US3889417A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing horticultural foam structures
Assignee: WR Grace and Co
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Filing: 1974-05-16
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Granted: 1975-06-17
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Expires: 1994-05-16
Abstract
Abstract The invention disclosed provides a method for preparing horticultural foam structures. A foam sheet prepared by reacting an isocyanate capped polyoxyethylene polyol reactant with large amounts of an aqueous reactant is used as a carrier for pesticides, herbicides, seeds or the like. Desirably, the foam sheet further includes a support material for the foam sheet, the resultant composite foam structure provides an effective means for protecting dormant seeds, for sustaining seed germination plant growth, or optionally for controlled release of pesticides and/or herbicides.
Inventors
- 👤 Louis Leonard Wood
- 👤 Kurt Charles Frisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:55
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; A; A01; A01C; A01C1/00; A01C1/04; A01C1/046; A01G; A01G24/00; A01G24/20; A01G24/30; A01G24/40; A01G24/44; A01G24/48; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G2110/00; C08G2110/0083; C08G2310/00; C08J2375/00; C08J2375/04; C08J2375/08; Y; Y10; Y10S; Y10S521/00; Y10S521/905
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
66 words
A METHOD FOR PREPARING IMPROVED CROSSLINKED HYDROPHILIC FOAM STRUCTURE SAID METHOD COMPRISING REACTING AS A CONTINUOUS SHEET, A FIRST COMPONENT COMPRISING ISOCYANATE CAPPED POLYOXYETHYLENE POLYOL HAVING A REACTION FUNCTIONALITY GREATER THAN TWO, WITH A SECOND COMPONENT COMPRISING AQUEOUS REACTANT IN THE PRESENCE OF A HORTICULTURAL MATERIAL, THE RATIO OF MOLES H2O/MOLES NCO GROUPS BEING ABOUT 6.5 TO ABOUT 390 IN SAID SECOND AND FIRST COMPONENTS RESPECTIVELY.
Claim 2
Independent Claim
66 words
A METHOD FOR PREPARING IMPROVED CROSSLINKED HYDROPHILIC FOAM STRUCTURE SAID METHOD COMPRISING REACTING AS A CONTINUOUS SHEET, A FIRST COMPONENT COMPRISING ISOCYANATE CAPPED POLYOXYETHYLENE POLYOL HAVING A REACTION FUNCTIONALITY GREATER THAN TWO, WITH A SECOND COMPONENT COMPRISING AQUEOUS REACTANT IN THE PRESENCE OF A HORTICULTURAL MATERIAL, THE RATIO OF MOLES H2O/MOLES NCO GROUPS BEING ABOUT 6.5 TO ABOUT 390 IN SAID SECOND AND FIRST COMPONENTS RESPECTIVELY.
Claim 3
Dependent Claim
58 words
The method of claim 1 wherein the capped polyoxyethylene polyol is present in the first component in an amount from about 3% by weight up to 100% by weight, and wherein a capped polyoxyethylene polyol having a terminal member with an isocyanate functionality of two is present in an amount from 0% up to about 97% by weight.
Claim 4
Dependent Claim
18 words
The method of claim 2 wherein a biodegradable fabric is disposed continuously onto the continuous sheet of foam.
Claim 5
Dependent Claim
37 words
The method of claim 1 wherein the polyoxyethylene polyol moiety of the isocyanate capped member has a weight average molecular weight of about 200 to about 20,000, and a hydroxyl functionality of about 2 to about 8.
Claim 6
Dependent Claim
17 words
The method of claim 4 wherein the weight average molecular weight is about 600 to about 6,000.
Claim 7
Dependent Claim
20 words
The method of claim 1 wherein the ratio of moles H2O/moles NCO groups is from about 1 to about 200.
Claim 8
Dependent Claim
18 words
The method of claim 1 wherein a biodegradable fabric is disposed on one side of the foam sheet.
Claim 9
Dependent Claim
30 words
The method of claim 1 wherein a fabric is disposed along one side of the continuous sheet, said fabric being selected from the group consisting of paper, plastic and cloth.
Claim 10
Dependent Claim
16 words
The method of claim 1 wherein the horticultural material comprises seeds disposed within the continuous sheet.
Claim 11
Dependent Claim
19 words
The method of claim 1 wherein the horticultural material comprises seeds adhesively secured onto the continuous sheet of foam.
Claim 12
Independent Claim
85 words
A method for preparing improved crosslinked hydrophilic foam structure, said method comprising reacting as a continuous sheet, first component comprising isocyanate capped polyoxyethylene polyol having a reaction functionality equal to about two with a second component comprising aqueous reactant, and a third component comprising a crosslinked agent having a reaction functionality greater than two, the ratio of moles H2O/moles NCO groups being about 6.5 to about 390 in said second and first components respectively, the reaction being effected in the presence of a horticultural material.
Claim 13
Independent Claim
85 words
A method for preparing improved crosslinked hydrophilic foam structure, said method comprising reacting as a continuous sheet, first component comprising isocyanate capped polyoxyethylene polyol having a reaction functionality equal to about two with a second component comprising aqueous reactant, and a third component comprising a crosslinked agent having a reaction functionality greater than two, the ratio of moles H2O/moles NCO groups being about 6.5 to about 390 in said second and first components respectively, the reaction being effected in the presence of a horticultural material.
Claim 14
Dependent Claim
16 words
The method of claim 11 wherein the crosslinking agent of the third component is a polyol.
Claim 15
Dependent Claim
16 words
The method of claim 11 wherein the crosslinking agent of the third component is a polythiol.
Claim 16
Dependent Claim
16 words
The method of claim 11 wherein the crosslinking agent of the third component is a polyisocyanate.
Claim 17
Dependent Claim
16 words
The method of claim 11 wherein the crosslinking agent of the third component is a polyamine.
Claim 18
Dependent Claim
36 words
The method of claim 11 wherein the polyoxyethylene polyol moiety of the isocyanate capped member has an average molecular weight of about 200 to about 20,000, and a hydroxyl functionality of about 2 to about 8.
Claim 19
Dependent Claim
16 words
The method of claim 11 wherein the weight average molecular weight is about 600 to 6,000.
Claim 20
Dependent Claim
20 words
The method of claim 11 wherein the ratio of moles H2O/moles NCO groups is from about 20 to about 200.
Claim 21
Dependent Claim
31 words
The method of claim 11 wherein a fabric is disposed continuously onto one side of the foam sheet, said fabric being selected from the group consisting of paper, plastic and cloth.
Claim 22
Dependent Claim
20 words
The method of claim 11 wherein the horticultural material is seeds adhering to the surface of the foam support layer.
Claim 23
Dependent Claim
15 words
The method of claim 11 wherein the horticultural material comprises seeds disposed within the foam.
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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |