JPS60127352A - Thermoplastic resin composition - Google Patents

Abstract

PURPOSE:To provide the titled three-component composition having excellent impact resistance, 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. 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), (ii) a low molecular weight glycol containing >=70mol% tetramethylene glycol (or its ester-forming derivative) and (iii) a poly(oxyalkylene) glycol (or its ester-forming derivative) having an average molecular weight of 500-5,000, preferably poly(tetramethylene oxide)glycol. The amount of the component (iii) in the component (C) is 70-90wt%.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermoplastic resin composition that exhibits various mechanical properties, particularly impact resistance, chemical resistance, and appearance, as well as good moldability. Aromatic polycarbonate resin 65-9ht%B, aromatic saturated polyester resin
8 to 30 wt% and C, 1 to 25 wt% of the polyester elastomer, and the polyester elastomer C contains (11 dicarboxylic acid containing 70 mol% or more of terephthalic acid or its ester-forming derivative, (2) tetramethylene A polyester elastomer in which component (3) is a low molecular weight glycol or an ester-forming derivative thereof containing 70 mol% or more of glycol, and (3) a poly(oxyalkylene) glycol or an ester-forming derivative thereof having an average molecular weight of 500 to 5.000. Medium 70-90
It is a thermoplastic resin composition characterized by being formed by polycondensation in a proportion of Due to its good stability, it is widely used as a useful engineering plastic. On the other hand, it has disadvantages such as high melt viscosity and poor moldability, thickness dependence of induction shock resistance, and poor chemical resistance such as cracking when it comes into contact with aromatic solvents or gasoline. For some reason,
The reality is that its application range is limited.

In order to improve these drawbacks, proposals have been made to blend various resins with aromatic polycarbonate resins. For example, Japanese Patent Publication No. 40-17663 discloses polyolefin, Japanese Patent Publication No. 40-24191 discloses ethylene-propylene copolymer, Japanese Patent Publication No. 15225-1977 describes AB
It has been taught to incorporate S resins, and although these improve moldability and impact resistance, the heat deformation temperature decreases, and chemical resistance may not be improved. In practical terms, the improvement cannot necessarily be said to be sufficient. Moreover, in Japanese Patent Publication No. 36-14035, an aromatic polyester resin is blended with an aromatic polycarbonate resin to produce 11 it.
Although there have been proposals to improve the solvent properties, these resins have poor compatibility (the resulting compositions have low impact resistance, and no improvement has been achieved in the thickness dependence of impact strength.

The present inventors have developed a resin composition that has well-balanced molding processability of aromatic polycarbonate resin as well as various mechanical properties, thermal properties, and chemical properties, and in particular, the thickness dependence of low-temperature impact resistance and impact strength. The inventors discovered a ternary thermoplastic resin composition that showed a marked improvement in chemical resistance and 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-diisoprobylhenzene, hydroquinone, resorcinol, 4.4- dihydroxydiphenyl, etc., and bisphenol 8 is particularly preferred. In addition, to obtain a branched aromatic polycarbonate resin, phloroglucin, 4,6-dimethyl-2,4,6-tri(4-hydroxyphenyl)heptene-2,4,6-
cymethyl-2.4.6-)li(4-hydroxyphenyl)-butane, 2,6-cymethyl-2.4.6-
) li (4-hydroxyphenyl)hebutene-3,4,
6-Simethyl-2.4.6-tri(4-hydroxyphenyl)hebutane, l.

3.5-tri(4-hydroxyphenyl)benzene,
1+ 1+ 1-1-li (4-hydroxyphenyl)
polyhydroxy compounds exemplified by ethane, and 3
゜3-bis(4-hydroxyaryl)oxindole (-isatinbisphenol), 5-chloroisatin, 5.7-cycloisatin, 5-bromiisatin, etc. as part of the dihydroxy compound, for example 0.2 to 2 mol % with polyhydroxy compound. Furthermore, monovalent aromatic hydroxy compounds suitable for controlling the molecular weight are m
Preferred are - and p-methylphenol, m- and p-propylphenol, p-bromophenol, p-tert-phthylphenol, and p-long chain alkyl-substituted phenol.Aromatic polycarbonate resins typically include bis- (4-Hydroxyphenyl)alkane dihydroxy compounds, especially polycarbonates whose main raw material is bisphenol A, polycarbonate copolymers obtained by using two or more aromatic dihydroxy compounds together, and trivalent phenol compounds. Branched polycarbonate obtained by using a small amount in combination can also be mentioned.Aromatic polycarbonate resin 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, the aromatic dicarboxylic acid has terephthalic acid or dimethyl terephthalate as the main component, 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 is prepared at 30°C in a mixed solvent of phenol and tetrachloroethylene in a weight ratio of 6:4.
Intrinsic viscosity (intrinsic viscosity) measured at 1.0 or higher, usually 1.
．． It is preferable to have a value of 0 to 1.5, and if it is less than 1.0, the improvement in impact strength and chemical resistance will be insufficient.

In the present invention, the above-mentioned C, polyester elastomer is blended into the above resin composition of aromatic polycarbonate resin and B, aromatic saturated polyester resin. Here, the polyester elastomer contains +11 terephthalic acid and 7
dicarboxylic acid or an ester-forming derivative thereof containing 0 mol% or more, (2) a low molecular weight glycol or an ester-forming derivative thereof containing 70 mol% or more of tetramethylene glycol, and (3) an average molecular weight of 500 to 5,0.
00 poly (oxyalkylene) glycol or its
This is a copolymer obtained by polycondensing an ester-forming derivative of Component (3) in a proportion of 70 to 9 Qw L% in the polyester elastomer.

Here, as the dicarboxylic acid containing 70 mol% or more of terephthalic acid or its ester-forming derivative in (1), those used as a dicarboxylic acid component other than terephthalic acid include aliphatic, alicyclic and aromatic acids. Any one may be used, and the molecular weight is usually 300 or less, and examples thereof include adipic acid, sepathic acid, cyclohexyl dicarboxylic acid, isophthalic acid, and naphthalene dicarboxylic acid. Moreover, as the glycol (2), the same diols as those used for the above-mentioned B component are exemplified. The poly (oxyalkylene) glycol (3) has an average molecular weight of t 5
00 to 5ooo, 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) glycol,
These include poly(propylene oxide) glycol and copolymers thereof, and poly(tetramethylene oxide) glycol is particularly preferred.

In the polycondensation of the above fil, (2) and (3), component (3) in the polyester elastomer obtained is 70 to 90%.
It is wt%. Furthermore, 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/dl of chlorophenol at 35 DEG C. is in the range of 0.5 to 5.0. As such polyester elastomer, Toyobo A1 is available under the trade name [Pelprene P 30].
8J is preferably used.

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

Aromatic polycarbonate resin is 65 to 90 wt%, B,
aromatic saturated polyester resin 8-30 wt% and C,
The polyester elastomer content ranges from 1 to 2511 t%. If the aromatic polycarbonate resin is less than 55wt%, the heat resistance will not reach the level required for engineering plastics, and the dimensional stability will be poor.
If it exceeds this, the improvement in moldability will be insufficient and the chemical resistance will also be insufficient. 'Aromatic saturated polyester resin is 8w
If it is less than L%, the improvement in chemical resistance will be insufficient, and if it exceeds 30wt%, it will cause poor dimensional stability.

Furthermore, if the polyester elastomer C1 is less than 1wL%, improvements in flexural modulus, chemical resistance, and surface hardness cannot be achieved, and if it exceeds 25wt%, it causes poor heat resistance.

The thermoplastic resin composition of the present invention as described above may contain various additives such as stabilizers, pigments, dyes, flame retardants, and lubricants, reinforcing materials such as inorganic or organic fiber substances, glass beads, etc., as desired. Various fillers may be blended, and other resin components may also be blended within a range that does not impair the characteristics of the present invention. For example, polycarbonate oligomers such as bisphenol A or tetrabromobisphenol A can be used to improve moldability, flame retardancy, and surface properties, and heat-resistant polyesters such as polyester carbonates and polyarylates (e.g., trade names: U polymer, unidecan n) For improving heat resistance, it is possible to incorporate

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.

Hereinafter, it will be explained using Examples and Comparative Examples.
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: Iupin S-1000, molecular weight 27.000), polyethylene terephthalate (
Manufactured by Toyobo #In, trade name: Univet RT-580, intrinsic viscosity 1.2 at 30't: Phenol/tetrachlorethylene-6-4 tomer (manufactured by Toyobo ■, trade name: Pelprene P30B) is shown in Table 1. The mixture was added to a blender and mixed for 30 minutes.

The resulting mixture was fed into a 40fi vented extruder,
The mixture was melted and kneaded at a cylinder temperature of 260°C to form 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, instead of the polyester elastomer of the present invention, one containing less than 70-t% of poly(tetramethylene oxide) glycol component (manufactured by Toyobo M■, trade name;
Resin composition using Perbrene P2BOB (Comparative 4N
-1), the physical properties of the resin compositions of aromatic polycarbonate resin and polyethylene terephthalate (Comparative Examples-2 & 3) and the aromatic polycarbonate resin alone (Comparative Example-4) 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: Toughvet IIll-1200, intrinsic viscosity 1.2 at 30°C, phenol/tetrachloroethylene = 6/4s+ (in a mixed solvent with a ratio of A test piece for measuring physical properties was molded. The measurement results are shown in Table 1. For comparison, the results of the resin composition of aromatic polycarbonate resin and polytetramethylene terephthalate are also listed in Table 1 as (Comparative Example-5).

Examples 9 and 10 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 formed in the same manner as Examples 6 to 8. Physical properties were measured. The results are shown in Table 1.

January 22, 1985 1. Indication of the case 1988 Patent Application No. 211402 2. Name of the invention Thermoplastic resin composition 3. Relationship with the person making the amendment (Patent Application No. 211402) (Applicant) 4. The following amendments are made to the [Detailed Description of the Invention] column 5 of the specification to be amended and the "Detailed Description of the Invention" column of the description of contents of the amendment.

■Correct "thickness dependence also" in the 5th line of page 4 to "thickness dependence".

(2) Correct "69" in the row of polycarbonate resin in column 1o of Table 1 on pages 14-15 to "67".

that's all

Claims (1)

[Claims] ^, Aromatic polycarbonate resin 65-90 wt%
B, aromatic saturated polyester resin 8-30-t% and C, polyester elastomer 1-25 wt%; derivatives, (2) low molecular weight glycols containing 70 mol% or more of tetramethylene glycol or ester-forming derivatives thereof, and (3) poly(oxyalkylene) glycols or ester-forming derivatives thereof having an average molecular weight of 500 to s, ooo. Component (3) is 70 to 9 in the polyester elastomer.
Thermoplastic resin composition 8 characterized in that it is formed by polycondensation at a ratio of 0wt%