JP2869958B2 - Colorant composition for vinylidene chloride resin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a colorant composition for vinylidene chloride resin. More specifically, the present invention relates to a vinylidene chloride-based resin colorant composition that does not contaminate the inside of a coloring mixer and can uniformly disperse a pigment in the vinylidene chloride-based resin.

[0002]

2. Description of the Related Art Conventionally, as a method of coloring a vinylidene chloride resin, a method of directly adding a pigment to the vinylidene chloride resin or a method of kneading the pigment with a liquid material used as a plasticizer of the vinylidene chloride resin is used. A method of adding the obtained paste-type colorant to a vinylidene chloride-based resin is known.

[0003]

However, when a pigment is directly added to a vinylidene chloride-based resin for coloring, the pigment is insufficiently dispersed in the resin, resulting in color spots on a final molded article such as a film. In addition, there are problems that lines, streaks, pinholes, and the like are easily generated, and that coloring is not stable. Further, the inside of the mixer used for coloring the vinylidene chloride-based resin is severely contaminated, so that there is a problem in handleability such as not being suitable for automatic weighing.

In the method of adding the paste type colorant to the vinylidene chloride resin, the pigment can be sufficiently dispersed in the resin, but the colorant is difficult to handle and is difficult to handle. In addition, it is difficult to increase the pigment content to a high concentration, and there is also a problem in storage stability. Further, the inside of a mixer used when mixing the resin and the paste type colorant to color the vinylidene chloride resin is severely contaminated.

In general, a masterbatch obtained by adding a pigment at a high concentration together with a plasticizer and a stabilizer to the same resin as the resin to be colored together with a plasticizer and a stabilizer, kneading with heat, and then pelletizing or pulverizing the resin is known. I have. When mixing such a masterbatch and resin, there is no contamination inside the mixer as described above. In addition, since the pigment is highly dispersed in the resin during the production of the master batch, the dispersibility of the pigment in the resin to be colored is good. However, when a masterbatch is prepared using a vinylidene chloride-based resin, the resin has low heat resistance and requires heating in the step of kneading the resin and the pigment, so that the resin is easily decomposed, Batch production is extremely difficult.

Accordingly, an object of the present invention is to provide a vinylidene chloride-based resin colorant composition which does not contaminate the inside of a mixer used for coloring a vinylidene chloride-based resin and has good pigment dispersibility. To provide.

[0007]

The above object is achieved by the present invention described below. That is, the present invention is a colorant composition for a vinylidene chloride-based resin, which is obtained by mixing a pigment with a polystyrene-based resin having a weight average molecular weight in a range of 10,000 to 90,000.

[0008]

The colorant composition of the present invention can increase the pigment concentration because the pigment is dispersed in the polystyrene resin.
Further, by using the colorant composition of the present invention, since the form is granular, flake or powder, without contaminating the inside of the mixer used when coloring the vinylidene chloride resin, It is extremely easy to clean the inside of the mixer after removing the resin after coloring from the mixer. Further, since the colorant composition itself of the present invention is a highly dispersed pigment in the resin, the dispersibility of the pigment in the vinylidene chloride-based resin is also extremely good.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in more detail with reference to preferred embodiments. Colorant composition of the present invention,
Contains polystyrene resin and pigment. The polystyrene resin used in the present invention includes, for example, polystyrene resin, styrene-acrylate copolymer resin, styrene-methacrylate copolymer resin, and styrene-acrylate-methacrylate copolymer resin. And one of the resins selected from these resins.
Species or two or more can be used.

The acrylate component of the styrene-acrylate copolymer resin and the styrene-acrylate-methacrylate copolymer resin includes methyl acrylate, ethyl acrylate and butyl acrylate. No. Examples of the methacrylate component of the styrene-methacrylate copolymer resin and the styrene-acrylate-methacrylate copolymer resin include methyl methacrylate, ethyl methacrylate, and butyl methacrylate.

The molecular weight of the polystyrene resin used in the present invention is preferably in the range of 10,000 to 90,000 on a weight average. When a colorant composition is made of a polystyrene resin having a weight average molecular weight of less than 10,000, it is difficult to pulverize the colorant composition, and even if pulverized, the melting point is low. Problems such as contamination of the interior of the mixer used in the process. Further, when a colorant composition is prepared from a polystyrene resin having a weight average molecular weight of more than 90,000, problems such as poor dispersibility of the colorant composition in a vinylidene chloride resin occur.

The colorant composition of the present invention can contain a plasticizer if necessary. When a plasticizer is required, any commonly known plasticizer can be used as the plasticizer. However, since the phthalate-based plasticizer has an action of dissolving the polystyrene resin, the obtained coloring agent can be used. It is not preferable because problems such as blocking of the agent may occur. When using a plasticizer, the amount used varies depending on the polystyrene resin or pigment used,
The amount is preferably 1 to 55 parts by weight based on 100 parts by weight of the polystyrene resin. If the amount of the plasticizer exceeds 55 parts by weight, it is difficult to pulverize the colorant, and even if pulverized, the colorant powder tends to be agglomerated, contaminating the interior of the mixer used for coloring, and However, automatic measurement becomes difficult, which is not preferable.

The pigment used in the present invention may be either an organic pigment or an inorganic pigment. For example, azo pigments, phthalocyanine pigments, titanium oxide, carbon black, red stalks and the like can be mentioned, but the present invention is not limited to these. The amount of these pigments is arbitrary, but is preferably about 30 to 150 parts by weight, more preferably 50 to 100 parts by weight, per 100 parts by weight of the polystyrene resin. Incidentally, additives such as a lubricant, a dispersant or a resin stabilizer may be further added to the colorant composition of the present invention, if necessary.

The colorant composition for vinylidene chloride-based resin of the present invention is prepared by sufficiently heating and mixing the above-mentioned compound comprising a polystyrene-based resin, a plasticizer, a pigment and other additives according to a conventional method, and after cooling and solidifying. Obtained by grinding.

[0015]

Next, the present invention will be described more specifically with reference to examples and comparative examples. In the following description, “parts” are based on weight unless otherwise specified.

Example 1 Polystyrene resin (weight average molecular weight: 65,000) 10
0 parts, epoxidized soybean oil [ADEKA SIZER O-130
P: Adeka Argus Chemical Co., Ltd.] 10 parts, montan wax [Hoechst E wax: Hoechst Japan Ltd.]
10 parts) and 80 parts of copper phthalocyanine blue [Chromofine Blue SR5020: manufactured by Dainichi Seika Kogyo Co., Ltd.] with a 10-liter Henschel mixer.
Remove the mixture at 20 ° C. The mixture is then added to 150
The mixture is uniformly kneaded with three rolls at ℃. After cooling and solidifying the obtained mixture, the mixture is pulverized by a pulverizer to a nominal size of 500 μm
(30 mesh) through a sieve to obtain a powdery colorant composition of the present invention.

Example 2 A powdery colorant composition of the present invention was prepared in the same manner as in Example 1 except that a polystyrene resin having a weight average molecular weight of 46,000 was used instead of the polystyrene resin used in Example 1. I got something.

Example 3 Polystyrene resin (weight average molecular weight 10,000) 11
0 parts, 10 parts of montan wax [Hoechst E wax: manufactured by Hoechst Japan Co., Ltd.] and 80 parts of copper phthalocyanine blue [Chromofine Blue SR5020: manufactured by Dainichi Seika Kogyo Co., Ltd.] are mixed with a Henschel mixer. Next, this mixture is uniformly kneaded with three rolls at 120 ° C. After cooling and solidifying the obtained mixture, it was pulverized by a pulverizer and passed through a sieve having a nominal size of 500 μm (30 mesh) to obtain a powdery colorant composition of the present invention.

Example 4 Polystyrene resin (weight average molecular weight: 71,000) 90
Part, Epoxidized soybean oil [ADEKA SIZER O-130P:
Adeka Argus Chemical Co., Ltd.], 20 parts, montan wax [Hoechst E wax: Hoechst Japan Ltd.]
10 parts and 80 parts of copper phthalocyanine blue [Chromofine Blue SR5020: manufactured by Dainichi Seika Kogyo Co., Ltd.] are mixed with a Henschel mixer. The mixture is then added to 15
Mix uniformly with three rolls at 0 ° C. After cooling the obtained mixture, the mixture was pulverized by a pulverizer to obtain a nominal size of 500 μm (3 μm).
0 mesh) to obtain a powdery colorant composition of the present invention.

Example 5 A powdery material was prepared in the same manner as in Example 3 except that a styrene-methacrylic acid ester copolymer resin having a weight average molecular weight of 15,000 was used instead of the polystyrene resin used in Example 3. Of the present invention was obtained.

Example 6 The procedure of Example 3 was repeated except that a styrene-methacrylic acid ester copolymer resin having a weight average molecular weight of 40,000 was used instead of the polystyrene resin used in Example 3. Of the present invention was obtained.

Comparative Example 1 A powdery colorant composition of a comparative example was prepared in the same manner as in Example 1 except that a polystyrene resin having a weight average molecular weight of 100,000 was used instead of the polystyrene resin used in Example 1. I got something.

Comparative Example 2 Polystyrene resin (weight average molecular weight 100,000) 8
0 parts, epoxidized soybean oil [ADEKA SIZER O-130
P: Adeka Argus Chemical Co., Ltd.] 30 parts, montan wax [Hoechst E wax: Hoechst Japan Ltd.]
10 parts) and 80 parts of copper phthalocyanine blue [Chromofine Blue SR5020: manufactured by Dainichi Seika Kogyo Co., Ltd.] using a Henschel mixer. Next, the mixture is uniformly kneaded with three rolls at 150 ° C. After cooling the obtained mixture, the mixture is pulverized by a pulverizer to a nominal size of 500 μm.
(300 mesh) to obtain a powdery colorant composition of Comparative Example.

Evaluation Examples 1 to 6 and Comparative Examples 1 and 2 obtained as described above
For each of the colorant compositions of No. 2, the vinylidene chloride-based resin was colored as described below, and the dispersion state of the particles of the colorant composition was confirmed. 100 parts of vinylidene chloride resin, 5 parts of epoxidized soybean oil [Adekaizer O-130P: manufactured by Adeka Argus Chemical Co., Ltd.] and Examples 1 to 6 and Comparative Examples 1 to
0.5 part of each colorant composition of No. 2 was mixed with a Henschel mixer at 1500 rpm for 10 minutes and then taken out. Thereafter, each resin colored by each colorant composition was extruded at 170 ° C. using a 252 type uniaxial extrusion attachment of Rheocode System 90 (manufactured by HAAKE), and pressed to 0.1 mm with a PET film. Then, the dispersion state of the particles of the colorant composition was observed with a 50-fold optical microscope. The evaluation of the dispersion state was as follows: 1.4 mm × 1.8 m for each sample.
The measurement was performed on the following criteria in five visual fields of m. The results are shown in Table 1 below.

◎: Particles of the colorant composition of 20 μm or more were not observed in all of the five visual fields. ○: Particles of the colorant composition of 30 μm or more were observed in all of the five visual fields. Not possible △: Particles of the colorant composition of 40 μm or more are not observed in all of the five visual fields ×: Particles of the colorant composition of 40 μm or more are present in any of the five visual fields What is accepted

[0026]

[Table 1]

[0027]

As described above, according to the present invention, it is possible to uniformly disperse the pigment in the vinylidene chloride-based resin without contaminating the interior of the mixer used for coloring the vinylidene chloride-based resin. A colorant composition for vinylidene-based resin can be provided.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) C08J 3/22 C08L 27/08

Claims (4)

(57) [Claims] (1) a weight average molecular weight of 10,000 to 90,
A colorant composition for a vinylidene chloride-based resin, which is obtained by mixing a pigment with a polystyrene resin having a molecular weight in the range of 000. 2. The colorant composition for a vinylidene chloride-based resin according to claim 1, further comprising a plasticizer. 3. The colorant composition for vinylidene chloride-based resin according to claim 2, wherein the content of the plasticizer is 1 to 55 parts by weight based on 100 parts by weight of the polystyrene-based resin. 4. The polystyrene resin is selected from the group consisting of a polystyrene resin, a styrene-acrylate copolymer resin, a styrene-methacrylate copolymer resin and a styrene-acrylate-methacrylate copolymer resin. The colorant composition for a vinylidene chloride-based resin according to any one of claims 1 to 3, wherein the colorant composition is one or more selected resins.