An encapsulated flame retardant is made by a process including applying an organic silicon composition to a powder flame retardant. The organic silicon composition is an organofunctional-silane or a mixture of organofunctional silanes, an oligomeric organosiloxane or a mixture of oligomeric organosiloxanes, or a solvent-containing preparation based on monomeric organosilanes and/or on oligomeric organosiloxanes, or a preparation based on water-soluble organopolysiloxanes, or mixtures of any or all of these. These surface-modified flame retardants are used in particular in polymers and polymer compounds, for rendering naturally occurring materials flame retardant, and also for the intumescent coating of combustible materials.
A fire retardant material comprising both ammonium polyphosphate particles microencapsulated within a melamine or melamine-based resin and melamine-based particles retained in a base material. The material may be applied to a textile article or incorporated into an article during formation thereof.
The present invention provides a process for preparing a mixture, which mixture includes catenate and cyclic siloxanes of formula I and cyclic siloxanes of formula II ##STR1## wherein m is an integer from 0 to 40 and n is an integer from 2 to 40, wherein R.sub.2 and R.sub.3 are each independently an organic functional group selected from the group including alkyl, aryl, vinyl, and alkoxy groups, and wherein there is not more than one vinyl group or aryl group per silicon atom, said process including a controlled hydrolysis, condensation or cocondensation reaction of at least one monomeric silane in alcoholic solution in the presence of an acidic catalyst, which reaction includes contacting alcohol, water, and at least one chlorosilane component selected from the group including (i), (ii), (iii): (i) at least one arylchlorosilane; (ii) at least one admixture selected from the group including alkylchlorosilane and arylchlorosilane, arylchlorosilane and vinylchlorosilane, alkylchlorosilane and vinylchlorosilane, and arylchlorosilane and vinylchlorosilane and alkylchlorosilane; (iii) at least one selected from the group including chlorosilane, alkylchlorosilane, arylchlorosilane, and vinylchlorosilane in two or more separate batches to obtain two or more separate mixtures and thereafter combining the mixtures; to form the mixture of the catenate and cyclic siloxanes. The present invention also provides the mixtures and the use of such mixtures.
A composition containing an alkoxysiloxane including a catenate alkoxysilane of formula I and/or a cyclic siloxane of formula II, and a crosslinkable polymer compound and the use thereof as a water scavenger, dryer or precuring retarder R.sub.3Si--O--[SiR.sub.2--O--].sub.mSiR.sub.3 (I) ##STR00001##
