JPS59223750A - Polycarbonate resin composition - Google Patents

Abstract

PURPOSE:To provide the titled compsn. which has good processing stability and less dependence of impact strength on wall thickness, by adding a diphosphite compd., etc. to a polycarbonate resin compsn. contg. a rubbery acrylate graft copolymer. CONSTITUTION:0.001-1pt.wt. diphosphite compd. of formula I [wherein R1, R2 are each H, alkyl, arylalkyl, aryl, alkylaryl, 2-(4-oxyphenyl)-propyl-substd. aryl, cycloalkyl] or II (wherein R3, R4 are each a 12-15C alkyl) or tri-substd. phosphite of formula III (wherein R5, R6, R7 are each 8-13C alkyl, aryl, alkylaryl) is added to 100pts.wt. resin compsn. obtd. by mixing 60-99wt% polycarbonate resin having an average MW of 10,000-100,000 with 1-40wt% copolymer obtd. by grafting a vinyl compd. onto an acrylate rubber component.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polycarbonate resin composition, and more specifically to a polycarbonate resin composition whose impact strength is less dependent on wall thickness and which has good processing stability.

Polycarbonate resin is widely used as an engineering resin with excellent heat resistance and Mj 5E resistance.

However, as the thickness of polycarbonate wood increases, its strength (with notches) decreases significantly (the strength depends on the wall thickness t'l:), which limits its use.

ABS is a method to eliminate this wall thickness dependence of mido strength.
It is known that addition of resin≧impedance is known, but addition of ABsfJJ resin brings about a decrease in heat resistance and weather resistance. Such deterioration in heat resistance and weather resistance can be overcome by adding a polyolefin, but instead, delamination occurs in molded articles made from such resin compositions (1-), causing a serious practical problem.

Therefore, as a means to solve the above problems, it has been proposed to add an acrylate copolymer to 1 polycarbonate f+Xt Jut (Japanese Patent Publication No. 4B-2
No. 9308). However, since the molding temperature of polycarbonate resin is relatively high, the molded product suffers from discoloration and yellowing, resulting in a lack of processing stability and a loss of commercial value. Furthermore, in order to eliminate such drawbacks, a method of adding an amine compound or a phenol compound is known. However, as mentioned above, since the molding temperature of polycarbonate is relatively high, there are problems such as these additives thermally decomposing, volatilizing and dissipating, and furthermore, the molded product may be colored, foaming may occur, etc. was inevitable to occur.

An object of the present invention is to solve the above-mentioned problems and to provide a polycarboy-to-resin silk composition which has low dependence of impact strength on wall thickness and excellent processing stability.

The present invention provides a resin composition 100% by weight of a polycarbonate resin and 1 to 40% by weight of a graft copolymer of an acrylate rubber component and a vinyl compound.
A polycarbonate resin composition prepared by adding a diphosphite compound represented by the following formula I or ■ or a tri-substituted phosphoric acid ester (゛) represented by the following formula nI in a proportion of 0.001 to 1 part by weight per part by weight. It is a thing.

(Here, R and R2 are water N[, argyl group, arylalkyl group, aryl group, alkylaryl group.

2-(4-oxyphenyl)propyl substituted aryl group,
It is a cycloalkyl group. ) (Here, R3 and R4 are alkyl groups of carbon yy112 to 15.) (Here, "5 + 116 + R7 is carbon 1'!18
~13 alkyl groups, aryl groups, and alkylaryl groups. ) Regarding the polycarbonate resin that is a component of the composition of the present invention, the manufacturing method thereof is not limited, and various types can be used. Typical methods for producing polycarbonate resins include the phosgene method in which bispheno-A.A is reacted with phosgene, and the transesterification method in which bisphenol A is reacted with a carbonic diester such as diphenyl carbonate. For the purpose of the present invention, average molecular weight 10.000 to ion, ooo
, preferably from 15,000 to 40,000. Moreover, one polycarbonate may be used alone, or two or more types may be used in combination. Specific examples of polycarnates that can be used include compounds disclosed in JP-A-57-200445.

Next, the acrylate rubber component in the graft copolymer of an acrylate rubber component and a vinyl compound is an alkyl 2-arylate and/or alkyl methacrylate having 2 to 10 carbon atoms, such as ethyl acrylate and butyl acrylate.

70% by weight or more of an acrylate monomer such as 2-ethylhexyl acrylate or n-octyl methacrylate and other vinyl spinning wheel D1 that can be copolymerized with the monomer, such as methyl meccrylate, styrene, acrylonitrile, By reacting with less than 30% by weight of vinyl acetate etc.?
(It is a rubbery polymer that can be cured, and contains up to 5% by weight of crosslinking agents based on the rubbery polymer, such as polyfunctional agents such as divinylbenzene, ethylene dimethacrylate, triallyl cyanurate, triallyl isocyanate, etc.). A homopolymer of butadiene or isoprene; a copolymer of butadiene or isoprene with styrene; a polymer of ethylene-propylene non-conjugated diene ( Preferred non-conjugated dienes are norbornadiene and ethylidene norbornene.

hexadiene); chlorinated polyethylene rubber; ethylene-i! i1': Other rubber components such as acid vinyl copolymer can be used. Next, vinyl compounds include aromatic hydrocarbon monomers such as styrene and α-methylstyrene; one or more meccrylic acid ester monomers such as methyl meccrylate and ethyl methacrylate; or single fjk forms thereof. and other vinyl monomers, such as vinyl cyanide monomers such as acrylonitrile and methacrylate, and vinyl esters such as vinyl acetate and vinyl propionate.

The graft copolymerization of the acrylate rubber component and the vinyl compound can be carried out by various methods such as bulk polymerization, suspension polymerization, and emulsion polymerization, but emulsion polymerization is generally preferred because it is simple. It is preferable that the graft copolymer contains 30% by weight or more of the acrylate rubber component.

In the resin composition consisting of a polycarbonate resin and a graft copolymer, the polycarbonate resin is 60 to 99% by weight, preferably 70 to 98% by weight, and the graft copolymer is 1 to 40% by weight, preferably 2 to 30% by weight. It should be blended within the following range.

If the blending amount of the graft copolymer is less than 1% by weight, the modification of the polycarbonate resin may be insufficient, □4
If the weight exceeds 0, the excellent properties inherent to the polycarbonate resin will be impaired.

Next, without specifying the diphosphite compound represented by the formula (1) or (2) used as a component of the composition of the present invention, examples of the diphosphite compound of formula I include the following compounds.

Specific examples of diphosphite compounds represented by the formula 1 are as follows.

Next, specific examples of the tri-substituted surface phosphoric acid ester represented by the above formula (2) include the following compounds.

P+" (+oHa)i + P, +0-
CI3H27)3 1 Among the compounds represented by formula (1), (2) or (2) above, the diphosphite compound represented by formula I is preferred. These compounds represented by formula I, II or
Add at a ratio of o oi to 1 weight ratio. If the added paper is less than 0.001 part by weight, the processing stability of the composition will not be improved sufficiently, and if it exceeds 1 part by weight, bubbles may occur in molded products obtained using the composition, or The oven life of the product will be reduced.

Additives such as an ultraviolet absorber 2 and a coloring agent can be appropriately added to the polycarbonate resin composition of the present invention, if necessary.

The polycarbonate resin composition of the present invention can be kneaded by various methods, such as a vented single-screw extruder, a twin-screw kneader, a Banbury mixer, a Funny Goo, and the like. For producing molded articles from the composition thus obtained, well-known molding methods such as injection molding and extrusion molding can be applied, and the above-mentioned composition can be mixed without melt-kneading. Molded articles can also be manufactured by injection molding or extrusion molding.

The polycarbonate resin composition of the present invention has good mechanical stability and is characterized by low dependence of impact strength on wall thickness. Furthermore, since no deterioration in weather resistance or delamination phenomenon is observed, molded products with high commercial value can be obtained. Therefore, the composition of the present invention can be used in automobiles,
It is extremely useful as a molding material for parts of various industrial products such as home appliances.

Next, examples of the present invention are not shown.

Examples 1 to 7 and Comparative Examples 1 to 3 Each component shown in Table 1 was blended in a predetermined ratio, triblended using a V-type blender, and pelletized using an extruder.

This pellet was injection molded using an injection molding machine at a resin temperature of 280°C to obtain a test piece. Table 1 shows the results of measuring the physical properties of this test piece. □1・l: Bisphenol A polycarbonate (average molecular weight 215QO
) Umbrella 2: B-1: Graft copolymer mainly composed of n-butyl acrylate and methyl methacrylate (manufactured by Rohm and Haas, "KM330"
) B-27 Graft copolymer mainly composed of n-butyl acrylate, methyl methacrylate, and a small amount of acrylonitrile (manufactured by Mitsubishi Rayon (General), JW-529J) B-5:
A graft copolymer whose main components are 2-ethyl hegyl acrylate, fukudiene, methyl methacrylate, styrene, and acrylonitrile (manufactured by Kureha Chemical Co., Ltd., "TEKo A28")
J) C-2= -4: Coated part in accordance with ASTM D256, carried out at 23°C, unit: 9 crn/ul 6: Toshiba Machine Co., Ltd. Luzier 545P Ωj extrusion molding machine was used, molding temperature = 280°C, Y type is Tl5K
7105, B, q base, wall thickness 6.2 tone flat plate, real Iir +
i, △Yany Y machining after staying for 10 minutes) = (Continuous molding 1
17 Y Engineering) Special ¥ [Applicant: Idemitsu Petrochemical Co., Ltd.

Claims (1)

[Scope of Claims] 1. The following formula for 100 parts by weight of a resin composition consisting of 60-99% by weight of a polycarbonate resin and 1-40% by weight of a graft copolymer of an acrylate rubber component and a vinyl compound. l Manoko is a polycarbonate resin composition prepared by adding a diphosphite compound represented by ■ or a trilinear phosphite represented by the following formula I11 at a ratio of 0.001 to 1 part (1 part to 1 part). (R3 and R3 are hydrogen, an alkyl group, an alkyl group, an aryl group, an alkylaryl group, a 2-(4-oxyphenyl)propyl-substituted aryl group, and a cycloalkyl group.) (Here, R3 and P4 are Carbon number 12-15
is an alkyl group. ) (Here, R5+ "6 + R7 is an alkyl group having 8 to 13 carbon atoms, an aryl group, or an alkylaryl group.) 2. The diphosphite compound represented by formula (■) is dialkylpentaerythritol diphosphite or dialkyl The composition of claim 1, which is an aryl pentaerythritol diphosphite.