JP3207576B2 - Reinforced aromatic polycarbonate resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a glass fiber reinforced aromatic polycarbonate resin composition. More specifically,
The present invention relates to a glass filler reinforced aromatic polycarbonate resin composition having good transparency and high rigidity.

[0002]

2. Description of the Related Art Aromatic polycarbonate resin is transparent,
Because of its excellent heat resistance and impact resistance, it is used as an alternative to glass for optical applications such as lenses and prisms. However, since the rigidity is lower than glass,
In applications requiring high rigidity, improvement is achieved by adding an appropriate filler such as glass fiber.

However, when a glass filler or the like is added, the refractive index of glass (usually about 1.545 for conventional glass) and the refractive index of aromatic polycarbonate resin (normally 1.50 for conventional aromatic polycarbonate resin).
(About 585), there is an inconvenience that transparency, which is a major feature of the aromatic polycarbonate resin, is impaired. As a solution to this, use of a glass filler having a refractive index close to the refractive index (nd) of the aromatic polycarbonate resin of 1.585 has been studied. For example, the use of ECR glass (manufactured by Asahi Fiber Glass Co., Ltd.) having a refractive index (nd) of 1.579 can provide considerable transparency, but is still insufficient.

[0004]

An object of the present invention is to provide a glass-reinforced aromatic polycarbonate resin composition having improved transparency while maintaining high rigidity. The present inventors have conducted intensive studies to achieve the above object, and as a result, the refractive index (nd) of the aromatic polycarbonate resin as a glass filler to be mixed with the aromatic polycarbonate resin
The use of glass fiber with a difference of 0.015 or less and the use of a specific amount of a polyethylene terephthalate resin or a polybutylene terephthalate resin further improved the transparency while surprisingly maintaining high rigidity. After further study, the present invention was completed.

[0005]

According to the present invention, there is provided an aromatic polycarbonate resin of 99 to 40% by weight and a glass filler having a difference in refractive index (nd) from the aromatic polycarbonate resin of not more than 0.015 to 1 to 60% by weight. % Resin composition 1
00 parts by weight of polyethylene terephthalate resin and / or
Alternatively, the present invention relates to a reinforced aromatic polycarbonate resin composition comprising 3 to 20 parts by weight of a polybutylene terephthalate resin.

[0006] The aromatic polycarbonate resin used in the present invention is derived from dihydric phenol, and its molecular weight is represented by a viscosity average molecular weight of 10,000 to 10
It is an aromatic polycarbonate resin of 000, preferably 15,000 to 60,000. It is usually obtained by reacting a dihydric phenol with a carbonate precursor by a solution method or a melting method. As the dihydric phenol, for example, 2,2-
Bis (4-hydroxyphenyl) propane [hereinafter referred to as bisphenol A], 1,1-bis (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxy-3,
5-dimethylphenyl) propane, 2,2-bis (4-
Hydroxy-3-methylphenyl) propane, bis (4
-Hydroxyphenyl) sulfone and the like, and bis (4-hydroxyphenyl) alkane is preferred, and bisphenol A is particularly preferred.

The carbonate precursor includes carbonyl halide, diaryl carbonate, haloformate and the like, and specifically, phosgene, diphenyl carbonate, dihaloformate of dihydric phenol and a mixture thereof. In producing the polycarbonate resin, the dihydric phenol may be used alone or in combination of two or more. In addition, a suitable molecular weight regulator, a branching agent, a catalyst for accelerating the reaction, and the like can also be used. Two or more aromatic polycarbonate resins thus obtained may be mixed.

The difference between the refractive index (nd) of the glass filler used in the present invention and the refractive index (nd) of the aromatic polycarbonate resin used must be 0.015 or less, and particularly the refractive index (nd) Those having a difference of nd) of 0.01 or less are preferable. If the difference in the refractive index (nd) is greater than 0.015,
The transparency of the resin composition is reduced even if an appropriate amount of a later-described polyethylene terephthalate resin or polybutylene terephthalate resin is used in combination. For the first time, a glass filler having a difference in refractive index (nd) from an aromatic polycarbonate resin of 0.015 or less, particularly 0.01 or less, is used and used in combination with an appropriate amount of a polyethylene terephthalate resin or a polybutylene terephthalate resin described later. Provision of a molded article with good transparency becomes possible.

The shape of the glass filler does not need to be particularly limited, and may be glass fiber, glass flake, glass beads,
Any shape such as glass powder which is usually blended with a thermoplastic resin may be used. These glass fillers are preferably surface-treated with a silane coupling agent or the like. Further, the glass used for these glass fillers is preferably alkali-free glass or a glass having a composition similar thereto.

The compounding amount of the glass filler is such that the aromatic polycarbonate resin in the resin composition comprising the aromatic polycarbonate resin and the glass filler is 99 to 40% by weight and the glass filler is 1 to 60% by weight. If the amount of the glass filler is less than 1% by weight, the molded article cannot have rigidity. If the amount exceeds 60% by weight, the molecular weight of the aromatic polycarbonate resin is reduced or the properties of the aromatic polycarbonate resin are utilized. Disappears.

[0011] Polyethylene terephthalate resin used in the present invention is a polymer obtained terephthalic acid or an ester-forming derivative thereof and ethylene glycol or an ester-forming derivative thereof to a condensation reaction as the main raw material.
The molecular weight of the polyethylene terephthalate resin is 0.4 to 1.2 as represented by the intrinsic viscosity measured at 25 ° C. using o-chlorophenol as a solvent.

The polybutylene terephthalate resin used in the present invention is a polymer obtained by a condensation reaction of terephthalic acid or an ester-forming derivative thereof with tetramethylene glycol or an ester-forming derivative thereof as a main raw material.
There is . The polybutylene terephthalate resin used in the present invention has a molecular weight of 25 using o-chlorophenol as a solvent.
It is 0.6 to 1.3 in terms of intrinsic viscosity measured at ° C.

The amount of the polyethylene terephthalate resin and / or the polybutylene terephthalate resin is as follows:
99 to 40% by weight of the aromatic polycarbonate resin and the difference in refractive index (nd) from the aromatic polycarbonate resin is 0.0
The amount is 3 to 20 parts by weight based on 100 parts by weight of the resin composition comprising 1 to 60% by weight of the glass fiber which is 15 or less. If the compounding amount is less than 3 parts by weight or exceeds 20 parts by weight, the transparency of the molded article is reduced even if a glass filler having a predetermined refractive index is used, and the object of the present invention is not achieved.

According to conventional knowledge, a composition comprising an aromatic polycarbonate resin and a glass filler has a refractive index (n).
d) adding about 1.64 polyethylene terephthalate resin and / or polybutylene terephthalate resin,
No improvement in transparency can be expected at all, and the effect of improving transparency by adding a polyethylene terephthalate resin and / or a polybutylene terephthalate resin is surprising.

The composition of the present invention can be produced by mixing each component with, for example, a tumbler, a blender, a Nauter mixer, a Banbury mixer, a kneading roll, an extruder, and the like. It is useful for houses and other parts requiring transparency.

The composition of the present invention can be molded as it is,
Further, a dye may be blended. By blending a dye, a molded article of any color tone can be obtained. As the dye, for example, an azo dye, a cyanine dye, a quinoline dye, a perylene dye, etc., can be used arbitrarily as long as they are those usually used for thermoplastic resins.
If the amount is too large, the transparency is lowered. Therefore, it is necessary to adjust the blending amount according to the purpose while observing the appearance of the molded product. Furthermore,
An effective expression amount of, for example, a stabilizer, a release agent, an ultraviolet absorber or the like may be blended within a range not to impair the object of the present invention.

[0017]

The present invention will be further described with reference to the following examples. The parts in the examples are parts by weight, and the flexural modulus (k
gf / cm ² ) is measured according to ASTM D-790, haze (%) is measured using a haze meter on a test piece of 50 mm × 50 mm × 2 mm, and light transmittance is 50 mm × 50 mm × 2.
The parallel light transmittance (%) was calculated by measuring a mm test piece in accordance with JIS K 7105.

[0018]

Example 1 A viscosity-average molecular weight of 24,000 and a refractive index of 1.
50.0 parts of an aromatic polycarbonate resin obtained from bisphenol A and phosgene having a refractive index of 1.579
Glass fiber (average fiber diameter 24μm, average fiber length 6mm)
20.0 parts and 5.0 parts of polybutylene terephthalate resin [TRB-H manufactured by Teijin Limited, intrinsic viscosity 1.07] are extruded at a cylinder temperature of 300 ° C. by an extruder [VSK-30 manufactured by Nakatani Corporation]. Pelletized. The pellet temperature of this pellet was 310 using an injection molding machine [Nestal Cycap 480/150 manufactured by Sumitomo Heavy Industries, Ltd.].
A test piece and a sample plate were prepared at 100 ° C. and a mold temperature of 100 ° C. The evaluation results are shown in Table 1.

[0019]

Example 2 A test piece and a sample plate were prepared in the same manner as in Example 1 except that the amount of the polybutylene terephthalate resin used was changed to 10.0 parts, and the evaluation results are shown in Table 1.

[0020]

Example 3 A test piece and a sample plate were prepared in the same manner as in Example 1 except that the amount of the polybutylene terephthalate resin used was 15.0 parts, and the evaluation results are shown in Table 1.

[0021]

Example 4 Polyethylene terephthalate resin [Teijin Co., Ltd.] was used instead of 5.0 parts of polybutylene terephthalate resin.
A test piece and a sample plate were prepared in the same manner as in Example 1 except that
Table 1 shows the evaluation results.

[0022]

Example 5 Polybutylene terephthalate resin [Teijin Co., Ltd.] was used in place of 5.0 parts of polybutylene terephthalate resin.
Example 1 except that a mixture of 5.0 parts of TRB-H, intrinsic viscosity 1.07] and 5.0 parts of polyethylene terephthalate resin [TR-8580, intrinsic viscosity 0.8] of polyethylene terephthalate resin was used. A test piece and a sample plate were prepared in the same manner, and the evaluation results are shown in Table 1.

[0023]

Comparative Example 1 A test piece and a sample plate were prepared in the same manner as in Example 1 except that no polybutylene terephthalate resin was used. Table 1 shows the evaluation results.

[0024]

Comparative Example 2 In place of glass fiber having a refractive index of 1.579, 20.0 parts of glass fiber having a refractive index of 1.545 (average fiber diameter: 13 μm, average fiber length: 3 mm) was used, and no polybutylene terephthalate resin was used. Except for the above, a test piece and a sample plate were prepared in the same manner as in Example 1, and the evaluation results are shown in Table 1.

[0025]

Comparative Example 3 In the same manner as in Example 2 except that 20.0 parts of a glass fiber having a refractive index of 1.545 (average fiber diameter: 13 μm, average fiber length: 3 mm) was used instead of the glass fiber having a refractive index of 1.579. Thus, a test piece and a sample plate were prepared, and the evaluation results are shown in Table 1.

[0026]

Comparative Example 4 In the same manner as in Example 4 except that 20.0 parts of a glass fiber having a refractive index of 1.545 (average fiber diameter: 13 μm, average fiber length: 3 mm) was used instead of the glass fiber having a refractive index of 1.579. Pellets were formed to prepare test pieces and sample boards, and the evaluation results are shown in Table 1.

In Table 1, PC indicates an aromatic polycarbonate resin, PBT indicates a polybutylene terephthalate resin, and PET indicates a polyethylene terephthalate resin.

[0028]

[Table 1]

[0029]

According to the present invention, the transparency is improved while maintaining high rigidity. For example, the glass-reinforced aromatic polycarbonate is useful for automobile sunroofs, windows, horticultural houses, and other parts requiring transparency. It has become possible for the first time to provide a resin composition, and the industrial effects achieved are outstanding.

Claims (1)

(57) [Claims] 1. An aromatic polycarbonate resin 99 to 40.
Glass filler 1 having a difference of 0.015 or less in weight% and a refractive index (nd) with the aromatic polycarbonate resin.
100 parts by weight of a resin composition consisting of a polyethylene terephthalate resin (terephthalic acid or a resin thereof)
Stele-forming derivatives and ethylene glycol or S
Obtained by a condensation reaction using
Polymer) and / or polybutylene terephthalate resin
(Telephthalic acid or its ester-forming derivative and tetra
Mainly methylene glycol or its ester-forming derivatives
Polymer obtained by a condensation reaction as a raw material)
A reinforced aromatic polycarbonate resin composition formulated by weight.