JPS59197451A - Thermoplastic resin composition having excellent jet- black color - Google Patents

Abstract

PURPOSE:To provide a thermoplastic resin compsn. having an excellent jet-black color, by blending two specified carbon blacks having different properties with an AES resin. CONSTITUTION:100-5wt% graft polymer (A) obtd. by graft-polymerizing an arom. vinyl compd. (e.g. styrene or vinyltoluene), a vinyl cyanide compd. (e.g. acrylonitrile), etc. onto an ethylene/propylene rubbery copolymer is mixed with 0-95wt% arom. vinyl/vinyl cyanide copolymer to prepare an AES resin. 0.2- 3pts.wt. carbon black having a specific surface area of 400m<2>/g or above and a DBP oil absorption of 80ml/100g or above and 0.2-5pts.wt. carbon black having a specific surface area of 100-4002/g and a DBP oil absorption of 50ml/100g or above are mixed with 100pts.wt. AES resin to obtain the desired thermoplastic resin compsn.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermoplastic resin composition having excellent jet blackness and weather resistance.

A graft polymer obtained by graft polymerizing an aromatic vinyl compound, vinyl cyanide compound, etc. to an ethylene-propylene rubbery polymer, or a combination of such a graft polymer and an aromatic vinyl-vinyl cyanide copolymer. AES resin, which is a mixture, has excellent weather resistance, impact resistance, and chemical resistance, and is expected to be used in a wide range of fields. Carbon black also has the disadvantage of agglomeration when the concentration is increased, making it impossible to obtain molded products with satisfactory jet blackness and appearance. The inventors have discovered that a thermoplastic resin composition having excellent jet blackness can be obtained by using two types of black in combination, and have arrived at the present invention.

That is, the present invention provides the following method: in the presence of an ethylene-propylene rubbery copolymer, one or more compounds each selected from at least two groups of aromatic vinyl compounds, vinyl cyanide compounds, and other polymerizable monomer compounds. 100 to 5% by weight of the graft polymer obtained by polymerizing the above and one or more compounds selected from at least two groups of aromatic vinyl compounds, vinyl cyanide compounds, and other polymerizable monomer compounds. Copolymers 0 to 9 obtained by
Carbon black (with a specific surface area of 4007FZ''/P or more and a DBP oil absorption of 80+++g/1007 or more) for a resin composition (AES resin) consisting of 5% by weight
a) 0.2 to 3 parts by weight and a specific surface area of 100 m'
/f or more and less than 400m'/liter and DBP oil absorption is 50mA! The object of the present invention is to provide a thermoplastic resin composition having excellent jet black properties, which is characterized by containing ./100.

The present invention will be explained in detail below.

The ethylene-propylene rubbery copolymer constituting the graft polymer includes a binary copolymer of ethylene and propylene (EPR), a terpolymer of ethylene, propylene, and a non-conjugated diene (EPDM) ), and one or more types may be used.

Examples of non-conjugated dienes in the terpolymer (EPDM) include synchlopentadiene, ethylidene norbornene, 1.4-hexadiene, 1.4 cycloheptadiene,
Examples include 1,5-cyclooctadiene.

Binary copolymers (EPR) and terpolymers (EPDM)
The molar ratio of ethylene to propyrene in ) is preferably in the range of 5:1 to 1:3.

In addition, in the terpolymer (EPDM), it is preferable that the proportion of non-conjugated diene is in the range of 2 to 50 in terms of iodine value. Obtained by polymerizing one or more compounds each selected from at least two groups from aromatic vinyl compounds, vinyl cyanide compounds, and other polymerizable monomer compounds in the presence of these compounds in the graft polymer. The weight ratio of rubber and rubber can be selected within an appropriate range depending on the purpose. Usually, 5 to 70% rubber to 95 to 30% by weight of compound.
The copolymer constituting the AES resin together with the graft polymer includes aromatic vinyl compounds, vinyl cyanide compounds, and others. 0 obtained by polymerizing one or more compounds each selected from at least two groups of polymerizable monomer compounds of Preferably, the aromatic vinyl compound is 55-85% by weight and the vinyl cyanide compound and/or other polymerizable monomer compound is 45-15% by weight.

Examples of the aromatic vinyl compound constituting the graft polymer and copolymer in the AES resin include styrene, α-methylstyrene, α-chlorostyrene, vinyltoluene, and the like, with styrene being particularly preferred. As the vinyl cyanide compound, acrylonitrile, methacrylonitrile, etc. are preferred, and acrylonitrile is particularly preferred. Furthermore, other polymerizable monomer compounds include acrylic acid di-, xf- and methacrylic ester compounds such as methyl, ethyl, propyl, butyl, benzyl, and hexyl, and in particular, methyl methacrylate. is preferred.

All known methods can be used to make the graft polymer and copolymer.

Examples include suspension polymerization, bulk polymerization, emulsion polymerization, and solution polymerization.

Regarding the composition ratio of the graft polymer and copolymer in the AlC8 resin, if the graft polymer 1095 polymer is less than 5% by weight, that is, if the copolymer exceeds 955 parts by weight, the impact resistance will be poor, which is not preferable.

Preferably, the amount is 80-10% by weight of the graft polymer and 20-90% by weight of the copolymer.

Next, the car pump and rack used in the present invention have a specific surface area of 400 tri'/9 or more and a DBP oil absorption (dibutyl phthalate oil absorption) of 80.
Carbon black (,) with a wLl/100y or more and a specific surface area of 100 m'/7 or more 400 m
' / y or less, and DBP oil absorption 5ov/1o
The carbon black (b) is oy or more.

The content of the above carbon black (8) is AES resin 1
0.00 parts by weight, the amount is 0.2 to 3 parts by weight. If the amount is less than 0.2 parts by weight, the jet black property will not be improved, and if it exceeds 3 parts by weight, carbon black will aggregate, which is undesirable. , 0.2 to 5 parts by weight. 0.2
If it is less than 5 parts by weight, jet blackness will not be improved, and if it exceeds 5 parts by weight, carbon black will aggregate, which is not preferable.

In the present invention, the above-mentioned carbon blacks (a) and (b) are used, and the use of (, ) or (b) alone and the use of carbon black whose specific surface area or oil absorption is outside the above-mentioned ranges are prohibited. , the improvement in jet blackness cannot be measured.

In the present invention, known stabilizers, plasticizers, antistatic agents, ultraviolet absorbers, lubricants, fillers, etc. are blended in advance into the mixed composition, blended with carbon black, and after the carbon black is blended. Can be blended.

The present invention will be explained below using Examples, but the present invention is not limited in any way by these Examples.

Example After mixing AES resin and carbon black in the ratio shown in Table 1, a colored composition was obtained using an extruder. Thereafter, various test pieces were prepared using a 7-ounce injection molding machine. The evaluation results are shown in Table-1.

The AES resins (1 to 3) and carbon black used are as follows.

ES-1 400 parts by weight of EPDM, which has an iodine i value of 8.5, a Mooney viscosity of 61, a propylene content of 45% by weight, and contains ethylidene norbornene as a diene component, is dissolved in 3000 parts by weight of n-hexane and 1500 parts by weight of ethylene dichloride. 270 parts by weight, acrylonitrile) 130 parts by weight and 13 parts by weight of benzoyl peroxide were added, and the mixture was heated at 67°C for 10 minutes.
Polymerization was carried out in a nitrogen atmosphere for an hour. The polymerization solution was brought into contact with a large excess of methanol, and the deposited precipitate was separated and dried to obtain a polymer.

AES resin-2 70% by weight styrene and 30% by weight acrylonitrile
To 100 parts by weight of a mixed solution of t-dodecyl mercaptan, add 0. 1 part by weight and 0.3 parts by weight of benzoyl peroxide were added, and polymerization was carried out in an aqueous dispersion system by increasing the temperature from 30°C to 90°C for 10 hours. The copolymer obtained after dehydration (intrinsic viscosity 0
．． 50)? , (the above-mentioned AES resin-1 and 25Nia 5 were mixed at a ratio of 5 (weight ratio).

ES-3 A commercially available styrene-acrylonitrile copolymer having an intrinsic viscosity of 0.63 was mixed with the above-mentioned AES* fat at a ratio of 35:65 (weight ratio).

, carbon black (,) Specific surface area 650n? /! , DBP oil absorption 150-/
100 f carbon black.

Carbon black (b) Specific surface area 250 ni'/j', DBP oil absorption 13
0ml/100f! carbon black.

Carbon black■ Specific surface area 137 rri'/ri, DBP oil absorption 55m
A! 7100y commercially available carbon black.

(Mitsubishi Kasei Carbon #45) Table-1

Claims (1)

[Scope of Claims] 1) One or more of each of aromatic vinyl compounds, vinyl cyanide compounds, and other polymerizable monomer compounds selected from at least two groups in the presence of an ethylene-propylene rubbery copolymer. Polymerization of 100 to 5% by weight of a graft polymer obtained by polymerizing a compound of the above and one or more compounds each selected from at least two groups of aromatic vinyl compounds, vinyl cyanide compounds, and other polymerizable monomer compounds. The specific surface area is based on 100 parts by weight of a resin composition consisting of 0 to 95% by weight of the copolymer obtained by 400 nl/1 or more and DBP oil absorption 80-/
Car pump multiplicity (a) of 100F or more 0.2 to 3 parts by weight and specific surface area of 100 m” / !1 or more 40
0rr? /' less than 1 and DBP oil absorption is 50 we
/ 100 or more carbon black (b) 0.2-5
1. A thermoplastic resin composition having excellent jet black properties, characterized in that it contains part by weight of a thermoplastic resin composition.