Abstract: A polyisocyanate composition comprising 0.1% by weight or more and less than 10% by weight of a silicate compound dissolved or dispersed into at least one kind of polyisocyanate compound selected from the group consisting of diphenylmethane diisocyanate oligomers containing 20 to 60% by weight of diphenylmethane diisocyanate and the derivatives thereof. This composition has an excellent low temperature storage stability.

Abstract: This invention relates to a polyisocyanate composition which contains a specific amount of denatured silicon oil being inactive to polyisocyanate compound comprising a specific diphenylmethane diisocyanate oligomer and/or its derivatives. The polyisocyanate composition of this invention has excellent storage stability at low temperature.

Abstract: The present invention relates to a reaction product of a tetraalkoxysilane or a silicate oligomer obtained by its partial hydrolysis-dehydration-polycondensation, with an amino alcohol having one or two hydroxyl groups, and a dehydrating agent comprising such a reaction product.The dehydrating agent of the present invention is suitable for dehydrating a moisture at a level of a few hundreds ppm. Further, since an amino alcohol is formed by the dehydration, it is particularly useful as a dehydrating agent for a raw material for the production of a urethane resin or an epoxy resin.

Abstract: The present invention relates to a novel modified silicate composition obtained by reacting an alkyl silicate or its oligomer with a certain specific active hydrogen-containing compound in a certain specific ratio.