JPS60250060A - Polycarbonate resin composition - Google Patents

Abstract

PURPOSE:To provide the titled resin compsn. having improved moldability, resistance to solvents and low-temperature impact, by blending a polycarbonate resin, an ABS resin and butyl rubber in a specified ratio. CONSTITUTION:20-200pts.wt. acrylonitrile/butadiene/styrene copolymer resin (e.g. ABS-10, a product of Nippon Gosei Gomu K.K.) and 0.5-7pts.wt. butyl rubber (e.g. IIR-065, a product of Nippon Gosei Gomu K.K.) are mixed with 100pts. wt. polycarbonate resin (e.g. Panlite L-1225, a product of Teijin Kasei K.K.). The mixture is melt-kneaded in an extruder or a kneader to obtain the desired polycarbonate resin compsn.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polycarbonate resin composition, and more particularly to a polycarbonate resin composition with improved solvent resistance, impact resistance at low temperatures, and moldability.

Conventional technology Polycarbonate resin has a high degree of shock resistance, is self-extinguishing, has higher heat resistance than other resins, and has excellent electrical properties and dimensional stability. It is widely known as an engineering plastic.

In addition, the thickness dependence of polycarbonate resin moldability and impact strength was improved using polycarbonate resin and ABS resin (
Acrylic, -nitrile-diene rubber-styrene polymer mixture) Official Gazette, 41 Kaisho 53-
7757, Japanese Patent Application Laid-Open No. 130749/1983) are also well known.

Automobile bumpers, panels, and spoilers.

Exterior parts such as door handles have traditionally been made of steel, but with recent advances in fuel efficiency and weight reduction, there is a growing demand for plastics. Additionally, the advantages of plastic, such as its corrosion resistance and resistance to denting, are being reconsidered compared to steel.

As plastics used for such automobile parts, attention has been focused on impact resistance, heat resistance, moldability, and mixtures of the above-mentioned polycarbonate resins and ABS resins. However, when polycarbonate a resin-ABS resin mixtures are used for automobile parts and the like, their low solvent resistance is a major problem. As a method to improve this drawback, a method of adding a polyamide resin to the above mixture is disclosed in Japanese Patent Application Laid-Open No. 56-18.
It is disclosed in Japanese Patent No. 647. However, although this method improves solvent resistance, it is not satisfactory (and also has the disadvantage that impact strength decreases at low temperatures).

OBJECTS OF THE INVENTION An object of the present invention is to provide a polycarbonate resin composition having improved resistance to solvents such as high octane gasoline, 1/4 inch Fizot impact strength, low temperature impact strength and moldability. be.

Structure of the invention The present invention consists of 100 parts by weight of polycarbonate resin (4), A
BS resin Q3) 20 to 200 parts by weight and 0 butyl rubber
The present invention relates to a polycarbonate resin composition containing 0.5 to 7 parts by weight.

The polycarbonate resin (4) used in the present invention is usually prepared by reacting dihydric phenol with a carbonate precursor such as phosgene in the presence of an acid acceptor and a molecular weight regulator, or by reacting dihydric phenol with a carbonate precursor such as diphenyl carbonate. It is produced by transesterification reaction with As the dihydric phenol that can be used here, bisphenol is preferable, particularly 2,2-bis(4-hydroxyphenyl)propane (hereinafter referred to as bisphenol A).
It is preferable.

Further, part or all of bisphenol A may be replaced with other dihydric phenol. 2 other than bisphenol A
Examples of the hydric phenol include hydroquinone, 4.4
'-dihydroxydiphenyl, bis(4-hydroxyphenyl)alkane, bis(4-hydroxyphenyl)dicloflucan, bis(4-hydroxyphenyl)sulfite, bis(4-hydroxyphenyl)sulfone, bis(4-hydroxydiphenyl)sulfoxide ,Screw(
Compounds such as 4-hydroxyphenyl) ether or bis(3,5-dibromo-4-hydroxyphenyl)
Examples include halogenated bisphenols such as propane.

Polycarbonate resin is a homopolymer of these dihydric phenols or 21! The above copolymers or blends thereof may be used. Further, the polycarbonate resin may be partially branched (for example, it may be a thermoplastic randomly branched polycarbonate made by reacting a polyfunctional aromatic compound with a dihydric phenol carbonate precursor).

The ABS@fat (6) used in the present invention 11 may be a commercially available one, and its blending amount is 20 to 200 parts by weight, preferably 30 to 170 parts by weight, per 100 parts by weight of the polycarbonate resin. . If the blending amount is less than the above range, the resin composition of the present invention will not have the same solvent resistance.

Impact resistance at low temperatures cannot be obtained, and if the amount is too high, the heat resistance, which is a feature of polycarbonate resin, will be significantly reduced.

The butyl rubber used in the present invention may be any commercially available one, and its blending amount is 10% of the polycarbonate resin.
0.5 to 7 parts by weight, preferably 1 to 7 parts by weight
5 parts by weight. If the amount is less than the above-mentioned range, it will not be possible to obtain the solvent resistance of the resin composition of the present invention, and if it is more, layer peeling will occur and the appearance of the molded product will be impaired.

The polycarbonate resin composition of the present invention can be prepared by any method. For example, polycarbonate resin (
Add ABS resin (b) and butyl rubber CC) to 6) and use a V-type blender.

A method of mixing using a super mixer etc. and then melt-mixing using an extruder at Konida Go, a method of mixing components (G) and (Q) in advance with a mixer in a pant milli mixer,
There is a method of mixing this with polycarbonate resin in a molten state.

The composition of the present invention may also contain a reinforcing agent such as glass fiber, a heat stabilizer, an antioxidant, a blowing agent, a light stabilizer, a flame retardant, and a plasticizer, depending on its use.

A mold release agent, an antistatic agent, a dye, etc. can be added.

Effects of the Invention The polycarbonate resin composition of the present invention has greatly improved solvent resistance, and has excellent impact strength and moldability at low temperatures, so it can be used as a bumper.

Can be used for automotive exterior parts such as panels, fenders, spoilers, and door handles.

EXAMPLES The present invention will be further explained with reference to Examples below. In addition,
Solvent resistance, impact resistance, and impact resistance at low temperatures were evaluated using the following methods.

1. Solvent resistance evaluation method I) Bending strength retention in gasoline Using an injection molding machine, pre-dried pellets were molded into 127 fins x 12.7 m x 6.35 wx.
It was molded into a bending test piece. The bending test pieces were processed at a temperature of 23°C and a humidity of 50% for 24 hours, then tested using a tensile tester (Shinko).
made; TOM500D type) Ic bending strength a at 23℃
) was measured. In addition, the temperature of the bending test piece was 23°C.

After processing at 50% humidity, it was immersed in gasoline (Maruzen Oil Regular Gasoline) for 15 seconds, and the bending strength b) was measured in the same manner as above. Solvent resistance is strength retention rate (o) = ((b)/(a))xtoo
Rated K. The higher the retention rate, the better the solvent resistance.

II) Crack occurrence time in solvent A tensile test piece (ASTM D-638° type dumbbell) K was molded using a pellet injection molding machine that had been dried in advance. This tensile test piece is a stainless steel material with a width of 30mm, a thickness of 1o, and a length of 250mm.
The specimens were attached to most of the bent tools and immersed in a 1:1 mixture of isooctane and toluene instead of various high-octane gasolines to create a time period until the specimens cracked. The longer the crack generation time, the greater the solvent resistance.

2. Impact resistance evaluation method Using an injection molding machine, pre-dried pellets were molded into 64mm
X12.7 fins X3.18m and 64■X 12.7mX
It was molded into a 6.35 inch impact test piece. The test piece is 0.2
After attaching the 5WR notch, the temperature was 23℃ and the humidity was 50%.
It was treated for 24 hours. Thereafter, the impact strength was measured using a Fizot impact tester K (manufactured by Toyo Seiki ■). The higher the impact strength, the better the impact resistance.

3. Impact resistance at low temperatures The notched impact test piece formed in 2 above was left in a -30°C incubator for 1 hour, then taken out of the incubator and immediately subjected to impact testing using the Fizot impact tester in 2 above. The strength was measured.

The higher the impact strength, the better the impact resistance at low temperatures.

Examples 1 to 4 and Comparative Examples 1 to 3 Pre-dried polycarbonate resin (2) (Teijinka Hat 1
Panlight L-1225) ABSI shown in Table 1
l fat and butyl rubber (Japanese Synthetic Rubber #: IIR-06
5) First! ! The mixture was mixed using a C-VU printer, and then extruded into pellets using a 30 mm extruder (Chuo Machinery ■$1!: VSK-30). Using the obtained pellet, a test piece was injection molded by the method shown in the evaluation method above, and its solvent resistance, impact resistance, and impact resistance at low temperatures were evaluated. # the result! It is shown in Table 1.

Procedural amendment dated September 6, 1980, Commissioner of the Japan Patent Office 1, Indication of the case, Patent Application No. 1983-106360, 2, Title of the invention: Polycarbonate resin composition 3, Person making the amendment Relationship to the case Representative of the patent applicant Yoshiki Yamazaki 5, "Detailed Description of the Invention" column 6 of the specification to be amended, contents of the amendment (1) In the bottom line of the second page of the specification, the phrase "formability strength is one or more" has been changed to " The above is corrected from the viewpoint of formability.

(2) On page 5, line 3, the text "[0-oxydiphenyl)" has been corrected to "O-oxyphenyl)."

(3) In the 14th line of page 8, the phrase "pellet injection molding machine" is corrected to "pellet injection molding machine".

that's all

Claims (1)

[Claims] A polycarbonate resin composition consisting of 100 parts by weight of a polycarbonate resin, 20 to 200 parts by weight of an acrylonitrile loosetadiene-styrene copolymer resin, and 00.5 to 7 parts by weight of butyl rubber.