JPH0768445B2 - Aromatic polycarbonate resin composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to an aromatic polycarbonate resin composition with improved moldability. Specifically, by blending an aromatic polycarbonate resin with a specific bisphenol compound, the original excellent heat resistance, impact resistance, and transparency can be maintained without deterioration of the resin, and molding can be performed with improved fluidity. The present invention relates to a resin composition having remarkably improved processability. The resin composition can be processed by a processing method usually used for thermoplastic resins such as injection molding, extrusion molding and blow molding, and by utilizing its excellent characteristics, electric / electronic parts, automobile parts, mechanical parts, It can be used in a wide range of fields such as household products.

[Conventional technology and its problems]

Although the aromatic polycarbonate resin has excellent properties such as heat resistance and impact resistance, it requires high temperature and high pressure at the time of molding, is difficult to separate from the mold, and is poor in moldability.

Therefore, it has been desired to improve the molding processability of the aromatic polycarbonate resin.

However, although the mold release agent generally used in the past can improve the separation from the mold, it cannot reduce the high temperature and high pressure required for the molding process.

Further, aliphatic esters of phthalic acid such as dioctyl phthalate and dibutyl phthalate, which are commonly used as plasticizers in other resins, and tricresyl phosphate, phosphoric acid esters such as diphenyl cresyl phosphate, etc.,
It lacks affinity with aromatic polycarbonate and significantly reduces mechanical and thermal properties.

For this reason, it has been the actual situation that a method for greatly improving the molding processability without impairing the excellent properties of the aromatic polycarbonate has not been found industrially.

[Means for solving problems]

The present inventors have conducted extensive studies to improve the molding processability of an aromatic polycarbonate resin, and as a result, by compounding a specific bisphenol-based compound, the molding processability is remarkably improved, and the aromatic polycarbonate is further improved. The present invention has been accomplished by finding the fact that the excellent characteristics of No. 1) are hardly deteriorated and the deterioration of the polymer is little.

That is, the gist of the present invention is an aromatic polycarbonate resin.
With respect to 100 parts by weight, [A] an ester compound of a bisphenol and an aliphatic carboxylic acid having 2 to 36 carbon atoms and / or an ester of an alkylene oxide modified product of bisphenol and an aliphatic carboxylic acid having 2 to 36 carbon atoms The aromatic polycarbonate resin composition comprises 1 to 10 parts by weight of the compound and 0 to 50 parts by weight of [B] glass fiber.

[Structure of Invention]

 Hereinafter, the present invention will be specifically described.

The aromatic polycarbonate resin used in the present invention is a polymer obtained by a phosgene method in which various dihydroxydiaryl compounds are reacted with phosgene, or a transesterification method in which a dihydroxydiaryl compound is reacted with a carbonic acid ester such as diphenyl carbonate. A typical example of the copolymer is a polycarbonate resin produced from 2,2-bis (4-hydroxyphenyl) propane (bisphenol A).

Examples of the dihydroxydiaryl compound include bisphenol A, bis (4-hydroxyphenyl) methane, 1,1-bis (4-hydroxyphenyl) ethane and 2,2
-Bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxyphenyl) octane, bis (4-hydroxyphenyl) phenylmethane, 2,2-bis (4-hydroxy-3-methylphenyl) propane, 1,1-bis (4-hydroxy-3-tert-butylphenyl) propane, 2,2-bis (4-hydroxy-3-bromophenyl) propane, 2,2-bis (4-hydroxy-3,5dibromo) Phenyl) propane, 2,2-bis (4-hydroxy-
Bis (hydroxyaryl) alkanes such as 3,5 dichlorophenyl) propane, bis (hydroxyaryl) such as 1,1-bis (4-hydroxyphenyl) cyclopentane and 1,1-bis (4-hydroxyphenyl) cyclohexane ) Dihydroxy diaryl ethers such as cycloalkanes, 4,4'-dihydroxydiphenyl ether, 4,4'-dihydroxy-3,3'-dimethyldiphenyl ether, 4,4'-dihydroxydiphenyl sulfide, 4,4'- Dihydroxydiaryl sulfides such as dihydroxy-3,3′-dimethyldiphenyl sulfide, 4,4′-dihydroxydiphenyl sulfoxide, dihydroxydiaryl sulfoxides such as 4,4′-dihydroxy-3,3′-dimethyldiphenyl sulfoxide, 4,4'-dihydroxydipheny Sulfone, 4,
Examples include dihydroxydiarylsulfonic acids such as 4'-dihydroxy-3,3'-dimethyldiphenyl sulfone.

These may be used alone or in combination of two or more,
In addition to these, piperazine, dipiperidyl, hydroquinone, resorcin, 4,4'-dihydroxydiphenyl and the like may be mixed and used.

As the ester compound of the bisphenol and the aliphatic carboxylic acid having 2 to 36 carbon atoms in the present invention, bisphenols used include bisphenol A, tetrabromobisphenol A, bisphenol F, bisphenol C, tetramethyl-bisphenol A, Tetramethyl-bisphenol F, di-isopropyl-bisphenol A, di-sec-butyl-bisphenol A, tetra-t-butyl-bisphenol A, tetra-t-butyl-bisphenol F, 1,1-ethylidene-bisphenol, 1, 1-isobutylidene-bisphenol, methyl-
Examples include ethyl-methylene-bisphenol, methyl-isobutyl-methylene-bisphenol, methyl-hexyl-methylene-bisphenol, methyl-phenyl-methylene-bisphenol, O, P'-bisphenol A, and the like. Among them, bisphenol A is used as the bisphenol, and the general formula (R ₁ and R ₂ represent an aliphatic hydrocarbon group having 1 to 35 carbon atoms.) It is preferable to use a bisphenol compound.

Specific examples of the ester compound of an alkylene oxide-modified bisphenol with an aliphatic carboxylic acid having 2 to 36 carbon atoms include ethylene oxide, propylene oxide, tetrahydrofuran ethylene oxide, a propylene oxide mixture, ethylene oxide, and a tetrahydrofuran mixture in the bisphenol. , An ester compound of a compound obtained by adding a mixture of propylene oxide and tetrahydrofuran, and an aliphatic carboxylic acid having 2 to 36 carbon atoms is used.

Examples of the aliphatic carboxylic acid having 2 to 36 carbon atoms include lauric acid, stearic acid, behenic acid and montanic acid.

Among the above-mentioned bisphenol compounds, it is preferable to use an ester compound of an alkylene oxide-modified bisphenol compound and an aliphatic carboxylic acid, since the deterioration of the polycarbonate can be reduced.

The ester compound of the bisphenol and the aliphatic carboxylic acid of the present invention or the ester compound of the alkylene oxide modified product of the bisphenol and the aliphatic carboxylic acid is 1 to 10 parts by weight with respect to 100 parts by weight of the aromatic polycarbonate,
It is preferably blended in an amount of 1 to 5 parts by weight. If the compounding amount is small, the effect of improving the molding processability is insufficient, and if the compounding amount exceeds the above range, the mechanical properties and thermal properties inherent in the aromatic polycarbonate resin are significantly deteriorated.

The resin composition of the present invention becomes more useful by further incorporating glass fiber.

As the glass fiber used in the present invention, commercially available roping glass, chopped strand glass or milled glass can be used as the glass fiber for resin reinforcement, and those subjected to surface treatment for plastic reinforcement or sizing agent treatment are preferable.

The diameter of the glass fiber in the composition of the present invention is 0.005
.About.0.02 mm is preferable, and its length is preferably 0.01 to 10 mm.

The blending amount of glass fiber is selected in the range of 0 to 50 parts by weight with respect to 100 parts by weight of aromatic polycarbonate.

The resin composition of the present invention further comprises carbon fiber, glass beads,
Fillers such as glass flakes or antioxidants, flame retardants, antistatic agents, UV absorbers, carbon black,
You may contain additives, such as various coloring agents.

Further, other resins can be blended within a range that does not impair the characteristics of the present invention.

〔Example〕

Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited thereto without departing from the gist thereof.

Each physical property value was measured by the methods described below.

 Tensile strength It was measured according to ASTM D-638.

Heat distortion temperature According to ASTM D-648, the load was 18.6 kg / cm ² .

The amount of deformation after 100 hours was measured at a tensile creep temperature of 80 ° C. and a stress of 200 kg / cm ² or 400 kg / cm ² .

Examples 1 to 6 Bisphenol A type polycarbonate having an average molecular weight of 22,000 as an aromatic polycarbonate (manufactured by Mitsubishi Kasei Co., Ltd .;
A specific bisphenol compound of the present invention having a structural formula shown in Table 1 and a chopped glass fiber (Asahi Fiber Glass Co., Ltd.)
(Manufactured by MA486A) under the compounding ratio shown in Table 2. Next, using a single screw extruder with a cylinder diameter of 40 mmφ to melt and knead into pellets, and using an injection molding machine with a mold clamping force of 75 tons (Toshiba Machinery Co., Ltd., trade name IS75S), a resin temperature of 280 ° C. and a diameter of 50 mmφ , A mold having a cylindrical cavity with a height of 60 mm and a wall thickness of 3 mm was used.

At this time, the minimum cooling time during which the molded product was released from the mold without abnormality was measured. At the same time, the minimum injection pressure required to fill the cavity was measured.

Further, a test piece was formed, and the tensile strength, heat distortion temperature and tensile creep were measured. Various measurement results are shown in Table-2.

Comparative Examples 1-2 The same procedures as in Examples 1-6 were carried out except that the bisphenol compound of the present invention was not added.

Comparative Examples 3 to 4 Comparative Examples 3 to 4 were performed in the same manner as in Examples 1 to 6 except that dioctyl phthalate or tricresyl phosphate was added as a known plasticizer instead of the bisphenol compound.

Comparative Example 5 The procedure of Examples 1 to 6 was repeated, except that the bisphenol compound was blended at the blending ratio shown in Table 2.

[Effect of the Invention] The aromatic polycarbonate resin composition blended with the bisphenol compound used in the present invention has a low pressure during injection molding, has a good mold release property, and is remarkably improved in moldability. Further, the mechanical properties and the thermal properties are hardly deteriorated, and they are extremely superior to general plasticizers.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Yoshikazu Kurahara Inventor Yoshikazu Kurahara 370 Enzo, Chigasaki-shi, Kanagawa Mitsubishi Kasei Co., Ltd. Chigasaki Plant

Claims (1)

[Claims] 1. An ester compound of [A] bisphenol and an aliphatic carboxylic acid having 2 to 36 carbon atoms and / or an alkylene oxide modified product of bisphenol and 2 to 2 carbon atoms per 100 parts by weight of an aromatic polycarbonate resin. An aromatic polycarbonate resin composition comprising 1 to 10 parts by weight of 36 ester compounds with an aliphatic carboxylic acid and 0 to 50 parts by weight of [B] glass fiber.