Patent ID: 8083851
Filing Date: 2011-12-27
Classification: A01N,C04B

Abstract:
1. An antimicrobial additive in the form of discrete particles of a wettable, caked inorganic material of from 20 to 5000 microns, said discrete particles consisting essentially of: a) gypsum, gypsum cement, calcium hydroxide, calcium carbonate, chalk clay, Portland cement, kalsomine, or calcite as the matrix phase material having incorporated or dispersed therein b) from about 1 to about 50 parts by weight, based on 100 parts by weight of (a), of at least one antimicrobial metal ion-containing inorganic or organometallic antimicrobial agent capable of releasing antimicrobial metal ions in the presence of water in an antimicrobially effective amount; and c) optionally, colorants, plasticizers, pigments, foaming suppressors, defoaming agents, antifoaming agents, surfactants, wetting agents, residual water, and combinations thereof; wherein the antimicrobial metal ion is at least one of silver, copper, zinc, tin, gold, mercury, lead, iron, cobalt, nickel, manganese, arsenic, antimony, bismuth, barium, cadmium, chromium and thallium and the antimicrobial agent is in the form of a salt, an organometallic compound, a water soluble glass containing a source of the antimicrobial metal ion(s), an ion-exchange antimicrobial agent comprising a ceramic carrier particle with ion-exchangeable antimicrobial metal ions, or combinations thereof; provided that when the antimicrobial agent is in the form of discrete particles dispersed in (a), the particle size of the antimicrobial agent is no more than one-tenth that of the particle size of the antimicrobial additive; wherein said antimicrobial additive particles are capable of maintaining, for the most part, their particle form while being incorporated into cements, mortars and cementitious or hybrid cementitious compositions.