Oligosilazane condensation product, useful for coating or impregnating substrates, is prepared by reaction of an oligosilazane composition with a dialk(en)ylamino compound

摘要

An oligosilazane containing condensation product (I) is prepared by reaction of an oligosilazane composition (II) having an average mol. wt. of no more than 1000 g/mol with a dialk(en)ylamino compound (III) of formula (1). An oligosilazane containing condensation product (I) is prepared by reaction of an oligosilazane composition (II) having an average mol. wt. of no more than 1000 g/mol with a dialk(en)ylamino compound (III) of formula (1) such that an average of 1.6-2.2 moles HN(R<4>)2 is cleaved per mole of (B). Independent claims are included for: (i) a process for coating or impregnating a substrate with a solution of (I), evaporating the solvent and curing (I); and (ii) the coated substrate. A(N(R<4>)2)m (1) A = B, Al, Ti, Zr or Hf; R<4> = alkyl or alkenyl; m = valency of A.