Bayer Aktiengesellschaft

Jurgen Weisser

Horst Berneth

Helmut Reiff

Frank Richter

Lothar Puppe

Harro Traubel

Peter-Roger Nyssen

Gunter Klug

Ulrich Nehen

Wolfgang Krohn

Carl-Gerd Dieris

Manfred Hagedorn

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

In the process for the preparation of microcapsule dispersions by an interface polyaddition process in which an oil-in-water emulsion is prepared from an oily phase, which comprises the substance to be encapsulated and a lipophilic substance capable of polyaddition, and on aqueous phase, and the reaction partner required for the polyaddition is then added to the aqueous phase, capsules with smaller particle sizes are obtained, with a saving in emulsifying energy, if an oil-soluble emulsifier is added to the oily phase before the emulsification.

Process for microencapsulation using oil-soluble emulsifiers

Novel microcapsules are characterized in that their walls are made of reaction products of guanidine compounds and polyisocyanates or contain such reaction products. Dispersions containing such microcapsules can be prepared by replacing the amines, amino alcohols or hydrazine compounds in processes known per se for preparing microcapsule dispersions from polyisocyanates and amines, amino alcohols or hydrazine compounds by guanidine compounds. The present invention also relates to no-carbon copy papers containing dyestuff precursors in microcapsules whose walls are made of reaction products of guanidine compounds and polyisocyanates or contain such reaction products.

Microcapsules having walls made of polyisocyanate/guanidine reaction

Particularly advantageous and environmentally compatible recording material comprises, in microencapsulated form, at least one 3,1-benzoxazine color donor dissolved in a solvent, and is characterized in that the solvent consists of one or more natural oils and/or one or more esters of fatty acids on which natural oils are based, or comprises such oils and/or esters.

Pressure-sensitive recording material which comprises natural oils

Microcapsules can be prepared in an energy-saving manner by using a polyisocyanate which consists exclusively or partially of reaction products of isocyanates having a functionality of 2 or more with polyethylene oxide alcohols.

Microcapsules made of isocyanates with groups containing polyethylene

The present invention relates to a new zeolite material having a composition (molar ratios of the oxides) corresponding to the formula:

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Dormagen, Germany

Jurgen Weisser