Powdery fire-extinguishing agent, and process for its preparation

Claim 1

A powdery fire-extinguishing agent containing a first powder as main ingredient and a second powder as adjuvant, at least one of said first and second powders being prepared by dipping said powders in a solution or dispersion of an organofluorine compound to adsorb thereon said organofluorine compound and then drying the dipped powders, said organofluorine compound having a fluoroalkyl group containing 3 to 20 carbon atoms, having a major transition temperature of 20° C. or higher, having a fluorine content of 5% by weight or more, being insoluble in water and insoluble or sparingly soluble in a combustible liquid, having oil repellency, being selected from the group consisting of: (i) a homopolymer or copolymer of a vinyl monomer having a fluoroalkyl group containing 3 to 20 carbon atoms; (ii) a mono- or polyester formed between a monohydric or polyhydric alcohol containing 3 to 30 carbon atoms and having a fluoroalkyl group containing 3 to 20 carbon atoms and a mono- or polycarboxylic acid containing 4 to 20 carbon atoms and being optionally fluorinated; (iii) a mono- or polyester formed between a mono- or polycarboxylic acid containing 3 to 20 carbon atoms and having a fluoroalkyl group containing 3 to 20 carbon atoms and a monohydric or polyhydric alcohol containing 2 to 20 carbon atoms and being optionally fluorinated; (iv) a mono- or polyurethane formed between a monohydric or polyhydric alcohol containing 3 to 30 carbon atoms and having a fluoroalkyl group containing 3 to 20 carbon atoms and an organic mono- or polyisocyanate; and (v) a homopolymer or copolymer of an epoxide monomer having a fluoroalkyl group containing 3 to 20 carbon atoms, and being adhered in an amount, based on the treated powdery fire-extinguished agent, of 0.01 to 10% weight to the treated fire-extinguishing agent.