US3894994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous method of making polyurethane powder
Assignee: DVSG Holding GmbH
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Filing: 1973-09-20
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Granted: 1975-07-15
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Expires: 1993-09-20
Abstract
Abstract Continuous method for preparing polyurethane resin directly in finely divided form in which method a plurality of reagents which combine to form polyurethane resin, and of which at least one is a liquid, and an inert organic liquid reaction medium in which at least one of the reagents and the polyurethane resin are insoluble and continuously mixed and vigorously agitated to form a fine dispersion of the insoluble reagent or reagents in the inert liquid, portions of the resulting dispersion are continuously discharged after a residence mixing and agitation time for reaction to thicken the dispersed material by conversion to polyurethane prior to discharge, reaction of the dispersed material discharged is continued under conditions which retard settling of the dispersed material substantially to complete the reaction between the reagents to form fine particles of polyurethane resin and the polyurethane resin particles are separated from the inert liquid.
Inventors
- 👤 John T Day
- 👤 John G Hollick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:08
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0838; C08G18/0842; C08G18/0861; C08G18/0871; Y; Y10; Y10S; Y10S528/00; Y10S528/902
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
207 words
CONTINUOUS METHOD FOR PREPARING POLYURETHANE RESIN DIRECTLY IN FINELY DIVIDED FROM REACTION IN A MIXTURE OF WHICH THE COMPONENTS INCLUDE A FIRST REACTANT COMPRISING AT LEAST ONE ORGANIC POLUISOCYANATE, A SECOND REACTANT COMPRISING AT LEAST ONE ORGANIC COMPOUND CONTAINING AT LEAST TWO GROUPS HAVING ACTIVE HYDROGEN, A CATALYST FOR THE POLYURETHANE FORMING REACTION, AT LEAST ONE OF SAID REACTANTS BEING A LIQUID UNDER REACTION CONDITIONS, AND AN INERT ORGANIC LIQUID REACTION MEDIUM IN WHICH ONE OF THE REACTANTS AND THE POLYURETHANE RESIN ARE INSOLUBLE, IN WHICH METHOD SAID INSOLUBLE REACTANT IS CONTINUOUSLY DISPERSED WITH VIGOROUS AGITATION IN SAID INERT LIQUID IN A MIXING ZONE TO FORM A BODY OF A DISPERSION OF SAID INSOLUBLE REACTANT IN A CONTINUOUS PHASE OF THE INERT LIQUID, PORTIONS OF SAID DISPERSION ARE CONTINUOUSLY DISCHARGED FROM SAID BODY TO A FURTHER MIXING ZONE, A FURTHER COMPONENT OR FURTHUR COMPONENTS OF THE REACTION MIXTURE FOR FORMING POLYURETHANE IS OR ARE SUPPLIED CONTINUOUSLY RO SAID FURTHER MIXING ZONE AT A CORRELATED WITH THE RATE OF SUPPLY OF INSOLUBLE REACTANT TO GIVE RELATIVE PROPORTIONS FOR REACTION TO FORM POLYURETHANE AND IS OR ARE MIXED BY VIGOROUS AGITATION WITH SAID DISPERSION, PORTIONS OF THE MIXTURE IN SAID FURTHER MIXING ZONE ARE CONTINUOUSLY DISCHARGED AFTER A RESIDENCE
Claim 2
Dependent Claim
207 words
CONTINUOUS METHOD FOR PREPARING POLYURETHANE RESIN DIRECTLY IN FINELY DIVIDED FROM REACTION IN A MIXTURE OF WHICH THE COMPONENTS INCLUDE A FIRST REACTANT COMPRISING AT LEAST ONE ORGANIC POLUISOCYANATE, A SECOND REACTANT COMPRISING AT LEAST ONE ORGANIC COMPOUND CONTAINING AT LEAST TWO GROUPS HAVING ACTIVE HYDROGEN, A CATALYST FOR THE POLYURETHANE FORMING REACTION, AT LEAST ONE OF SAID REACTANTS BEING A LIQUID UNDER REACTION CONDITIONS, AND AN INERT ORGANIC LIQUID REACTION MEDIUM IN WHICH ONE OF THE REACTANTS AND THE POLYURETHANE RESIN ARE INSOLUBLE, IN WHICH METHOD SAID INSOLUBLE REACTANT IS CONTINUOUSLY DISPERSED WITH VIGOROUS AGITATION IN SAID INERT LIQUID IN A MIXING ZONE TO FORM A BODY OF A DISPERSION OF SAID INSOLUBLE REACTANT IN A CONTINUOUS PHASE OF THE INERT LIQUID, PORTIONS OF SAID DISPERSION ARE CONTINUOUSLY DISCHARGED FROM SAID BODY TO A FURTHER MIXING ZONE, A FURTHER COMPONENT OR FURTHUR COMPONENTS OF THE REACTION MIXTURE FOR FORMING POLYURETHANE IS OR ARE SUPPLIED CONTINUOUSLY RO SAID FURTHER MIXING ZONE AT A CORRELATED WITH THE RATE OF SUPPLY OF INSOLUBLE REACTANT TO GIVE RELATIVE PROPORTIONS FOR REACTION TO FORM POLYURETHANE AND IS OR ARE MIXED BY VIGOROUS AGITATION WITH SAID DISPERSION, PORTIONS OF THE MIXTURE IN SAID FURTHER MIXING ZONE ARE CONTINUOUSLY DISCHARGED AFTER A RESIDENCE
Claim 3
Dependent Claim
75 words
Continuous method for preparing finely divided polyurethane resin directly as defined in claim 1 in which components of said reaction mixture are continuously introduced into a body of mixed components in a first mixing zone, said body of components is circulated for repeated rapid shearing agitation mixing of each portion of the body in said zone to incorporate said introduced components throughout said body and portions of said body are continuously discharged from said zone.
Claim 4
Dependent Claim
111 words
Continuous method for preparing finely divided polyurethane resin directly as defined in claim 2 in which mixing and agitation are effected in a series of zones, in which a surfactant is employed to aid in dispersion of said insoluble reactant or reactants in said inert organic liquid reaction medium, and in which portions of said body of mixed components discharged from said first zone are continuously introduced into a body of mixed components in at least one successive mixing zone and circulated for repeated rapid shearing agitation mixing of each portion of the body of components, and portions of the body of mixed components in each successive zone are discharged continuously.
Claim 5
Dependent Claim
114 words
Continuous method for preparing finely divided polyurethane resin directly as defined in claim 3 in which the rate of introduction per minute of reaction mixture components is from about 0.5 to about 2.0 times the volume of mixed components in the mixing zone in which organic compound containing at least two groups having reactive hydrogen is brought together with the reactant comprising at least one organic polyisocyanate so that the average dwell in the reaction chamber is from 2 minutes to 1/2 minute to cause reaction between the organic compound having active hydrogen and the polyisocyanate to thicken the dispersed reactant material by formation of polyurethane at the time of withdrawal from said zone.
Claim 6
Dependent Claim
128 words
Continuous method for preparing finely divided polyurethane resin directly as defined in claim 3 in which the components continuously introduced into said first mixing zone include said inert organic liquid reaction medium and at least one organic compound insoluble in said inert liquid and containing at least two groups having active hydrogen, mixing in said zone forms an emulsion of droplets of saiD insoluble organic compounds with said inert liquid as the continuous phase, said emulsion is continuously discharged from said first mixing zone and introduced into a second mixing zone and in which at least one organic polyisocyanate is introduced into said second mixing zone for mixing with the body of components and reaction with the organic compound of said droplets to form fine particles of polyurethane.
Claim 7
Dependent Claim
162 words
Continuous method for preparing finely divided polyurethane resin as defined in claim 4 in which the components continuously introduced into said first mixing zone include said inert organic liquid reaction medium, a chain extender comprising an -OH terminated organic compound having a molecular weight of from about 60 to about 300 and a member of the group consisting of polyalkylene ether glycols and hydroxyl terminated polyesters, said chain extender and said polyalkylene ether glycol and hydroxyl terminated polyesters being insoluble in said inert liquid, said shearing agitation mixing forms an emulsion of droplets less than 150 microns in size with said inert liquid medium as the continuous phase, said emulsion is continuously discharged from said first mixing zone and introduced into a second mixing zone and in which at least one organic polyisocyanate is introduced into said second mixing zone for mixing with the body of components and reaction with the organic compound of said droplets to form fine particles of polyurethane.
Claim 8
Dependent Claim
134 words
Continuous method for preparing finely divided polyurethane resin directly as defined in claim 3 in which said reactant comprising polyisocyanate and reactant comprising an organic compound containing at least two groups having active hydrogen are continuously introduced into said first agitation mixing zone and discharged from said zone as a uniform mixture, the mixture discharged from said first zone and inert organic liquid reaction medium are continuously introduced into a body of a mixture of these components in a succeeding mixing zone and combined to form an emulsion of droplets of said mixture having a size less than 150 microns, and a catalyst is supplied to said succeeding mixing zone to give a speed of reaction between said polyisocyanate and said compound having active hydrogen to thicken the droplets at the time of discharge.
Claim 9
Dependent Claim
162 words
Continuous method for preparing finely divided polyurethane resin directly as defined in claim 4 in which polyisocyanate and a member of the group consisting of polyalkylene ether glycols and hydroxyl terminated polyesters are continuously introduced into said first agitation mixing zone and discharged from said zone as a uniform mixture, the mixture is discharged from said first zone, a chain extender comprising an organic compound having at least two active hydrogens and having a molecular weight of from about 60 to about 300 and inert organic liquid reaction medium are continuously introduced into a body of a mixture of these components in a succeeding mixing zone and combined to form an emulsion of droplets of said mixture having a size less than 150 microns and a catalyst is supplied to give a speed of reaction between said polyisocyanate, said polyester or polyalkylene ether glycol and said chain extender to thicken the droplets at the time of discharge from said succeeding mixing zone.
Claim 10
Dependent Claim
127 words
Continuous method for preparing finely divided polyurethane resin directly as defined in claim 3 in which said reactant comprising polyisocyanate, reactant comprising an organic compound comtaining at least two groups having active hydrogen and inert organic liquid reaction medium in which at least one of said reactants and the polyurethane resin are insoluble are continuously introduced into said first agitation mixing zone and combined to form an emulsion of droplets having a size less than 150 microns with said inert liquid as the continuous phase, catalyst is supplied continuously to give a speed of reaction between said reactants to thicken thE droplets and the emulsion discharged from said first zone is continuously introduced into a body of a mixture of these components in a succeeding mixing zone.
Claim 11
Dependent Claim
116 words
Continuous method for preparing finely divided polyurethane resin directly as defined in claim 4 in which polyisocyanate, a member of the group consisting of polyalkylene ether glycols and hydroxyl terminated polyesters and inert organic liquid reaction medium in which said glycol and polyester are continuously introduced into said first agitation mixing zone and combined to form an emulsion droplets of having a size less than 150 microns with said inert liquid as the continuous phase, catalyst is supplied for the reaction between said polyisocyanate and said glycol or hydroxyl terminated polyester and the emulsion discharged from said first zone is continuously introduced into a body of a mixture of these components in a succeeding mixing zone.
Claim 12
Dependent Claim
171 words
Continuous method for preparing finely divided polyurethane resin directly as defined in claim 3 in which a member of the group consisting of polyalkylene ether glycols and hydroxyl terminated polyesters and a polyisocyanate are continuously introduced into said first mixing zone in a molar ratio providing an -NCO to -OH ratio about 2:1, an inert organic liquid reaction medium in which said polyalkylene ether glycol and polyester are insoluble is continuously introduced and mixed with said glycol or polyester and polyisocyanate by shearing agitation to form an emulsion of droplets less than 150 microns in size with said inert liquid medium as the continuous phase, said emulsion is continuously discharged and introduced into a second mixing zone and a chain extender comprising an organic compound having at least two active hydrogens and having a molecular weight of from about 60 to about 300 is introduced into said second mixing zone for reaction with the available -NCO groups of the product from said first mixing zone to form fine particles of polyurethane.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |