US3624020A
Expired / Lapsed
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Modified aqueous dispersions
Assignee: Bayer AG
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Filing: 1967-09-27
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Granted: 1971-11-30
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Expires: 1987-09-27
Abstract
Abstract A process for preparing modified aqueous dispersions of polymers and copolymers by reacting an aqueous dispersion of the polymers or copolymers with the reaction product of a high molecular weight compound containing at least two active hydrogen atoms and an excess of an organic polyisocyanate.
Inventors
- 👤 Wolfgang Klebert
- 👤 Karl Schafer
- 👤 Wolfram Von Langenthal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:55
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/62; C08G18/6216; C08G18/6266; C08G18/08; C08G18/10; C08G18/61
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
25 words
The process of claim 1 wherein the copolymer is obtained by copolymerizing Mannich bases of acrylamide and methacrylamide with methylol compounds of acrylamide and methacrylamide.
Claim 2
Dependent Claim
39 words
The process of claim 1 wherein the prepolymer is prepared by reacting an organopolysiloxane having a molecular weight of up to about 25,000 and containing at least two groups which are reactive with NCO groups with an organic polyisocyanate.
Claim 3
Dependent Claim
46 words
The process of claim 1 wherein the prepolymer is prepared by reacting an organic polyisocyanate with a high molecular weight compound containing at least two groups which are reactive with NCO groups and a low molecular weight polyalcohol having a molecular weight from 50.0 to 10,000.
Claim 4
Dependent Claim
44 words
The process of claim 1 wherein an aqueous emulsion of the prepolymer is prepared, the resulting emulsion is stirred into the aqueous dispersion of the copolymers and the mixture is left to stand until the free NCO content thereof has dropped to substantially zero.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein the ratio of the prepolymer to the copolymer is from about 0.1:1 to about 2:1.
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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |