Claims
- 1. A method of fertilizing soil which comprises distributing over said soil by spraying means a dispersion of a urea aldehyde polymer prepared by a process which comprises:
- (a) reacting urea with formaldehyde and a higher aldehyde having from 2 to 4 carbon atoms, wherein the mole ratio of formaldehyde to said higher aldehyde is at least 2:1, in aqueous medium in the presence of an acid catalyst to form a dispersion of urea aldehyde polymer in said aqueous medium; and
- (b) neutralizing said dispersion.
- 2. A method of fertilizing soil which comprises distributing over said soil by spraying means a dispersion of a urea aldehyde polymer prepared by a process which comprises:
- (a) reacting urea with formaldehyde and a higher aldehyde having from 2 to 4 carbon atoms, wherein the mole ratio of formaldehyde to said higher aldehyde is at least 2:1, in an aqueous medium in the presence of an acid catalyst to form a dispersion of urea aldehyde polymer in said aqueous medium;
- (b) neutralizing said aqueous dispersion; and
- (c) adding a thickener-suspending agent to said dispersion.
- 3. A method of fertilizing soil which comprises distributing over said soil by spraying means a dispersion of a urea aldehyde polymer prepared by a process which comprises:
- (a) reacting urea with formaldehyde and a higher aldehyde selected from the group consisting of acetaldehyde, propionaldehyde and mixtures thereof in an aqueous medium in the presence of an acid catalyst to form a dispersion of a urea aldehyde polymer in said aqueous medium containing 5% to 20% nitrogen by weight based on the weight of nitrogen in the urea, wherein the mole ratio of urea to said formaldehyde and higher aldehydes is from about 1:1 to 2.5:1 and the mole ratio of formaldehyde to said higher aldehydes is from about 3:1 to 49:1;
- (b) neutralizing said aqueous dispersion;
- (c) adding a thickener-suspending agent to said dispersion.
Parent Case Info
This is a division of application Ser. No. 143,367, filed Apr. 24, 1980, now U.S. Pat. No. 4,298,512.
US Referenced Citations (9)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1212254 |
Nov 1970 |
GBX |
Non-Patent Literature Citations (3)
Entry |
Yee and Love, Proc. Soil Sci. Soc. Am. 11 (1946), pp. 389-391. |
Clark et al., Ind. & Eng. Chemistry, 40 (1948), pp. 1178-1183. |
Official Methods of Analysis of the Association of Official Agricultural Chemists, 11th Ed., 1970, pp. 18, 19. |
Divisions (1)
|
Number |
Date |
Country |
Parent |
143367 |
Apr 1980 |
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