US4282344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane curing agent dispersion, process and product
Assignee: Uniroyal Chemical Co Inc
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Filing: 1979-11-21
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Granted: 1981-08-04
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Expires: 1999-11-21
Abstract
Abstract To a dispersion of a complex of 3 moles of 4,4'-methylenedianiline with 1 mole of a specified inorganic salt in an inert liquid, which still contains some free methylenedianiline, there is added, with agitation, at least 0.5 equivalent of an organic isocyanate per equivalent of free methylenedianiline. Then, there is added, while continuing agitation, at least 0.5 weight % of lecithin. The resulting dispersion is a good curing agent for isocyanato-terminated polyurethane prepolymers. Compositions containing both the prepolymer and the curing agent of this invention have good shelf stability at room temperature and cure to polyurethane products having good physical properties and hydrolytic stability.
Inventors
- 👤 Paul P. Caruso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:06
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
149 words
A process for preparing a composition useful for curing an isocyanato-terminated polyurethane prepolymer, said process comprising (1) forming a mixture of a substantially inert organic liquid (A), with particles, (B), of a complex of 3 moles of 4,4'-methylenedianiline and 1 mole of a salt selected from the group: sodium chloride, sodium bromide, sodium iodide, lithium chloride, lithium bromide and lithium iodide, said particles having an average diameter of less than 60 microns; the weight proportion of liquid (A) in the mixture being about 20-90%, and that of particles (B) being about 10-80%, said mixture having a free methylenedianiline content of about 0.1-5% by weight; (2) adding to said mixture with good agitation at least 0.5 equivalent of an organic isocyanate per equivalent of the free methylenedianiline, (3) while continuing agitation, allowing said organic isocyanate to react with said methylenedianiline; and (4) adding at least 0.5 weight % of lecithin.
Claim 2
Dependent Claim
149 words
A process for preparing a composition useful for curing an isocyanato-terminated polyurethane prepolymer, said process comprising (1) forming a mixture of a substantially inert organic liquid (A), with particles, (B), of a complex of 3 moles of 4,4'-methylenedianiline and 1 mole of a salt selected from the group: sodium chloride, sodium bromide, sodium iodide, lithium chloride, lithium bromide and lithium iodide, said particles having an average diameter of less than 60 microns; the weight proportion of liquid (A) in the mixture being about 20-90%, and that of particles (B) being about 10-80%, said mixture having a free methylenedianiline content of about 0.1-5% by weight; (2) adding to said mixture with good agitation at least 0.5 equivalent of an organic isocyanate per equivalent of the free methylenedianiline, (3) while continuing agitation, allowing said organic isocyanate to react with said methylenedianiline; and (4) adding at least 0.5 weight % of lecithin.
Claim 3
Dependent Claim
24 words
The process of claim 1 wherein the proportion of the substantially inert liquid is 25-60% based on the combined weight of (A) and (B).
Claim 4
Dependent Claim
16 words
The process of claim 2 wherein the inert liquid has a boiling point above 200° C.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein the proportion of free methylenedianiline, prior to the addition of isocyanate is 0.4-3 weight %.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein the proportion of lecithin added in step (4) is 0.5-2 weight %.
Claim 7
Dependent Claim
14 words
The process of claim 5 wherein the proportion of lecithin is 0.7-1.7 weight %.
Claim 8
Dependent Claim
23 words
The process of claim 1 wherein the proportion of isocyanate added in step (2) is about 0.5-2.0 equivalents per equivalent of free methylenedianiline.
Claim 9
Dependent Claim
18 words
The process of claim 7 wherein the proportion of isocyanate is 0.5-1.0 equivalent per equivalent of free methylenedianiline.
Claim 10
Dependent Claim
126 words
A composition suitable for curing isocyanato-terminated polyurethane prepolymers, said composition comprising a substantially inert organic liquid, (A) and, dispersed in component (A), particles. (B), of a complex of 3 moles of 4,4'-methylenedianiline and 1 mole of a salt selected from the group: sodium chloride, sodium bromide, sodium iodide, lithium chloride, lithium bromide and lithium iodide; substantially no free methylenedianiline being present in said composition, free methylenedianiline having been removed by (1) adding to the initial dispersion of particles (B) in the liquid (A) with good agitation about 0.5 to 2.0 equivalents of an organic isocyanate per equivalent of the initially present free methylenedianiline; (2) while continuing agitation, allowing said organic isocyanate to react with said methylenedianiline; and (3) adding at least 0.5 weight percent of lecithin.
Claim 11
Dependent Claim
126 words
A composition suitable for curing isocyanato-terminated polyurethane prepolymers, said composition comprising a substantially inert organic liquid, (A) and, dispersed in component (A), particles. (B), of a complex of 3 moles of 4,4'-methylenedianiline and 1 mole of a salt selected from the group: sodium chloride, sodium bromide, sodium iodide, lithium chloride, lithium bromide and lithium iodide; substantially no free methylenedianiline being present in said composition, free methylenedianiline having been removed by (1) adding to the initial dispersion of particles (B) in the liquid (A) with good agitation about 0.5 to 2.0 equivalents of an organic isocyanate per equivalent of the initially present free methylenedianiline; (2) while continuing agitation, allowing said organic isocyanate to react with said methylenedianiline; and (3) adding at least 0.5 weight percent of lecithin.
Claim 12
Dependent Claim
22 words
A composition of claim 9 wherein the proportion of free methylenedianiline prior to the addition of the isocyanate is 0.3-4 weight percent.
Claim 13
Dependent Claim
18 words
A composition of claim 9 wherein the proportion of lecithin added in step (3) is 0.7-1.7 weight percent.
Claim 14
Dependent Claim
12 words
A curing composition of claim 9 wherein the isocyanate is tolylene diisocyanate.
Claim 15
Dependent Claim
33 words
A curable composition containing a composition of claim 9 and an isocyanato-terminated polyurethane prepolymer in such proportions that the curable composition contains about 0.7-1.2 equivalents of amine groups per equivalent of NCO groups.
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) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |