JPH01306429A - Resin composition for coloring - Google Patents

Abstract

PURPOSE:To obtain a thermally stable masterbatch with a high pigment concentration, consisting of a pigment, specific PE and a pigment dispersant, such as polyolefin wax, sufficiently colorable even with a small amount thereof added and excellent in pigment dispersibility. CONSTITUTION:The objective composition consisting of (A) 10-50wt.%, pigment, (B) 5-30wt.% PE having a melt flow rate within the range of 100-500, preferably 200-400 and (C) 10-50wt.% one or more pigment dispersants selected from the group consisting of polyolefin waxes and derivatives thereof, metallic soaps (e.g., zinc stearate or magnesium stearate) and ethylenebisamide.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a resin composition (masterbatch) for coloring a thermoplastic resin.

(Conventional technology) Base resin for thermoplastic resin masterbatch.

In consideration of dispersibility into the thermoplastic resin to be colored, the same resin as the resin to be colored is generally used.

However, these masterbatches could not be used for different types of colored resins due to problems with dispersibility and deterioration of physical properties. In addition, in recent years there has been a strong demand for reducing coloring costs.
It is necessary to increase the pigment content in the masterbatch, but simply increasing the pigment content increases the viscosity of the masterbatch, making it difficult to disperse the pigment and making color unevenness more likely to appear on the surface of the molded product. Therefore, the three main components of the masterbatch (
Pigment 1 (dispersant and base resin), the content of the base resin in the masterbatch is reduced to the limit that does not interfere with the production of the masterbatch by reducing the viscosity of the base resin. Efforts have been made to improve color unevenness on the surface of molded products.
Publication No. 7-114042 proposed the use of ethylene-vinyl acetate copolymer as a base resin, but it had problems with heat resistance, and it was difficult to use when molding with a molding machine that generates a lot of frictional heat or when melt flow rate (MFR) was used. ) When molding high-density polyethylene, polypropylene, or filler-containing resin with a small diameter, uneven coloring may occur on the surface of the molded product. Also.

Even when molding was interrupted, resin remained in the molding machine, resulting in uneven coloring.

Furthermore, with conventional masterbatches, when coloring polyacecool and molding, if the temperature of the molding machine is higher than the temperature at which polyacetal is molded, it causes the generation of silver, resulting in poor productivity.

(Problems to be Solved by the Invention) The present invention improves the various drawbacks mentioned above, has versatility in a wide variety of molding conditions and resin coloring, and can obtain molded products with no unevenness in two colors, and is particularly uniform. The present invention provides a master bunch that can uniformly color even large injection molded products that are difficult to color.

[Structure of the invention]

(Means for Solving the Problems) In the present invention, as the material (a), all known dyes and pigments conventionally used for coloring resins can be used.

The base resin for component (b) has an MFR of 100~
500. Preferably polyethylene in the range of 200 to 400 is used. When MFR is less than 100, the viscosity of the masterbatch becomes high and color unevenness tends to occur.
If FR exceeds 500.

The viscosity of the masterbatch is too low, making it difficult to form the masterbatch into pellets.

(c) Polyethylene wax as fM bone dispersant.

Polyolefin waxes such as polypropylene wax and derivatives thereof, zinc stearate, magnesium stearate, and aluminum stearate.

One or more types selected from metal soaps such as calcium stearate, ethylene bisamide, etc. are used.

The proportions of (a), (b) and (c) in the present invention are 10 to 50% by weight, 5 to 30% by weight, and 10 to 30% by weight, respectively, based on the total of (a), (b) and (c). It is in the range of 50% by weight.

If the blending amount of <a) is less than 10% by weight, it is difficult to say that it is possible to color thermoplastic resins by diluting the masterbatch at a high concentration of 30 times or more, as has been the case in recent years. The fluidity of the batch deteriorates, resulting in uneven color.

If the amount of (b) is less than 5% by weight, it will be difficult to process extrusion pellets during master punch production, and if it exceeds 30% by weight, it will be useful for olefin resins such as polyethylene and polypropylene, but other than that. It loses its versatility for other resins.

When the amount of (c) is less than 10% by weight, the masterbatch has poor fluidity and uneven coloring occurs, and when it exceeds 50% by weight, it does not adversely affect the mechanical properties, heat resistance, etc. of the resin to be colored.

To the resin composition of the present invention, various additives such as antioxidants and ultraviolet absorbers can be added as long as they do not impede the effects of the present invention, and calcium carbonate, talc, finely powdered silicon oxide, etc. can also be added. lowering cost.

Can be added as a viscosity modifier.

Thermoplastic resins that can be colored with the resin composition of the present invention include polyolefin resins, EVA, EMMA, polymethylhentene, polybutene-1, polystyrene, PVC, and PET.
, PBT, ABS, AES, polyamide.

Examples include polycarbonate, polyacetal, and polyurethane. In addition, filler-containing resins or fiber-reinforced resins may be added to these resins with inorganic photo-tensifying agents such as talc, mica, barium sulfate, and calcium carbonate, glass fibers, organic fibers, metal fibers, carbon fibers, etc. .

(Example) The present invention will be explained below with reference to Examples. In the examples, 1 part means part by weight, and 2% means % by weight.

Example 1 Polyethylene "Sumi-Rikisen G-808J (manufactured by Sumitomo Chemical Industry Co., Ltd., MFR200)" 20% polyethylene wax "Sunwax 131 PJ (manufactured by Sanyo Chemical Industries, Ltd.)
50% carbon black “Mitsubishi Carbon #44” (manufactured by Mitsubishi Chemical Corporation) 3
0% The above three components were kneaded using a Ni-Goo, and then pelletized using an extruder to obtain a masterbatch.

Example 2 Instead of the polyethylene in Example 1, “Mirarin J-443” was used.
A masterbatch was obtained in the same manner as in Example 1 except that J (MFR150 manufactured by Mitsui Petrochemical Industries, Ltd.) was used.

Example 3 A masterbatch was obtained in the same manner as in Example 1 except that MFR400 (prototype) was used instead of the polyethylene in Example 1.

Example 4 Polyethylene [Sumikisen G-808J 15% polyethylene wax "Hiwax 4400GJ (manufactured by Mitsui Petrochemical Industries) 45% phthalocyanine blue""Lionol Blue POB S J (manufactured by Toyo Ink Manufacturing) 10% titanium oxide [
Tybake CR-80J (manufactured by Ishiya Sangyo ■) 30% polyethylene wax and pigment were kneaded with three rolls, then blended with polyethylene and extruded into pellets to obtain a masterbatch.

Add 3 parts of this masterbatch (D PE Hi-Zex 2
208J (MFR5, 5 manufactured by Mitsui Petrochemical Industries) 1
00 parts and molded into a bottle container, a molded product with no uneven color was obtained.

Comparative Example 1 A master bunch was obtained in the same manner as in Example 1, except that the ethylene-acetate II vinyl copolymer "Evaflex 420J (MFRI50, manufactured by DuPont Mitsui Polychemicals)" was used instead of the polyethylene in Example 1.

Comparative Example 2 Sumikasen G-807 instead of polyethylene in Example 1
A masterbatch was obtained in the same manner as in Example 1 except that MFR75 was used.

Comparative Example 3 Sumirikisen G-80820% Hiwax 4400G 20% Lionol Blue PoB5 10% Thai Bake CR-8050% A masterbatch was obtained using the above four components in the same manner as in Example 1.

Comparative Example 4 Polyethylene Sumirikisen (-808J) 4% Sunwax 131P 60% Mitsubishi Carbon 144 36% An attempt was made to make pellets in the same manner as in Example 1, but extrusion could not be made into pellets.

The masterbatches obtained in Examples and Comparative Examples 1 to 3 were added to the diluted resins listed in Table 1 at a weight ratio of 3/100, and a molding test was conducted under the conditions listed in Table 1.

In the table, the diluted resin and molding conditions are as follows.

■: High-density polyethylene Hizesox 2208J is used, and the molding machine is Raiyu 15-75 at 220℃ and 240℃.
A flat plate was molded at 2°C and color unevenness was evaluated.

■: A beer container was molded using a large molding machine using HIZEX 2208J, and color unevenness was evaluated.

■: Mix the masterbatch with polypropylene copolymer containing 10% talc, and use the molding machine Raiyu 1s-75.
Color unevenness was evaluated for molded products (flat plates) without retention at 20°C and after retention for 15 minutes.

■: Polysecure resin “Duracon M90-02”
(made of polyplastic ■) and mix the masterbatch 2
Decomposition of polyacecool due to formalin odor when extruded at 00°C.

Evaluation was made based on the appearance of silver in the molded product when a pellet extruded using 15-75 was molded.

V: ABS resin "Tallastic MHJ (specially made by Sumitomo Naugatac) and masterbatch are mixed and used" 15-7
A flat plate was molded in No. 5 and color unevenness was evaluated.

■: Polycarbonate resin [Taflon A-200J (manufactured by Idemitsu Petrochemical ■) was used, and the same molding conditions and evaluation as in ■ were performed.

■: Nylon [Diamid L-1940J (manufactured by Daicel 0 Kiku) was used, and the same molding conditions and evaluation as in ■ were conducted.

Table 1 [Effects of the Invention] The resin composition for coloring a thermoplastic resin of the present invention is as follows. It has a high pigment concentration and can provide sufficient coloring even if the amount added is much smaller than conventional master bunches, and it is not only capable of coloring a wide variety of thermoplastic resins.

It is also effective for thermoplastic resins containing inorganic fillers and fibers, and has excellent pigment dispersibility and thermal stability.

The coloring resin composition of the present invention has the drawbacks of conventional masterbatches. Molded products that generate a lot of frictional heat.

This eliminates the disadvantages of color unevenness that occurs when molding is continued after being left in the molding machine for 10 minutes or more, and of poor productivity when molding polyacetal because it must be operated at a lower molding temperature.

Claims (1)

[Claims] 1. (a) 10 to 50% by weight of pigment, (b) polyethylene with a melt flow rate in the range of 100 to 500
30% by weight, (c) 10 to 50% by weight of one or more pigment dispersants selected from the group consisting of polyolefin waxes and their derivatives, metal soaps, and ethylene bisamide. A resin composition for coloring thermoplastic resin.