Bayer Aktiengesellschaft

Carl-Gerd Dieris

Josef Pedain

Lutz Schmalstieg

Frank Richter

Reinhard Halpaap

Manfred Bock

Martin Brahm

Wolfgang Kremer

Bernd Riberi

Harald Mertes

Jurgen Weisser

Wolfgang Krohn

Process for the production of polyisocyanates containing isocyanurate groups and their use

Novel microcapsules are characterized in that the walls thereof consist of reaction products of crosslinking agents with iminooxadiazinedione isocyanates or the walls thereof contain such reaction products. A process for the production of such microcapsules has also been found, as have carbonless copying papers containing such microcapsules.

Microcapsules using iminooxadiazinedione polyisocyanates

The present invention relates to a polyisocyanate mixture containing isocyanate trimers provided that i) 30 to 100 mole percent of the trimers are iminooxadiazine diones B and ##STR1## ii) 0 to 70 mole percent of the trimers are isocyanurates A iii) less than 10 mole percent of the polyisocyanate mixture is of the uretone imine structural type, and iv) the ratio of the sum of the mole percents of trimers A and B to the mole percent of uretdiones is greater than 4:1 wherein R.sup.1, R.sup.2 and R.sup.3 are the same or different and represent the groups obtained by removing an isocyanate group from an aliphatic, cycloaliphatic, aromatic and/or araliphatic isocyanate having an NCO content of less than 70% and/or their oligomers. The present invention also relates to a process for the preparation of these isocyanate trimers, mixtures of these isocyanate trimers with other polyisocyanates and compositions containing these isocyanate trimers, in which the isocyanate groups may optionally be blocked with blocking agents, and compounds containing two or more isocyanate-reactive groups.

Isocyanate trimers containing iminooxadiazine dione groups, their

A process for the production of polyisocyanates containing isocyanurate groups by the catalytic trimerization of a mixture of low molecular weight isocyanate components having aliphatically and aromatically bound isocyanate groups in the presence of aminosilyl compounds, the resulting polyisocyanates and their use in coating compositions.

Process for the production of polyisocyanates containing isocyanurate

A process for the preparation of isocyanurate group-containing polyisocyanates in solvents which are inert towards isocyanate groups by reacting 0.2 to 1.5% of the isocyanate groups of diisocyanatotoluene with an aliphatic monohydric alcohol having 6 to 22 carbon atoms and subsequently trimerizing at least a portion of the isocyanate groups of the urethanized diisocyanates in the form of 40 to 70 wt. % solutions in lacquer solvents which are inert towards isocyanate groups, and the use of these polyisocyanates in two-component polyurethane coating compositions.

Process for preparing isocyanurate group-containing polyisocyanates and

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Dormagen, Germany

Carl-Gerd Dieris