JPS60127350A - Thermoplastic resin composition - Google Patents

Abstract

PURPOSE:To provide the titled three-component composition having excellent flexural strength, flexural modulus, chemical resistance, appearance and moldability, and composed of an aromatic polycarbonate resin, an aromatic saturated polyester resin and a specific polyester elastomer. CONSTITUTION:The objective resin composition is produced by compounding (A) 65-90(wt)% aromatic polycarbonate resin (preferably made from bisphenol A) with (B) 8-30% aromatic saturated polyester resin (e.g. PET, polytetramethylene terephthalate, etc.) and (C) 1-25% polyester elastomer produced by the polycondensation of (i) a dicarboxylic acid containing >=70mol% terephthalic acid or its ester-forming derivative (hereinafter called as derivative), (ii) a low molecular weight glycol containing >=70mol% tetramethylene glycol or its derivative and (iii) a poly(oxyalkylene) glycol having an average molecular weight of 500-5,000, preferably poly(tetramethylene oxide) glycol or its derivative. The amount of the component (iii) in the component (C) is 10-50wt%.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermoplastic resin composition that exhibits various mechanical properties, particularly excellent bending strength and flexural modulus, chemical resistance and appearance, as well as good moldability. For ^, aromatic polycarbonate resin 6p~90@t%.

B, aromatic saturated polyester resin 8-30 wt% and C, polyester elastomer 1-25%,
The polyester elastomer C contains (1) a dicarboxylic acid containing 70 mol% or more of terephthalic acid or an ester-forming derivative thereof, (2) 70% of tetramethylene glycol.
In the polyester elastomer, component (3) contains a low molecular weight glycol or an ester-forming derivative thereof containing 0 mol% or more, and (3) a poly(oxyalkylene) glycol or an ester-forming derivative thereof having an average molecular weight of 500 to 5,000. 10～
As is well known for thermoplastic resin compositions characterized by being formed by polycondensation at a ratio of 501 t%,
Aromatic polycarbonate resins are tough, impact resistant, have excellent electrical properties, and have good dimensional stability, so they are widely used as useful engineering plastics. However, there are problems such as high melt viscosity and poor moldability, problems with chemical resistance such as cranking when it comes into contact with aromatic organic solvents or gasoline, and insufficient bending strength and flexural modulus. As a result, its scope of application is actually limited.

In order to improve these drawbacks, proposals have been made to blend various resins with aromatic carbonate resins. For example, Japanese Patent Publication No. 40-17663 teaches blending polyolefins, and Japanese Patent Publication No. 40-24191 teaches blending ethylene-propylene copolymers, which have improved moldability and impact resistance. However, a decrease in flexural strength and flexural modulus was observed, as well as a decrease in surface hardness.

Japanese Patent Publication No. 36-14035 proposes blending aromatic polyester resin with aromatic polycarbonate resin to improve solvent resistance, but this results in lower surface hardness and improved bending strength and flexural modulus. It has not been.

The present inventors have improved the moldability and chemical resistance of aromatic polycarbonate resin, especially the bending strength in tetrachloride, as well as other mechanical properties such as bending strength and flexural modulus, and surface hardness. The present inventors have discovered a ternary thermoplastic resin composition that has well-balanced properties such as appearance, and have completed the present invention.

The present invention will be explained in detail below.

The aromatic polycarbonate resin of the present invention is an optionally branched thermoplastic polycarbonate polymer made by reacting an aromatic dihydroxy or a small amount of a polyhydroxy compound with a diester of phosgene or carbonic acid. An example of an aromatic dihydroxy compound is
2.2-bis(4-hydroxyphenyl)propane (bisphenol A), tetramethylbisphenol A1 tetrabromobisphenol A1 bis(4-hydroxyphenyl)-P-diisopropylbenzene, hydroquinone, resorcinol, 4.4-dihydroxydiphenyl, etc. In particular, bisphenol A is preferred. In addition, in order to obtain a branched aromatic polycarbonate resin, phloroglucin, 4,6-dimethyl-2.4.6-1-li(4-hydroxyphenyl)hebutene-2,4,6-
Dimethy/L/-2,4,6-tri(4-hydroxyphenyl)hebutane, 2,6-dimethyl-2.4.6-
tri(4-hydroxyphenyl)hebutene-3,4,
Examples include 6-dimethyl-2.4.6-tri(4-hydroxyphenyl)hebutane, 1゜3,δ-tri(4-hydroxyphenyl)benzene, 1,Ll-tri(4-hydroxyphenyl)ethane, etc. polyhydroxy compounds, and 3゜3-bis(4-hydroxyaryl)
Oxindole (= isatin bisphenol), 5-
Chlorisatin, 5,7-dichloroisatin, 5-bromiisatin, etc. are substituted with a polyhydroxy compound for a portion of the dihydroxy compound, for example 0.2 to 2 mol %. Furthermore, monoaromatic hydroxy compounds suitable for controlling the molecular weight include m- and p-methylphenol, tri- and p-propylphenol, p-bromophenol, p-bromophenol, p-
-tertbutylphenol and p-long chain alkyl-substituted phenols are preferred. Typical examples of aromatic polycarbonate resins include polycarbonates based on bis(4-hydroxyphenyl)alkane dihydroxy compounds, particularly bisphenol A, and polycarbonates obtained by using 2M or more aromatic dihydroxy compounds in combination. Branched polycarbonates obtained by using a small amount of copolymers and trivalent phenol compounds can also be mentioned. Aromatic polycarbonate resins may be used as a mixture of two or more types.

The aromatic saturated polyester resin used in the present invention is
It is a polymer obtained by reacting aromatic dicarboxylic acid or its diester with glycol or alkylene oxide by a known method. Specifically, it is a polymer obtained by reacting aromatic dicarboxylic acid or its diester with glycol or alkylene oxide, and specifically, the main component is terephthalic acid or dimethyl terephthalate. Examples include polyethylene terephthalate and polytetramethylene terephthalate obtained by reacting this with ethylene glycol, butanediol, ethylene oxide, or the like. The aromatic saturated polyester resin may be a copolymer or may be used in the form of a mixture of two or more types. The aromatic saturated polyester resin used in the present invention has an intrinsic viscosity (intrinsic viscosity) of 1.0 or more, usually 1.0 or more, as measured at 30°C in a mixed solvent of phenol and tetrachloroethylene in a weight ratio of 6:4. 0
It is preferable to have a value of ~1.5, and if it is less than 1.0, the impact strength and chemical resistance will be insufficiently improved.

In the present invention, the above-mentioned C, polyester elastomer is blended into the resin composition of the above red aromatic polycarbonate resin and B, aromatic saturated polyester resin. Here, the polyester elastomer contains (11 terephthalic acid and 70
dicarboxylic acid or its ester-forming derivative containing mol% or more, (2) low molecular weight glycol or its ester-forming derivative containing 70 mol% or more of tetramethylene glycol, and (3) average molecular weight 500 to s, oo
.

It is a copolymer obtained by polycondensing poly(oxyalkylene)glycol or its ester-forming derivative in a proportion that component (3) is 10 to 50-t% of the polyester elastomer.

Here, as the dicarboxylic acid containing 70 mol% or more of terephthalic acid or its ester-forming derivative (11), those used as a dicarboxylic acid component other than terephthalic acid include aliphatic, alicyclic, and aromatic. Generally, the molecular weight is 300 or less, and examples thereof include adipic acid, sepathic acid, cyclohexyldicarboxylic acid, isophthalic acid, naphthalene dicarboxylic acid, etc. In addition, as the glycol in (2), the above-mentioned B component The poly(oxyalkylene) glycol of (3) has an average molecular weight of 50.
0 to 5,000, and the number ratio of carbon atoms to oxygen atoms contained in this glycol is preferably 2.0 to 4.3. For example, poly(tetramethylene oxide) glycol, poly(ethylene oxide) Examples include glycol, poly(propylene oxide) glycol, and copolymers thereof, and poly(tetramethylene oxide) glycol is particularly preferred.

In the polycondensation of [11, (2) and (3) above], component (3) in the polyester elastomer obtained is 10 to 50%.
-t%, preferably 15 to 30-1%.

Further, the degree of polymerization of the polyester elastomer is preferably such that the reduced viscosity of a solution with a concentration of 1.2 g/c11 of chlorophenol at 35° C. is in the range of 0.5 to 5.0. As such a polyester elastomer, one commercially available from Toyobo Co., Ltd. under the trade name Pelprene P280BJ is suitably used.

To the above in the thermoplastic resin composition of the present invention.

Aromatic polycarbonate resin is 65 to 90 ivt%, B
, aromatic saturated polyester resin 8-30 wt% and C
, polyester elastomer ranges from 1 to 25-t%. If the aromatic polycarbonate resin is less than 65wt%, the heat resistance will not reach the level required for engineering plastics, and the dimensional stability will be poor.
%, the improvement in moldability will be insufficient and the chemical resistance will also be insufficient. Aromatic saturated polyester resin thermal property is 811t%.

If the amount is less, the improvement of chemical resistance will be insufficient, and 3
If it exceeds 0 wt%, it causes poor dimensional stability. Furthermore, if the polyester elastomer C8 is less than 1 wt%,
Improvements in flexural modulus, chemical resistance, and surface hardness were not achieved;
If it exceeds 25 wt%, it causes poor heat resistance.

The thermoplastic resin composition of the present invention as described above includes
Various additives such as stabilizers, pigments, dyes, flame retardants, and lubricants, reinforcing materials such as inorganic or organic fiber substances, and various fillers such as glass beads can be added as desired.
Furthermore, other resin components may be blended within a range that does not impair the characteristics of the present invention. For example, polycarbonate from bisphenol A or tetrabromobisphenol A.
Examples include adding oligomers to improve moldability, flammability, and surface properties, and adding heat-resistant polyesters such as polyester carbonate and polyarylate (for example, product name: U Polymer, Unitika ■) to improve heat resistance. .

In preparing the thermoplastic resin composition of the present invention,
Any conventionally known method may be used, and methods of kneading using an extruder, Banbury mixer, rolls, etc. may be selected as appropriate.

This will be explained below using Examples and Comparative Examples, but [%]
and "molecular weight" are based on weight unless otherwise specified.

Examples 1 to 5 and Comparative Examples 1 to 5 Aromatic polycarbonate resin made from bisphenol A (manufactured by Mitsubishi Gas Chemical Co., Ltd., trade name Newpiron S-2000, molecular weight 2
5,000), polyethylene terephthalate (manufactured by Toyobo ■, trade name: UNIPET RT-580, intrinsic viscosity 1,2 at 30°C, in a mixed solvent of phenol/tetrachlorethylene-6/4I ratio) and polyester elastomer (manufactured by Toyobo ■, product name: UNIPET RT-580, intrinsic viscosity 1,2 at 30°C, in a mixed solvent of phenol/tetrachloroethylene-6/4I ratio) ■Made by, product name: Perbrene P-2
80B) in the proportion shown in Table 1 in a blender, and
Mixed for 0 minutes.

The obtained mixture was supplied to a 400 vented extruder and melt-kneaded at a cylinder temperature of 260° C. to form f pellets.

After drying the pellets in a hot air dryer at 120° C. for 5 hours or more, test pieces for measuring physical properties were molded by injection molding.

For comparison, aromatic polycarbonate single-striped (Comparative Example-1), compositions of aromatic polycarbonate resin and polyester elastomer (Comparative Examples-2 & 3), and compositions of aromatic polycarbonate resin and polyethylene terephthalate (Comparative Examples-2 & 3) were prepared. The physical properties of Comparative Examples 4 & 5) were measured in the same manner as in the Examples.

The results are shown in Table 1.

Examples 6 to 8 In Examples 1 to 5, polytetramethylene terephthalate (manufactured by Toyobo ■, trade name: Toughpet N-1200, intrinsic viscosity 1.
2 at 30°C, in a mixed solvent of 5/4 wt ratio of pheno-J/tetrachlorethylene) were used, and the same resin components were used, mixed in the proportions shown in Table 1, and placed in the cylinder of a vented extruder. A test piece for measuring physical properties was molded in the same manner except that the temperature was 250°C. Measurement results first
Shown in the table.

Examples 9 to 11 The resin components used in Examples 1 to 8 were mixed in the proportions shown in Table 1, and test pieces for measuring physical properties were molded in the same manner as Examples 6 to 8. Physical properties were measured. The results are shown in Table 1.

Procedural amendment stamp button January 22, 1985 1. Indication of the case 1988 Patent Application No. 211400 2. Name of the invention Thermoplastic resin composition 3. Person making the amendment Relationship to the case (patent applicant) 4. Subject of amendment 5. The following amendments will be made to the "Detailed description of the invention" column of the statement of contents of the amendment.

■Correct "resin heat" in line 6 of page 10 to "resin ga".

that's all

Claims (1)

[Claims] 8. Aromatic polycarbonate resin 65 to 90 wt% B
, aromatic saturated polyester resin 8 to 3 (hrt%) and C, polyester elastomer 1 to 25 wt%, and the polyester elastomer C contains (11 dicarboxylic acid containing 70 mol% or more of terephthalic acid or an ester-forming derivative thereof, (2) a low molecular weight glycol or an ester-forming derivative thereof containing 70 mol% or more of tetramethylene glycol, and (3) a poly(oxyalkylene) glycol having an average molecular weight of 500 to 5.000 or an ester-forming derivative thereof as a component ( 3) is 10 to 50 in the polyester elastomer
A thermoplastic resin composition characterized in that it is formed by polycondensation at a ratio of 4t%.