Cassella Aktiengesellschaft

Hoechst Aktiengesellschaft

Manfred Schon

Hans Honel

Walter Michel

Hans-Jerg Kleiner

Gerd Walz

Gerhard Brindopke

Karl Waldmann

Karlfried Keller

Jurgen Ott

Steffen Piesch

Karl Hintermeier

Peter Dorries

Wilhelm Adam

Alfons Wolf

Elif Tas

Wolfgang Kaiser

Gunther Wulff

Thomas Gotze

Frank Scholl

Uwe Kubillus

The present invention relates to melamine-formaldehyde resins comprising a guanamine, to processes for their preparation and to their use for the production of melamine resin films and edgings.

Impregnating resins for films and edgings

The present invention relates to a triazine/formaldehyde resin which contains a compound of the general formula I ##STR1## wherein R.sup.1 and R.sup.2 are defined as stated in claim 1, a process for its preparation and its use as a curing agent in surface coating systems.

Triazine/formaldehyde resin

A 3-component lacquer composed of A) compounds containing at least two R.sup.1 R.sup.2 C.dbd.CR.sup.3 --X groups (I) wherein R.sup.1 denotes hydrogen or a hydrocarbon radical having 1 to 10 carbon atoms, R.sup.2 and R.sup.3 are individually hydrogen, a hydrocarbon radical having 1 to 10 carbon atoms, an ester group containing the radical R.sup.4 of a monohydric alcohol having up to 12 carbon atoms, --CN, --NO.sub.2 or a --CO--NHR.sup.1 or --CO--R.sup.1 group, X is --CO-- which is attached to a further R.sup.1 R.sup.2 C.dbd.CR.sup.3 -- group either directly or via the radical of a polyhydric alcohol or of an amine and B) compounds containing:

Reaction product of olefinically unsaturated compounds with compounds

A reaction product of (A) compounds containing at least two R.sup.1 R.sup.2; C.dbd.CR.sup.3 --X groups (I) with (B) compounds which contain

Modified aminoplast, its preparation and its use

An improved process for the preparation of methylolaminotriazines etherified with alkanols and having per mol of the aminotriazine, an analytically determined average of 0.6 n to 2 n preferably 0.7 to 2 n methylol groups, which are etherified to the extent of 30 to 60%, n being the number of amino groups in the aminotriazine, wherein an aminotriazine is warmed to 80.degree. to 130.degree. C. with 0.7 n to 3 n mols of formaldehyde, 2 n to 10 n mols alkanol or a mixture of alkanols having 1 to 8 carbon atoms, the carbon chain of which, if having more than 2 carbon atoms, can also be interrupted by an oxygen atom, and 0 to 5 n mols of water, per mol of the aminotriazine, for 0.2 to 20 minutes, under elevated pressure, wherein the improvement comprises said aminotriazine being first heated to a temperature of 60.degree.-90.degree. C. in the presence of the formaldehyde and 0 to 30% by weight of the total amount of alkanol or alkanol mixture for 1 to 30 minutes at a pH 8 to 11 whereupon the remainder of the alkanol or alkanol mixture is added and the mixture is subsequently heated to 80.degree. to 130.degree. C. under elevated pressure in the presence of a strong inorganic or organic acid, at a pH of 3 to 8, for 0.2 to 20 minutes.

Process for the preparation of etherified methylolaminotriazines

This invention relates to a process for the manufacture of methanol-etherified methylolmelamines which are largely monomeric containing more than 5 mols of formaldehyde and more than 4 mols of methyl-etherified methylol groups, per mol of melamine, and having a viscosity of less than 20 pascal-seconds at 25.degree. C. and a solids content of at least 95%, comprising (a) methylolating melamine with formaldehyde at a molar melamine:formaldehyde ratio of 1:6.5 to 1:8 for 11/2 to 5 hours at 50.degree. C. to 85.degree. C., with the formaldehyde source being an aqueous solution of formalin containing 30 to 50% by weight of formaldehyde and having a pH of 6.7 to 7.3, and (b) etherifying the resulting suspension of methylolmelamine with 15 to 30 mols of methanol per mol of melamine at temperatures of 30.degree. C. to 60.degree. C. in the presence of a strong acid.

Preparation of methoxy-methyl melamines

A process for the preparation of a substantially monomeric methylolmelamine etherified by methanol which contains per mol of melamine, more than 5 mols of formaldehyde and more than 4 mols of methyl-etherified methylol groups which has a viscosity of less than 10 Pa.s at 25.degree. C. at a solids content of at least 95%, said process comprising reacting melamine and formaldehyde in a molar ratio of from 1 : 6.2 to 1 : 8, at a temperature of from 40 to 60.degree. C., in the presence of a basic catalyst in a reaction mixture which contains from 10 to 40% by weight of water and from 40 to 20% by weight of methanol thereby producing a suspension of methylolmelamine, and then etherifying the methylol melamine in the presence of from 15 to 30 mols of methanol per mol of melamine, at a temperature of from 25 to 50.degree. C., in the presence of a strong acid.

Preparation of melamine derivatives

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Rodgau, Germany

Manfred Schon