| 摘要 |
The present invention consists of a process of preparation of at least one mineral matter and/or of at least one pigment, including a calcium carbonate made at once partially organophilic and partially hydrophilic, in which the carbonate is blended and/or ground and/or concentrated in an aqueous medium, in the presence of at least one salt of ethylene acrylic acid, one dispersing agent and/or one grinding aid agent, which is introduced before and/or during this treatment stage.;Another object of the invention lies in the aqueous dispersions and suspensions of calcium carbonate thus obtained. They may be dried and the dry pigments obtained also constitute an object of the invention.;Use of these aqueous dispersions and these dry pigments in the field of plastic, paints and paper constitutes another object of the invention. |
| 主权项 |
1. A process for the preparation of at least one mineral matter and/or at least one pigment comprising calcium carbonate that is partially organophilic and partially hydrophilic, the process comprising the stages of:
a) supplying at least one mineral matter and/or one pigment comprising calcium carbonate in a dry form or in a form of an aqueous dispersion and/or suspension, b) blending and/or concentrating in an aqueous medium the mineral matter and/or pigment obtained from stage a) in the presence of: (1) a dispersing agent, and (2) at least one salt of ethylene acrylic acid, wherein
(i) the ethylene acrylic acid is a copolymer of acrylic acid monomer and ethylene monomer,(ii) carboxylic groupings of the ethylene acrylic acid salt are entirely neutralized or neutralized at a rate of 70 to 99% relative to the total number of the carboxylic sites of the ethylene acrylic acid, with at least one neutralization agent,(iii) the ethylene acrylic acid salt has a melt index of between 50 g/10 minutes and 1,500 g/10 minutes when the ethylene acrylic acid salt is totally neutralized, measured according to norm ASTM1238 125° C./2.16 kg, and(iv) the ethylene acrylic acid has a viscosity of 3,000 to 25,000 mPa·s, 15,000 to 100,000 mPa·s, and 50,000 to 400,000 mPa·s at temperatures of 200° C., 170° C. and 140° C., respectively, and wherein the dispersing agent is a homopolymer of acrylic acid and/or a copolymer of acrylic acid with a water-soluble monomer selected from methacrylic acid, maleic acid, itaconic acid, crotonic acid, fumaric acid, isocrotonic acid, aconitic acid, mesaconic acid, sinapic acid, undecylenic acid, angelic acid, canellic acid and/or 2-acrylamido 2-methyl propane sulfonic acid in acid form or partially neutralized, or acrylamide, methylacrylamide, an ester of an acrylic or methacrylic acid, acrylate phosphate, ethylene methacrylate, propylene glycol, vinylpyrrolidone, vinylcaprolactame, vinyl acetate, sodium styrene sulfonate, allylamine, or derivative thereof, and c) optionally drying the mineral matter and/or pigment resulting from stage b). |
