US3872049A
Expired / Lapsed
US
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Method for preparing urea urethane polymer particles
Assignee: Reichhold Chemicals Inc
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Filing: 1973-10-02
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Granted: 1975-03-18
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Expires: 1993-10-02
Abstract
Abstract Finely-divided, solid urea-urethane particles are prepared by combining under agitation and in an inert liquid reaction medium, a diamine and an isocyanate-terminated urethane prepolymer of a hydroxy-terminated polyester polyol and essentially hydrocarbon diisocyanate, to provide urea-urethane polymer, said liquid reaction medium containing aromatic hydrocarbon solvent which can swell urea-urethane polymer; and contacting said urea-urethane polymer with aliphatic or alicyclic hydrocarbon liquid to obtain finely-divided, solid urea-urethane particles.
Inventors
- 👤 Basil S Farah
- 👤 Henry A Kasprzak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:57
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0838; C08G18/0842; C08G18/0861; C08G18/0871; C08G18/10
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
71 words
A METHOD FOR PREPARING FINELY-DIVIDED, UREA-URETHANE PARTICLES COMPRISING COMBINING UNDER AGITATION AND IN AN INERT LIQUID, AROMATIC HYDROCARBON-CONTAINING REACTION MEDIUM, DIAMINE AND ISOCYANATE-TERMINATED URETHANE PREPOLYMER OF HYDROXY-TERMINATED POLYESTER POLYOL AND ESSENTIALLY HYDROCARBON DIISOCYANATE TO PROVIDE UREA-URETHANE POLYMER, SAID LIQUID REACTION MEDIUM CONTAINING SUFFICIENT AROMATIC HYDROCARBON SOLVENT WHICH SWELLS UREA-URETHANE POLYMER, TO DISSOLVE THE ISOCYANATE-TERMINATED URETHANE PREPOLYMER; AND CONTACTING THE UREA-URETHANE POLYMER WITH ALIPHATIC OR ALICYCLIC HYDROCARBON LIQUID TO OBTAIN UREA-URETHANE PARTICLES.
Claim 2
Independent Claim
71 words
A METHOD FOR PREPARING FINELY-DIVIDED, UREA-URETHANE PARTICLES COMPRISING COMBINING UNDER AGITATION AND IN AN INERT LIQUID, AROMATIC HYDROCARBON-CONTAINING REACTION MEDIUM, DIAMINE AND ISOCYANATE-TERMINATED URETHANE PREPOLYMER OF HYDROXY-TERMINATED POLYESTER POLYOL AND ESSENTIALLY HYDROCARBON DIISOCYANATE TO PROVIDE UREA-URETHANE POLYMER, SAID LIQUID REACTION MEDIUM CONTAINING SUFFICIENT AROMATIC HYDROCARBON SOLVENT WHICH SWELLS UREA-URETHANE POLYMER, TO DISSOLVE THE ISOCYANATE-TERMINATED URETHANE PREPOLYMER; AND CONTACTING THE UREA-URETHANE POLYMER WITH ALIPHATIC OR ALICYCLIC HYDROCARBON LIQUID TO OBTAIN UREA-URETHANE PARTICLES.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the free isocyanate content of the urethane prepolymer is about 2 to 10 weight percent of polymer solids.
Claim 4
Dependent Claim
22 words
The method of claim 1 wherein the diamine is employed in an approximately stoichiometric amount for combination with the isocyanate-terminated, urethane prepolymer.
Claim 5
Dependent Claim
21 words
The method of claim 3 wherein the free isocyanate content of the urea-urethane polymer is less than about 0.5 weight percent.
Claim 6
Dependent Claim
27 words
The method of claim 1 wherein the liquid reaction medium is provided in an amount of about 0.5 to 10 times the weight of the urethane prepolymer.
Claim 7
Dependent Claim
20 words
The method of claim 5 wherein the liquid reaction medium contains at least about 10 weight percent aromatic hydrocarbon solvent.
Claim 8
Dependent Claim
30 words
The method of claim 1 wherein aliphatic or alicyclic hydrocarbon liquid is present, with either the diamine or isocyanate-terminated, urethane prepolymer, prior to combination of diamine and isocyanate-terminated, urethane prepolymer.
Claim 9
Dependent Claim
20 words
The method of claim 7 wherein the liquid reaction medium contains at least about 10 weight percent aromatic hydrocarbon solvent.
Claim 10
Dependent Claim
27 words
The method of claim 1 wherein aliphatic or alicyclic hydrocarbon liquid is contacted with the urea-urethane polymer subsequent to the combination of diamine and isocyanate-terminated, urethane prepolymer.
Claim 11
Dependent Claim
32 words
The method of claim 1 wherein the hydroxy-terminated, polyester polyol is of dicarboxylic acid or anhydride having 4 to about 12 carbon atoms and polyol having up to about 12 carbon atoms.
Claim 12
Dependent Claim
12 words
The method of claim 10 wherein the dicarboxylic acid is orthophthalic acid.
Claim 13
Dependent Claim
18 words
The method of claim 1 wherein the hydroxy-terminated, polyester polyol is of a hydroxy carboxylic acid or lactone.
Claim 14
Dependent Claim
18 words
The method of claim 1 wherein the aromatic hydrocarbon solvent has from about 5 to 15 carbon atoms.
Claim 15
Dependent Claim
17 words
The method of claim 1 wherein the aliphatic or alicyclic hydrocarbon liquid is a mineral oil distillate.
Claim 16
Dependent Claim
24 words
The method of claim 1 wherein the weight ratio of aliphatic or alicyclic hydrocarbon liquid to aromatic hydrocarbon solvent is about 0.1:1 to 10:1.
Claim 17
Dependent Claim
18 words
The method of claim 1 wherein the urea-urethane particles have particle diameters of about 0.001 to 0.1 inch.
Claim 18
Dependent Claim
23 words
The method of claim 1 wherein the liquid reaction medium contains 0.02 to 2 weight percent surface-active agent based on the reaction medium.
Claim 19
Dependent Claim
11 words
The method of claim 17 wherein the surface-active agent is nonionic.
Claim 20
Dependent Claim
15 words
The method of claim 1 wherein micron-size silica particles are contacted with the urea-urethane polymer.
Claim 21
Dependent Claim
21 words
The method of claim 1 wherein the diamine is an essentially hydrocarbon primary diamine of 1 to about 40 carbon atoms.
Claim 22
Dependent Claim
17 words
The method of claim 1 wherein the essentially hydrocarbon diisocyanate has about 6 to 40 carbon atoms.
Claim 23
Independent Claim
168 words
A method for preparing finely-divided, urea-urethane particles comprising combining under agitation and in an inert liquid, aromatic hydrocarbon-containing reaction medium, essentially hydrocarbon primary diamine of 1 to about 40 carbon atoms and isocyanate-terminated urethane prepolymer having a free isocyanate content of about 2 to 10 weight percent polymer solids, said prepolymer being of hydroxy-terminated, polyester polyol having a molecular weight of about 400 to 4,000, and an essentially hydrocarbon diisocyanate of about 6 to 40 carbon atoms, to provide urea-urethane prepolymer, said liquid reaction medium comprising at least 10 weight percent aromatic hydrocarbon solvent which swells the urea-urethane polymer, to dissolve the urethane prepolymer; and contacting the urea-urethane polymer with aliphatic or alicyclic hydrocarbon liquid which boils primarily in the range of from about 80* to 400*C. to directly produce from the reactive medium, urea-urethane particles having particle diameters of about 0.001 to 0.1 inch, wherein the weight ratio of aliphatic or alicyclic hydrocarbon liquid to aromatic hydrocarbon solvent is in the range of about 0.1:1 to 10:1.
Claim 24
Independent Claim
168 words
A method for preparing finely-divided, urea-urethane particles comprising combining under agitation and in an inert liquid, aromatic hydrocarbon-containing reaction medium, essentially hydrocarbon primary diamine of 1 to about 40 carbon atoms and isocyanate-terminated urethane prepolymer having a free isocyanate content of about 2 to 10 weight percent polymer solids, said prepolymer being of hydroxy-terminated, polyester polyol having a molecular weight of about 400 to 4,000, and an essentially hydrocarbon diisocyanate of about 6 to 40 carbon atoms, to provide urea-urethane prepolymer, said liquid reaction medium comprising at least 10 weight percent aromatic hydrocarbon solvent which swells the urea-urethane polymer, to dissolve the urethane prepolymer; and contacting the urea-urethane polymer with aliphatic or alicyclic hydrocarbon liquid which boils primarily in the range of from about 80* to 400*C. to directly produce from the reactive medium, urea-urethane particles having particle diameters of about 0.001 to 0.1 inch, wherein the weight ratio of aliphatic or alicyclic hydrocarbon liquid to aromatic hydrocarbon solvent is in the range of about 0.1:1 to 10:1.
Claim 25
Dependent Claim
27 words
The method of claim 22 wherein the liquid reaction medium is provided in an amount of about 0.5 to 10 times the weight of the urethane prepolymer.
Claim 26
Dependent Claim
27 words
The method of claim 22 wherein aliphatic or alicyclic hydrocarbon liquid is present in the liquid reaction medium prior to combination of diamine and isocyanate-terminated, urethane prepolymer.
Claim 27
Dependent Claim
27 words
The method of claim 22 wherein aliphatic or alicyclic hydrocarbon liquid is contacted with the urea-urethane polymer subsequent to the combination of diamine and isocyanate-terminated, urethane prepolymer.
Claim 28
Dependent Claim
32 words
The method of claim 22 wherein the hydroxy-terminated, polyester polyol is of dicarboxylic acid or anhydride having 4 to about 12 carbon atoms and polyol having up to about 12 carbon atoms.
Claim 29
Dependent Claim
12 words
The method of claim 26 wherein the dicarboxylic acid if orthophthalic acid.
Claim 30
Dependent Claim
18 words
The method of claim 22 wherein the hydroxy-terminated, polyester polyol is of a hydroxy carboxylic acid or lactone.
Claim 31
Dependent Claim
17 words
The method of claim 22 wherein the aliphatic or alicyclic hydrocarbon liquid is a mineral oil distillate.
Claim 32
Dependent Claim
23 words
The method of claim 22 wherein the liquid reaction medium contains 0.02 to 2 weight percent surface-active agent based on the reaction medium.
Claim 33
Dependent Claim
11 words
The method of claim 30 wherein the surface-active agent is non-ionic.
Claim 34
Dependent Claim
15 words
The method of claim 22 wherein micron-size silica particles are contacted with the urea-urethane polymer.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |