JPH0782424A - Master batch composition - Google Patents

Abstract

PURPOSE:To provide a master batch composition kneadable at relatively low temperatures, capable of homogeneously dispersing thermally instable additives or additives of low melt viscosity therein, excellent in dispersion stability, useful for plastics, etc., comprising an additive for plastics and amorphous polyolefins. CONSTITUTION:This composition can be obtained by incorporating (A) 100 pts.wt of amorphous polyolefins composed of propylene and ethylene etc., with (B) pref. 5-100 pts.wt. of an additive for plastics such as a colorant or cross- linking agent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a masterbatch composition containing various plastics, in particular, additives used for polyolefin resins such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer and ethylene-propylene rubber. .

[0002]

2. Description of the Related Art Generally, when an additive is added to a plastic material, it is widely practiced to add a relatively high concentration masterbatch composition of the additive made of the same base material to a natural material. In the polyolefin resin, in order to impart a new function, a crosslinking agent, a softening agent, a filler,
A masterbatch composition prepared in advance from the same polyolefin resin containing a relatively high concentration of an additive such as a release agent is added to a natural material (polyolefin). At this time, when the polyolefin resin is kneaded with a foaming agent, a modifier, a cross-linking agent, etc. at a high temperature, these additives cause a chemical change, and there is a drawback that foaming, cross-linking, decomposition and graft reaction occur. In particular, additives such as antibacterial / antifungal / insecticide, flame retardant, foaming agent, deodorant, etc. are exposed to high temperatures during melt processing of polyolefin resin, and these chemicals or additives evaporate / sublime and become active ingredients. However, there was a drawback that it was greatly reduced. In addition, additives such as lubricants, antistatic agents, heat stabilizers, and ultraviolet absorbers, which have a lower melting point than polyolefin resins, have a low melt viscosity and cannot be sufficiently kneaded in an extruder. was there.

[0003]

The present invention relates to a masterbatch composition for plastics containing a chemical or an additive which is thermally unstable or has a low melt viscosity.
An object of the present invention is to provide a masterbatch composition in which the loss of the active ingredient of the additive is suppressed and which is uniformly dispersed.

[0004]

The present inventors have solved the above problems by providing a masterbatch composition for plastics comprising an additive for plastics and an amorphous polyolefin.

In the present invention, by using an amorphous polyolefin as a base material of an additive for plastics, the additive can be melt-kneaded at a low temperature, so that the loss of the active ingredient due to the heat of the additive is prevented. Further, since the base material has a low melt viscosity, a low-viscosity additive can be uniformly dispersed.

The amorphous polyolefin in the present invention is a copolymer of propylene and ethylene or butene-1 using a special catalyst and has a number average molecular weight of 1,000.
It is preferable that the ethylene content is in the range of up to 20,000 and the ethylene content is less than 2 to 8% by weight or the butene-1 content is less than 30 to 50% by weight. When the number average molecular weight is less than 1,000, the cohesive force is too low to maintain the shape of the masterbatch composition, and when it is 20,000 or more, the melt viscosity is too high and the additive is uniform. It becomes difficult to produce a masterbatch composition dispersed in the composition. When the ethylene content is 8% by weight or more or the butene-1 content is 50% by weight or more, the surface tackiness of the amorphous polyolefin increases, and the handling of the masterbatch composition becomes complicated. When the ethylene content is 2% by weight or less or the butene-1 content is 30% by weight or less, the compatibility with a general polyolefin resin decreases, and it becomes difficult to uniformly disperse the masterbatch composition in the polyolefin resin. The apparent viscosity of amorphous polyolefin is from room temperature to about 60 ° C.
10 ³ to 10 ¹⁰ centipoise, preferably 10 ⁶ to 10
It is preferably ⁷ centipoise.

The plastic in the present invention is a polyolefin resin such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene propylene rubber and the like, polyamide, thermoplastic polyester, ABS, polystyrene and the like, and among these, particularly polyolefin. Resins are preferred. Amorphous polyolefin as a base material for use in plastics other than polyolefin-based resins or to improve compatibility with additives such as maleic acid, itaconic acid, fumaric acid, and maleic anhydride, itaconic anhydride, etc. An amorphous polyolefin modified with a known polyolefin modifier composed of an unsaturated acid and derivatives thereof can be used. This modification can also be performed by adding a modifier, a peroxide, etc. at the same time as kneading other additives.

The additives for plastics of the present invention include:
Colorants, cross-linking agents commonly used for plastics,
Not only softeners and release agents, but also antibacterial / antifungal / insecticide, flame retardants, foaming agents, deodorants, lubricants, antistatic agents, heat stabilizers,
It is particularly preferable to use a plastic such as an ultraviolet absorber that deteriorates, evaporates or sublimes in a high temperature atmosphere lower than the molding temperature or melting point of the plastic, has a low melt viscosity, and is difficult to knead with the substrate.

Specific examples of the additives include a cross-linking agent and a decomposing agent, t-butyl peroxybenzoate, 2.5 dimethyl 2.5 dibutyl peroxy hexane, 1.3-bis (t-butyl peroxyisobrovir). )benzene,
2.2 Organic peroxides such as 2-asobisisobutyl nitrile are mentioned. Examples of the antibacterial / antifungal / insect repellent include compounds such as thiosulfamide, thiophthalimide, biszenoxyarsine, thiabetasol, aminobenzimidazole and derivatives thereof. Examples of the flame retardant include compounds such as antimony oxide, organic phosphoric acid ester, chlorendic acid, tetrapromophthalic anhydride, and polyol containing phosphorus or halogen. Examples of the foaming agent include compounds such as dinitrosotetramine, azodicarbonamide, azobisisobutylnitrile, sulfonyl hydrazide, and sulfonyl semicarbazide, and their derivatives.

The concentration of the above-mentioned various chemicals or additives contained in the masterbatch is preferably 5 to 100 parts by weight with respect to 100 parts by weight of the amorphous polyolefin of the base material. When the amount is less than 5 parts by weight, it is more effective to directly mix with the polyolefin resin without actually passing through the masterbatch. On the other hand, if it is more than 100 parts by weight, the kneading at the time of extrusion becomes insufficient and it becomes difficult to obtain a uniform masterbatch composition. As a machine for producing the masterbatch composition, generally used single-screw, twin-screw extruders, feeders and the like can be used. The cylinder temperature is 15 to 150 ° C., preferably 20 to 80 ° C., although it depends on the kind and amount of the additive.

[0011]

According to the present invention, by using an amorphous polyolefin as a masterbatch composition substrate,
In particular, there is little loss of additives that are thermally unstable or have a low melt viscosity, and it is possible to obtain a uniformly dispersed masterbatch composition for plastics.

[0012]

The present invention will be described in more detail below.

Example 1 Using a 30 mmφ twin-screw extruder, a foaming agent and an amorphous polyalphaolefin (Ubetack: U manufactured by Ube Lexen Co., Ltd.) were used.
T2180 ") was prepared. As a foaming agent, toluene sulfonyl hydrazide (“Unihole H” manufactured by Eiwa Chemical Co., Ltd.) was used as the base material 100.
50 parts by weight with respect to parts by weight was dry-blended, and the extruder was set at a cylinder temperature of 50 ° C. and extruded at a discharge rate of 20 kg / hour. Observation of the pellets with an optical microscope showed no formation of bubbles due to the decomposition of the foaming agent, and there was no lump of the foaming agent having a size of more than 50 microns, and the masterbatch composition was uniformly dispersed. It was confirmed that was obtained. Furthermore, this pellet was made into crystalline random polypropylene (“B301H” manufactured by Ube Industries, Ltd., melting point = 145 ° C., MF
R (230 ° C) = 0.8) 10 parts by weight dry blended with 100 parts by weight and set to 250 ° C for 300 m
A 300-micron thick foamed sheet was molded by an m-width T-die sheet molding machine. The expansion ratio at this time is 2.5
It was twice, and it was confirmed from the optical microscope of the cross section of the sheet that the entire surface of the sheet was uniformly foamed.

Example 2 Using a 65 mmφ feeder ruder (manufactured by Moriyama Seisakusho), a masterbatch composition containing a lubricant and an amorphous polyalolefin (“Ubetack: UT2780” manufactured by Ube Lexen) as a base material was manufactured. As a lubricant, oleic acid amide ("Diamid O" manufactured by Nippon Kasei Co., Ltd. was used as a base material 100.
Dry blending 40 parts by weight with respect to parts by weight, setting the temperature of the kneading part of the feeder ruder to 40 ° C., and discharging amount to 30
Extruded at kg / hour. The masterbatch composition discharged from the nozzle of the feeder ruder was pelletized by the underwater cutting method. When the pellets were observed with an optical microscope, it was confirmed that there were no lumps of secondary agglomerates of lubricant having a size of more than 100 microns, and that a uniformly dispersed masterbatch composition was obtained. Further, the pellets were made into a low-density polyethylene (“J1019” manufactured by Ube Industries, Ltd., melting point = 105 ° C., MI (19
(0 ° C.) = 10) 5 parts by weight of 100 parts by weight were dry-blended, and a film having a thickness of 50 μm was formed by a die sheet forming machine with a 300 mm width T set at 200 ° C. The surface lubricity of this film was good.

Comparative Example 1 As in Example 1 except that crystalline random polypropylene (“B301H” manufactured by Ube Industries, Ltd.) was used as the base material of the masterbatch and the preset temperature of the cylinder of the extruder was 220 ° C. A blowing agent masterbatch composition was similarly prepared. It was found that the pellets of the obtained masterbatch composition had remarkable rough skin, and a part of the foaming agent had already been decomposed. Further, the pellets were mixed with the same crystalline random polypropylene (“B301H” manufactured by Ube Industries, Ltd.) 100
250 parts by dry blending 10 parts by weight with respect to parts by weight
A foamed sheet having a width of 300 mm and a thickness of 300 μm was formed by a die sheet forming machine set at 300 ° C. However, since a part of the foaming agent had already been decomposed, the expansion ratio was considerably reduced to 1.5 times.

Comparative Example 2 As in Example 1 except that crystalline random polypropylene (“B301H” manufactured by Ube Industries, Ltd.) was used as the base material of the masterbatch and the temperature of the extruder cylinder was set to 140 ° C. Similarly, a foaming agent masterbatch composition was produced. However, the torque required for kneading became excessive, the motor current of the extruder exceeded the set value, and the extruder stopped.

Front page continuation (72) Inventor Yoshitaka Okada 3-1 Chikko Shinmachi, Sakai City, Osaka Prefecture, Ube Industries Co., Ltd. Sakai Factory (72) Inventor Takaya Sakaguchi, 3-1, Chikko Shinmachi, Sakai City, Osaka Prefecture

Claims (1)

[Claims] 1. A masterbatch composition for plastics comprising an additive for plastics and an amorphous polyolefin.