Coating agents calcium carbonate

G-White. [J.M. Huber] Calcium carbonate functional filler/extender for coatings, plastics, rubber, building prods., ceramics flux, paper fillers, adhesives, cleaning compds., and polishing agents. 

More recently, Kotek at al. studied the effects of untreated (denoted as Cl) and stearate-treated calcium carbonate particles (denoted as C2) of 1.3 p.m on the tensile properties of P-PP. Moreover, stearate-coated calcium carbonate particles of 0.075 p,m (denoted as C3) are also used (44). The p-nucleating agent employed is based on an amide of dicarboxylic acid. The critical concentration of p-nucleator needed to achieve 61% P-PP is 0.03 wt% on the basis of the XRD analysis. With further increase in the p-nucleator content to 0.1 wt% (supercritical), the p-PP content increases, but very slightly, to 65%. Furthermore, the K value also depends... 

Some grades of PCC are surface coated to improve handling characteristics and dispersability in, for example, plastics. Additives include fatty acids, resins and wetting agents. They help to reduce the surface energy of the calcium carbonate and improve dispersion in organic materials. 

Chem. Descrip. Calcium carbonate, coated with < 2% stearic acid Chem. Analysis CaCOj (97.6%), MgCOs (1.5%), moisture (0.2% max.) Uses Coated pigment, filler, reinforcement with easy dispersion in plastic compds., e.g., polyolefins, rigid and flexible PVC, nat. and syn. rubbers and latexes for wire and cable insulation compds., water sealant compds., improved impact props, in PP hardens and stiffens stocks filler, pigment, reinforcing agent in paper, paints, caulks Features Flydrophobic disperses readily Regulatory NSF compliance... 

Chem. Descrip. Precipitated calcium carbonate CAS 471-34-1 EINECS/ELINCS 207-439-9 Uses Reinforcing agent, filler for rubber (SBR, NR, NR, CR), PVC plasti-sols, paints/coatings, extruded and molded goods, adhesives, sealants, sundries... 

Uses Dispersant for calcium carbonate, pigments for paper coating and syn. pulp dispersant for paints, pigments, inks vise, reducer fluidizing agent for concrete and mortar Properties Liq. anionic 37% act. 

Stearic Acid. This is frequently used to coat filler particles. In calcium carbonate, it is the preferred coupling agent Presumably the -CO2H group orients toward the filler particle, and probably reacts with iL while the -Cj7ll35 chain penetrates into the polymer matrix. 

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