US3906019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of di(isocyanato-tolyl) urea
Assignee: Motors Liquidation Co
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Filing: 1974-04-25
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Granted: 1975-09-16
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Expires: 1994-04-25
Abstract
Abstract Water and toluene diisocyanate (TDI) are rapidly and thoroughly mixed to produce a di(isocyanato-tolyl) urea monomer which is used in the preparation of polyurethane resins. A sufficient excess of either reactant, with respect to stoichiometry, is required to provide a suspension medium having a relatively low viscosity; this allows the continued vigorous stirring of the reactants and the product. The expected polymerization reaction which would form undesirable higher molecular weight ureas is prevented by the extreme immiscibility of the monomeric urea in either water or toluene diisocyanate (TDI). The desired monomer precipitates and is the final product of this reaction.
Inventors
- 👤 Gregory A Campbell
- 👤 Thomas J Dearlove
- 👤 William C Meluch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:27
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/18; C07C273/1809; C07C273/1818; C07C273/1827; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/7806; C08G18/7818; C08G18/7825; C08G18/80; C08G18/8003; C08G18/8045
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
A METHOD OF PREPARING A DI(ISOCYANATO-TOLYL) UREA IN SUBSTANTIALLY MONOMERIC FORM COMPRISING: RAPIDLY AND THROUGHLY MIXING LIQUID WATER AND TOLUENE DIISOCUANATE IN A REACTION VESSEL AT A TEMPERATURE IN THE RANGE OF FROM ROOM TEMPERATURE TO ABOUT 40*C. TO FORM SAID UREA, WITH SAID WATER AND SAID DIISOCYNATE BEING IMMISCIBLE AND ORMING TWO LIQUID PHASE IN SAID MIXTURE FROM WHICH SAID UREA SEPARATES AS A SOLID PRODUCT AS IT IS FORMED, THERE BEING A STOICHIO ERIC EXCESS OF EITHER SAID WATER OR SAID DIISOCYNATE WHICH SERVES AS A SUSPENSION MEDIUM FOR THE OTHER LIQUID REACTAT AND THE SOLID PRODUCT, AND SEPARATING SAID UREA FROM SAID MEDIUM.
Claim 2
Independent Claim
106 words
A METHOD OF PREPARING A DI(ISOCYANATO-TOLYL) UREA IN SUBSTANTIALLY MONOMERIC FORM COMPRISING: RAPIDLY AND THROUGHLY MIXING LIQUID WATER AND TOLUENE DIISOCUANATE IN A REACTION VESSEL AT A TEMPERATURE IN THE RANGE OF FROM ROOM TEMPERATURE TO ABOUT 40*C. TO FORM SAID UREA, WITH SAID WATER AND SAID DIISOCYNATE BEING IMMISCIBLE AND ORMING TWO LIQUID PHASE IN SAID MIXTURE FROM WHICH SAID UREA SEPARATES AS A SOLID PRODUCT AS IT IS FORMED, THERE BEING A STOICHIO ERIC EXCESS OF EITHER SAID WATER OR SAID DIISOCYNATE WHICH SERVES AS A SUSPENSION MEDIUM FOR THE OTHER LIQUID REACTAT AND THE SOLID PRODUCT, AND SEPARATING SAID UREA FROM SAID MEDIUM.
Claim 3
Independent Claim
89 words
A method of preparing a di(isocyanato-tolyl) area in substantially monomeric form comprising: a. rapidly and thoroughly mixing and reacting from 20 to 40 parts by weight toluene diisocyanate and from 5 to 15 parts by weight of liquid water in a reaction vessel at a temperature in the range of from about 30* C. to about 40* C. wherein the unreacted constituents serve as the suspension medium for said reaction, and said urea precipitating from said medium as it is formed, and b. separating said urea from said medium.
Claim 4
Independent Claim
89 words
A method of preparing a di(isocyanato-tolyl) area in substantially monomeric form comprising: a. rapidly and thoroughly mixing and reacting from 20 to 40 parts by weight toluene diisocyanate and from 5 to 15 parts by weight of liquid water in a reaction vessel at a temperature in the range of from about 30* C. to about 40* C. wherein the unreacted constituents serve as the suspension medium for said reaction, and said urea precipitating from said medium as it is formed, and b. separating said urea from said medium.
Claim 5
Independent Claim
110 words
A method of preparing a di(isocyanato-tolyl) area in substantially monomeric form comprising: a. rapidly and thoroughly mixing and reacting from 20 to 40 parts by weight toluene diisocyanate and from 5 to 15 parts by weight of liquid water and from 0.5 to 1.0 part by weight of a catalyst, said catalyst being either a Lewis base or a Lewis acid, in a reactional vessel, at a temperature in the range of from room temperature to about 40* C. wherein the unreacted constituents serve as the suspension medium for said reaction, and said urea precipitating from said medium as it is formed, and b. separating said urea from said medium.
Claim 6
Independent Claim
110 words
A method of preparing a di(isocyanato-tolyl) area in substantially monomeric form comprising: a. rapidly and thoroughly mixing and reacting from 20 to 40 parts by weight toluene diisocyanate and from 5 to 15 parts by weight of liquid water and from 0.5 to 1.0 part by weight of a catalyst, said catalyst being either a Lewis base or a Lewis acid, in a reactional vessel, at a temperature in the range of from room temperature to about 40* C. wherein the unreacted constituents serve as the suspension medium for said reaction, and said urea precipitating from said medium as it is formed, and b. separating said urea from said medium.
References Cited (Backward Citations)
US2757184A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |