US4276077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lignosulfonate-based graft polymers their preparation and uses
Assignee: Technion Research and Development Foundation Ltd
•
Filing: 1979-12-31
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Granted: 1981-06-30
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Expires: 1999-12-31
Abstract
Abstract The present invention relates to a method for improving a soil structure by stabilization of aggregates and to the reagents used therefor. The reagents used are graft polymers obtained from crude lignosulfonate and monomer selected from the group consisting of vinyl cyanide (acrylonitrile), vinyl acetate, hydrolized vinyl acetate and acrylamide or combinations thereof, at a pH range of between 2 and 6 in the presence of an initiator. The reagents obtained according to the invention are true solutions and are characterized by their low viscosity. They can be used in solution, emulsion or suspension either by spraying alone or admixed with fertilizers, pesticides or combined with the operation of planting and soil stabilization. The reagents can be easily manufactured, being stable for prolonged periods of time. They possess outstanding properties as soil conditioners.
Inventors
- 👤 Dan Zaslavsky
- 👤 Lev V. Rozenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:06
CPC Classifications
C; C08; C08F; C08F289/00; Y; Y10; Y10S; Y10S47/00; Y10S47/10
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
50 words
A soil conditioner produced by the exothermic reaction of graft polymerization of crude lignosulfonate with a monomer selected from the group consisting of vinyl cyanide, vinyl acetate, hydrolized vinyl acetate and acrylamide or combinations thereof at a pH range of between 2 and 6 in the presence of an initiator.
Claim 2
Dependent Claim
50 words
A soil conditioner produced by the exothermic reaction of graft polymerization of crude lignosulfonate with a monomer selected from the group consisting of vinyl cyanide, vinyl acetate, hydrolized vinyl acetate and acrylamide or combinations thereof at a pH range of between 2 and 6 in the presence of an initiator.
Claim 3
Dependent Claim
18 words
A soil conditioer produced in accordance with claim 1, wherein the lignosulfonate utilized is substantially free of polysaccharides.
Claim 4
Dependent Claim
18 words
A soil conditioner produced in accordance with claim 1, wherein the pH range is between 3 to 5.
Claim 5
Dependent Claim
29 words
A soil conditioner produced in accordance with claim 1, wherein said graft polymerization of the crude lignosulfonate is carried out simultaneously with two or more of the said monomers.
Claim 6
Dependent Claim
29 words
A soil conditioner produced in accordance with claim 4, wherein the graft polymerization of the crude lignosulfonate is carried out with one of said monomers and an acrylic monomer.
Claim 7
Dependent Claim
30 words
A soil conditioner produced in accordance with claim 5, wherein the ratio between the vinylic and acrylic monomer together to the lignosulfonate is in the range of 1:0.8 to 1:8.
Claim 8
Dependent Claim
32 words
A soil conditioer produced in accordance with claim 4, wherein the graft polymerization of the crude lignosulfonate is carried out first with one monomer followed by a graft polymerization with another monomer.
Claim 9
Dependent Claim
27 words
A soil conditioner produced in accordance with claim 1, wherein the weight ratio between the vinylic monomer and lignosulfonate is in the range of 1:0.8 to 1:8.
Claim 10
Dependent Claim
19 words
A soil conditioner produced in accordance with claim 1, wherein the pH adjustment is carried out with acrylic acid.
Claim 11
Dependent Claim
18 words
A soil conditioner produced in accordance with claim 1, wherein the initiator used is of the peroxide type.
Claim 12
Dependent Claim
25 words
A soil conditioner produced in accordance with claim 10, wherein the peroxide used is selected from the group consisting of cumene hydroperoxide and hydrogen peroxide.
Claim 13
Dependent Claim
21 words
A soil conditoner produced in accordance with claim 1, wherein the soil conditioner obtained is subsequently partially or totally alkaline hydrolised.
Claim 14
Dependent Claim
28 words
A soil conditioner produced in accordance with claim 12, wherein the alkaline hydrolysis is performed with an aqueous solution of NaOH, KOH, Ca(OH) 2 or NH 4 OH.
Claim 15
Dependent Claim
17 words
A soil conditioner produced in accordance with claim 1, wherein the product is dried to a powder.
Claim 16
Dependent Claim
25 words
A method for improving the soil structure by stabilization of aggregates which consists in the application of a soil conditioner obtained according to claim 1.
Claim 17
Dependent Claim
10 words
A method according to claim 15, carried out by spraying.
Claim 18
Dependent Claim
13 words
A method according to claim 15, carried out simultaneously with the fertilizer application.
Claim 19
Dependent Claim
16 words
A method according to claim 15, carried out in combination with application of pesticides or herbicides.
Claim 20
Dependent Claim
14 words
A method according to claim 15, carried out simultaneously with the planting of seeds.
Claim 21
Dependent Claim
18 words
A method according to claim 15, carried out in combination with spreading of seeds and solid mulching materials.
Claim 22
Dependent Claim
12 words
A method according to claim 15, carried out through the irrigation water.
References Cited (Backward Citations)
US3370935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-29 | 1984-12-29 | 1985-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-29 | 1988-12-29 | 1989-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-29 | 1992-12-29 | 1993-06-30 | $7700.00 | Window Closed / Lapsed |