Bulk material comprising solid diisocyanates and prepolymers containing urethane groups obtainable therefrom
AssigneeCovestro Intellectual Property GmbH & Co. KG
InventorsMichael Merkel, Anna-Marie Zorn, Rainer Bellinghausen, Pascal Scherpian, Ralph Weber
Life of this patent
Estimating the term…
Abstract
The present invention relates to a bulk material comprising solid diisocyanate, especially naphthalene 1,5-diisocyanate or p-phenylene diisocyanate, to a process for production thereof, and to a process for preparing isocyanate prepolymers using the bulk material of the invention, to the isocyanate prepolymers themselves and to the use thereof for preparation of polyurethane elastomers, especially cast polyurethane elastomers.
Claims4
A process for producing a bulk material, comprising a crystallization operation (i) and at least one step (ii) comprising classification, agglomeration, or comminution,
- wherein the bulk material comprises a solid diisocyanate, wherein the solid diisocyanate is a solid at room temperature (25° C.), wherein the solid diisocyanate has a melting point of ≥80° C., and wherein, in a sieve analysis of the bulk material with a twin-sieve arrangement having mesh sizes 0.1 mm and 4 mm, at least 90% by weight of the bulk material is obtained in a fraction between 0.1 mm and 4 mm.
Dependencies are inferred from the claim text.