Additive with applications in construction chemistry

An additive comprising at least one core component A) selected from an inorganic core component and an organic component wherein the organic core component comprises a non-cellulosic water-soluble, water-swellable or water-absorbable compound selected from the group consisting of an oligosaccharide, a polysaccharide, a sulfo group-containing copolymer and a copolymer based on acrylamide, and wherein the inorganic core component is derived from borax, ammonium sulphate or zeolite, with a rheology-enhancing property and a shell component B) applied to the same by virtue of a chemical interaction which acts as a coating, wherein the shell component B) forms chemical cross-links with the core component A) and wherein the shell component B) consists of a film-forming polymer selected from the group consisting of polyvinyl alcohol, polyvinyl acetate, polyvinyl pyrrolidine, polyvinylidene chloride, an alginate, a cellulose derivative, a starch derivative, gelatin, a wax, and mixtures thereof, or a dialdehyde, and at least one additional process additive selected from a plasticizer, an anticaking agent, or an antifoaming agent, and the shell component B) is applied onto the core component A) with the aid of component C), wherein component C) is a dialdehyde in liquid form and has resulted in a chemical crosslinking of the shell component B).