CS239742B1 - Polymer soot concentrate - Google Patents

Abstract

Polymeric carbon black concentrate for coloring acrylonitrile-butadiene-styrene plastics, composed of acrylonitrile-butadiene-styrene plastics, carbon black, ethylene vinyl acetate and plasticizers, which can be used to color ABS plastics in a clear shade. The added polymer carbon black concentrate does not impair the physical-mechanical or other properties of the colored plastic. In this way, it is possible to process various types of carbon black. The produced shades fully meet customer requirements.

Description

The invention relates to a polymeric carbon black concentrate for dyeing acrylonitrile-butenedienstyrene polymers (hereinafter " IBS ").

It is known that the dyeing of heterogeneous thermoplastic materials such as ABS polymers or tough polystyrene with carbon black pigments results in a significant deterioration of the physico-mechanical properties, in particular notch and impact toughness.

This drawback is solved by the use of polymeric carbon black concentrates, where a portion of the polymer itself is mixed with the carbon black and only this concentrate is used to dye plastics. The disadvantage of these concentrates is that they are difficult to prepare, since in concentrating processes such as calendering, kneading and extrusion, a concentrate with sufficient dispersion cannot be prepared. % of the carbon black concentrate.

It is also known to use low carbon black concentrates which, however, use hardly available plastics having a lower dispersibility, such as polyvinyl acetate (AO 204 809).

? All these drawbacks are overcome by the use of a concentrate according to the invention consisting of 100 parts of an acrylonitrile-butadiene-styrene polymer type resin. 6- 80 wt. parts by weight of carbon black, 3 to 30 wt. parts by weight of ethylene vinyl acetate containing 5 to 20% vinyl acetate and 4 to 30 wt. lubricant parts.

The advantage of the concentrate according to the invention is the perfect homogenization of the carbon black in the polymer matrix. The fertilizer ingredients contained in the concentrate are commercially available on the market and have a favorable effect on the sufficient compactness of the concentrate and consequently not on the impact properties of the black-colored ABS-type polymer or the tough polystyrene.

Powdered, pearled or granulated polystyrene plastic, in particular of the ABS type, can be used to prepare the polymeric carbon black concentrate.

As carbon black, retort, channel or thermal carbon blacks or organic dyes can be used.

Ethylene vinyl acetate can be used as a modifier, preferably in fine powder form.

As lubricants, there may be used liquid lubricants such as butyl stearate, isobutyl stearate, dioctyl phthalate, medicinal oil, p-propylene glycol stearate, polypropylene oil; as solid lubricants, calcium stearate, zinc stearate, stearyl, di-stearylethylenediamide, hydrogenated, hardened animal fats & others.

The advantages of the polymeric carbon black concentrate according to the invention can be illustrated by the following examples:

Example 1

Mixture 100 wt. d. Powdered ABS polymer with 10 wt. parts of the retort carbon black were mixed in a slow-circulating mixer and then granulated ^{on an} extruder. In the various extrusion modes, regular granules could not be obtained because of pulsation and irregular extrusion.

To obtain a black colored product, 1 part of the polymeric carbon black concentrate thus prepared was mixed with 100 wt. parts of ABS powdered polymer and granulated.

Bodies were ejected from the granules to assess the physico-mechanical properties. The values are given in Table 1.

1 and d 2

According to Example 1, a polymeric carbon black concentrate was prepared except that 5 wt. parts by weight of ethylene vinyl acetate and 8 wt. parts of butyl stearate.

The mixture thus prepared could be extruded well, the granules having a regular shape. The properties of the black pigmented granulate using this concentrate are listed in Table 1.

Example 3

The procedure of Examples 1 and 2 was repeated except that 30 wt. parts of carbon black, 20 wt. parts by weight of ethylene vinyl acetate and 15 wt. parts of butyl stearate. The concentrate granulate had a regular shape.

hm. d. of this concentrate was mixed with 100 wt. parts of ABS powdered polymer. The properties of the black pigmented ABS granulate prepared using this concentrate are shown in Table δ. 1.

Example

The procedure of the previous examples was repeated with the difference that 80 wt. parts of carbon black, 30 wt. parts by weight of ethylene vinyl acetate and 30 wt. parts of butyl stearate. The concentrate granulate had a regular shape.

One part by weight of this concentrate was mixed with 100 wt. d. ABS ABS. polymer. The properties of the black pigmented ABS granulate prepared using this concentrate are shown in Table 1.

Claims (3)

SUBJECT OF THE INVENTION Polymeric carbon black concentrate for dyeing acrylonitrile-butadiene-styrene polymers, characterized in that it consists of: 100 parts by weight of an acrylonitrile-butadiene-styrene polymer type resin, 6-80 parts by weight dream i, 3- 30 parts by weight of an ethylene vinyl acetate copolymer with a vinyl acetate content of 5-20%, 4- 30 parts by weight of lubricant.