Process for the production of autocrosslinkable polymers containing n-alkoxymethyl groups
AssigneeBayer Aktiengesellschaft
InventorsDieter Arlt, Josef Bremen
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Abstract
Storable, autocrosslinkable polymers containing N-alkoxymethyl groups are obtained by reacting 5-alkoxymethyl-1,3,4-dioxazol-2-ones with a polymer having an average molecular weight above 600 and an average of more than one Zerewitinoff-active hydrogen atom in the molecule in the presence of a catalytic quantity of at least an alkali metal salt. The new catalysts allow to carry out the reaction at a temperature in the range from 50.degree. to 110.degree. C and guarantee a complete reaction of the reactants into uncrosslinked but autocrosslinkable light-stable end products.
Claims5
In the process of producing a storable, autocrosslinkable product containing N-alkoxymethyl groups which is soluble in organic solvents by reacting 5-alkoxymethyl-1,3,4-dioxazol-2-one with a polymerization, polycondensation or polyaddition product having an average molecular weight above 600 and having an average of more than one Zerewitinoff-active hydrogen atom in the molecule at a temperature of from 50.degree.-110.degree. C with substantially complete elimination of carbon dioxide from the 5-alkoxymethyl-1,3,4-dioxazol-2-one, the improvement wherein the process is carried out in the presence of a catalytic amount of at least one alkali metal salt of a carboxylic acid.
In the process of producing a storable, autocrosslinkable product containing N-alkoxymethyl groups which is soluble in organic solvents by reacting 5-alkoxymethyl-1,3,4-dioxazol-2-one with a polyester having an average molecular weight above 600 and having an average of more than one Zerewitinoff-active hydrogen atom in the molecule at a temperature of from 50-110.degree. C with substantially complete elimination of carbon dioxide from the 5-alkoxymethyl-1,3,4-dioxazol-2-one, the improvement wherein the process is carried out in the presence of a catalytic amount of at least one alkali metal salt of a carboxylic acid.
Dependencies are inferred from the claim text.