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US 4,225,481 AGranted
Aminoplast dispersions and polyurethanes prepared therefrom
AssigneeBayer Aktiengesellschaft
InventorKuno Wagner
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AssigneeBayer Aktiengesellschaft
InventorKuno Wagner
Estimating the term…
A stable dispersion of an aminoplast which is obtained by a process which comprises condensing ammonia, hydrazine or a organic compound having a molecular weight of from about 50 to about 400 and which contains at least two groups selected from the group consisting of --NH.sub.2 and --NH-- with benzoquinone or a compound of the formula R--CO--R' in which R and R' stand for the same or different radicals selected from the group consisting of hydrogen C.sub.1 -C.sub.4 alkyl groups which may carry chlorine substituents, C.sub.2 -C.sub.4 -alkenyl groups, C.sub.6 -C.sub.10 aryl groups, C.sub.7 -C.sub.10 aralkyl groups, C.sub.5 -C.sub.10 cycloalkyl groups or semi-acetals obtained by reacting said carbonyl compounds with monohydric or dihydric aliphatic alcohols having one to ten carbon atoms in an organic polyhydroxyl compound having a molecular weight of from about 250 to about 14000 as the reaction medium.
In a process which comprises preparing aminoplast condensates by the oligocondensation or polycondensation of substances which are capable of aminoplast formation, the improvement wherein said oligocondensation or said polycondensation is conducted in an organic polyhydroxyl compound having a molecular weight of from about 250 to about 14,000, whereby a storage stable aminoplast dispersion having a solids content of from about 5 to about 45% by weight is produced.
A storage stable dispersion of an aminoplast in an organic polyhydroxyl compound having a molecular weight of from about 250 to about 14,000, said dispersion having a solids content of from about 5 to about 45% by weight.
A process for preparing a dispersion of an aminoplast condensate in an organic polyhydroxyl compound, which comprises condensing urea with formaldehyde in the presence of a primary hydroxyl containing poly(propylene/ethylene)oxide having a weight ratio of bound propylene oxide to bound propylene oxide of 83:17, said poly(propylene/ethylene)oxide having a hydroxyl number of about 35.
A process for preparing a dispersion of an aminoplast which comprises reacting a carbonyl compound with ammonia or a compound having --NH.sub.2 or --NH-- groups and adapted to react with a carbonyl compound to form an aminoplast in an organic polyhydroxyl compound which is adapted to react with an organic polyisocyanate to form a polyurethane.
Dependencies are inferred from the claim text.