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AssigneeAllnex Netherlands B.V.
InventorsMartin BOSMA, Petrus Johannes Maria David ELFRINK, Enrico Richardus August RENSEN, Richard Hendrikus Gerrit BRINKHUIS
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The invention relates to a process for the preparation of a thixotropic composition comprising polyurea particles, said process comprising contacting and reacting in a liquid medium reactants to form a polyurea and precipitating the polyurea to form polyurea particles, wherein acoustic vibration is applied during contacting of the reactants or as a post-treatment on the formed polyurea particles or both. The invention further relates to a thixotropic composition obtainable by the process, in particular thixotropic composition comprising high amounts of polyurea particles and optionally a polymer resin having high thixotropic efficiency. The compositions can be used, in particular as a masterbatch, in preparation of i.a. coating compositions.
A process for the preparation of a thixotropic composition comprising polyurea particles, said process comprising contacting and reacting in a liquid medium reactants (I) comprising a polyisocyanate (a) and a mono-amine (b) or reactants (II) comprising a polyamine (a) and a mono-isocyanate (b) to form a polyurea and precipitating the polyurea to form polyurea particles, wherein acoustic vibration is applied during contacting of the reactants or as a post-treatment on the formed polyurea particles or both.
The process for the preparation of a thixotropic composition wherein acoustic vibration is applied only as a posttreatment to a thixotropic composition or to a coating composition comprising polyurea particles.
Dependencies are inferred from the claim text.