Abstract
First in chapter 1 the article on the urea- formaldehyde condensates by H. Scheibler, F.Trostler and E.Scholz (1928), next in chapter 2 the article by Bois de Chesne (1932) and then in chapter 3 the article by H. Fahrenhorst (1955) are introduced. These authors reacted urea with formaldehyde in different solvents i.e. acetic acid, water and butanol and reached different conclusions. In chapter 4 the reactions of dimethylol-urea with phenols were investigated, introducing the articles by R. W. Martin (1952), H. de Diesbach (1931), H. v. Euler (1941) and G. Zigeuner (1955). In conclusion the behavior of NH-CH2 bond is analogous to the active center (H2C-NH-CH2) of the ammonia-resols, which is postulated by T. Shono (1929) and E. Imoto (1949).
