JPH0116866B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Technical Field] The present invention relates to a polycarbonate resin composition that has improved solvent resistance while maintaining the impact resistance, heat resistance, and transparency of the polycarbonate resin. [Prior Art] Polycarbonate resin is a molding resin with excellent physical properties such as impact resistance and thermal properties, but it has the disadvantage that it is susceptible to cracking when subjected to concentrated stress in the presence of a solvent. without significantly impairing the excellent impact resistance, heat resistance, and transparency inherent to polycarbonate resin.
In order to improve solvent resistance etc., it has been proposed to blend polycarbonate resin and polyester resin. For example, Japanese Patent Publication No. 36-14035 describes that blending a polyester resin lowers the melt viscosity of a polycarbonate resin and improves its moldability and solvent resistance. but,
This composition has the drawback of low impact strength and high dependence of impact strength on thickness. Also, JP-A-48
-54160 and JP-A-49-107354 also have similar descriptions, but they have the disadvantage of poor transparency.
Furthermore, JP-A-52-111956 describes a composition in which a carboxylic acid or the like is added as a stabilizer to a composition consisting of a polycarbonate resin and a polyester resin, but adding carboxylic acid prevents a decrease in transparency. I can't. Therefore, an object of the present invention is to provide a polycarbonate resin composition that maintains the excellent impact resistance, heat resistance, and transparency of polycarbonate resin and has excellent solvent resistance. [Means for Solving the Problems] As a result of intensive research to achieve the above object, the present inventors have developed a resin composition in which an alkali metal carboxylic acid salt is added to a composition consisting of a polycarbonate resin and a polyester resin. It was discovered that it has extremely excellent properties, and based on this knowledge, the present invention was completed. That is, the present invention provides a polyester resin (B) comprising 90 to 10% by weight of a polycarbonate resin (A) and a bifunctional carboxylic acid component and a diol component.
This is a polycarbonate resin composition characterized in that 0.02 to 0.2% by weight of an alkali metal carboxylic acid salt is added to a composition consisting of 10 to 90% by weight. The polycarbonate resin used in the present invention has the following general formula: (Here, Z is a bond, or alkylene having 1 to 8 carbon atoms, alkylidene having 2 to 8 carbon atoms, or 5 carbon atoms.
~15 cycloalkylene, C5-15 cycloalkylidene, SO ₂ , SO, O, CO or R means a hydrogen, chlorine or bromine atom or a saturated alkyl group having 1 to 8 carbon atoms, and m represents a number from 0 to 4. ) It is a polymer having a structural unit represented by: This polycarbonate resin is prepared by a solvent process, i.e. by reaction of dihydric phenols with carbonate precursors such as phosgene or by reaction of dihydric phenols with carbonate precursors such as phosgene in a solvent such as methylene chloride in the presence of known acid acceptors, molecular weight modifiers, etc. It can be produced by transesterification with a carbonate precursor such as carbonate. Here, dihydric phenols that can be suitably used include bisphenols, and 2,2-bis(4-hydroxyphenyl)propane (bisphenol A) is particularly preferred. Also, bisphenol A
may be partially or entirely replaced with other dihydric phenols. Examples of divalent phenols other than bisphenol A include hydroquinone, 4,4'-dihydroxydiphenyl, bis(4
-hydroxyphenyl)alkane, bis(4-hydroxyphenyl)cycloalkane, bis(4-
Compounds such as hydroxyphenyl) sulfide, bis(4-hydroxyphenyl) sulfone, bis(4-hydroxyphenyl) sulfoxide, bis(4-hydroxyphenyl) ether or bis(3,5-dibromo-4- Examples include halogenated bisphenols such as hydroxyphenyl)propane and bis(3,5-dichloro-4-hydroxyphenyl)propane. It may be a homopolymer, a copolymer or a blend of two or more of these dihydric phenols.
Furthermore, it may be a thermoplastic randomly branched polycarbonate obtained by reacting a polyfunctional aromatic compound with a dihydric phenol and/or a carbonate precursor. From the viewpoint of mechanical strength and moldability, the polycarbonate resin used in the present invention preferably has a viscosity average molecular weight of 10,000 to 100,000, particularly
20,000 to 40,000 is suitable. The resin composition of the present invention is formed by blending 10 to 90% by weight of a specific polyester resin with the above-mentioned polycarbonate resin. If the amount of polyester resin blended is less than 10% by weight, the solvent resistance of the resin composition will be insufficient, and if it exceeds 90% by weight, the impact resistance of the resin composition will be greatly reduced, which is unsuitable. The amount of polyester resin blended is preferably 10 to 60% by weight. The polyester resin used here has the following general formula consisting of a bifunctional carboxylic acid component and a diol component. (In the formula, Ar is an aromatic hydrocarbon group, Z is a divalent group, and n is a number from 1 to 30.) This is a polyester resin mainly composed of aromatic dicarboxylate units. The intrinsic viscosity of this polyester resin is usually 0.4 to 1.5 dl/g, preferably 0.5 to 1.5 dl/g.
It is 1.2dl/g. Examples of the difunctional carboxylic acid component include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, and naphthalene dicarboxylic acid. Among these, terephthalic acid is preferred, and other difunctional carboxylic acid components may be used in combination within a range that does not impair the effects of the present invention. They are, for example, oxalic acid,
Aliphatic dicarboxylic acids such as malonic acid, adipic acid, suberic acid, azelaic acid, sebacic acid or decanedicarboxylic acid, and ester-forming derivatives thereof. The proportion of these other dicarboxylic acid components is generally 20 mol% based on the total dicarboxylic acid.
It should be within the range. The diol component is not particularly limited, and various types such as alkylene glycol, polyalkylene glycol, aromatic diol, bridged hydrocarbon diol, etc. can be used alone or in combination of two or more. There are no particular restrictions on the alkylene glycol, but specific examples include ethylene glycol, propylene-1,2-glycol, propylene-1,3-glycol, butylene-1,4-glycol, butylene-2,3-glycol, and hexane. -1,6-
Aliphatic diols having 2 to 15 carbon atoms such as diol, octane-1,8-diol, neopentyl glycol or decane-1,10-diol can be used. Among them, ethylene glycol and butylene glycol are preferred. In addition, polyalkylene glycols include diethylene glycol, triethylene glycol,
Poly(alkylene oxide)-α,ω-diols such as polyethylene glycol, polypropylene glycol, polytetramethylene glycol, poly(tetramethylene oxide)-α,ω-diol, and random or block combinations of ethylene oxide and 1,2-propylene oxide. Various materials such as polymers can be used. Among them, polyethylene glycol and tetramethylene glycol having a molecular weight of 300 to 3000 are preferred. The aromatic diol is not particularly limited as long as it has an aromatic ring, but in particular those of the following general formula (In the formula, X is -CH ₂ O-, -C ₂ H ₄ O-, or -
Any group of C ₃ H ₆ O-, n is a number from 3 to 8, Y
teeth

〔Example〕

Examples 1 to 5, Comparative Examples 1 to 7 Bisphenol polycarbonate resin (manufactured by Idemitsu Petrochemical Co., Ltd., "A-2200", viscosity average molecular weight
21000), polyethylene terephthalate (manufactured by Kuraray Co., Ltd., intrinsic viscosity 0.68 dl/g), and alkali metal carboxylic acid salts were supplied to an extruder and kneaded at a cylinder temperature of 270 to 280°C and a die temperature of 270°C. ,
Made into pellets. After drying the obtained pellets at 120°C for 12 hours,
A test piece was obtained by injection molding (mold temperature 80-90°C). The physical property measurement results for this test piece are
Shown in the table. Examples 6 to 8, Comparative Examples 8 to 10 Terephthalic acid and polyethylene glycol/ethylene glycol = 1/99 as polyester resin
The same operation as in Example 2 was performed except that a diol component having a molar ratio of (molar ratio) was used. The results are shown in Table 1. Example 9 Terephthalic acid and "Uniol DA700"/ethylene glycol = 20/80 as polyester resin
The same operation as in Example 2 was performed except that a diol component having a molar ratio of (molar ratio) was used. The results are shown in Table 1. Example 10 Terephthalic acid and tricyclodecane dimethanol/ethylene glycol as polyester resin
The same operation as in Example 2 was carried out except that a diol component of 20/80 (molar ratio) was used. The results are shown in Table 1.

【table】

【table】

Claims (1)

[Scope of Claims] 1. An alkali metal carboxylic acid salt is added to a composition consisting of 90 to 10% by weight of a polycarbonate resin (A) and 10 to 90% by weight of a polyester resin (B) consisting of a bifunctional carboxylic acid component and a diol component. 0.02-0.2% by weight
A polycarbonate resin composition characterized in that it is added. 2. The polycarbonate resin composition according to claim 1, wherein the alkali metal carboxylate is sodium stearate and/or sodium benzoate.