| 摘要 |
The novel thixotroping agent according to the invention is obtained by reacting a component that contains isocyanate groups with a primary or secondary amine or a mixture of such amines and/or water. The component that contains isocyanate groups comprises Ia) at least one isocyanate with at least one diisocyanate structural unit which has i) an unsaturated or aromatic or non-aromatic ring structure with 5 - 10 ring atoms and ii) two isocyanate groups that are bound to the ring structure; if iii) the ring structure is non-aromatic, a) both isocyanate groups are linked with the ring structure via linear C1-C9 alkyl and/or linear C2-C10 etheralkyl, or b) one isocyanate group is directly linked with the ring structure and the other one is linked with it via linear C2-C9 alkyl and/or linear C2-C10 etheralkyl, and iv) if the ring structure is an unsaturated aromatic ring structure, at least one of the two isocyanate groups is linked with the ring structure via linear C2-C9 alkyl and/or linear C2-C10 etheralkyl, which both do not have any benzylene hydrogen atoms; and/or the component that contains isocyanate groups contains or consists of Ib) at least one oligomer of said isocyanate Ia) with 2 to 10 isocyanate units, especially a trimer; Ic) at least one partially blocked isocyanate Ia) and/or at least one partially blocked oligomer Ib).
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