US4298512A
Expired / Lapsed
US
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Urea formaldehyde dispersions modified with higher aldehydes
Assignee: W A CLEARY CHEMICAL Corp
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Filing: 1980-04-24
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Granted: 1981-11-03
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Expires: 2000-04-24
Abstract
Abstract A process for the preparation of neutralized, urea aldehyde polymeric dispersions by acid catalyzed reaction of urea and formaldehyde plus a higher aldehyde, having from two to four carbon atoms, wherein the mol ratio of formaldehyde to the higher aldehyde is at least 2:1 and the function of the higher aldehyde is to act as an inhibitor of further polymerization. The dispersions are further stabilized against settling by the addition of thickener-suspending agents. The products of the process are useful as sources of nitrogen which continue to fertilize plants, especially grasses for long periods of time after applied by means of conventional spraying equipment.
Inventors
- 👤 Paul Sartoretto
- 👤 Kak-Yuen Tao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:57
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C05; C05C; C05C9/00; C05C9/02; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/10; C08G12/12; C08J2361/00; C08J2361/20; C08J2361/22; C08J2361/24
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
70 words
A process for preparing a dispersion of a urea aldehyde polymer 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.
Claim 2
Dependent Claim
70 words
A process for preparing a dispersion of a urea aldehyde polymer 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.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein said higher aldehyde is selected from the group consisting of acetaldehyde, propionaldehyde and mixtures thereof.
Claim 4
Dependent Claim
20 words
The process of claim 2 wherein the mole ratio of formaldehyde to higher aldehydes is from about 3:1 to 49:1.
Claim 5
Dependent Claim
22 words
The process of claim 1 wherein the mole ratio of urea to formaldehyde and higher aldehydes is from about 1:1 to 2.5:1.
Claim 6
Dependent Claim
27 words
The process of claim 1 wherein the nitrogen concentration in said dispersion is from about 5% to 20% based on the weight of nitrogen in the urea.
Claim 7
Dependent Claim
81 words
A process for preparing a stable dispersion of a urea aldehyde polymer 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.
Claim 8
Dependent Claim
81 words
A process for preparing a stable dispersion of a urea aldehyde polymer 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.
Claim 9
Dependent Claim
21 words
The process of claim 6 wherein said higher aldehyde is selected from the group consisting of acetaldehyde, propionaldehyde and mixtures thereof.
Claim 10
Dependent Claim
20 words
The process of claim 6 wherein the mole ratio of formaldehyde to higher aldehydes is from about 3:1 to 49:1.
Claim 11
Dependent Claim
22 words
The process of claim 6 wherein the mole ratio of urea to formaldehyde and higher aldehydes is from about 1:1 to 2.5:1.
Claim 12
Dependent Claim
28 words
The process of claim 6 wherein the nitrogen concentration in said dispersion is from about 5% to about 20% based on the weight of nitrogen in the urea.
Claim 13
Dependent Claim
15 words
The process of claim 6 which further comprises adding a non-ionic surfactant to said dispersion.
Claim 14
Dependent Claim
25 words
The process of claim 6 wherein said higher aldehyde is acetaldehyde and the mole ratio of formaldehyde to acetaldehyde is from about 3:1 to 19:1.
Claim 15
Dependent Claim
24 words
The process of claim 6 wherein said higher aldehyde is propionaldehyde and the mole ratio of formaldehyde to propionaldehyde is from 3:1 to 49:1.
Claim 16
Dependent Claim
22 words
The process of claim 6 wherein the amount of thickener-suspending agent is from about 0:01 to 1% by weight of said dispersion.
Claim 17
Dependent Claim
122 words
A process for preparing a stable dispersion of a urea aldehyde polymer 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; and (c) adding a thickener-suspending agent to said dispersion.
Claim 18
Dependent Claim
122 words
A process for preparing a stable dispersion of a urea aldehyde polymer 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; and (c) adding a thickener-suspending agent to said dispersion.
Claim 19
Dependent Claim
22 words
The process of claim 15 wherein the mole ratio of urea to formaldehyde and higher aldehyde is from about 1.3:1 to 2:1.
Claim 20
Dependent Claim
28 words
The process of claim 15 wherein the nitrogen concentration in said dispersion is from about 13% to about 19% based on the weight of nitrogen in the urea.
Claim 21
Dependent Claim
36 words
The process of claim 15 which further comprises adding a non-ionic surfactant having a cloud point of 140° F. (60° C.) or higher in the amount of about 0.1% to 5% by weight of said dispersion.
Claim 22
Dependent Claim
23 words
The process of claim 15 wherein said higher aldehyde is acetaldehyde and the mole ratio of formaldehyde to acetaldehyde is 3:1 to 19:1.
Claim 23
Dependent Claim
24 words
The process of claim 15 wherein said higher aldehyde is propionaldehyde and the mole ratio of formaldehyde to propionaldehyde is from 3:1 to 49:1.
Claim 24
Dependent Claim
17 words
The process of claim 15 wherein the amount of thickener-suspending agent is from about 0.03% to 0.1%.
Claim 25
Dependent Claim
12 words
A product comprising the dispersion prepared by the process of claim 1.
Claim 26
Dependent Claim
12 words
A product comprising the dispersion prepared by the process of claim 6.
Claim 27
Dependent Claim
12 words
A product comprising the dispersion prepared by the process of claim 15.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |