Adhesive composition comprising polyisocyanate (diphenylmethane diisocyanate) and a wax emulsion (paraffin wax) with emulsifier (ethylene oxide polyaddition)

摘要

An adhesive composition for producing forms wherein lignocellulose-type material is used, hot pressed forms using the adhesive composition thereof having superior physical properties; such as resistance to hot water, and a process for producing hot pressed forms. The composition comprises (a) an organopolyisocyanate which is a polyisocyanate composed of 20% to 70% by weight of a diphenylmethane diisocyanate having two benzene rings in one molecule and from 80% to 30% by weight of a diphenylmethane diisocyanate polynuclear condensate having at least three benzene rings in one molecule, and has a viscosity of 500 mPa or less when in a solid state content of 100% by weight at 25oC; and (b) a wax emulsion prepared by emulsifying a wax (B1) which is paraffin wax containing at least 80% by weight of a paraffin having 20 to 40 carbon atoms, and has a melting point of from 40oC to 100oC, with an emulsifier (B2) which is an ethylene oxide polyaddition product of an aliphatic monoalcohol whose aliphatic chain has 14 to 20 carbon atoms, and a process for producing the hot-pressed forms using this adhesive composition.