JPS58118827A - Pelletized colorant for thermoplastic resin - Google Patents

Abstract

PURPOSE:To provide the titled colorant excellent in dispersibility and color density free from fear of scattering, and easy to handle, by pelletizing a mixture of dyes or pigments, metallic salts of higher fatty acids, and low-melting resinous matter. CONSTITUTION:100pts.wt. dye or pigment (e.g., titanium dioxide, carbon black), about 5-150pts.wt. metallic salt of higher fatty acid (e.g., zinc stearate, aluminum stearate), and about 5-150pts.wt. low-melting resinous matter (e.g., low MW polyethylene) are mixed homogeneously in a mixer, melted, cooled, and crushed to form a powder. Then the resulting powder is heated and granulated by an extrusion granulator, etc. to yield the intended pelletized colorant. The obtained colorant is well suited for coloring polyethylene, polypropylene, polyvinyl chloride, and the like.

Description

[Detailed Description of the Invention] The present invention is a coloring agent for thermoplastic resins, which has components consisting of dyes and pigments, metal salts of higher fatty acids, and low-melting point resinous substances, and is in the form of pellets. The object of the present invention is to provide a pigment that is significantly superior in terms of dispersibility and color density.

Traditionally, as a type of colorant for coloring thermoplastic resins,
! There are star patches, dry colors and liquid colors, and the dry colors are! ? ! Pigment (40-80%) and dispersion aid (metal soap, wax, etc. 20-60%)
), mixed and pulverized powder (this is further granulated in some cases), and is inexpensive and widely used, but molding manufacturers are concerned about the weighing of dry colors and the time of mixing. The scattering nature of the colorant is a problem, and its handling is inconvenient.

On the other hand, Master Patch contains pigment in resin at a high concentration (5 to 5
0%), and the pigment concentration is generally lower than that of dry color, and the manufacturing process is long and complicated, and the coloring cost is higher than that of dry color. Liquid colors are becoming more popular because they are easy to change colors and automatically measure and mix.
The pigment is dispersed in a high concentration, but as a result of repeated research to solve the problem of removing the organic liquid used, it has a pigment concentration equivalent to dry color, high dispersibility, A coloring agent that is non-contaminating, has excellent automatic metering properties, and is convenient to handle has been obtained.The gist of the present invention is to obtain a coloring agent that is non-contaminating, has excellent automatic metering properties, and is convenient to handle. The coloring agent is made of a resin-like substance, and the coloring agent is particularly in the form of pellets.

The present invention will be explained in detail below.

The dyes and pigments used in the present invention include all conventionally known inorganic pigments, organic pigments, dyes, extender pigments, and the like. In addition, the metal plate of higher fatty acid used in the present invention has a melting point of 1.
Those having a temperature of 65° C. or lower are preferred, and specific examples thereof include zinc stearate, magnesium stearate, aluminum stearate, calcium stearate, and zinc lafricate.

Furthermore, the low melting point resinous material used in the present invention is, for example, a molecular weight of about 1,500-6,000 and a molecular weight of about 80-130"C.
It is a low molecular weight polyalkylene having a softening temperature of
Low molecular weight polyethylene known under trade names such as Sunwax (manufactured by Mitsui Petrochemicals) is a preferred layer.

The ingredients used in the present invention are the above-mentioned three ingredients, but in addition to these ingredients, there are various types of antioxidants, foaming agents, flame retardants, ultraviolet absorbers, antistatic agents, etc. that are used in conventional colorants. Additives are free to be used as needed.

Next, a method for producing the colorant of the present invention will be explained.

' It is a mixture of the first step dye and pigment and the necessary components, and the blending ratio is about 50 to 15 parts by weight of metal salts of higher fatty acids per 100 parts by weight of dye and pigment.
0 parts by weight and about 10 to 150 parts by weight of the low melting point resinous material are preferred ranges. These are homogeneously triblended using a high-speed mixer, and then heated and melt-mixed in a Henschel mixer to form a single granule, or melt-mixed, then cooled and crushed to form a powder processed dye and pigment.

Second step The processed dye and pigment powder obtained above is heated and granulated using a granulator such as an extrusion granulator.
A clean pelleted colorant having a fine particle layer of 5 m, preferably about 15 to 31) tm is obtained.

The thus obtained pelleted colorant of the present invention can be used for all kinds of coloring purposes, and its main uses include polyethylene, polypropylene, polystyrene, as well as dry colors, colored pellets, color masterbatches, etc.
Coloring of thermoplastic synthetic resins such as polyvinyl chloride, polyvinylidene chloride, polyacrylic esters, AS copolymers, ABS copolymers, polyamides, polyesters, and EVA. As already detailed, the pellet coloring agent of the present invention sufficiently solves the drawbacks of conventional dry colors, and its non-staining properties, ease of handling, etc. are similar to color masterbatches, etc. There is also no thermal history problem that occurs with masterbatches or colored pellets. In particular, since the colorant of the present invention is in the form of pellets, there is no fear of scattering and it is very suitable for automatic metering.

Examples are given below.

<Example 1> 100 parts by weight of titanium oxide, 75 parts by weight of AC polyethylene muro, and 10 parts by weight of calcium stearate were placed in a high-speed mixer with a capacity of 101, and the number of revolutions was 80 O.
r, mix for 2 minutes at door 0m. Then, the rotational speed of the high-speed mixer was increased to 1000 rpm, the walls of the mixer were heated with steam (100° C.), and mixed for 15 minutes to form a mixture of 111 particles. This mixture was heated and granulated using a single screw extruder to obtain a white colorant in the form of pellets. 2 parts by weight of this colorant and 100 parts by weight of uncolored polyethylene resin pellets were mixed in a tumbler for 2 minutes, and then formed into a film using an inflation device, resulting in a colored film with uniform pigment dispersion.

<Example 2> 100 parts by weight of carbon black, AC polyethylene 75
A black pellet coloring agent was obtained in the same manner as in Example 1 using parts by weight.

05 parts by weight of this colorant and 100 parts by weight of uncolored polystyrene resin
parts by weight and injection molded according to a conventional method to obtain a uniformly colored flat plate. On the other hand, a colored flat plate was obtained in the same manner as described above using a dry color consisting of Rikiichimu 7 Bonplak and a metal soap, uncolored polystyrene and dry blended so as to have the same pigment concentration as the colored flat plate.

When compared with the case where the pellet-shaped colorant according to the present invention was used, it was confirmed that the pigment fractionality and coloring density were significantly superior.

<Example 3> 100 parts by weight of phthalocyanine blue, 100 parts by weight of AC polyethylene 6A, magnesium stearate 13
A blue pellet coloring agent was obtained in the same manner as in Example 1 using 0 part of hoeing. When 1 part by weight of this colorant was mixed with 100 parts by weight of an uncolored polypropylene resin and extrusion molded according to a conventional method, a uniformly and beautifully colored Hanako vibe was obtained.

Patent applicant: Hamasaki Sangyo Co., Ltd.
118827 (3) Procedural Amendment (Voluntary)], Table of Case Small Patent Application No. 2043 No. 2 of 1982, Issued
Bullet-shaped coloring agent for Atsushi-machi oil with the name of Ming 3 Relationship with the case of the person making the amendment Patent applicant Hamasaki Sangyo Ajishiki Company 4 Agent 8577 5 Date of notice of reasons for refusal (date of amendment order) 6 Subject of correction as shown in the attached sheet °'X−゛2,' /
7. Contents of the amendment il) In the 4th column of the specification, line 11, it is stated that “approximately 50 to 150
Parts by weight: approx. 10'' t-r approx. 5-150
Weight part.

Corrected as "Low melting point resinous material 5".

, 2) "75 parts by weight" on page 6, line 1 of the specification is replaced with "
20 parts by weight”.

13, page 6, page 16, the phrase "75 parts by weight" is corrected to "75 parts by weight and 75 parts by weight of magnesium stearate."

Claims (1)

[Claims] 1. A pellet coloring agent for thermoplastic resins, which is composed of dyes and pigments, metal salts of higher fatty acids, and low-melting point resinous substances, and is pellet-shaped.