US4245432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seed coatings
Assignee: Eastman Chemical Co
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Filing: 1979-07-25
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Granted: 1981-01-20
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Expires: 1999-07-25
Abstract
Abstract Disclosed are plant seed coating compositions comprising water insoluble but water sensitive polyelectrolyte complexes. The polyelectrolyte complexes, which are formed by combining an acidic polymer with a basic polymer, provide protection for the seeds and may be used as a carrier for materials such as fertilizers, herbicides, pesticides, etc. An important feature is the fact that the polyelectrolyte complex does not dissolve when contacted with water. Instead, it swells and falls away, thereby disrupting the coating, and the swelling and falling away continue until the coating is removed. An advantage of such a coating is that there is no dissolved material available to fill the pores of the seeds to thereby retard germination. The coating quickly disintegrates upon contact with water for releasing any carried substances and exposes the seeds to their natural environment.
Inventors
- 👤 Clarence C. Dannelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:32
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/006; A; A01; A01C; A01C1/00; A01C1/06; A01N; A01N25/00; A01N25/08; A01N25/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
42 words
A plant seed having a substantially continuous coating on the surface thereof, said coating comprising a polyelectrolyte complex of an acidic polymer and basic polymer, said polyelectrolyte complex being water insoluble, but adapted to swell and disintegrate when in contact with water.
Claim 2
Dependent Claim
42 words
A plant seed having a substantially continuous coating on the surface thereof, said coating comprising a polyelectrolyte complex of an acidic polymer and basic polymer, said polyelectrolyte complex being water insoluble, but adapted to swell and disintegrate when in contact with water.
Claim 3
Dependent Claim
17 words
A plant seed according to claim 1 wherein said acidic polymer contains at least one carboxyl group.
Claim 4
Dependent Claim
15 words
A plant seed according to claim 1 wherein said basic polymer contains an amino group.
Claim 5
Dependent Claim
27 words
A plant seed according to claim 1 wherein said acidic polymer contains at least one carboxyl group and said basic polymer contains at least one amino group.
Claim 6
Dependent Claim
37 words
A plant seed according to claim 1 wherein said acidic polymer contains at least 5 parts by weight of a carboxylic, sulfuric, sulfonic, phosphoric or phosphonic acid moiety or ionizable salt thereof per 1000 parts of polymer.
Claim 7
Dependent Claim
29 words
A plant seed according to claim 1 wherein said basic polymer contains at least 2 parts by weight of a basic amino nitrogen per 1000 parts of said polymer.
Claim 8
Dependent Claim
35 words
A plant seed according to claim 1 wherein said basic polymer contains at least 2 parts by weight of ionizable salts or quaternary ammonium complexes of basic amino nitrogen per 1000 parts of said polymer.
Claim 9
Dependent Claim
31 words
A plant seed according to claim 1 wherein the polyelectrolyte complex resulting from the combination of said acidic and basic polymers has a pH of from about 5 to about 8.
Claim 10
Dependent Claim
33 words
A plant seed according to claim 1 wherein said basic polymer is selected from poly N,N-diethyl aminoethyl acrylate, poly-2-methyl-5-vinylpyridine, cellulose propionate morpholino butyrate and polypeptides having an isoelectric point greater than about 17.
Claim 11
Dependent Claim
30 words
A plant seed according to claim 1 wherein said coating contains at least one substance selected from the group consisting of fungicides, bactericides, herbicides, pesticides, fertilizers, growth promoters and hormones.
Claim 12
Independent Claim
42 words
The method of treating plant seeds which comprises applying as a coating to the seeds a polyelectrolyte complex of an acidic polymer and basic polymer, said polyelectrolyte complex being water insoluble, but adapted to swell and disintegrate when in contact with water.
Claim 13
Independent Claim
42 words
The method of treating plant seeds which comprises applying as a coating to the seeds a polyelectrolyte complex of an acidic polymer and basic polymer, said polyelectrolyte complex being water insoluble, but adapted to swell and disintegrate when in contact with water.
Claim 14
Dependent Claim
19 words
The method of claim 11 wherein said coating has a thickness of between about 0.5 to about 10 mils.
Claim 15
Dependent Claim
17 words
The method of claim 11 wherein said coating contains a substance which is beneficial to said seeds.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |