JP3436795B2 - Thermoplastic 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 thermoplastic resin composition having a good balance of properties such as impact resistance, rigidity and moldability, which is composed of three components, ABS resin, thermoplastic polyester resin and aromatic polycarbonate resin. .

[0002]

2. Description of the Related Art Polymer alloys containing ABS resin, thermoplastic polyester resin and aromatic polycarbonate resin as components are known. By optimizing the composition of the ternary blend, desired performance can be imparted. However, this blend often
Probably, the transesterification reaction between the polyester and the polycarbonate during the melt-kneading causes a problem that the impact strength is lowered and the molded product is discolored. Stabilizers are kneaded in commercially available styrene resins, polyester resins, and polycarbonate resins, but these stabilizers cannot prevent these defects that occur during the three-component melt kneading. Further, even if a small amount of hindered phenol, a phosphorus-based stabilizer or the like was added during melt-kneading, it could not be prevented.

[0003]

In order to solve the above problems, the present inventor has studied various stabilizers, and as a result, boric acid,
The present invention has been found to be effective in borate and borate ester, leading to the present invention.

That is, the present invention provides (A) ABS resin 90.
A thermoplastic resin composition obtained by adding 0.002 to 2 parts by weight of boric acid or boric acid ester to 100 parts by weight of a resin composition consisting of 10 to 40% by weight of the following component (B) and 10 to 40% by weight, (B), (B-1) thermoplastic polyester resin and (B-
2) A resin mixture containing an aromatic polycarbonate resin, the composition ratio of (B-1) and (B-2) being 95/5 to 5
/ 95.

The present invention will be described in detail below.

The ABS resin (A) used in the present invention is represented by a vinyl cyan compound represented by acrylonitrile and styrene represented by acrylonitrile in the presence of a copolymer having butadiene as a component such as polybutadiene or styrene-butadiene copolymer. A resin obtained by graft-copolymerizing a vinyl aromatic hydrocarbon, a mixture of the same graft copolymer resin and a vinyl cyan compound-vinyl aromatic hydrocarbon copolymer resin,
Alternatively, it is a mixture of polybutadiene or a copolymer containing butadiene as one component and the vinyl cyan compound-vinyl aromatic hydrocarbon copolymer resin.

The aromatic polycarbonate resin (B-2) used in the present invention is a homo- or copolymer produced by using dihydric phenols, phosgene or carbonic acid diester and a terminal stopper. Specifically, it is a polycarbonate-based polymer produced by reacting one or more bisphenol compounds with a carbonic acid ester such as phosgene or diphenyl carbonate. Examples of the bisphenol compound include bis (4-hydroxyphenyl) methane, bis (4-hydroxyphenyl) methane,
1,1-bis (4-hydroxyphenyl) ethane, 1,
1-bis (4-hydroxyphenyl) propane, 2,2
-Bis (4-hydroxyphenyl) propane (bisphenol A), 2,2-bis (4-hydroxyphenyl)
Butane, 2,2-bis (4-hydroxyphenyl) pentane, 2,2-bis (4-hydroxyphenyl) 3-methylbutane, 2,2-bis (4-hydroxyphenyl)
Hexane, 2,2-bis (4-hydroxyphenyl) 4
-Methylpentane, 1,1-bis (4-hydroxyphenyl) cyclopentane, 1,1-bis (4-hydroxyphenyl) cyclohexane, bis (4-hydroxy-3)
-Methylphenyl) methane, 1,1-bis (4-hydroxy-3-methylphenyl) ethane, 2,2-bis (4
-Hydroxy-3-methylphenyl) propane, 2,2
-Bis (4-hydroxy-3-ethylphenyl) propane, 2,2-bis (4-hydroxy-3-isopropylphenyl) propane, 2,2-bis (4-hydroxy-3-secbutylphenyl) propane, Bis (4-hydroxyphenyl) phenylmethane, 1,1-bis (4
-Hydroxyphenyl) -1-phenylethane, 1,1
-Bis (4-hydroxyphenyl) -1-phenylpropane, bis (4-hydroxyphenyl) diphenylmethane, bis (4-hydroxyphenyl) dibenzylmethane, 4,4'-dihydroxydiphenyl ether, 4,
4'-dihydroxydiphenyl sulfone, 4,4'-
Dihydroxydiphenyl sulfide and the like can be mentioned.

The thermoplastic polyester resin (B-1) used in the present invention comprises an aromatic dicarboxylic acid or ester-forming derivative and an aliphatic dihydroxy compound. Specifically, it is polyethylene terephthalate, polybutylene terephthalate, poly-1,4-dimethylol-cyclohexane terephthalate, or the like. In addition to these crystalline polyesters, isophthalic acid, p-β-ethoxybenzoic acid, 2-6-naphthalenedicarboxylic acid, 4,4'-dicarboxyl diphenol, 4,4'-dicarboxyl as other polymerization components Benzophenone, bis (4-carboxylphenol) ethane, adipic acid,
Dicarboxylic acid components such as sepacic acid, 5-sodium sulfoisophthalic acid, cyclohexane-1,4-dicarboxylic acid, propylene glycol, butanediol, neopentyl glycol, diethylene glycol, cyclohexanediol, ethylene oxide adduct of bisphenol A, polyethylene glycol, A glycol component such as polypropylene glycol or polytetramethylene glycol, an oxycarboxylic acid component such as p-oxybenzoic acid, or the like can be arbitrarily selected. Other copolymerizable components may include a small amount of a compound containing an amide bond, a urethane bond, an ether bond, and a carbonate bond.

In the present invention, the component (B) is a mixture of the thermoplastic polyester resin (B-1) and the aromatic polycarbonate resin (B-2), and the components (B-1) and (B-
The mixing ratio with 2) is in the range of 95/5 to 5/95.

Examples of the boric acid or boric acid ester used in the present invention include boric acid, methyl borate, dimethyl borate, ethyl borate, diethyl borate, isopropyl borate, diisopropyl borate, propyl borate, dipropyl borate, heptyl borate, diheptyl borate, boric acid. Examples thereof include boric acid esters such as octyl, boric acid phenyl esters such as phenyl borate, cresyl borate and dicresyl borate, and borate salts such as sodium borate and potassium borate. Diethyl borate and diphenyl borate are preferable, and boric acid is particularly preferable.

The resin composition of the present invention contains the above-mentioned components as essential components, but various additives such as flame retardants, pigments, inorganic or organic fibers, and powders may be blended in the preparation of the composition. it can.

The blending amount in the present invention is 0.002 to 2 parts by weight of boric acid or boric acid ester based on 100 parts by weight of a resin composition consisting of 90 to 60% by weight of ABS resin and 10 to 40% by weight of component (B). Add part. If the amount of the ABS resin added exceeds 90% by weight, the impact strength decreases, which is not preferable, and if it is less than 60% by weight, the fluidity becomes poor and the moldability decreases. If the amount of boric acid or borate ester added is less than 0.002 parts by weight, discoloration will occur in the final composition, and if it exceeds 2 parts by weight, the effect of inhibiting discoloration will be little changed.

As the method and means for blending the thermoplastic resin composition, conventional ones can be used. For example, a mixer such as a ribbon blender, a tumble mixer, a Henschel mixer, an open roll, a Banbury mixer, or a single shaft can be used. The resin composition can be obtained by using a screw extruder, a twin screw extruder, a single screw reciprocating screw kneader, or the like.

[0014]

EXAMPLES ABS resin is Sebian 660SF manufactured by Daicel Chemical Industries, and PBT is a thermoplastic polyester resin.
(Duranex 800F manufactured by Polyplastics Co., Ltd.
P) is used as an aromatic polycarbonate resin, Iupilon S1000 manufactured by Mitsubishi Gas Chemical Industry. Pellets were obtained by melt-kneading using a 30 mmφ twin-screw extruder at a set temperature of 270 ° C. or lower. Using the pellets, dumbbell pieces were prepared by injection molding at a temperature of 270 ° C. or lower, and the mechanical properties and color tone were evaluated. Regarding the color tone, it is marked with × against the ABS resin color, and ABS.
A mark that is almost the same as the color of the resin is marked with a circle. The results are shown in Table 1.

[0015]

[Table 1]

[0016]

EFFECT OF THE INVENTION By adding boric acid or boric acid ester to a ternary blend containing ABS, polyester and polycarbonate as essential components, a material having high impact strength was obtained. In addition, discoloration during extrusion, which is considered to be caused by the transesterification reaction between polycarbonate and polyester, was also prevented.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ identification code FI C08L 69:00) (58) Fields surveyed (Int.Cl. ⁷ , DB name) C08L 55/02 C08K 3/38 C08K 5 / 55 C08L 67/02 C08L 69/00

Claims (3)

(57) [Claims] 1. A resin composition 10 comprising 90 to 60% by weight of (A) ABS resin and 10 to 40% by weight of component (B) below.
0.002 parts by weight of boric acid or borate ester
~ 2 parts by weight of a thermoplastic resin composition added. (B), (B-1) thermoplastic polyester resin and (B-
2) A resin mixture containing an aromatic polycarbonate resin, the composition ratio of (B-1) and (B-2) being 95/5 to 5
/ 95. 2. (A) ABS resin 90 to 60% by weight and below
Resin composition 10 comprising 10 to 40% by weight of component (B)
0.002 parts by weight of boric acid or borate ester
˜2 parts by weight (B-
1) Thermoplastic polyester resin and (B-2) aromatic poly
Molding due to transesterification reaction with carbonate resin
Thermoplastic resin that prevents deterioration of impact strength and discoloration of products
Fat composition. (B), (B-1) thermoplastic polyester resin and (B-
2) Resin mixture consisting of aromatic polycarbonate resin
And the composition ratio of (B-1) and (B-2) is 95/5 to 5
/ 95. 3. (A) ABS resin 90 to 60% by weight
Resin composition 100 comprising 10 to 40% by weight of component (B)
With respect to parts by weight, boric acid, methyl borate, dimethyl borate, boro
Ethyl acid, diethyl borate, isopropyl borate, diborate
Sopropyl, propyl borate, dipropyl borate, borate hep
Chill, diheptyl borate, octyl borate, phenyl borate,
Cresyl borate, dicresyl borate, sodium borate, boric acid
Add 0.002 to 2 parts by weight of one selected from potassium
The thermoplastic resin composition according to claim 1 or 2, wherein