JPS5898355A - Thermoplastic resin composition - Google Patents

Abstract

PURPOSE:To provide a thermoplastic resin compsn. having excellent moldability and mechanical properties at welded parts, by blending an AES resin with a mixture of a polycarbonate resin and a satd. polyester resin. CONSTITUTION:20-30pts.wt. AES resin is blended with 100pts.wt. compsn. consisting of a polycarbonate resin and a satd. polyester resin. A preferred weight ratio of said polycarbonate resin to said polyester resin is 3:97-97:3 from the viewpoints of dimensional accuracy, processability and weld strength. Said AES resins are those composed of 100-5wt% graft polymer obtd. by polymerizing an arom. vinyl compd. and a vinyl cyanide compd. in the presence of an ethylene/propylene rubbery copolymer and 0-95wt% copolymer obtd. by polymerizing an arom. vinyl compd. and a vinyl cyanide compd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermoplastic resin composition that is crushable in molding processability and has excellent mechanical properties, particularly mechanical properties of the wold part.

Polycarbonate resin is widely known as an engineering plastic with excellent impact resistance and heat resistance, but its high melt viscosity causes molding problems.In addition, saturated polyesters such as polyethylene terephthalate Resin is also widely known as an engineering plastic with excellent chemical and heat resistance, but due to its high crystallinity, dimensional accuracy is poor, and the high temperature dependence of melt viscosity causes molding problems. In order to solve these problems in molding, there have been proposals to mix polycarbonate resin and saturated polyester resin (Japanese Patent Publication No. 36-14035), and to add a butadiene-based graft polymer to these mixtures. 9 composition (Japanese Patent Publication No. 49-41442) and a composition containing an acrylate rubber-like polymer (Japanese Patent Publication No. 52-129246).
) have been proposed, but in all of them, the strength of the so-called weld part, which is the part where the resin flow intersects in the mold during injection bottom molding, is low and is insufficient from a practical standpoint as an injection molding material.几.

The inventors of the present invention have arrived at the present invention as a result of intensive research into compositions that have excellent moldability and weld strength, which is important as an injection molding material. AES per 100 parts of composition
The present invention is intended to provide a thermoplastic resin composition which contains 11 to 30 degrees of fat and has excellent processability and weld strength.

Next, the thermoplastic resin composition of the present invention will be explained in more detail.

The polycarbonate resin used in the present invention includes aromatic polycarbonate, aliphatic polycarbonate, and aliphatic polycarbonate.
Aromatic polycarbonates and the like can be mentioned. Generally, 2,2-bis(4-oxyphenyl)alkanes, bis(4-oxyphenyl)ethers, bis(4-oxyphenyl)
-oxyphenyl) sulfone, sulfide, or a polymer consisting of bisphenols such as nitrous sulfoxide, or a coelectrolytic polymer, and is substituted with a halogen depending on the purpose, and is an electrolytic polymer using a sphenol at-. The types and manufacturing method of polycarbonate resins are described in detail in "Polycarbonate Resin I" published by Nikkan Kogyo (September 30, 1964).

Examples of the Ogiwa polyester resin include polyethylene terephthalate, polytetramethylene terephthalate, polybutylene terephthalate, and polyester-ether block polymers having polyester hard segmentation and polyether soft segmentation. .4 Synthesized from butanediol, terephthalic acid, merui, ij dimethyl terephthalate, ethylene glycol, etc.

Furthermore, in the presence of the ethylene-propylene rubbery copolymer, at least two of the aromatic vinyl compounds, vinyl cyanide compounds, and other polymerizable polymeric compounds are selected. 100 to 5% by weight of graft polymer (C-1) obtained by polymerizing one or more compounds, respectively, and at least two of aromatic vinyl compounds, vinyl cyanide compounds, and other 1-polymer compounds: 19 Copolymer (C-2) obtained by polymerizing one or more compounds of each type
It is coated with a resin consisting of 5% by weight of 0 to 9゛.

The ethylene-propylene rubbery copolymers that make up the AESfIi fat include a binary copolymer of ethylene and propylene (EPR), a ternary copolymer of ethylene, propylene, and a non-conjugated diene (EPDM), etc. Yes, - stock mayu is used more than once.

Examples of the non-conjugated diene in the terpolymer (EPDM) include dicyclopentadiene, engineered norbornene, 1,4-hexadiene, 1.4-cyclotadiene, and 1.5-cyclooctadiene. Can be mentioned.

Binary copolymers (EPR) and terpolymers (EPDM)
) is preferably in the range of 5:1 to 1=3.

Further, in the ternary-monomer combination (EPDM), it is preferable that the proportion of non-conjugated diene is in the range of 2 to 50 in terms of iodine number.

Aromatic vinyl compounds constituting the graft polymer and copolymer include styrene, α-methylstyrene, α-
Examples include chlorostyrene and vinyltoluene, with styrene being particularly preferred. As vinyl cyanide compounds,
Examples include acrylonitrile and methacrylonitrile, with acrylonitrile being particularly preferred. Other polymerizable monomer compounds include methyl, ethyl, propyl,
Examples include acrylic ester compounds such as butyl, benzyl, and hexyl, and methacrylic ester compounds, with methyl methacrylate being particularly preferred.

In the graft polymer (C-1) VC, one or more compounds selected from at least two of the above-mentioned aromatic vinyl compounds, vinyl cyanide compounds, and other polymerizable monomer compounds are used.

Further, the Xt ratio between these compounds and the rubber in the graft polymer (C-1)ic can be selected within an appropriate range depending on the purpose. Usually 5 to 70 grams of rubber to 95 to 30"Xt% of compound.

In the copolymer (C-2), an aromatic vinyl compound,
Vinyl cyanide compound and one or more compounds selected from at least two of other polymerizable monomer compounds are used. AES resin can be produced by solution polymerization, bulk polymerization, suspension polymerization,
It is manufactured by a known method such as an emulsion method.

The weight ratio of polycarbonate resin and saturated polyester resin in the present invention is not particularly limited, but is 3:97 to 9.
It is preferable that the ratio is 7:3 from the viewpoint of dimensional accuracy, processability and weld strength of the thermoplastic resin composition of the present invention. If the amount of fat is less than 1 part of 0201i, which is 20 to 300 parts by weight, the processability and weld strength will be poor, which is not preferable. Also, 3
00] If the amount exceeds 1 part of 1i, the heat distortion temperature will decrease and the weld strength will also decrease.0 Thermoplastic resin composition of the present invention 9J1t! As a method for R-manufacturing, a known Banbury mixer-single-screw extruder, a twin-screw extruder having a cross-wire block, etc. can be applied. Furthermore, various additives such as dyes and pigments, stabilizers, lubricants, plasticizers, fillers, flame retardants, etc. can be added as necessary.

The present invention will be specifically described below with reference to Examples, but the present invention is not limited thereto.Based on the composition ratio shown in Example Table-1, polycarbonate resin,
The saturated polyester resin AESlf resin was kneaded in a single-screw extruder (temperature set at 250°C) to form compositions (sample numbers 1 to 3).
9 and create fc.

The obtained composition was manufactured using a Jusoku 15-10B injection molding machine to form test pieces for measuring various physical properties. The test results are shown in 2-1. In addition, the polycarbonate resin used was saturated polyester fM resin AESmJJ! U as follows 0 [Polycarbonate resin] Commercially available polycarbonate resin Nino (Nrite L-125)
0W (manufactured by Teijin Chemicals) [Saturated polyester resin] 0 Polyethylene terephthalate (PET): RY-56
0 (manufactured by Toyobo Co., Ltd.) 0 Polybutylene terephthalate (PBT): Toughpet PBTN-1000 (manufactured by Toyobo Co., Ltd.) 0 Polyester-ether block polymer (PEEB)
): HYTREL7246 (manufactured by Dubont) CAES
Resin] 48wt% of the graft polymer and 52xt% of the copolymer obtained by the following method were kneaded in a Banbury mixer, and A
KS resin was obtained.

<Production of graft polymer Kushu> Iodine value 8.5, Mooney viscosity 61, propylene content 43 wt%, EPDM containing ethylidene norbornene as diene component 370 parts by weight f n -hexane 300
0 parts by weight was dissolved in 1500 mt parts of ethylene dichloride, 250 parts by weight of styrene, 130 parts by weight of acrylonitrile and 13 parts by weight of benzoyl peroxide were added, and the mixture was heated at 67°C.
Boil in a nitrogen atmosphere for 10 hours. The polymerization solution was brought into contact with a large excess of methanol, and the precipitate was separated and dried to produce a graft polymer (rubber content: about 49%).

<Copolymer (uniform)> Styrene 70% by weight and acrylonitrile 30% by weight
0.1 parts by weight of t-dodecylmercaptan and 0.3 parts by weight of benzoyl peroxide were added to 11 parts of a mixed solution of 1001 [1001], and polymerization was carried out in an aqueous dispersion system by raising the temperature from 30°C to 90°C for 10 hours. Copolymer after dehydration (intrinsic viscosity o, s
O) I got k.

(1) Weld strength: Two gates with gate spacing of 100 m (2.5 x 2,0 m each)
Simplified) ↓ Injected bath melted resin (260'C), test piece with 3 thicknesses and 150 strips each in length and width? create.

Test piece top jig (height 80W1 inner diameter 120m, outer diameter 126
Place it on top of m).

A 1kl steel ball is dropped onto the center of the test piece in a low-temperature chamber adjusted to -30°C, and the maximum energy value (T/B) at which the test piece does not break is determined.

(II) Notched Izot impact strength ASTM D
-250/, 23℃ 011) Heating deformation temperature A8TM D-648 (264pai) No annealing V) Enhanced workability flow 230℃, 60 to 9/cdl Patent applicant Sumitomo Naugatuck Co., Ltd.

Claims (1)

[Claims] 1) Per 100 parts by weight of a composition consisting of (A) polycarbonate resin and (B) saturated polyester resin, (C)
AES111J120~300111ftlS combination t,
A thermoplastic resin composition with excellent processability and queld strength. 2) Claim @1 in which the weight ratio of polycarbonate a fat and saturated polyester resin is 3=97 to 97:3
Thermoplastic resin composition Oa) AE S flii Aromatic vinyl compound, vinyl cyanide compound and other polymerizable polymer compounds in the presence of a fatty catelene-propylene rubbery copolymer. Graft polymer (C-1) 10 obtained by polymerizing one or more compounds each selected from at least two
A co-polymer obtained by enriching 0 to 5 tS and at least two selected compounds from aromatic vinyl compounds, vinyl cyanide compounds, and other polymerizable monomer compounds, and one or more of each of Jt). (C-2) The thermoplastic resin composition according to claim 2, wherein the composition is comprised of 0 to 95 t% by weight. 4) The thermoplastic resin composition according to claim 1, 2 or 3, wherein the saturated polyester resin is a polyalkylene terephthalate resin.