JPH0885749A - Low-luster polycarbonate resin composition - Google Patents

Abstract

PURPOSE: To obtain a polycarbonate resin compsn. which is excellent not only ultraviolet resistance and mechanical characteristics but also gives a molding having the surface with a low luster. CONSTITUTION: This low-luster polycarbonate resin compsn. contains 5-50 pts.wt. polymethyl methacrylate, 70-30 pts.wt. polycarbonate resin, 3-30 pts.wt. impact modifier, and 1-20 pts.wt. talc of which at least 98% of the total particles have particle sizes lower than 44μm and which has an aspect ratio of 4-24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polycarbonate resin composition using an aromatic polycarbonate (hereinafter also referred to as PC) and polymethylmethacrylate (hereinafter also referred to as PMMA), and particularly obtained by the composition. If the surface of the molded product has low gloss (low gloss),
It relates to a low-gloss polycarbonate resin composition.

[0002]

2. Description of the Related Art Aromatic polycarbonate resins are widely used as high-performance resins, that is, engineering plastics, because they are excellent in heat resistance, impact resistance and mechanical strength. Furthermore, blending with various resins is known utilizing the characteristics of aromatic polycarbonate.

[0003] An improved technique relating to a two-component polymer alloy of polycarbonate / polymethylmethacrylate is disclosed in, for example, Japanese Patent Application No. 6-74018 (the title of the invention: thermoplastic resin composition) and Japanese Patent Application No. 6- 1929
No. 25 (Title of invention: Polycarbonate resin composition)
Is disclosed in.

The molded articles obtained by these improved techniques have improved properties relating to UV stability. However, the surface of molded articles obtained from these compositions as raw materials shows high gloss.

Low glossiness is required for applications of molded articles made of such a polycarbonate resin composition, such as computer terminal devices, office automation equipment, housings for electric and electronic products, and various automobile parts. There are many things that are done. However, in order to achieve the object by an additional process such as so-called matte coating or embossing, it causes an increase in manufacturing cost, which is not preferable.

The addition of matting agents such as finely divided silica, silicates, alumina and other mineral fillers often adversely affects physical properties such as impact strength and is not preferred. Many polymeric matting agents have been tried to be added, but it has been pointed out that not only impact strength but also heat distortion temperature, weather resistance, light stability, etc. may be adversely affected. There is.

[0007]

DISCLOSURE OF THE INVENTION The present invention is a polycarbonate which, in addition to excellent ultraviolet resistance properties and mechanical properties, has a low gloss on the surface of a molded article as compared with conventional polycarbonate resin compositions. An object is to provide a resin composition.

[0008]

The object of the present invention is: A) 5 to 50 parts by weight of poly (methyl methacrylate), and B).
Polycarbonate resin 70 to 30 parts by weight, C) Impact modifier 3 to 30 parts by weight, and D) At least 98% of the total amount has a particle size smaller than 44 μm, and its aspect ratio is 4 to 24. A low-gloss polycarbonate resin composition containing 1 to 20 parts by weight of talc.

The component A) polymethylmethacrylate (PMMA) in the present invention is a thermoplastic resin containing methylmethacrylate as a main component. However, in addition, ethyl methacrylate, propyl methacrylate,
It may contain an alkyl ester of methacrylic acid, which is exemplified by isopropyl methacrylate, n-butyl acrylate, isobutyl acrylate, amyl acrylate, hexyl acrylate, and the like.

The kind of the aromatic polycarbonate resin of the component (B) used in the present invention is not particularly limited. However, it is a molten product obtained by melt polymerization of an aromatic dihydroxy compound and a carbonic acid diester, and the equivalent ratio (I) of the phenolic end group (I) and the non-phenolic end group (II) in the polycarbonate is / (II) is 1 /
Polycarbonate having 19 or more is preferably applicable.

Here, the above-mentioned phenolic terminal group (I)
Is the expression

[0012]

[Chemical 3] And the non-phenolic end group (II) is

[0013]

[Chemical 4] It is represented by. Here, in the above formula, R ¹ and R ² are each independently a hydrogen atom, a linear or branched, unsubstituted or halogen atom having 20 or less carbon atoms, preferably fluorine,
An alkyl group substituted with a chlorine or bromine atom is shown.

The equivalent ratio of the terminal groups of the polycarbonate can be easily adjusted by changing the molar ratio of the aromatic dihydroxy compound and the carbonic acid diester, which are raw materials, when the polycarbonate is produced by melt polymerization.

For example, when bisphenol A is used as the aromatic dihydroxy compound and diphenyl carbonate is used as the carbonic acid diester, the terminal group of the polycarbonate is a phenolic residue derived from bisphenol A and a phenyl group derived from diphenyl carbonate,
When the molar ratio of bisphenol A is increased, the equivalent ratio (I) / (II) of the phenolic terminal group (I) and the non-phenolic terminal group (II) in the produced polycarbonate becomes large.

The polycarbonate may be branched. Such branched polycarbonates are obtained as branched thermoplastic random branched carbonates by reacting polyfunctional aromatic compounds with diphenols and / or carbonate precursors.

The method itself for producing the polycarbonate of the present invention is known, and is a method for synthesizing a polycarbonate by transesterification reaction of an aromatic dihydroxy compound and a carbonic acid diester in a molten state.

The aromatic dihydroxy compound is not particularly limited, and various known compounds can be used. As an example, the following formula

[0019]

[Chemical 5] (Wherein R ^a and R ^b are each independently a halogen or a monovalent hydrocarbon group, and X is —C (R ^c ) (R ^d ).
-, -C (= R ^e )-, -O-, -S-, -SO- or -SO _2- , R ^c and R ^d are each independently a hydrogen atom or a monovalent hydrocarbon group. R ^e is a divalent hydrocarbon group, and p and q each independently represent an integer of 0 to 4. ), For example, bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxyphenyl) propane, 2,2-bis (4 -Hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) octane, bis (4-hydroxyphenyl) phenylmethane, 2,2-bis (4-hydroxy-1-methylphenyl) propane, 1,1- Bis (hydroxyaryl) alkanes such as bis (4-hydroxy-t-butylphenyl) propane and 2,2-bis (4-hydroxy-3-bromophenyl) propane; 1,1-bis (4-hydroxyphenyl) Bis (hydroxyaryl) cycloalkanes such as cyclopentane and 1,1- (4-hydroxyphenyl) cyclohexane; 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3,3'-dimethylphenyl ether, etc. Dihydroxy aryl ethers; 4,4'-dihydroxydiphenyl sulfide, 4,4'-dihydroxy-3,
Dihydroxydiaryl sulfides such as 3'-dimethylphenyl sulfide; 4,4'-dihydroxydiphenyl sulfoxide, dihydroxydiaryl sulfoxides such as 4,4'-dihydroxy-3,3'-dimethyldiphenyl sulfoxide; 4,4'-dihydroxy Diphenyl sulfone,
Examples thereof include, but are not limited to, dihydroxydiarylsulfones such as 4,4′-dihydroxy-3,3′-dimethyldiphenylsulfone. Of these, 2,2-bis (4-hydroxyphenyl) propane is particularly preferably used. In addition to the above, as the aromatic dihydroxy compound, the following general formula

[0020]

[Chemical 6] (Wherein R ^f is each independently a hydrocarbon group having 1 to 10 carbon atoms or a halogen compound thereof or a halogen atom, and m is an integer of 0 to 4), for example, resorcin. , And 3-methylresorcin, 3-
Ethylresorcin, 3-propylresorcin, 3-butylresorcin, 3-t-butylresorcin, 3-phenylresorcin, 3-cumylresorcin, 2,3,4,6-tetrafluororesorcin, 2,3,4,6 -Substituted resorcins such as tetrabromoresorcin; catechol; hydroquinone, and 3-methylhydroquinone, 3-ethylhydroquinone, 3-propylhydroquinone, 3-butylhydroquinone, 3-t-butylhydroquinone, 3-phenylhydroquinone, 3-cumyl Hydroquinone, 2,3,5,6-tetramethylhydroquinone, 2,3,5,6-tetra-t-butylhydroquinone, 2,3,
Substituted hydroquinone such as 5,6-tetrafluorohydroquinone and 2,3,5,6-tetrabromohydroquinone, and the following formula

[0021]

[Chemical 7] 2,2,2 ', 2'-tetrahydro-3,3,3', 3'-tetramethyl-1,1'-spirobi- [1H-indene] -7,7'-diol represented by It can also be used.

These aromatic dihydroxy compounds may be used alone or in combination of two or more kinds.

The carbonic acid diester is not particularly limited, and examples thereof include diphenyl carbonate, ditolyl carbonate, bis (chlorophenyl) carbonate, m-cresyl carbonate, dinaphthyl carbonate, bis (diphenyl) carbonate, diethyl carbonate, dimethyl carbonate, dibutyl. Examples include, but are not limited to, carbonates, dicyclohexyl carbonates, and the like. Diphenyl carbonate is preferably used.

These carbonate esters may be used alone or in combination of two or more.

The carbonic acid diester may contain a dicarboxylic acid or a dicarboxylic acid ester. Examples of dicarboxylic acids and dicarboxylic acid esters include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, diphenyl terephthalate, and diphenyl isophthalate; succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacine. Acids, decanedioic acid, dodecanedioic acid, diphenyl sebacate, diphenyl decanedioate, diphenyl dodecanedioate, and other aliphatic dicarboxylic acids; cyclopropanedicarboxylic acid, 1,2-cyclobutanedicarboxylic acid, 1,3-cyclobutanedicarboxylic acid , 1,2-cyclopentanedicarboxylic acid, 1,3-cyclopentanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, cyclopropanedicarboxylic acid diphenyl, 1 2,2-Cyclobutanedicarboxylic acid di Eniru, 1,3-cyclobutane dicarboxylic acid, diphenyl 1,2-cyclopentane dicarboxylic acid, diphenyl 1,3-cyclopentane dicarboxylic acid, diphenyl 1,2-cyclohexane dicarboxylic acid diphenyl, 1,
Examples thereof include alicyclic dicarboxylic acids such as diphenyl 3-cyclohexanedicarboxylic acid and diphenyl 1,4-cyclohexanedicarboxylic acid.

These dicarboxylic acids or dicarboxylic acid esters may be used alone or in combination of two or more. The dicarboxylic acid or dicarboxylic acid ester is contained in the carbonic acid diester in an amount of preferably 50 mol% or less, more preferably 30 mol% or less.

In producing a polycarbonate, it is also possible to use a polyfunctional compound having three or more functional groups in one molecule together with an aromatic dihydroxy compound and a carbonic acid diester. As these polyfunctional compounds, compounds having a phenolic hydroxyl group or a carboxyl group are preferable, and a compound containing three phenolic hydroxyl groups is particularly preferable.

Specific examples of preferred compounds include 1,1,1-
Tris (4-hydroxyphenyl) ethane, 2,2 ', 2 "-tris (4-hydroxyphenyl) diisopropylbenzene,
α-methyl-α, α ', α'-tris (4-fodoxyphenyl) -1,4-diethylbenzene, α, α', α "-tris (4-hydroxyphenyl) -1,3,5-tri Isopropylbenzene, phloroglysin, 4,6-dimethyl-2,4,6-tri (4-hydroxyphenyl) -heptane-2,1,3,5-tri (4-hydroxyphenyl) benzene, 2,2-bis -[4,4- (4,4'-dihydroxyphenyl) -cyclohexyl] -propane, trimellitic acid, 1,3,5-benzenetricarboxylic acid, pyromellitic acid and the like can be mentioned.

Particularly preferably, 1,1,1-tris (4-hydroxyphenyl) ethane, α, α ', α "-tris (4-hydroxyphenyl) -1,3,5-triisopropylbenzene and the like are used. The polyfunctional compound is preferably 0.03 mol or less, more preferably 0.001 to 0.02 mol, particularly preferably 0.001 to 0.01 mol, per mol of the aromatic dihydroxy compound. Used in quantity.

When producing polycarbonate,
The resulting polycarbonate has the following formula

[0031]

Embedded image (Here, the aromatic ring or the chromanyl group may be substituted with halogen or an alkyl group having 1 to 9 carbon atoms.)
Further, a compound capable of introducing one or more of the terminal groups can be used. Examples of the compound capable of introducing the hydroxyl group represented by the formula (1) include diol compounds such as bisphenol A. Further, phenol, diphenyl carbonate or the like as the compound capable of introducing the phenoxy group represented by the formula (2); pt-butylphenol represented as the compound capable of introducing the pt-butylphenoxy group represented by the formula (3) , P
-T-butylphenyl phenyl carbonate, pt-
Butylphenyl carbonate and the like; p-cumylphenol, p-cumylphenylphenylcarbonate, p as a compound capable of introducing a p-cumylphenoxy group (p-phenylisopropylphenoxy group) represented by the formula (4)
-Cumyl phenyl carbonate etc. can be mentioned respectively. The chromanylphenoxy group represented by the above formula (5) has the following formula:

[0032]

[Chemical 9] And a chromanylphenoxy group such as As the compound capable of introducing the group represented by the formula (5-1), 2,2,4-trimethyl-4- (4-hydroxyphenyl) chroman, 2,2,4,6-tetramethyl-4- (3 , 5-dimethyl-4-
Hydroxyphenyl) chroman, 2,3,4-trimethyl-2-
Ethyl-4- (3-nonyl-4-hydroxyphenyl) -7-nonyl-chroman, 2,2,4-trimethyl-4- (3,5-diethyl-4-
Hydroxyphenyl) -6-ethylchroman, 2,2,4,6,8-
Pentamethyl-4- (3,5-dimethyl-4-hydroxyphenyl) chroman, 2,2,4-triethyl-3-methyl-4- (4-hydroxyphenyl) chroman, 2,2,4-trimethyl-4- (3-
Bromo-4-hydroxyphenyl) chroman, 2,2,4-trimethyl-4- (3-bromo-4-hydroxyphenyl) -6-bromochroman, 2,2,4-trimethyl-4- (3,5-dibromo -4-Hydroxyphenyl) -6-bromochroman, 2,2,4-trimethyl-4- (3,5-dibromo-4-hydroxyphenyl) -6,8-
Dibromochroman and the like can be mentioned. Of these, 2,2,4-trimethyl-4- (4-hydroxyphenyl)
Chroman is preferred; 2,2,3-trimethyl-3- (4-hydroxyphenyl) chroman, 2,2,3,6-tetramethyl-as the compound capable of introducing the group represented by the formula (5-2) 3- (3,5
-Dimethyl-4-hydroxyphenyl) chroman, 2,3,4-trimethyl-2-ethyl-3- (3-nonyl-4-hydroxyphenyl) -7-nonyl-chroman, 2,2,3-trimethyl-3 -(3,5-
Diethyl-4-hydroxyphenyl) -6-ethyl-chroman, 2,2,3,6,8-pentamethyl-3- (3,5-dimethyl-4-hydroxyphenyl) chroman, 2,2,3-triethyl- 3-methyl-3- (4-hydroxyphenyl) chroman, 2,2,3-trimethyl-3- (3-bromo-4-hydroxyphenyl) -6-bromochroman, 2,2,3, -trimethyl-3- (3,5-dibromo-4-
Hydroxyphenyl) -6-bromochroman, 2,2,3-trimethyl-3- (3,5-dibromo-4-hydroxyphenyl) -6,8
-Dibromochroman, etc., among which 2,2,3-trimethyl-3- (4-hydroxyphenyl)
Chroman is preferred; 2,4,4-trimethyl-2- (2-hydroxyphenyl) chroman, 2,4,4,6-tetramethyl-as the compound capable of introducing the group represented by formula (5-3) 2- (3,5-
Dimethyl-2-hydroxyphenyl) chroman, 2,3,4-trimethyl-4-ethyl-2- (3,5-dimethyl-2-hydroxyphenyl) -7-nonyl-chroman, 2,4,4-trimethyl- 2-
(3,5-dimethyl-2-hydroxyphenyl) -6-ethylchroman, 2,4,4,6,8-pentamethyl-2- (3,5-dimethyl-2-hydroxyphenyl) -6-ethylchroman, 2,4,4-trimethyl-2- (3-bromo-2-hydroxyphenyl) chroman,
2,4,4-Trimethyl-2- (3-bromo-2-hydroxyphenyl) -6-bromochroman, 2,4,4-trimethyl-2- (3,5-dibromo-2-hydroxyphenyl) -6- Bromochroman, 2,
4,4-trimethyl-2- (3,5-dibromo-2-hydroxyphenyl) -6,8-dibromochroman and the like can be mentioned, among which 2,4,4-trimethyl-2-2- (Hydroxyphenyl) chroman is preferred; as a compound capable of introducing the group represented by the formula (5-4), 2,4,4-trimethyl-2- (4-
(Hydroxyphenyl) chroman, 2,4,4,6-tetramethyl-
2- (3,5-dimethyl-4-hydroxyphenyl) chroman, 2,
4,4-triethyl-2- (4-hydroxyphenyl) chroman, 2,3,4-trimethyl-4-ethyl-2- (3,5-dimethyl-4-
Hydroxyphenyl) -7-nonyl-chroman, 2,4,4-trimethyl-2- (3,5-diethyl-4-hydroxyphenyl) -6-
Ethyl-chroman, 2,4,4,6,8-pentamethyl-2- (3,5-dimethyl-4-hydroxyphenyl) -6-ethylchroman, 2,
4,4-trimethyl-2- (3-bromo-4-hydroxyphenyl)
Chroman, 2,4,4-trimethyl-2- (3-bromo-4-hydroxyphenyl) -6-bromochroman, 2,4,4-trimethyl-2-
(3,5-dibromo-4-hydroxyphenyl) -6-bromochroman, 2,4,4-trimethyl-2- (3,5-dibromo-4-hydroxyphenyl) -6,8-dibromochroman, etc. Of these, 2,4,4-trimethyl-2- (4-hydroxyphenyl) chroman is particularly preferable.

In the above, the aromatic ring or the aliphatic ring is
It may be further substituted with halogen or an alkyl group having 1 to 9 carbon atoms. These compounds may be used alone or in combination of two or more.

Aromatic dihydroxy compound 1 is preferred.
1.00 to 1.30 mol, especially 1.01 to mol
Both are reacted in the presence of a catalyst using a carbonic acid diester in an amount of 1.20 mol.

As the catalyst, for example, the applicant of the present invention can
The compounds proposed in 4-175368 can be used. As examples, (a) organic acid salts, inorganic acid salts, oxides of metals such as alkali metals and alkaline earth metals,
Preference is given to using hydroxides, hydrides or alcoholates. Specific examples of these compounds include sodium hydroxide, potassium hydroxide, lithium hydroxide, sodium hydrogen carbonate, potassium hydrogen carbonate, lithium hydrogen carbonate, sodium carbonate, potassium carbonate, lithium carbonate, sodium acetate, potassium acetate, lithium acetate, stearin. Sodium acid, potassium stearate, lithium stearate, sodium borohydride, lithium borohydride,
Sodium phenyl borohydride, sodium benzoate, potassium benzoate, lithium benzoate, disodium hydrogen phosphate, dipotassium hydrogen phosphate, dilithium hydrogen phosphate, disodium salt of bisphenol A, dipotassium salt, dilithium salt, Sodium, potassium salt, lithium salt, etc. of phenol; calcium hydroxide, barium hydroxide, magnesium hydroxide, strontium hydroxide, calcium hydrogen carbonate, barium hydrogen carbonate, magnesium hydrogen carbonate, strontium hydrogen carbonate, calcium carbonate, barium carbonate, Examples thereof include magnesium carbonate, strontium carbonate, calcium acetate, barium acetate, magnesium acetate, strontium acetate, and strontium stearate, but are not limited thereto. These compounds may be used alone or in combination of two or more. These alkali metal compounds and / or alkaline earth metal compounds are preferably 10 ^-8 to 10 ^-3 mol, more preferably 10 ^-7 to 10 ^-6 mol, particularly preferably 1 mol of the aromatic dihydroxy compound. 10 ^-7 ~ 8
Used in an amount of × 10 ^-7 mol.

Further, as a catalyst, together with the above-mentioned alkali metal compound and / or alkaline earth metal compound, (b)
You may use a basic compound. As an example of the basic compound, for example, a nitrogen compound, specifically, an ammonium having an alkyl, aryl or araryl group such as tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrabutylammonium hydroxide or trimethylbenzylammonium hydroxide. Hydroxides; tertiary amines such as trimethyleneamine, triethylamine, dimethylbenzylamine, triphenylamine; secondary or primary having alkyl groups such as methyl group, ethyl group, etc., aryl groups such as phenyl group, toluyl group, etc. Amines; ammonia; tetramethylammonium borohydride, tetrabutylammonium borohydride, tetrabutylammonium tetraphenylborate, tetramethylammonium And the like can be mentioned basic salts such as tiger tetraphenylborate, but are not limited to. Of these, ammonium hydroxides are particularly preferable. These basic compounds may be used alone or in combination of two or more.

In the component (B) of the present invention, by using a combination of the above-mentioned (a) alkali metal compound and / or alkaline earth metal compound and (b) nitrogen-containing basic compound as a catalyst, A high molecular weight polycarbonate can be obtained with high polymerization activity.

Alternatively, as a catalyst, (a) an alkali metal compound and / or an alkaline earth metal compound, (b)
A combination of a nitrogen-containing basic compound and at least one of (c) boric acid and boric acid ester can be used. When a catalyst composed of such a combination is used, (a) an alkali metal compound and / or an alkaline earth metal compound is used in an amount as described above, and (b) a nitrogen-containing basic compound is used in an amount of 1 mol of an aromatic dihydroxy compound. With respect to 10 ^-6 to 10 ^-1 mol, especially 10 ^-5
It is preferably used in an amount of 10 ⁻² mol. Examples of the boric acid or boric acid ester (c) include the following general formula B (OR ³ ) _n ′ (OH) _{3−n ′} (wherein R ³ is a hydrogen atom, an aliphatic hydrocarbon group, or an alicyclic carbon atom). A hydrogen group or an aromatic hydrocarbon group, and n'is 1 to
It is an integer of 3. ) Are preferred, and examples thereof include boric acid, trimethyl borate, triethyl borate,
Examples thereof include tributyl borate, trihexyl borate, triheptyl borate, triphenyl borate, tritolyl borate, and trinaphthyl borate. Of these, triphenyl borate is particularly preferable. These (c) boric acid or boric acid ester of the above (a), when used as a catalyst with (b), the amount 10 ^-6 10 ^-1 mole relative to 1 mole of the aromatic dihydroxy compound, particularly 10 ^{- 5} to 1
It is preferably 0 ^-2 mol.

Conditions such as temperature and pressure at the time of the melt polymerization reaction are arbitrary, and known conventional conditions can be used. Specifically, the reaction in the first step is preferably 80 to 250.
C., more preferably 100 to 230.degree. C., particularly preferably 120 to 190.degree. C., preferably 0 to 5 hours, more preferably 0 to 4 hours, particularly preferably 0.25 to 3 hours.
Perform at normal pressure for time. Then, the reaction temperature is raised while the reaction system is under reduced pressure to cause the reaction between the aromatic dihydroxy compound and the carbonic acid diester, and finally, under the reduced pressure of 0.05 to 5 mmHg, the aromatic dihydroxy compound is heated at a temperature of 240 to 320 ° C. It is preferred to carry out the reaction of with a carbonic acid diester.

The reaction between the aromatic dihydroxy compound and the carbonic acid diester as described above may be carried out continuously or batchwise. Further, the reaction apparatus used when carrying out the above reaction may be of a tank type, a tube type, or a column type.

As the component (C) of the polycarbonate resin composition according to the present invention, α, β-unsaturated carboxylic acid such as acrylic acid and methacrylic acid, methyl (meth) acrylate, ethyl (meth) acrylate, propyl ( (Meth) acrylate, butyl (meth) acrylate, 2-
Α, β-Unsaturated carboxylic acid esters such as ethyl (meth) acrylate and 2-ethylhexyl methacrylate; α, β unsaturated dicarboxylic acid anhydrides such as maleic anhydride and itaconic anhydride; maleimide, N-methylmaleimide , N-ethylmaleimide, N-phenylmaleimide, N-0-chlorophenylmaleimide and other α, β-unsaturated dicarboxylic acid imide compounds; and the like. Used in two or more kinds.

The copolymer of component (C) is preferably a graft copolymer obtained by graft copolymerizing other components in the presence of a rubbery polymer, and more preferably ABS.
Resin (acrylonitrile / butadiene / styrene copolymer), AES resin (acrylonitrile / ethylene / propylene / styrene copolymer), ACS resin (acrylonitrile / chlorinated polyethylene / styrene copolymer), A
AS resin (acrylonitrile / acrylic elastic polymer /
Styrene copolymer).

In the component (C), there is no particular limitation on the composition ratio of each component constituting each, and each component is blended according to the application. The method for producing the copolymer of component (C) is also not particularly limited, and commonly known methods such as bulk polymerization, solution polymerization, bulk suspension polymerization, suspension polymerization, and emulsion polymerization can be used. It can also be obtained by blending separately copolymerized resins.

The component (C) is added in an amount of 3 to 30 parts by weight, preferably 5 to 25 parts by weight. The amount of component (C) is 3
If the amount is less than 30 parts by weight, the effect of the present invention is not exhibited and
If the amount is more than the amount by weight, the rigidity of the obtained molded article decreases.

The component (D) in the polycarbonate resin composition according to the present invention is talc, which is known as one kind of inorganic filler. Talc is Mg ₂ Si ₄ O ₁₀
It is a kind of mineral having a structure of (OH) ₂ . Normally,
It is an off-white solid with the smooth feel of leaves or scales and is also called talc. Used as a fine powder as a filler for plastics and rubber.

To achieve the objects of the present invention, at least 98% or more of the final blend has a particle size of 44 μm or less, and the ratio of average diameter to thickness, that is, the aspect ratio is in the range of 4 to 24. 1 to 20 parts by weight are added. These particle size and / or aspect ratio,
If the blending amount deviates from these ranges, disadvantages such as poor appearance and deterioration of physical properties occur.

For the production of a molded product from the polycarbonate resin composition according to the present invention, usual molding means such as injection molding, extrusion molding, blow molding, compression molding and the like can be applied.

In addition to the above-mentioned additives, the polycarbonate resin composition according to the present invention includes reinforcing agents such as glass fiber, carbon fiber, metal whiskers, carbon black, calcium carbonate and glass beads. Such as fillers, paraffin wax, lubricants such as silicone oil, hindered phenols and other antioxidants, epoxy-based monomers, weather resistance-imparting agents such as triazine-based, halogen-based or phosphoric acid-based flame retardants, etc. Well-known additives can be added.

In addition, other polymers such as polycarbonate, polybutylene terephthalate, polyethylene terephthalate, polyethylene and polyethylene / propylene copolymer may be used in combination.

[0050]

The present invention will be further disclosed below with reference to Examples. The materials used for carrying out the thermoplastic resin composition according to the present invention are as follows.

Polycarbonate (1) is a polycarbonate resin containing less than 1% phenolic end groups, Le
xan141 (trademark; manufactured by General Electric Co.) was used.

Polycarbonate (40) is a LX polycarbonate having a 40% phenolic end group and having a low end cap (trade name; manufactured by GE Plastics Co., Ltd.).
It was used.

VH1 (trade name; manufactured by Mitsubishi Rayon Co., Ltd.) was used as polymethylmethacrylate (PMMA). In addition, Acrypet (trademark: manufactured by Mitsubishi Rayon Co., Ltd.) and Sumipex (trademark: manufactured by Sumitomo Chemical Co., Ltd.)
Etc. can be used.

As the acrylonitrile-butylene-stadiene (ABS) copolymer resin, UX050 (trade name: manufactured by Ube Saikon Co., Ltd.) was used.

Further, MMA-butyl acrylate copolymer EXL2311 (trade name: manufactured by Kureha Chemical Co., Ltd.) was used.

As talc (1), LMS-200
(Product name: Fuji Talc Co., Ltd.) was used.

As talc (2), LMS-1
00 (trade name: manufactured by Fuji Talc Co., Ltd.) was used.

The raw materials such as polycarbonate and PMMA were melt-kneaded by a 30 mm twin screw extruder manufactured by Toshiba Machine Co., Ltd. The extrusion conditions were set at a screw rotation speed of 150 rpm and a barrel temperature of 260 ° C. to produce pellets. It is also possible to use a 50 mm single screw extruder as well.

The following tests were conducted to confirm the physical properties of the composition thus obtained. In carrying out the test according to ASTM, the test piece used was an 80t injection molding machine manufactured by Toyo Kikai Kinzoku Co., Ltd.
It was prepared at 0 ° C. and a mold temperature of 60 ° C.

The composition ratios of the composition and the test results are shown in Table 1.
And as shown in Table 2. In the low-gloss polycarbonate resin composition according to the present invention, by blending talc (1) and talc (2) in the proportions shown in the table of Examples, polycarbonate PC that has been conventionally used
(1) and a polycarbonate PC (4
Regardless of 0), a low gloss molded article could be obtained. Table 1 uses a polycarbonate resin that has been used conventionally. In addition, the glossiness was evaluated by setting the incident angle and the reflection angle to 60 degrees, and
Gloss meter (Glossm according to D-523-62T
eter).

As the physical properties, according to the usual ASTM method,
Notched Izod test (NII), flexural modulus (F
M) and heat distortion temperature (HDT) were tested.

[0062]

[Table 1]

Further, Table 2 shows the case where a polycarbonate resin having a low end sealing is used, and as in the case of the previous embodiment,
A molded article with low gloss could be obtained.

[0064]

[Table 2]

[0065]

[Effect] The PMMA blended in the polycarbonate resin composition according to the present invention is excellent in UV stability and bending strength, and the molded product obtained from the resin composition has a lower gloss than conventional products. Will be improved. Therefore, a molded product suitable for outdoor use such as a window frame or an automobile interior / exterior product can be achieved without secondary processing such as painting or matting.

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location C08L 33/06 55/02 LME LMF 69/00 LPP

Claims (4)

[Claims] 1. A) poly (methyl methacrylate) 5
˜50 parts by weight, B) 70 to 30 parts by weight of polycarbonate resin, C) 3 to 30 parts by weight of impact modifier, and D) at least 98% of the total amount of particles is smaller than 44 μm, and Talc with a ct ratio of 4-24
A low-gloss polycarbonate resin composition containing 1 to 20 parts by weight. 2. The above polycarbonate resin has a phenolic terminal group (I) represented by the following formula: And the non-phenolic end group (II) is represented by the following formula: And the formula (I) / (II) is 1/19 or more. (In the above formula, R ¹ and R ² are each independently
A low-gloss polycarbonate resin composition according to claim 1, which is a hydrogen atom or a linear or branched, unsubstituted or halogen-substituted alkyl group having 20 or less carbon atoms. 3. The polycarbonate resin composition according to claim 1, wherein the impact resistance improver is an ABS resin. 4. The polycarbonate resin composition according to claim 1, wherein the impact resistance improver is an acrylic impact resistance absorber.