentioned. Of these, behenic acid is preferably used.

  The basic metal soap (B) is produced by a known production method from one or more of the above aliphatic monocarboxylic acids and magnesium or calcium oxide or hydroxide, and its magnesium or calcium content Is a basic metal salt contained in an excess of 1 mol or less than the corresponding equivalent.

  The basic metal soap (B) used in the present invention includes basic magnesium stearate, basic calcium stearate, basic magnesium stearate, basic calcium stearate, basic magnesium behenate, basic behenate. Calcium behenate is preferably used among these.

  The compounding quantity of basic metal soap (B) is 0.2-1.5 weight part with respect to 100 weight part of polycarbonate resin (A). If the blending amount is less than 0.2 parts by weight, the effect of improving the fluidity is inferior. If the blending amount exceeds 1.5 parts by weight, the mechanical strength is inferior. More preferably, it is 0.3-1.2 weight part, More preferably, it is 0.5-1.0 weight part.

  There is no particular limitation on the method of blending the basic metal soap (B) into the polycarbonate resin (A), and these are mixed by an optional mixer such as a tumbler, ribbon blender, high speed mixer, etc. It can be easily melt-kneaded with an extruder or the like.

  In addition, other known additives such as mold release agents, ultraviolet absorbers, fillers, antistatic agents, antioxidants, phosphorus-based heat stabilizers, dyes and pigments, and additives (when epoxy is used) may be added at the time of mixing. Bean oil, liquid paraffin, and the like).

  Examples of the filler include glass fiber, glass bead, glass flake, carbon fiber, talc powder, clay powder, mica, potassium titanate whisker, aluminum borate whisker, wollastonite powder, silica powder 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. Unless otherwise noted, based on weight standards.

The details of the used blending components are as follows.
Polycarbonate resin:
Caliber 200-20 (viscosity average molecular weight: 19000) manufactured by Sumitomo Dow
(Hereafter abbreviated as PC)
Basic metal soap:
EC-700H (basic calcium behenate) manufactured by Eishin Kasei
(Hereinafter abbreviated as basic Ca soap)
Organic acid:
NAA-102 (Capric acid) manufactured by NOF Corporation
Behenamide compound manufactured by Nacalai Tesque:
Alfro H-50TF (ethylenebisstearylamide) manufactured by Nippon Oil & Fats Co., Ltd.
(Hereafter abbreviated as EBS)

  The above-mentioned various raw materials are collectively put into a tumbler at the blending ratios shown in Tables 1-2, and after dry mixing for 10 minutes, using a twin screw extruder (KTX37 manufactured by Kobe Steel), the melting temperature is 280 ° C. And kneaded to obtain pellets of the polycarbonate resin composition. Various test pieces were processed from the obtained pellets using an injection molding machine (J100E-C5 manufactured by Nippon Steel Works), and various data were collected by the following methods.

(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 140 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) Appearance Evaluation A flat plate test piece (50 × 90 × 3 mm) was prepared under a melting temperature of 320 ° C., and the presence or absence of silver streak on the surface of the molded product was visually determined.

  As shown in Table 1, when the polycarbonate resin composition satisfied the constituent requirements of the present invention (Examples 1 to 3), the standard was satisfied over all evaluation items.

As shown in Table 2, when the polycarbonate resin composition did not satisfy the constituent requirements of the present invention, each case had some drawbacks.
In Comparative Example 1, the blending amount of the basic Ca soap was further less than the lower limit of the specified range, and the fluidity was inferior.
In Comparative Example 2, the compounding amount of the basic Ca soap was more than the upper limit of the specified range, and the mechanical strength and appearance were inferior.
In Comparative Example 3, capric acid was used instead of basic Ca soap, but the fluidity was inferior.
Comparative Examples 4 and 5 are examples in which behenic acid was used instead of the basic Ca soap, but both were poor in fluidity. In Comparative Example 5, the amount of behenic acid was larger than that in Comparative Example 4, so that the mechanical strength was inferior.
Comparative Example 6 is an example in which capric acid and EBS were used in combination instead of the basic Ca soap, but the fluidity, mechanical strength, and heat resistance were good, but the appearance was poor.

Claims (3)

A resin composition comprising 100 parts by weight of a polycarbonate resin (A) and 0.2 to 1.5 parts by weight of a basic metal soap (B), wherein the basic metal soap (B) is basic calcium behenate. A polycarbonate resin composition having improved fluidity.   2. The polycarbonate resin having improved fluidity according to claim 1, wherein the amount of the basic metal soap (B) is 0.3 to 1.2 parts by weight per 100 parts by weight of the polycarbonate resin (A). Composition. A molded article formed from the polycarbonate resin composition with improved fluidity according to claim 1 or 2 .