JPS58117247A - Resin composition - Google Patents

Abstract

PURPOSE:To provide a resin compsn. consisting of a mixture of polycarbonate resin, aromatic polyester and acrylic elastomer, exhibiting excellent resistance to solvent and impact and suitable for fabrication of automobile parts, etc. CONSTITUTION:55-90wt% polycarbonate resin (e.g. Panlite L-1250, a product of Teijin Kasei Co.), 10-45wt% aromatic polyester (e.g. polyethylene telephthalate) and 1-20wt% acrylic elastomer (e.g. HIA-15, a product of Kureha Kagaku Kogyo Co.) are kneaded by means of a V-shaped blender, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to 1M resin compositions, and more particularly to polycarbonate resin compositions with improved bulk and impact resistance.

Polycarbonate resin has a high degree of impact resistance, is self-extinguishing, has higher heat resistance than other resins, and has superior electrical properties and dimensional stability. Widely used as ring plastic.

However, polycarbonate resins have the following drawbacks, which limit their use.

1) Since polycarbonate resin has low solvent resistance, large-sized or complex-shaped molded products with large residual stress may cause stress cracks when exposed to certain solvent atmospheres. 2)
When using polycarbonate resin as a molded product,
The impact strength is highly dependent on the thickness of the molded product, for example 3.
In the isot notched impact test of 2 m thick (178 # thick), ductile fracture was shown, whereas 6.4 W (1/4
'thickness) shows brittle fracture, and the impact strength decreases in the thicker region.

Because of these drawbacks, polycarbonate resins are not often used in applications that require resistance to solvents such as gasoline and paints and impact resistance, such as car parts, despite their high impact strength. There wasn't.

As a result of intensive research aimed at improving the above-mentioned drawbacks of polycarbonate resin, the present inventors found that a ternary resin composition consisting of polycarbonate resin, aromatic polyester, and acrylic elastomer has high solvent resistance and equilibrium impact resistance. The present invention has been achieved based on the discovery that

That is, the present invention uses polycarbonate resin (A) 55 to
90% by weight, aromatic polyester (B)s.

~45% by weight and acrylic elastic polymer (C) 1-2
It is a resin composition consisting of 0% by weight.

The resin composition of the present invention has excellent solvent resistance and impact resistance compared to the properties of polycarbonate resin, and also has excellent mechanical properties such as moldability, tensile strength, surface appearance, and heat discoloration resistance. Because of its excellent properties, it can be used in a wide range of applications that were previously limited to polycarbonate resins, such as automobile parts.

Among the composition components of the present invention, the combination of polycarbonate resin and aromatic polyester is described in Tokukai No. 36-14035 and Time WB5B-12537 for the purpose of improving solvent resistance. The introduction of 95% by weight of polycarbonate resin, 1 to 50% by weight of polycarbonate resin, and acrylic core/outer shell polymer is disclosed in JP-A-56-9594.
No. 8 discloses these methods for the purpose of improving the impact resistance of aromatic polyesters. However, none of the above patent publications suggests objects or advantages similar to those of the present invention. In particular, it cannot be inferred from the above patent publication that the composition of the present invention has high solvent resistance.

(A) g of the polycarbonate resin used in the present invention is usually
It is produced by a reaction between a hydric phenol and a carbonate precursor such as phosgene, or a transesterification reaction between a dihydric phenol and a carbonate precursor such as nphenyl carbonate. The dihydric phenol used here is preferably bisphenols, with 2,2-bis(4-hydroxyphenyl)propane (hereinafter referred to as bisphenol A) being particularly preferred. Further, part or all of 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)alkane, bis(4-hydroxyphenyl)dichloroflucan, bis(4-hydroxyphenyl)
Compounds such as sulfite, bis(4-hydroxyphenyl) sulfone, bis(4-hydroxyphenyl) sulfoxide, bis(4-hydro p-xyphenyl) ketone, bis(4-hydroxyphenyl) ether or bis(3-hydroxyphenyl) ether
, S-dibu-mo4-human p-xyphenyl)furopane. The polycarbonate resin may be a homopolymer or a copolymer of two or more of these dihydric phenols, or a blend thereof. Further, a part of the polycarbonate resin may be branched, for example, a polyfunctional aromatic compound may be
Also included are thermoplastic randomly branched polycarbonates reacted with monomers, enols, and/or carbonate precursors.

The aromatic polyester as the component (B) used in the present invention is (Schiff+-)7 lykylene glycol, for example, 2 carbon atoms.
-10 glycols with an aromatic dicarboxylic acid, preferably terephthalic acid and/or isophthalic acid, or their nys'tyl-forming derivatives (polymers).

Glycols used here include ethylene glycol, 1.4-butanediol, neopentyl glycol, and 1.6-hexanediol.

Examples include 1.4-cyclohexane dimetatool and 1.10-decamethylene glycol. More specifically, poly(ethylene terephthalate), poly(1,4-butylene terephthalate), and amorphous poly(ethylene terephthalate) copolyester.

Preferred examples include amorphous poly(1,4-butylene terephthalate) copolyester and amorphous poly(1,4-cyclohexane dimethylene terephthalate) copolyester.

The acrylic elastic polymer as component (C) used in the present invention is a methacrylic ester whose main component is an acrylic ester, butadiene, and styrene.

A copolymer with a copolymerizable monomer such as acrylonitrile, for example, 40 to 95% by weight of an alkyl acrylate having an alkyl group having 2 to 12 carbon atoms (for example, 2-ethylhexyl acrylate, n-butyl acrylate, etc.) and butadiene 5-40% by weight and methyl methacrylate 0-30%
An average particle size of 0.1% by weight obtained by emulsion polymerizing a mixed monomer consisting of 0.01 to 3% by weight of a crosslinking agent (e.g. ethylene dimethacrylate, etc.) and adding a flocculant to this.
A latex containing 50 to 80 parts by weight of a crosslinked rubber copolymer of ~0.3μ is first mixed with 20 to 50% by weight of styrene, 20 to 50% by weight of methyl methacrylate, 2) 0 to 60% by weight of silyl, and a crosslinking agent. (For example, ethylene dimethacrylate, divinylbenzene, etc.) After addition and polymerization of 10 to 40 parts by weight of a mixed monomer of 0.1 to 2% by weight, a crosslinking agent (for example, ethylene dimethacrylate, divinylbenzene, etc.) o, 1 to It is a multicomponent polymer obtained by addition polymerization of 5 to 25 parts by weight of an alkyl methacrylate having a furkyl group having 1 to 4 carbon atoms (for example, methyl methacrylate) containing 4% by weight. A particularly preferred example of such an acrylic elastic polymer is the product name HI from Kureha Chemical Industry ■.
An example is one commercially available as A-15.

In the present invention, the blending ratio of these components is polycarbonate resin (A) ~90% by weight, aromatic polyester (B) 10~45% by weight, and acrylic elastic polymer (C) 1~20% by weight. Even if the blending amounts of components (B) and (C) are less than or greater than the above range, the solvent resistance and impact resistance of the resin composition of the present invention cannot be obtained; If it exceeds the range, the characteristics of polycarbonate resin such as heat resistance and electrical property stability in two dimensions will be seriously impaired, which is not preferable.

The resin composition of the present invention can be prepared by any method. As a method, for example, aromatic polyester (Bl) and acrylic elastic polymer (C) are added to polycarbonate resin (A) and mixed using a V-type blender, super mixer, extruder, Pan Bali mixer, etc. There is a method of mixing in a molten state using a -tar or the like.

The composition of the present invention includes additives for the purpose of modifying the resin,
For example, reinforcing agents such as glass fiber, nucleating agents such as talc,
Heat stabilizers, antioxidants, blowing agents, light stabilizers, flame retardants, plasticizers, mold release agents, antistatic agents, fillers, facial dyes, etc. can be added. Also, for example, polystyrene, mu8
Other resins such as resin, AB8 resin, polyphenylene oxide, etc. may be mixed.

The present invention will be explained below with reference to Examples.

The percentages in the examples are based on weight. Further, evaluation was performed using the following Nyoi method.

1. Solvent resistance evaluation method: Using an injection molding machine, pre-dried pellets were molded into 127 m
Formed into a flat plate of X127■xsw and drilled to 8 m.
After cutting a hole of 1, it was treated at a temperature of 23° C. and a temperature of sol for 24 hours. After the treatment, the M6 bolts were tightened to a torque of 100 lbs., each test solution was applied, and the presence or absence of cracks was observed after 5 minutes. The absence of cracks indicates excellent solvent resistance.

2. Impact resistance evaluation method: Using an injection molding machine, a pre-dried pellet was molded with 64 I
ll X 12.7wX 3.18M and 64wX
Impact test specimens weighing 12.7 dew x 6.35 g were each molded and notched with a 0.25-R notch.

The test piece was treated at a temperature of 23° C. and a humidity of 50° C. for 24 hours, and then its impact strength was measured using an Izotsu impact tester (manufactured by Toyo Seiki ■). The higher the impact strength, the better the impact resistance.

Examples 1 to 6 and Comparative Examples 1 to 3 Pre-dried polycarbonate resin (A) (Teijin Kakai ■
Aromatic polyester (B) and acrylic elastic polymer (C) (manufactured by Kureha Chemical Industry Co., Ltd.: HIA-15) were added in the amounts shown in Table 1, and a V-shaped blender was added. Mix using a 30-degree extruder (
It was extruded into pellets using V8-50 (manufactured by Chuo Machinery Co., Ltd.). The obtained pellets were injection molded by the method described above, and the blowing agent resistance and impact resistance were evaluated. The results are shown in Table 91.

From Table 1, it can be seen that the composition of the present invention has excellent solvent resistance and false impact resistance.

Claims (1)

[Claims] Polycarbonate resin body) 55 to 90% by weight. mll consisting of 10 to 45% by weight of aromatic polyester (B) and 1 to 20% by weight of acrylic elastic polymer (C)
li composition.