Patent ID: 6451101
Filing Date: 2002-09-17
Classification: C08G,C08L

Abstract:
A process for producing a parting agent, comprising the steps of:a) providing an isocyanate compound and an isocyanate-reactive compound of the general structure R(ao)nY â€ƒin stoichiometrically equivalent amounts; wherein R is a hydrophobic group containing alkyl, alkaryl, polyaryl, or siloxane moieties and wherein the alkyl moieties comprise straight chain or branched hydrocarbons with 6 or more carbon atoms, the alkaryl moieties comprise monoalkyl, dialkyl, or trialkyl substituted aromatic hydrocarbons with 9 or more carbon atoms, the polyaryl moieties comprise a polyphenyl structure that is either alkyl substituted or unsubstituted, and the siloxane moieties comprise a trisiloxane or higher polysiloxane; (ao) is an alkylene oxide or mixture of alkylene oxides selected from the group consisting of ethylene oxide, propylene oxide, butylene oxide, and mixtures thereof; n is from about 1 to about 25; and Y represents a monofunctional isocyanate-reactive group b) reacting the isocyanate compound and the isocyanate reactive-compound at a first temperature until the isocyanate number is at an intermediate level; c) thereafter, adding a second charge of an isocyanate compound; and d) reacting the second charge of isocyanate compound and the isocyanate reactive-compound at a second temperature higher than the first temperature for a time sufficient to react substantially all of the isocyanate groups.