JPS5949268A - Pigment composition - Google Patents

Abstract

PURPOSE:To obtain titled composition with markedly improved heat resistance, by incorporating an organic pigment with a silane coupler-treated inorganic filler in a specific proportion. CONSTITUTION:The objective composition can be obtained by incorporating (A) 100pts.wt. of an organic pigment (e.g. of phthalocyanine type) with (B) about 1-100pts.wt. of an inorganic filler (consisting chiefly of Al2O3 and/or SiO2, e.g., clay) treated with a silane coupling agent (e.g., vinyl trimethoxysilane) and further, if required, (c) dispersant (e.g., metallic soap from higher fatty acid), carrier resin (e.g., polyethylene), etc. USE:For coloring in the kneading of various plastics in molten state.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pigment composition, and more specifically, it is an object of the present invention to provide a pigment composition containing an organic pigment as a main component and having significantly improved one-plane thermal properties.

Conventionally, organic pigments have been used for various purposes, but in the case of melt cross-coloring of various plastics, etc., especially when the melting temperature is high and a relatively long time is required, organic pigments are used during the coloring process. A heat resistance problem arises in that it decomposes. For example, when coloring polyolefin resin for electric wire coating at the same time as coating the electric wire, use phthalocyanine pigments, quinacridone pigments, polyazo pigments, isoindolinone pigments, etc., which are said to have relatively good heat resistance. However, during continuous operation at high temperatures for long periods of time, some of the organic pigments thermally decompose, and the resulting carbides gradually adhere to and accumulate on the inner wall of the extrusion die tip.
This causes a serious drawback in that it causes roughness called "streaks" on the surface of the covered wire.

As a result of intensive research to solve the above-mentioned drawbacks of the conventional technology, the inventors of the present invention have found that by blending a specific inorganic light filler into an organic pigment, the heat resistance of the organic pigment can be improved, although the reason is completely unknown. The present invention was completed based on the finding that the invention is significantly improved and the drawbacks of the prior art as described above are fully resolved.

That is, the present invention comprises an organic pigment and an inorganic filler treated with a silane coupling agent, and the filler has improved heat resistance when present in an amount of about 1 to 100 parts by weight of Wη per 100 parts by weight of the organic pigment. It is a pigment composition.

To explain the present invention in detail, the organic pigment used in the present invention may be any conventionally known organic pigment, but particularly effective ones are organic pigments used for melt-mixing coloring of various plastics, such as phthalocyanine. organic pigments such as quinacridone-based, monoazo-based, disazo-based, polyazo-based, and isoindolinone-based pigments.

The inorganic fillers used in the present invention include titanium oxide, zinc white, lithopone, precipitated barium sulfate, precipitated calcium carbonate, alumina white, white carbon, clay, talc, lilysodium earth, acid clay, White pigments and extender pigments such as activated clay, mica, sericite, volasnite, etc., which are effective in 'h, and clay, talc, silica, alumina, etc., as their main components 5102 and/or Aj! , 203 as the main components. Such an inorganic filler is used after being treated with a silane coupling agent.

As the silane coupling agent, any conventionally known silane coupling agent can be used, for example, one having the general formula Rn5I24.

(n is an integer of 1 to 3, 2 is an alkoxy group having 1 to 6 carbon atoms, R is an epoxy group, an amino group, an amide group, a mercapto group, or an organic residue having a double bond) γ-aminopropyltriethoxysilane, r-(2-amineethyl)aminopropyltrimethoxysilane, r-ureidopropyltriethoxysilane, γ-mercaptoglobiltrimethoxysilane, r
-glycidoxyprobyltrimethoxysilane, β-(3
, 4-epoxycyclohexyl)ethyltrimethoxysilane, r-chloropropyltrimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris(2-methoxyethoxy)silane, vinyltriacetoxysilane, γ-methacryloxyglobiltrisilane Methoxysilane and the like, among which a vinyl group-containing silane coupling agent gives particularly good results.

Treatment of inorganic fillers with silane bubbling agents:
By any method, for example, a silane coupling agent or its solution is added to the inorganic filler at a ratio of about 0.1 to 20 parts of the silane coupling agent per 100 parts by weight of the inorganic filler, and both are sufficiently mixed. Any method can be used, such as mixing the pigment, adding the silane coupling agent after mixing the pigment, filler, and other necessary components, or adding the silane coupling agent during the production of a masterbatch for synthetic resins. good.

The pigment composition of the present invention consists of the above-mentioned essential components, but when used for coloring various plastics, various dispersants (for example, higher fatty acid metal soaps, waxes, etc.) may be added. It can take the form of a dry color, a liquid color containing a vehicle, a granular color with or without a binder, and a color masterbatch kneaded with various carrier resins (eg, polyethylene, PVC, etc.).

The normal phase composition of the present invention as described above can be used for all kinds of coloring purposes, but in particular for applications requiring heat resistance, such as melt-kneading coloring of various plastics, in particular,
When polyolefin resin for electric wire coating is used as a coloring agent to coat and color electric wires at the same time, there is almost no thermal decomposition of the organic pigment, so even during continuous work at high temperatures for long periods of time, the coating can be done! # No problem of rough skin on the clothing surface.

Next, the present invention will be specifically explained with reference to Examples. Note that the text in the middle of the sentence or ``chi'' is based on the 1st grade standard.

Example 1 20 parts of ethanol containing 5 parts of vinyltrimethoxysilane were added to 100 parts of finely powdered clay while stirring at high speed.
After high-speed mixing for a minute, the ethanol was evaporated to obtain the silane coupling agent-treated filler (I).

Example 2 The following silane coupling agent treated filler was obtained in the same manner as in Example 1.

If
Almira White 100 parts 10 vinyl tri-I setoxysilane 5 parts old... Kin White Carbon 100 parts 10 r-glycidoxyglobil trimethoxysilane 5 bonds...
...Example 3 Monoazo facial sting (red) 100 parts and treated filler I2
0 parts was mixed in a super mixer for 5 minutes, and 120 parts of the resulting composition and 120 parts of polyethylene wax were heated and kneaded with a triple roll to obtain 240 parts of a colorant.

10 parts of the colorant and 1 part of low density polyethylene (M-I=2)
00 parts by heating and kneading with two rolls to obtain a red colored resin (
A-1) was obtained.

Example 4 Fillers from Examples 1 and 2, organic pigments below, 1)
The colored resins (8-2 to A-7) shown in the table below were obtained using the following resins.

Filler Pigment Resin Colored Resin I Monoazo Red High Density Polyethylene A-2E Polyazo Yellow Low Density Polyethylene A-3I Phthalocyanine Blue
〃A-3■ Quinacridone Violet 〃A-4■ Inoindolinone Yellow 〃A-5■ Phthalocyanine Green Low Density Polyethylene A-6■ Polyazo Red A-7 Comparative Example 1
~7 Comparative colored resins B-1 to B-7 of the same color were obtained in the same manner as in Examples 3 to 4, except that the silane coupling agent-treated filler was not used.

Example 5 Using the above colored resins A-1 to A-7 and B-1 to B-7, respectively, 240 to
After staying at 300° C. for 0.10.20.30 minutes, the molded plate was punched out, and the discoloration of the colored plate was compared with that of the colored plate after 0 minutes, and the results shown in Table 1 below were obtained.

In addition, among the numbers in the table, the one with 0 minutes is considered the standard (5), 5 means no discoloration or fading is observed compared to the standard, 4 means almost no discoloration is observed, and 3 means no discoloration is observed. , Slight discoloration and discoloration are observed, 2 indicates that slight discoloration and discoloration are observed, and 1 indicates that the color tone of the pigment is lost and the discoloration and discoloration are significant.

Example 6 A composition (Shu) is prepared by heating and kneading 100 parts of a yellow polyazo pigment (Chromonotaru Yellow 3G, Ciba Geigy), 20 parts of filler I, and 100 parts of low molecular weight polyethylene using a three-roll roll.
100 parts of low molecular weight polyethylene is added to 10 parts of titanium oxide, and 50 parts of low molecular weight polyethylene is added to 10 parts of titanium oxide to uniformly prepare compositions (Bl and (C). (A) 15
8 parts of (B) and 33 parts of (c) were heated and kneaded with 44 parts of low-density polyethylene using two rolls to obtain a green coloring agent of the present invention.

Example 7 A green colorant was obtained in the same manner as in Example 6, except that high-density polyethylene was used instead of low-density polyethylene.

Example 8 100 parts of yellow isoindolinone pigment (Ciba Geigy), 10 parts of filler I and low molecular weight polyethylene 1'O
8 parts of the composition (D) prepared from part O and 40 parts of (C) were heated and kneaded with 52 parts of low-density polyethylene using two rolls.
A yellow coloring agent of the present invention was obtained.

Example 9 100 parts of yellow polyazo pigment (Chromophthal Yellow 6G, Ciba Geigy) was filled with jf4. Wl, l m t
Part s, 5 parts of a composition (E) made from 100 parts of low molecular weight polyethylene, 11 parts of a composition (F) made from 100 parts of Bengara and 50 parts of low molecular weight polyethylene, (C) 3
2 parts of low-density polyethylene and 52 parts of low-density polyethylene were heated and kneaded with two rolls to obtain the brown colored side of the present invention.

Example 10 A composition (G) is prepared from 100 parts of a red pigment (Dupont), 20 parts of a filler and 80 parts of low molecular weight polyethylene. (G) 20 parts and 80 parts of low-density polyethylene were heated and kneaded with two rolls to obtain a red coloring agent of the present invention.

Comparative Examples 8 to 12 Actual Mn Example 6 except that no filler was used
Comparative colorant 5-1 was obtained in the same manner as in 10.

Actual Mli Example 11 The colorants of Examples 6 to 10 and Comparative Examples 8 to 12 were mixed with 14 (
Fabric) Mixed with twice as much low-density polyethylene as 6 for covering electric wires.
Using a 51 extruder at a resin temperature of 250°C, a 0.51 mm thick wire was coated with a thickness of 0.15 mm for 24 hours, and the coating type and appearance of the wire were observed, and the results shown in Table 1. Obtained.

Table 2 Example 12 A coloring agent similar to that of Example 6 was obtained by using filler V in place of filler (1) of Example 6, and the same results as those of Example 11 were obtained.

Claims (4)

[Claims] (1) Pigment composition with good heat resistance, consisting of an organic pigment and an inorganic filler treated with a silane coupling agent, in which the filler is present in a ratio of about 1 to 100 parts by weight per 100 parts of the organic pigment. thing. (2) The inorganic filler is At203 and / Amadaha 5i
Claim No. 1, which is a filler containing O2 as a main component.
). (3) The composition according to claim (1), wherein the silane coupling agent is a vinyl group-containing silane coupling agent. (4) The composition according to claim (1), further comprising a dispersant and a carrier resin.