JPS612748A - Resin composition - Google Patents

Abstract

PURPOSE:To obtain a composition having excellent impact resistance, heat resistance and moldability, and improved solvent resistance, by compounding an aromatic polycarbonate, a thermoplastic graft copolymer, a thermoplastic resin, a polyolefin and an acrylic elastic polymer at specific ratios. CONSTITUTION:The objective composition can be produced by compounding (A) 100pts.(wt.) of a resin mixture composed of (A1) 30-90(wt)% aromatic polycarbonate, (A2) 5-20% thermoplastic graft copolymer prepared by grafting methacrylic acid ester and/or acrylic acid ester and an aromatic vinyl compound to a diene rubber component, and (A3) 10-70% thermoplastic resin (e.g. AS resin) prepared by the copolymerization of an aromatic vinyl monomer and a vinyl cyanide monomer, with (B) 0.5-10pts., preferably 1-5pts. of a polyolefin (e.g. polyethylene) and (C) 1-20pts., preferably 2-10pts. of an acrylic elastic polymer.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to polycarbonate resin compositions. Specifically, the present invention relates to a polycarbonate resin composition that has excellent solvent resistance, impact resistance, heat resistance, and moldability. [Prior art] Polycarbonate resin is an excellent resin for engineering plastics, but it has drawbacks such as poor solvent resistance, poor moldability, and high dependence of impact resistance on thickness. improvement is desired. Various techniques have been proposed to improve the stress crane resistance, moldability, and impact resistance of thick-walled molded products of polycarbonate resins. For example, compositions consisting of polycarbonate resin, AS resin and MBS resin (Special Publications
No. 2-503-+ and No. 55-44777) have improved the thickness dependence of impact resistance and the fluidity of molten resin, but have not improved solvent resistance. A composition consisting of a polycarbonate resin, an MBS resin, and a polyolefin (Patent Publication No. 58-45251) has improved impact resistance, solvent resistance, and fluidity of the molten resin. A composition consisting of a polycarbonate resin, a graft polymer of acrylic rubber, and a polystyrene resin (% disclosure 48
-29308, Japanese Unexamined Patent Publication No. 54-55)
One impact resistance, stress crazing resistance, and moldability are improved, but solvent resistance is not improved. Composition consisting of polycarbonate resin, acrylic comb polymer and polyolefin (% opening 56-
49751 and JP-A-58-34850) have improved low-temperature impact resistance and solvent resistance, but problems remain in the appearance of the molded product. Note that JP-A No. 58-34850 does not mention the addition of As resin, but there is no description of the amount and effect of h'-170 (and there is no mention of adding MBS resin to the history). Not described. As mentioned above, at present, a composition with a good C balance that maintains the characteristics of polycarbonate resin and improves the defects has not yet been obtained. Purpose] The purpose of the present invention is to provide a molded article having excellent impact resistance, fluidity when melted, improved solvent resistance, and a beautiful appearance.
The objective is to provide a well-balanced resin composition. [Structure of the invention] The present invention comprises aromatic polycarbonate containing 30 to 9011 f%
and *Thermoplastic graft copolymer (B) 5 to 20 in which a methacrylic acid ester and/or an acrylic acid ester and an aromatic vinyl compound are grafted to an eno-based rubber component
% by weight, an aromatic vinyl monomer and a 77-vinyl monomer (the obtained thermoplastic resin (C1l 0~
This is a thermoplastic resin composition made by adding 10.5 to 1011 parts of polyolefin a) and 1 to 20 parts by weight of an acrylic elastic electrolyte to 100 parts by weight of a resin mixture consisting of 70% by weight. This invention The polycarbonate resin, which is the component (4) of the resin composition, is produced by the reaction of dihydric phenol with phosgene or carbonate ester.

[Can be manufactured. As the dihydric phenol, bisphenols are preferable, particularly 2,2-bis(4-hydroxyphenyl)propane (
Hereinafter referred to as bisphenol A. 5) Preferably, part or all of the bisphenol A may be replaced with other dihydric phenol. Examples of dihydric phenols other than bisphenol A include hydroquinone, 4,4'-dihydroxydiphenyl, bis(4-hydroxyphenyl)flucan, bis(4-hydroxyphenyl)dicloflucan, bis(
Examples thereof include 4-hydroxyphenyl) sulfide, bis(4-hydroxyphenyl) sulfo/bis(4-hydroxyphenyl) ether, and furkyl-substituted products, aryl-substituted products, and rogene-substituted products thereof. Polycarbonate resins include homopolymers of these 21aIl phenols, copolymers of dihydric phenols of 2fi or more, or copolymers in which a portion of carbonic acid is replaced with other dibasic acids (e.g., terephthalic acid, isophthalic acid, etc.). The thermoplastic graft copolymer of component B1 may be selected from the following, but two or more types may be combined.
For example, what is generally called MBS resin can be mentioned. Examples of the diene rubber component (backbone polymer) in this graft copolymer include polybutadiene, holinfrene, butane-acetic acid copolymer, butadiene-acrylonitrile copolymer, and the like. Examples of methacrylic acid esters and acrylic acid esters include methacrylic acid and acrylic acid such as methyl methacrylate, ethyl methacrylate, ethyl methacrylate, butyl methacrylate, methyl acrylate, ethyl acrylate, butyl acrylate, and butyl acrylate. Lower alkyl esters of are preferred. Furthermore, as aromatic vinyl compounds,
For example, styrene, α-methylstyrene, vinyltoluene, alcocostyrene. Examples include halogenated styrene. These thermoplastic graft copolymers are
Bulk polymerization. It may be produced by any polymerization method such as solution polymerization, suspension polymerization, or emulsion polymerization (and the grafting method may be single-stage grafting or multi-stage grafting. Also, copolymers containing only graft components that are by-produced during production) Examples of the thermoplastic resin of component (C) include what is generally called AS resin. Examples of the aromatic vinyl monomer include Examples of cyanide vinyl monomers include acrylonitrile, methacrimini, etc., with styrene and α-methylstyrene being particularly preferred. Examples of the polyolefin (iso) include tolyl, etc. Polyethylene, polypropylene, ethylene-propylene copolymer, and the like can be mentioned. Furthermore, the acrylic yarn elastic polymer (■) has acrylic acid ester as its main component, meccrylic acid ester, butadiene, and styrene. 7. A copolymer with a copolymerizable polymer such as crylonitrile, for example, an alkyl group having 2 to 2 carbon atoms.
] 2 alkyl acrylates (e.g. 2-ethyl hequinyl acrylate, n-7' tyl acrylate, etc.) 40
~95 wt%, 5-40 wt% butane, 0-30 wt% methyl methacrylate, and 0. A crosslinked rubber with an average particle size of 0.1 to 0.3μ obtained by emulsion polymerization of a mixed monomer consisting of 1 to 3% by weight of an agent (for example, ethylene dimethacrylate, etc.) and adding a flocculant to this. Polymer 50
-80 parts by weight of latex was first added styrene 2O-
803fLi1% and methyl methacrylate 20~5ot
2) Polymerize by adding 0 to 60% of Ryl and 0.1 to 2% of a crosslinking agent (e.g. ethylene dimethacrylate, divinylbenzene, etc.) and 10 to 40 parts of mixed monomers. , 5 to 25 parts of methafurylmilkyl having 1 to 4 carbon atoms in the alkyl group (for example, methyl methacrylate, etc.) containing 0.1 to 4% by weight of a crosslinking agent (for example, ethylene dimethacrylate, divinylbenzene, etc.) It is a multi-component resin obtained by further adding . A specific example of such an acrylic elastic polymer is one commercially available from Kureha Chemical Industry (2) under the product name HIA-15. The resin composition used in the present invention is produced by mixing the five components described above. The mixing ratio is (
5) component, (B) component, (Q component is each 30 to 90
0.5 to 10 parts by weight of the resin mixture consisting of 5 to 20% by weight, To to 70ylL, 0.5 to 10 parts by weight
1 to 20 parts by weight of component (2), particularly preferably 1 to 5 parts by weight of component (2) and 2 to 10 parts by weight of component (g). (1)) If the component is less than 0.5 parts by weight, solvent resistance will be poor.1031! [If the amount exceeds *g, there will be severe delamination and a decrease in heat resistance (which is undesirable. Also, if component (■) is less than 1 part by weight, it will be 0). No improvement is seen. Moreover, if the amount exceeds 20 parts by weight, the heat resistance (especially the deflection temperature under load) will decrease significantly, which is not preferable. The resin composition of the present invention uses these five components in a tumbler-1V type blender, a Nauta mixer, and a Banbury mixer-1 mixed wire roll. It can be manufactured by mixing using a mixer such as an extruder. Furthermore, other resins such as polyester and polyphenylene ether, reinforcing agents such as glass fiber, carbon fiber, calcium carbonate, and silica, within the range that does not impair the purpose of the present invention.
You may also add stabilizers, antioxidants, colorants, UV inhibitors, etc. [Effects of the Invention] The composition of the present invention can be applied to various well-known molding methods, such as injection molding, extrusion molding, compression molding, and 9-turn molding, but is particularly suitable for large-scale injection molding. Furthermore, since the resin composition of the present invention has improved solvent resistance compared to conventional polycarbonate resin compositions,
Since the molded product can be easily painted and the decrease in strength due to painting is reduced, the molded product has a beautiful appearance and excellent rigidity and impact resistance. Furthermore, since the resin composition of the present invention is less likely to produce 70-marks during molding, mold design becomes easier and more complex products can be molded. It also has a layered delamination property (resistant to low-temperature shocks), and has excellent heat resistance and fluidity, making it easy to mold (it has excellent workability and is effective as a molding material for parts of various industrial products such as parts for automobiles and home appliances). The present invention will be specifically explained by showing the example rows below. Each component was mixed in the amounts shown in Table 2 using a VW pre-cooler and pelletized using a triblend extruder (30-piece vented extruder (Nakatani ■), cylinder temperature 250°C) to obtain m-fat composition pellets. Using this Bellett Pubi 115"C-3hr11i drying injection molding machine (Niigata Stube 150/235BM), the resin temperature was 250°C.
A test piece was obtained by injection molding at a mold temperature of 75°C. The physical properties of the obtained test piece are shown in Table 2. still,
The test method for each evaluation item was as follows. O bar 70-; injection pressure + ookg/CIA, cylinder temperature 270°C, mold temperature 70°C, flow length into a rectangular cavity with a width of 5 x depth of 1 x n). 0 frr-mark; Physical properties were determined by visually observing the test piece. 0 layered peeling; same as above 0 solvent resistance; test piece (50 x 8 (l x 2 mm)
t) was immersed in a nonner (Origin Denki ■4260>K) for 5 seconds, and changes in the outer ridges were visually observed. The evaluation results were indicated by ◎, △, and ×. ◎ means good, △ means partially damaged. , and × indicates that the damage has been violated to an extent that it cannot be used for practical purposes.] Table of Procedures Amendment September 2, 1980

Claims (1)

[Claims] 30 to 90% by weight of aromatic polycarbonate (A), 5 to 20% by weight of thermoplastic graft copolymer (B) obtained by grafting a methacrylic ester and/or acrylic ester and an aromatic vinyl compound to a diene rubber component; To 100 parts by weight of a resin mixture consisting of 10 to 70% by weight of a thermoplastic resin (C) obtained by copolymerizing an aromatic vinyl monomer and a vinyl cyanide monomer, 0.5 to 0.5 to 70% by weight of a polyolefin (D) is added. 10 parts by weight and acrylic elastic polymer (
E) 1 to 20 parts by weight of a thermoplastic resin composition.