JP3020704B2 - Resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a resin composition. More specifically, the present invention relates to a resin composition having excellent heat stability and heat resistance and good fluidity.

[0002]

2. Description of the Related Art A composition comprising a polycarbonate resin and a polyarylate resin is disclosed in JP-B-50-27061 and JP-A-48-54158. It is known as a composition having improved moldability of an arylate resin. However, when a composition comprising a polycarbonate resin and a polyarylate resin is injection-molded, the resulting molded product is liable to yellow, and a satisfactory molded product is often not obtained, and is not practically usable.

As a method for improving this disadvantage, Japanese Patent Laid-Open No.
Japanese Patent Application Laid-Open No. 8-176239 proposes a method of adding a phosphite. However, even with this method, yellowing progresses when stagnation occurs during molding, which is not satisfactory.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to suppress yellowing during melt molding of a resin composition comprising a polycarbonate resin and a polyarylate resin.

The present inventor has made intensive studies to solve the above-mentioned problems, and as a result, has found that the purpose can be achieved by adding an alkyl phosphate. As a result of repeated studies based on this finding, the present invention has been achieved.

[0006]

According to the present invention, 100 parts by weight of a resin composition comprising (A) 5 to 95% by weight of a polycarbonate resin and (B) 95 to 5% by weight of a polyarylate resin is added to (C) phosphoric acid. The present invention relates to a resin composition containing 0.01 to 2 parts by weight of an alkyl ester.

The polycarbonate resin (A) used in the present invention is produced by reacting a dihydric phenol with a carbonate precursor by a solution method or a melting method. Examples of the dihydric phenol used here include 2,2-bis (4-hydroxyphenyl) propane [commonly known as bisphenol A], bis (4-hydroxyphenyl) methane, 2,2
-Bis (4-hydroxy-3,5-dimethylphenyl)
Propane, 2,2-bis (4-hydroxy-3,5-dibromophenyl) propane, 2,2- (4-hydroxy-3-methylphenyl) propane, bis (4-hydroxyphenyl) sulfone and the like. Or two or more of them may be used in combination. Preferred dihydric phenols are those based on bis (4-hydroxyphenyl) alkanes, especially bisphenol A. Examples of the carbonate precursor include carbonyl halide, carbonyl ester, and haloformate, and specifically, phosgene,
Diphenyl carbonate, dihaloformates of dihydric phenols and mixtures thereof.

In producing the polycarbonate resin, an appropriate molecular weight regulator, a branching agent, a catalyst for accelerating the reaction, and the like can be used. The degree of polymerization of the polycarbonate resin does not need to be particularly limited, but is usually represented by a viscosity average molecular weight of 10,000 to 100,000, preferably 1500.
0 to 60000.

The polyarylate resin (B) used in the present invention may be obtained by a conventional method from a dihydric phenol or a derivative thereof and an aromatic dicarboxylic acid or a derivative thereof. Is, for example, 2,2-bis (4-hydroxyphenyl) propane,
Bis (4-hydroxyphenyl) methane, 2,2-bis (4-hydroxy-3,5-dimethylphenyl) propane, 2,2-bis (4-hydroxy-3,5-dibromophenyl) propane, 2, 2- (4-hydroxy-3-
Methylphenyl) propane, 4,4'-dihydroxydiphenylsulfone, 4,4'-dihydroxydiphenylether, 4,4'-dihydroxydiphenylsulfide and the like may be used, and two or more kinds may be used in combination. Preferred dihydric phenols are those based on bis (4-hydroxyphenyl) alkanes, especially bisphenol A.

Any aromatic dicarboxylic acid may be used as long as it reacts with a dihydric phenol to give a satisfactory polymer, and may be used alone or as a mixture of two or more. Preferred aromatic dicarboxylic acids include terephthalic acid and isophthalic acid, and mixtures thereof are particularly preferable in view of melt processability and overall performance. The mixing ratio of these mixtures is not particularly limited, but is preferably terephthalic acid / isophthalic acid = 9/1 to 1/9 (molar ratio), and is especially 7/3 in terms of balance between melt processability and performance. ~ 3
/ 7 (molar ratio) is preferred.

The mixing ratio of (A) the polycarbonate resin and (B) the polyarylate resin is determined by the desired fluidity, heat resistance and other physical properties, and can be in a wide range. ) When the blending ratio of the polycarbonate resin exceeds 95% by weight, the heat resistance improving effect of the polyarylate resin is not observed, and when the blending ratio of the (B) polyallylate resin exceeds 95% by weight, the fluidity improvement by the polycarbonate resin occurs. Since the effect is no longer seen, the polycarbonate resin (A) is usually selected from a range of 5 to 95% by weight, and the polyarylate resin (B) is appropriately selected from a range of 95 to 5% by weight.

The (C) alkyl phosphate ester used in the present invention has 1 to 20 carbon atoms, more preferably 1 to 1 carbon atoms.
Those esterified with the aliphatic alcohol (2) are preferred, and examples thereof include trimethyl phosphate, triethyl phosphate, tributyl phosphate, tri-2-ethylhexyl phosphate, and trioleyl phosphate. The alkyl phosphate is added in an amount of 0.01 to 100 parts by weight of the resin composition comprising (A) the polycarbonate resin and (B) the polyarylate resin.
By blending 2 parts by weight, preferably 0.03１1 part by weight, the thermal stability can be improved and yellowing during injection molding can be suppressed. When the addition amount of the alkyl phosphate is 0.0
When the amount is less than 1 part by weight, the effect of sufficiently suppressing the yellowing of the resin composition cannot be obtained, and when the amount exceeds 2 parts by weight, the heat resistance of the obtained composition is adversely affected.

The resin composition of the present invention comprises (A) a polycarbonate resin, (B) a polyarylate resin, and (C)
It can be produced by mixing the alkyl phosphate with a mixer such as a tumbler, blender, Nauter mixer, Banbury mixer, kneading roll, extruder and the like. Further, other additives such as an antioxidant, an ultraviolet absorber, a flame retardant, a release agent and the like may be added within a range not to impair the object of the present invention.

The resin composition of the present invention can be applied to any molding method, for example, injection molding, extrusion molding, compression molding, rotational molding, and the like. The resulting molded product has little yellowing, good hue, heat resistance, and fluidity. The properties are also very good.

[0015]

The present invention will be further described with reference to the following examples. In addition, the evaluation in an Example is based on the following method.

(1) Hue: The sample plate is continuously molded from the first shot to the fifteenth shot under the conditions described in the examples and comparative examples, and after molding is stopped for 10 minutes, from the sixteenth shot to the nineteenth shot Formed continuously. The molded product of the eighth shot was made before staying, and its hue (L value, a value,
b value) and the hue (L ′ value, a ′ value, b ′ value) of the molded article of the 19th shot after staying, and a colorimetric color difference meter [Z-1001DP type, Nippon Denshoku Industries Co., Ltd., C Light source], compare b value and b 'value, and

[0017]

(Equation 1) ΔE obtained by the above indicates the quality of the hue.

(2) Heat resistance: The heat deformation temperature under a load of 18.6 Kgf / cm ² was measured and shown in accordance with ASTM D-648.

(3) Flowability (MFR): JIS K-6
MF at 280 ° C and 2160g load according to 719
R was measured and shown.

[0020]

Examples 1 to 8 and Comparative Examples 1 to 7 Each component was mixed in a blending ratio shown in Table 1 using a V-type blender, and a 30 mmφ twin screw extruder [TEX30HSST- manufactured by Nippon Steel Works Co., Ltd.
40BW-4V] at a cylinder temperature of 340 ° C. The fluidity was measured using the pellets. After drying the pellets at 120 ° C. for 5 hours, a color sample plate and a test piece for measuring a heat distortion temperature were prepared by an injection molding machine [FUNAC Co., Ltd. T-150D]. The temperature was measured and the results are shown in Table 1.

[0021]

Reference Examples 1 and 2 Table 1 shows the fluidity and heat distortion temperature of the polycarbonate resin [viscosity average molecular weight 19700] and the polyarylate resin [U-100 manufactured by Unitika Ltd.] used in the above Examples and Comparative Examples. It was shown to.

The symbols in Table 1 are as follows. PC: polycarbonate resin [viscosity average molecular weight: 197
00] PAR: polyarylate resin [U-1 manufactured by Unitika Ltd.]
00] TMP: trimethyl phosphate TEP: triethyl phosphate TOP: tri-2-ethylhexyl phosphate DMP: benzene dimethyl phosphate TPP: triphenyl phosphate

[0023]

[Table 1]

[0024]

According to the present invention, since yellowing during melt molding can be significantly suppressed, a resin composition comprising (A) a polycarbonate resin and (B) a polyarylate resin can be put to practical use. The effect it produces is exceptional.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C08L 69/00 C08L 67/00-67/08 C08K 3/00-13/08

Claims (1)

(57) [Claims] (A) 5 to 95 layers of polycarbonate resin
The amount% and (B) a polyarylate resin 95-5 to 100 parts by weight of the resin composition comprising by weight%, (C) alkyl phosphate ester 0.01 to 2 parts by weight blended to become a resin composition.