Chemistry of hydrocarbon compounds – Product blend – e.g. – composition – etc. – or blending process... – Component of indefinite molecular weight greater than 150
Patent
1998-09-29
2000-10-17
Knode, Marian C.
Chemistry of hydrocarbon compounds
Product blend, e.g., composition, etc., or blending process...
Component of indefinite molecular weight greater than 150
585 10, 585 11, 585 12, 208 20, C10L 116, C10M10102, C10M10700, C10M14300, C10G 7336
Patent
active
061334901
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE TECHNIQUE
The present invention relates to a dispersant for dispersing pigments in aromatic polymers, which comprises a wax of copolymer of ethylene with an aromatic vinyl compound.
BACKGROUND OF THE TECHNIQUE
For coloring an aromatic polymers, such as polystyrene, styrene/acrylonitrile copolymer (AS) and styrene/acrylonitrile/butadiene copolymer (ABS), there have been employed principally dry coloring, color compounding and masterbatch preparation. All these techniques employ a dispersant for dispersing the pigments uniformly over the polymer mass.
Japanese Patent Kokai Sho 58-103530 A discloses a dispersant for pigments for polymers based on styrene, which comprises a grafted polyolefin wax obtained by grafting a styrene-based compound onto a polyolefin wax. While this pigment dispersant excels in the performances for dispersing pigments and the like, it requires two process steps of polyolefin synthesis and grafting of styrene-based compound thereon, resulting in higher production cost. There is also a demand for a more superior pigment dispersing ability.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a dispersant for pigments for aromatic polymers which excels not only in the ability of dispersing the pigment in the aromatic polymer but also in the preservation of transparency and color stability of the resulting blended polymer compound and which can be produced by simple procedures at a low cost.
The dispersant for pigments for aromatic polymers according to the present invention comprises a wax composed of a random copolymer of ethylene and an aromatic vinyl compound, which has a content of structural unit derived from ethylene of 99-10% by weight and a content of structural unit derived from the aromatic vinyl compound of 1-90% by weight and exhibits an intrinsic viscosity of 0.04-0.6 dl/g.
The dispersant for pigments for aromatic polymers according to the present invention comprises, as an essential component, a wax of ethylene/aromatic vinyl compound copolymer. This wax is composed of a random copolymer of ethylene with an aromatic vinyl compound having a content of structural unit derived from ethylene (in the following, referred to sometimes as "content of ethylene") of 99-10% by weight, preferably 96-40% by weight, and a content of structural unit derived from the aromatic vinyl compound (in the following, referred to sometimes as "content of the aromatic vinyl compound") of 1-90% by weight, preferbly 4-60% by weight, and exhibiting an intrinsic viscosity determined in decahydronaphthalene at 135.degree. C. of 0.04-0.6 dl/g, preferably 0.1-0.4 dl/g.
In the context of this specification, the word "wax" refers to a low molecular weight polymer having a weight-average molecular weight (Mw) in the order of 1,000 to 20,000.
For the aromatic vinyl compound, there may be exemplified styrene; mono- and polyalkylstyrenes, such as, methylstyrene, dimethylstyrene and ethylstyrene; functional group-containing derivatives of styrene, such as, methoxystyrene, ethoxystyrene, vinyl benzoate, methyl vinyl benzoate, vinyl benzyl acetate, hydroxystyrene, chlorostyrene and divinylbenzene; and others including 3-phenylpropylene and 4-phenylbutene. Among these, styrene is preferred. The aromatic vinyl compound can be employed alone or in a combination of two or more thereof.
The ethylene/aromatic vinyl compound copolymer wax may further comprise, copolymerized therein, in addition to ethylene and the aromatic vinyl compound, other comonomers each having 3-20 carbon atoms, such as .alpha.-olefin(s), cycloolefin(s), polar group-containing comonomer(s) and non-conjugated polyene(s), in an amount not obstructing the purpose of the present invention.
For the above-mentioned .alpha.-olefin, there may be enumerated, for example, ethylene, propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-octene and 1-decene. As the above-mentioned cycloolefin, there may be enumerated, for example, cyclobutene, cyclopentene, cyclohexene and cyclooctene. As the polar group-con
REFERENCES:
patent: 4010006 (1977-03-01), Price
patent: 4952738 (1990-08-01), Gessell et al.
Morizono Kenichi
Sakai Hideki
Toyoda Hideo
Tsutsui Toshiyuki
Dang Thuan D.
Knode Marian C.
Mitsui Chemicals Inc.
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