US4024307A
Expired / Lapsed
US
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Polyurethane solutions
Assignee: Akzo NV
•
Filing: 1975-02-24
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Granted: 1977-05-17
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Expires: 1995-02-24
Abstract
Abstract A process for the production of polyurethane solutions by reaction of a diisocyanate with a mixture of a glycol and a polymer bearing terminal hydroxy groups in a solvent medium under certain prescribed conditions. The resulting polyurethane solutions are especially valuable as impregnants or coating agents for textile substrates, for example in the preparation of a microporous synthetic leather.
Inventors
- 👤 Helmut Brahm
- 👤 Helmut Schulze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:23
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6603; C08G18/6607; C08G18/08; C08G18/10; C08G18/12; C08K; C08K3/00; C08K3/16; C08K3/32; C08K5/00; C08K5/04; C08K5/09; C08K5/16; C08K5/17; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31591; Y10T442/00; Y10T442/20; Y10T442/2139; Y10T442/2148
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
146 words
In a process for the production of polyurethane solutions by reaction of hydroxy compounds with diisocyanates in a solvent consisting essentially of dimethylformamide, the improvement which comprises: concurrently reacting (a) one mol of a polyester or polyether having hydroxy end groups and a molecular weight of about 800 to 4000 and (b) 1.2 to 9 mols of an aliphatic glycol of 2 to 9 carbon atoms in said dimethylformamide together with (c) a diisocyanate at a temperature of about 80° C. to 110° C., the reaction being carried out at a concentration in the solvent of about 25 to 45% by weight of the initial reactants; maintaining a molar ratio of NCO-groups to OH-groups of about 1 ± 0.08 during the reaction; and stopping the reaction after reaching a viscosity of about 200 to 3500 poise, measured at 20° C., by addition of a monovalent alcohol.
Claim 2
Dependent Claim
146 words
In a process for the production of polyurethane solutions by reaction of hydroxy compounds with diisocyanates in a solvent consisting essentially of dimethylformamide, the improvement which comprises: concurrently reacting (a) one mol of a polyester or polyether having hydroxy end groups and a molecular weight of about 800 to 4000 and (b) 1.2 to 9 mols of an aliphatic glycol of 2 to 9 carbon atoms in said dimethylformamide together with (c) a diisocyanate at a temperature of about 80° C. to 110° C., the reaction being carried out at a concentration in the solvent of about 25 to 45% by weight of the initial reactants; maintaining a molar ratio of NCO-groups to OH-groups of about 1 ± 0.08 during the reaction; and stopping the reaction after reaching a viscosity of about 200 to 3500 poise, measured at 20° C., by addition of a monovalent alcohol.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein a stabilizer is added to the solution after stopping the reaction.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein polyethylene adipate is used as the polyester.
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein polytetramethylene glycol is used as the polyether.
Claim 6
Dependent Claim
24 words
The process of claim 1 wherein a mixed polyester of adipic acid esterified with ethylene glycol and butylene glycol is used as the polyester.
Claim 7
Dependent Claim
17 words
The process of claim 1 wherein component (a) is a mixture of a polyester and a polyether.
Claim 8
Dependent Claim
17 words
The process of claim 6 wherein component (a) is a mixture of polyethylene adipate and polytetramethylene glycol.
Claim 9
Dependent Claim
27 words
The process of claim 1 wherein the simultaneously used components (a) and (b) taken together as a mixture have a hydroxyl number of about 180 to 200.
Claim 10
Dependent Claim
27 words
The process of claim 1 wherein the simultaneously used components (a) and (b) taken together as a mixture have a hydroxyl number of about 200 to 250.
Claim 11
Dependent Claim
39 words
The process of claim 1 wherein the polyester or polyether of component (a) exhibits a reaction velocity constant K 2 =1.0 to 10 × 10 - 3 l./mol×sec. in a reaction with 4,4'-diphenylmethane-diisocyanate in dimethyl formamide at 25° C.
Claim 12
Dependent Claim
18 words
The process of claim 10 wherein said constant K 2 =2 to 4 × 10 - 3 l./mol×sec.
Claim 13
Dependent Claim
20 words
The process of claim 1 wherein the reaction is carried out at a temperature of about 90° to 95° C.
Claim 14
Dependent Claim
31 words
The process of claim 1 wherein the concentration of initial reactants or the corresponding reaction products in the solvent during the reaction is maintained between about 30 and 40% by weight.
Claim 15
Dependent Claim
36 words
The process of claim 1 wherein the molar ratio of NCO-groups to OH-groups during the reaction is maintained constant in the range of 0.93 to 0.98 with a variation of not more than about ± 0.02.
Claim 16
Dependent Claim
36 words
The process of claim 1 wherein the molar ratio of NCO-groups to OH-groups during the reaction is maintained constant in the range of 0.93 to 0.98 with a variation of not more than about ± 0.01.
Claim 17
Dependent Claim
58 words
The process of claim 14 wherein the reaction is first carried out up to about 90% conversion of the functional reactive groups at a molar ratio of NCO-groups to OH-groups of between about 0.93 and 0.96 and thereafter the reaction is completed with the addition of the diisocyanate to increase said molar ratio to about 0.98 ± 0.015.
Claim 18
Dependent Claim
39 words
The process of claim 10 wherein the initially selected polyester or polyether of component (a) is deactivated and is used in combination with an activator to provide said constant K 2 = 1.0 to 10 × 10 3 l./mol×sec.
Claim 19
Dependent Claim
41 words
The process of claim 11 wherein the initially selected polyester or polyether of component (a) is deactivated and is used in combination with an activator to provide said constant K 2 = 2 to 4 × 10 - 3 l./mol× sec.
Claim 20
Dependent Claim
19 words
The process of claim 1 wherein the polyester or polyether being used is essentially free of a heavy metal.
Claim 21
Dependent Claim
18 words
The process of claim 1 wherein ethanol is added as the monovalent alcohol used to stop the reaction.
Claim 22
Dependent Claim
15 words
The process of claim 20 wherein a solution of ethanol in dimethyl formamide is used.
Claim 23
Dependent Claim
11 words
The process of claim 2 wherein the stabilizer is salicylic acid.
Claim 24
Dependent Claim
16 words
The process of claim 22 wherein a solution of salicylic acid in dimethyl formamide is used.
Claim 25
Dependent Claim
10 words
The polyurethane solution obtained by the process of claim 1.
Claim 26
Dependent Claim
19 words
The process of claim 1 wherein the resulting polyurethane solution is used to impregnate or coat a textile substrate.
Claim 27
Dependent Claim
27 words
The process of claim 8 wherein the resulting polyurethane solution is used to impregnate or coat a textile substrate in the production of a microporous synthetic leather.
Claim 28
Dependent Claim
27 words
The process of claim 9 wherein the resulting polyurethane solution is used to impregnate or coat a textile substrate in the production of a microporous synthetic leather.
Claim 29
Dependent Claim
13 words
A coated textile substrate obtained by the process as claimed in claim 25.
Claim 30
Dependent Claim
13 words
A synthetic leather product obtained by the process as claimed in claim 26.
Claim 31
Dependent Claim
13 words
A synthetic leather product obtained by the process as claimed in claim 27.
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) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |