Cassella Farbwerke Mainkur Aktiengesellschaft

Cassella Farbwerke Mainkur Atiengesellschaft

Walter Michel

Manfred Schon

Dieter Tichy

Karl Schnee

Gunter Gruber

Karlfried Keller

Hans Honel

Wolfgang Schmalz

Helmut Durr

Dieter Plath

Aminoplast preparation is greatly speeded by condensing an aminotriazine such as melamine with formaldehyde and etherifying alkanol under superatmospheric pressure and at a temperature between about 80.degree. and about 130.degree. C.

Preparation of aminoplasts

Low-viscosity high-solids-content melamine-formaldehyde condensates having high reactivity, low content of free formaldehyde and good compatibility, are prepared by effecting condensation in an alcohol having up to 3 carbons, then concentrating the condensate and heating the concentrate in a higher alcohol having from 3 to 18 carbons and again concentrating. The final product cures on heating to a hard glossy film and can be added to other uncured resins to improve the hardness of their films.

Melamine-formaldehyde condensates and mixtures thereof

Melamine resin films prepared by impregnating paper, cellulose fleece or fabric with a solution of a monomeric dimethylolmelamine mono-, di- or trimethylether, monomeric trimethylolmelamine mono-, di- or trimethylether or a mixture thereof and drying the same at temperatures of about 130.degree. to about 180.degree. C.

Melamine resin films prepared by impregnating of paper, cellulose,

High quality coatings and the like are formed from dispersions in a reactive liquid of finely divided solid isocyanated polyester resin having isocyanate groups part of which are masked but become unmasked upon heating and then react with the liquid. The liquid is essentially one or more highly etherified methylolated aminotriazine in which some of etherifying is with alkoxyethyl groups that provide relatively low viscosity and good reactivity.

Heat hardening mixtures

Melamine resin films prepared by impregnating paper, cellulose fleece or fabric with a solution of a monomeric dimethylolmelamine mon-, di- or trimethylether, monomeric trimethylolmelamine mono-, di or trimethylether or a mixture thereof and drying the same at temperatures of about 130.degree. to about 180.degree.C.

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Frankfurt-am-Main, Germany

Walter Michel