Water-dilutable etherified melamine-formaldehyde resins
First Claim
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1. Water-dilutable etherified melamine-formaldehyde resins obtained by reacting melamine, formaldehyde, a compound having anionic groups and an etherification alcohol in a ratio of amounts of substance of melamine:
- formaldehyde;
compound having anionic group;
etherification alcohol of 1;
(1.7 to 7.0);
(0.01 to 0.4);
(10 to
30) in the reaction mixture.
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Accused Products
Abstract
Water-dilutable etherified melamine-formaldehyde resins obtained by reacting melamine, formaldehyde, a compound having anionic groups and an etherification alcohol in a mixing ratio of melamine:formaldehyde:compound having anionic group:etherification alcohol of 1:(1.7 to 7.0):(0.01 to 0.4):(10 to 30) in the reaction mixture, are prepared in a multistage process and are used for preparing impregnates, especially glass fiber fleece and in paper coating.
6 Citations
13 Claims
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1. Water-dilutable etherified melamine-formaldehyde resins obtained by reacting melamine, formaldehyde, a compound having anionic groups and an etherification alcohol in a ratio of amounts of substance of melamine:
- formaldehyde;
compound having anionic group;
etherification alcohol of 1;
(1.7 to 7.0);
(0.01 to 0.4);
(10 to
30) in the reaction mixture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 11, 12, 13)
- formaldehyde;
- 8. A process for preparing water-dilutable etherified melamine-formaldehyde resins, wherein in the first stage, melamine and formaldehyde are reacted under alkaline conditions in the presence of a compound having an anionic group, and in the second stage, the etherification alcohol and an acid are added to the resultant resin solution and the etherification is effected.
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9. A process for preparing water-dilutable etherified melamine-formaldehyde resins, wherein in the first stage, melamine and formaldehyde are reacted under alkaline conditions until the melamine dissolves, and then a compound having an anionic group is added which in the second stage is reacted with the reaction product of the first stage, and in the third stage, the etherification alcohol and an acid are added to the resultant resin solution and the etherification is effected.
Specification