# US 4,379,871 A · Process for the production of carbon black containing pigment-synthetic resin concentrates > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,379,871 A - Document ID: US4379871A - Status: Granted - Kind: A - Application number: 05/865,968 - Filed: 1977-12-30 - Granted: 1983-04-12 - Earliest claimed: 1975-01-09 - Assignees: Deutsche Gold- und Silber-Scheideanstalt vormals Roessler - Inventors: Peter Werle; Hans Graf; Erwin Walter - Web page: https://patentgrep.com/patent/US4379871A ## CPC - C08J 3/226: {using a polymer as a carrier} - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) ## Abstract There is disclosed a process for the production of a pigment-synthetic resin concentrate containing an organic solvent soluble polymer and carbon black having quicker distributability in organic media such as lacquer binding media, printing inks, etc., such concentrates being especially suitable for the production of molded parts, castings, films and/or synthetic fibers, the process comprising continuously homogenizing in a mixer powdery pigment and powdery synthetic resin jointly with an organic solvent in a given case also containing plasticizer, stabilizer and/or dispersing acid, dispersing the pigment in the mixture, removing the solvent from the dispersion, comminuting the resulting pigment-synthetic resin concentrated and grinding the product. ## Claims ### Claim 1 In a process for the production of a pigment-synthetic resin concentrate containing an organic solvent soluble polymer and carbon black having rapid distributability in organic solvent media, the improvement consisting essentially of continuously homogenizing in a mixer (1) a carbon black containing pigment powder and (2) an organic solvent soluble synthetic resin with (3) an organic solvent for said synthetic resin as the sole solvent and in an amount sufficient to dissolve the synthetic resin, dispersing the pigment in the mixture, removing the solvent from the dispersion by drying and comminuting the resulting pigment-synthetic resin concentrate. ### Claim 2 (depends on 1) The process of claim 1 wherein there is also included at least one member of the group consisting of plasticizers for the synthetic resin stabilizers for the synthetic resin and dispersing agents. ### Claim 3 (depends on 1) The process of claim 1 wherein there is included a dispersing agent. ### Claim 4 (depends on 1) The process of claim 1 wherein there is included a plasticizer for the synthetic resin. ### Claim 5 (depends on 1) The process of claim 1 wherein there is included a member of the group consisting of heat and light stabilizers for the synthetic resin. ### Claim 6 (depends on 1) The process of claim 1 comprising carrying out the dispersing in a plurality of grinding apparatus in succession. ### Claim 7 (depends on 1) The process of claim 1 wherein the solvent consists essentially of a member of the group consisting of acetone, dimethyl formamide, carbon tetrachloride, ethyl acetate, tetrahydrofuran, toluene, chloroform, ethyl alcohol and o-chlorophenol. ### Claim 8 (depends on 1) The process of claim 1 comprising removing the solvent from the dispersion by means of vacuum drum drying. ### Claim 9 (depends on 8) The process of claim 8 comprising carrying out the vacuum drum drying at a pressure up to 100 Torr. ### Claim 10 (depends on 9) The process of claim 9 wherein the pressure in the vacuum drum drying is up to 70 Torr. ### Claim 11 (depends on 9) The process of claim 9 wherein the solvent is removed from the dispersion at a temperature between 40.degree. and 170.degree. C. ### Claim 12 (depends on 11) The process of claim 11 wherein the solvent is removed from the dispersion at a temperature between 50.degree. and 160.degree. C. and the vacuum drum drying is at up to 70 Torr. ### Claim 13 (depends on 8) The process of claim 8 comprising removing the solvent from a dispersion having a solids content of 10 to 50 weight %. ### Claim 14 (depends on 13) The process of claim 13 wherein the solids content is 14 to 47 weight %. ### Claim 15 (depends on 1) The process of claim 1 comprising removing the solvent from the dispersion by atomizing drying with the aid of an atomizing gas. ### Claim 16 (depends on 15) The process of claim 15 wherein the atomizing gas is nitrogen. ### Claim 17 (depends on 15) The process of claim 15 wherein the atomizing gas has an entrance temperature of 100.degree. to 200.degree. C. and an exit temperature of 60.degree. to 100.degree. C. ### Claim 18 (depends on 15) The process of claim 15 wherein the pigment-synthetic resin concentrate which is atomized has a solids concentration of 10 to 40 weight %. ### Claim 19 (depends on 18) The process of claim 18 wherein the concentration of the atomized pigment-synthetic resin concentrate is 15-25 weight %. ### Claim 20 (depends on 1) The process of claim 1 wherein the carbon black is selected from the group consisting of High Color Channel blacks, Regular Color Channel blacks, Long-F low Impingement blacks, Medium Color Channel blacks, Fine Color-Furnace blacks, Fine Color Furnace modified blacks and Medium Color Furnace blacks. ### Claim 21 (depends on 1) The process of claim 1 wherein the synthetic resin comprises a member selected from the group consisting of polyvinyl chloride-polyvinyl acetate mixed polymer, polyacrylonitrile, polystyrene, nitrocellulose, polyvinyl chloride, polyethylene, polymethyl methacrylate, polyamides and polyesters. ### Claim 22 (depends on 1) The process of claim 1 wherein the ratio of synthetic resin to pigment is from 85:15 to 45:55. ### Claim 23 (depends on 22) The process of claim 22 wherein the ratio of synthetic resin to pigment is from 82:18 to 49:51. ### Claim 24 (depends on 22) The process of claim 22 wherein the synthetic resin is used in a concentration of from 6.0 to 40.0 weight % of the mixture to be dispersed. ### Claim 25 (depends on 24) The process of claim 24 wherein the dispersion the ratio of the sum of the synthetic resin and pigment to the solvent is from 1:1.0 to 1:7.0 by weight. ### Claim 26 (depends on 25) The process of claim 25 wherein said ratio is 1:1.0 to 1:6.0. ### Claim 27 (depends on 1) The process of claim 1 wherein a plasticizer for the synthetic resin is present in an amount as to 20 weight % based on total weight of synthetic resin and pigment is used. ### Claim 28 (depends on 27) The process of claim 27 wherein the plasticizer is 2-5 weight %. ### Claim 29 (depends on 1) The process of claim 1 wherein a stabilizer of the group consisting of heat and light stabilizers for the synthetic resin is present in a concentration up to 2 weight % based on the total weight of synthetic resin and pigment. ### Claim 30 (depends on 29) The process of claim 29 wherein the stabilizer is present in an amount up to 0.5 weight %. ### Claim 31 (depends on 1) The process of claim 1 wherein a dispersing agent is present in an amount up to 0.3 weight % based on the total weight of the synthetic resin and pigment. ### Claim 32 (depends on 31) The process of claim 31 wherein the dispersing agent is present in an amount up to 0.2 weight %. ### Claim 33 (depends on 1) The process of claim 1 wherein the improvement consists essentially of continuously homogenizing in a mixer materials consisting essentially of (1) a carbon black containing pigment powder and (2) an organic solvent soluble synthetic resin with (3) an organic solvent, dispersing the pigment in the mixture, removing the solvent from the dispersion by drying and comminuting the resulting pigment-synthetic resin concentrate. ### Claim 34 (depends on 1) The process of claim 1 wherein the drying is spray drying or vacuum drum drying. ### Claim 35 (depends on 34) The process of claim 34 wherein the drying is spray drying. ### Claim 36 (depends on 34) The process of claim 34 wherein the drying is vacuum drum drying. ### Claim 37 In a process for the production of a pigment-synthetic resin concentrate containing an organic solvent soluble polymer and carbon black having rapid distributability in organic solvent media, the improvement consisting essentially of continuously homogenizing in a mixer (1) a carbon black containing pigment powder and (2) an organic solvent soluble synthetic resin with (3) an organic solvent, said organic solvent consisting of a solvent for said synthetic resin and being present in an amount sufficient to dissolve the synthetic resin, dispersing the pigment in the mixture, removing the solvent from the dispersion by drying and comminuting the resulting pigment-synthetic resin concentrate. ### Claim 38 (depends on 37) The process of claim 37 wherein the solvent is removed by atomizing drying with the aid of an atomizing gas. ### Claim 39 (depends on 37) The process of claim 37 wherein the drying is spray drying. ### Claim 40 (depends on 37) The process of claim 37 wherein the drying is vacuum drum drying.