JP3046412B2 - Resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition, and more particularly to a glass filler-containing resin molded product having an improved surface hardness, which is useful for containers and parts of cameras, VTRs, general electric appliances and the like. The present invention relates to a thermoplastic resin composition that can be produced.

[0002]

2. Description of the Related Art Conventionally, a resin composition in which a glass-based filler is blended with polycarbonate has excellent appearance, rigidity, mechanical strength, and dimensional accuracy, and is widely used in containers and parts of cameras, VTRs, general electric appliances and the like. in use. However,
The surface hardness of a molded article made of such a resin containing a glass-based filler is not much different from that of the resin of the base material, and there is a defect that scratches are likely to occur during use.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a resin composition capable of producing a resin molded article containing a glass filler having improved surface hardness.

The present inventors have conducted intensive studies to achieve the above object, and as a result, by adding a specific amount of a specific whisker together with a glass filler, the surface hardness can be remarkably improved, and the appearance, rigidity and mechanical properties can be further improved. The inventors have sought to improve the strength and dimensional accuracy and completed the present invention.

[0005]

The present invention relates to (A) a polycarbonate.
-100 parts by weight of carbonate , (B) glass-based filler 3 to
100 parts by weight and (C) boric acid having an average diameter of 1 μm or less
The present invention relates to a resin composition containing 5 to 50 parts by weight of minium whiskers.

The thermoplastic resin (A) used in the present invention comprises:
There is no particular limitation as long as it is a thermoplastic resin that can be molded by blending a glass filler. For example, polyethylene, polypropylene, ethylene-propylene copolymer, polystyrene, ABS resin, AES resin, AS resin, acrylic resin, polymethylpentene, Examples include polyamide, polyethylene terephthalate, polybutylene terephthalate, polyarylate, polyacetal, polycarbonate, polyphenylene ether, polysulfone, polyphenylene sulfide, polyether sulfone, polybutadiene, and the like, or copolymers, mixtures, and modified products of these polymers.

The (B) glass-based filler used in the present invention is not particularly limited in its shape such as glass fibers, glass flakes and glass beads, and may be any as long as it is used for a thermoplastic resin. More than one species may be used in combination. Any material may be used as long as it is used for a thermoplastic resin, and any of alkali-containing glass, low-alkali glass, and non-alkali glass can be used.

The average length of glass fiber is 0.0
The diameter is preferably 1 to 10 mm, and the average diameter is preferably 3 to 30 μm. The shape is not particularly limited, and may be any of roving, milled fiber, chopped strand and the like. As glass flakes, the average particle size (the longest part of the flakes) is 0.01 to
Those having a thickness of 3 mm and a thickness of 1 to 10 μm are preferred. Glass beads having an average particle diameter of 1 to 100 μm are preferred. In addition, even if these glass-based fillers are subjected to a surface treatment such as a silane coupling agent for the purpose of improving the affinity with the resin, they are bundled with an acrylic resin, a urethane resin or the like for the purpose of improving the handleability. May be applied.

If the amount of the glass-based filler is too small, rigidity, mechanical strength, dimensional accuracy and the like become insufficient, and if it is too large, molding becomes difficult. The range of from 100 to 100 parts by weight is suitable, and the range of from 5 to 80 parts by weight is particularly preferred.

[0010] As (C) an aluminum borate <br/> whiskers used in the present invention, the diameter is smaller permissible not Nanito be but, than the surface hardness of the molded article obtained with too large can not be little improvement , and particularly preferably equal to or less than 1 [mu] m. Also, the whisker may be subjected to a surface treatment such as a silane coupling agent for the purpose of improving the affinity with the resin, or may be subjected to a focusing treatment with an acrylic resin, a urethane resin or the like for the purpose of improving the handleability. Good.

If the amount of the whisker is too small, the surface hardness is not improved, and if the amount is too large, molding becomes difficult or the thermoplastic resin deteriorates. Therefore, 5 to 5 parts by weight of the thermoplastic resin is used. A range of 50 parts by weight is suitable, and a range of 10 to 40 parts by weight is particularly preferred. Further, it is preferable that the total amount of the glass-based filler and the whisker does not exceed 150 parts by weight.

The resin composition of the present invention can be produced by mixing the components with a mixer such as a tumbler, a blender, a Nauter mixer, a Banbury mixer, a kneading roll, and an extruder.

The resin composition of the present invention may contain an effective amount of a stabilizer, a release agent, etc. as long as the purpose is not impaired.

[0014]

The present invention will be further described with reference to the following examples. Parts in the examples are parts by weight. Flexural modulus is 127
ASTM using a test piece of mm × 12.7 mm × 6.4 mm
Measured according to D-790, surface hardness is 50mm x 50mm
JIS K5400 using a × 2 mm test piece (the pencil was Mitsubishi Uni, the angle between the molded product and the pencil was 45 degrees, and the load was 1.0
± 0.05 kg) according to a pencil scratch test.

[0015]

Example 1 (A) Polycarbonate [Teijin Chemical Co., Ltd.]
100 parts of Panlite L-1225WP], 35 parts of (B) glass fibers [PFB-101 manufactured by Nitto Boseki Co., Ltd., average fiber length of about 40 μm, average fiber diameter of about 9 μm] and (C) aluminum borate whisker [average length] 10-30 μm,
35 parts of an average diameter of 0.5 to 1 μm] was extruded with a cylinder temperature of 300 ° C. using an extruder [VSK-30 manufactured by Nakatani Corporation].
Extruded into pellets, and the pellets are injected into an injection molding machine [Sumitomo Cycap S-480 manufactured by Sumitomo Heavy Industries, Ltd.]
/ 150], a test piece was prepared at a cylinder temperature of 310 ° C., and the evaluation results of each test piece are shown in Table 1.

[0016]

Example 2 (A) Polycarbonate [Teijin Chemical Co., Ltd.]
Pan Light L-1225WP] 100 parts, (B) glass beads [EGB731A manufactured by Toshiba Barotini Co., Ltd.,
35 parts of aluminum borate whiskers (average length: 10 to 30 μm, average diameter: 0.1 μm).
35 to 5 μm] were pelletized in the same manner as in Example 1 to prepare test pieces, and the evaluation results of each test piece are shown in Table 1.

[0017]

Comparative Example 1 (A) Polycarbonate [Teijin Chemical Co., Ltd.]
Example 1 comprises 100 parts of Panlite L-1225WP] and 35 parts of (B) glass fiber [PFB-101 manufactured by Nitto Boseki Co., Ltd., average fiber length: about 40 μm, average fiber diameter: about 9 μm].
Pellets were prepared in the same manner as described above to prepare test specimens.

[0018]

Comparative Example 2 (A) Polycarbonate [Teijin Chemical Co., Ltd.]
Panlight L-1225WP] 100 parts and (B) glass beads [EGB731 manufactured by Toshiba Barotini Co., Ltd.]
A, an average particle size of about 18 μm] 35 parts were pelletized in the same manner as in Example 1 to prepare test pieces. The evaluation results of each test piece are shown in Table 1.

[0019]

[Table 1]

[0020]

According to the present invention, the glass-filled resin molded article obtained from the resin composition of the present invention has significantly improved surface hardness and further improved properties such as appearance, rigidity, mechanical strength and dimensional accuracy. Thus, the industrial effects of the present invention are extremely large.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-301259 (JP, A) JP-A-59-189164 (JP, A) JP-A-2-219840 (JP, A) JP-A-59-189 136338 (JP, A) JP-A-4-202475 (JP, A) JP-A-3-162445 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C08K 3/00-13 / 08 C08L 1/00-101/16

Claims (1)

(57) [Claims] (A) 100 parts by weight of a polycarbonate , (B) 3 to 100 parts by weight of a glass filler and (C)
Aluminum borate whiskers with an average diameter of 1 μm or less
A resin composition containing 50 parts by weight.