Granulated colorant and related art

Abstract

A granulated colorant as a granulation product of a powdery nigrosine dye, that has a bulk density of 0.4 to 0.7 g/ml and a hardness of 1 to 20 N. A high-concentration master batch obtained by blending a granulated colorant and a thermoplastic resin, which comprises 25 to 100 parts by weight of a nigrosine dye in the granulated colorant per 100 parts by weight of the thermoplastic resin. A colored composition comprising a granulated colorant or high-concentration master batch and a thermoplastic resin or thermoplastic elastomer.

1 . Granulated colorant that is a granulation product of a powdery nigrosine dye, wherein said granulation product has a bulk density of 0.4 to 0.7 g/ml and a hardness of 1 to 20 N. 
   
   
       2 . Granulated colorant of  claim 1 , wherein said powdery nigrosine dye has an average particle diameter of 5 to 20 μm. 
   
   
       3 . Granulated colorant of  claim 1 , wherein said powdery nigrosine dye has a specific surface area of 1.5 to 5.5 m 2 /g. 
   
   
       4 . Granulated colorant of  claim 1 , wherein said nigrosine dye has an Fe content of not more than 1% by weight. 
   
   
       5 . Granulated colorant of  claim 1 , wherein said granulation product is a cylindrical pellet 2 to 4 mm in diameter. 
   
   
       6 . Granulated colorant  claim 1 , which is a dried product of a granulated blend of 100 parts by weight of said nigrosine dye and 20 to 55 parts by weight of water. 
   
   
       7 . Granulated colorant of  claim 5 , which is a dried product of a granulated blend of 100 parts by weight of said nigrosine dye and 20 to 55 parts by weight of water. 
   
   
       8 . Method of producing a granulated colorant, which comprises a blending step for blending a powdery nigrosine dye and water, a granulation step for obtaining a cylindrical granulation product from the blend obtained in said blending step using an extrusion granulating machine, and a drying step for drying the granulation product obtained in said granulation step, wherein the granulation product after drying by said drying step has a bulk density of 0.4 to 0.7 g/ml and a hardness of 1 to 20 N. 
   
   
       9 . Method of producing a granulated colorant of  claim 8 , wherein said blending step is a step for blending 100 parts by weight of said nigrosine dye and 20 to 55 parts by weight of water using a rotary mechanical mixer. 
   
   
       10 . Method of producing a granulated colorant of  claim 8 , wherein said granulation step is a step for obtaining a cylindrical granulation product having a hardness after drying of 1 to 20 N by granulating the blend obtained in said blending step, while adjusting the pressure and/or revolution speed of the extrusion granulating machine. 
   
   
       11 . High-concentration master batch obtained by blending at least the granulated colorant of  claim 1  and a thermoplastic resin, wherein 25 to 100 parts by weight of the nigrosine dye in said granulated colorant is contained per 100 parts by weight of said thermoplastic resin. 
   
   
       12 . High-concentration master batch obtained by blending at least the granulated colorant of  claim 5  and a thermoplastic resin, wherein 25 to 100 parts by weight of the nigrosine dye in said granulated colorant is contained per 100 parts by weight of said thermoplastic resin. 
   
   
       13 . High-concentration master batch obtained by blending at least the granulated colorant of  claim 6  and a thermoplastic resin, wherein 25 to 100 parts by weight of the nigrosine dye in said granulated colorant is contained per 100 parts by weight of said thermoplastic resin. 
   
   
       14 . Method of producing a high-concentration master batch, which comprises a blending step for blending a powdery nigrosine dye and water, a granulation step for obtaining a cylindrical granulation product from the blend obtained in said blending step using an extrusion granulating machine, a drying step for drying the granulation product obtained in said granulation step, and a blend-molding step for blending at least the granulated colorant obtained via said drying step and a thermoplastic resin, and molding the blend into a master batch comprising 25 to 100 parts by weight of the nigrosine dye in said granulated colorant per 100 parts by weight of said thermoplastic resin using an extruding machine, wherein the granulation product after drying by said drying step has a bulk density of 0.4 to 0.7 g/ml and a hardness of 1 to 20 N. 
   
   
       15 . Colored composition obtained by blending at least the granulated colorant of  claim 1  and a thermoplastic resin or thermoplastic elastomer, wherein 0.01 to 10 parts by weight of the nigrosine dye in said granulated colorant is contained per 100 parts by weight of said thermoplastic resin or thermoplastic elastomer. 
   
   
       16 . Colored composition obtained by blending at least the granulated colorant of  claim 5  and a thermoplastic resin or thermoplastic elastomer, wherein 0.01 to 10 parts by weight of the nigrosine dye in said granulated colorant is contained per 100 parts by weight of said thermoplastic resin or thermoplastic elastomer. 
   
   
       17 . Colored composition obtained by blending at least the granulated colorant of  claim 6  and a thermoplastic resin or thermoplastic elastomer, wherein 0.01 to 10 parts by weight of the nigrosine dye in said granulated colorant is contained per 100 parts by weight of said thermoplastic resin or thermoplastic elastomer. 
   
   
       18 . Colored composition of  claim 15 , wherein said thermoplastic resin is one or two or more synthetic resins selected from the group consisting of polyamide resin, polyethylene terephthalate resin, polybutylene terephthalate resin, and polyphenylene sulfide resin. 
   
   
       19 . Colored composition of  claim 16 , wherein said thermoplastic resin is one or two or more synthetic resins selected from the group consisting of polyamide resin, polyethylene terephthalate resin, polybutylene terephthalate resin, and polyphenylene sulfide resin. 
   
   
       20 . Colored composition obtained by blending at least the high-concentration master batch of  claim 11  and a thermoplastic resin or thermoplastic elastomer, wherein 0.01 to 10 parts by weight of the nigro sine dye in said high-concentration master batch is contained per 100 parts by weight of said thermoplastic resin or thermoplastic elastomer. 
   
   
       21 . Colored composition obtained by blending at least the high-concentration master batch of  claim 12  and a thermoplastic resin or thermoplastic elastomer, wherein 0.01 to 10 parts by weight of the nigrosine dye in said high-concentration master batch is contained per 100 parts by weight of said thermoplastic resin or thermoplastic elastomer. 
   
   
       22 . Colored composition obtained by blending at least the high-concentration master batch of  claim 13  and a thermoplastic resin or thermoplastic elastomer, wherein 0.01 to 10 parts by weight of the nigro sine dye in said high-concentration master batch is contained per 100 parts by weight of said thermoplastic resin or thermoplastic elastomer. 
   
   
       23 . Colored composition of  claim 20 , wherein said thermoplastic resin is one or two or more synthetic resins selected from the group consisting of polyamide resin, polyethylene terephthalate resin, polybutylene terephthalate resin, and polyphenylene sulfide resin.