US3963710A
Expired / Lapsed
US
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Finely divided blocked isocyanates prepared in the presence of surfactants
Assignee: EIDP Inc
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Filing: 1974-08-28
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Granted: 1976-06-15
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Expires: 1994-08-28
Abstract
Abstract A process for the preparation of blocked polyisocyanate powders consisting of reacting the polyisocyanate and blocking agent in solution in the presence of a surfactant, whereby the product precipitates in extremely finely divided form.
Inventors
- 👤 Carl Albert Aufdermarsh, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:38
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/16; C07D295/20; C07D295/215; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; Y; Y10; Y10S; Y10S528/00; Y10S528/902
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
60 words
A process for the preparation of finely divided blocked isocyanates consisting of reacting a polyisocyanate and an active hydrogen-containing compound, or mixture of compounds, selected from the group consisting of a primary alcohol, a secondary alcohol, a secondary amine, and a phenolic compound in solution in the presence of a surfactant, whereupon the product precipitates in exceptionally finely divided form.
Claim 2
Dependent Claim
60 words
A process for the preparation of finely divided blocked isocyanates consisting of reacting a polyisocyanate and an active hydrogen-containing compound, or mixture of compounds, selected from the group consisting of a primary alcohol, a secondary alcohol, a secondary amine, and a phenolic compound in solution in the presence of a surfactant, whereupon the product precipitates in exceptionally finely divided form.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the surfactant is a nonionic surfactant.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the surfactant is an olefin/vinylpyrrolidone copolymer.
Claim 5
Dependent Claim
22 words
The process of claim 3 wherein the surfactant is a copolymer containing 20% by weight vinylpyrrolidone and 80% by weight of eicosene-1.
Claim 6
Dependent Claim
10 words
The process of claim 1 wherein the solvent is trichloroethylene.
Claim 7
Dependent Claim
19 words
The process of claim 1 wherein the polyisocyanate is diphenylmethane-4,4'-diisocyanate, and the active hydrogen-containing compound is a phenolic compound.
Claim 8
Dependent Claim
20 words
The process of claim 6 wherein said phenolic compound is selected from the group consisting of phenol, resorcinol and naphthol.
Claim 9
Dependent Claim
15 words
The process of claim 1 wherein said active hydrogen-containing compound is a secondary aliphatic amine.
Claim 10
Dependent Claim
13 words
The process of claim 8 wherein the secondary amine is morpholine or dibutylamine.
Claim 11
Dependent Claim
25 words
The process of claim 1 wherein said active hydrogen-containing compound is a mixture of resorcinol and 2-20 equivalent wt. % of an aliphatic hydroxyl-containing material.
Claim 12
Dependent Claim
62 words
The process for the preparation of finely divided blocked polyisocyanates consisting of reacting an aromatic polyisocyanate and an active hydrogen-containing compound, or mixture of compounds, selected from a group consisting of a primary alcohol, a secondary alcohol, a secondary amine, and a phenolic compound in solution in an inert solvent containing a surfactant, whereupon the product precipitates in exceptionally finely divided form.
Claim 13
Dependent Claim
62 words
The process for the preparation of finely divided blocked polyisocyanates consisting of reacting an aromatic polyisocyanate and an active hydrogen-containing compound, or mixture of compounds, selected from a group consisting of a primary alcohol, a secondary alcohol, a secondary amine, and a phenolic compound in solution in an inert solvent containing a surfactant, whereupon the product precipitates in exceptionally finely divided form.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |