Patent US4816542A successfully refreshed from Google Patents.
US4816542A
Expired / Lapsed
US
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Process for the preparation of coatings from polyurethane single component systems and steam
Assignee: BASF Polyurethanes GmbH
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Filing: 1988-05-13
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Granted: 1989-03-28
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Expires: 2008-05-13
Abstract
Abstract The present invention relates to a process for the preparation of coatings by reacting polyurethane single component systems, which preferably contain at least one prepolymer containing NCO groups in bonded form and a latent hardener, whereby the polyurethane single component system is mixed with steam at a temperature from 100° C. to 500° C., and fed under a pressure of 0.5 to 10 bars, and finally sprayed using a general spray method. The coatings so formed cure bubble free independent of the moisture content of the surroundings and without exhibiting coating mass runoff.
Inventors
- 👤 Herbert Liebl
- 👤 Peter Roche
- 👤 Matthaeus Rank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:09
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/02; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0895; C08G18/10; C09; C09D; C09D175/00; C09D175/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
39 words
A process for preparing coatings comprising spraying, under pressure and with steam, a single component polyurethane system comprising a prepolymer having an NCO content in bonded form of from about 1 to 20 weight percent, and a latent hardener.
Claim 2
Dependent Claim
39 words
A process for preparing coatings comprising spraying, under pressure and with steam, a single component polyurethane system comprising a prepolymer having an NCO content in bonded form of from about 1 to 20 weight percent, and a latent hardener.
Claim 3
Dependent Claim
20 words
The process according to claim 1, wherein the steam is fed under a pressure of about 0.5 to 10 bars.
Claim 4
Dependent Claim
18 words
The process according to claim 1, wherein the steam has a temperature from about 100° to 500° C.
Claim 5
Dependent Claim
30 words
The process according to claim 1, wherein the steam has a temperature from 100° to 250° C. and it is fed under a pressure of about 2.0 to 5.0 bars.
Claim 6
Dependent Claim
25 words
The process according to claim 1, wherein from about 0.01 to 1.0 kg of steam is required per kg of the polyurethane single component system.
Claim 7
Dependent Claim
94 words
The process according to claim 1, wherein the polyurethane single component systems comprise prepolymers containing NCO groups in bonded form having an NCO content from 1 to 10 weight percent and which are prepared by reactions of (a) organic polyisocyanates selected from the group consisting of aliphatic, cycloaliphatic, aromatic polyisocyanates and mixtures thereof with (b) higher molecular polyols, selected from the group consisting of difunctional polyester or polyether polyols having a molecular weight of from about 500 to 8000, trifunctional polyester polyether polyols having molecular weights from about 500 to 8,000, and mixtures thereof.
Claim 8
Dependent Claim
55 words
The process according to claim 1, wherein the polyurethane single component systems comprise: a polyurethane prepolymer having an NCO content from about 1 to 10 weight percent, prepared by the reaction of organic polyisocyanates and higher molecular polyols, and a latent hardener selected from the group consisting of an aldemine, a ketimine and mixtures thereof.
Claim 9
Dependent Claim
62 words
The process according to claim 1, wherein the polyurethane single component systems comprise: a polyurethane prepolymer having an NCO content from about 1 to 10 weight percent and a ketimine and/or aldimine as a latent hardener in such a quantity so that from about 0.2 to 1.3 equivalents of --N═C< and/or --N═CH-- groups are present per NCO group of the urethane prepolymer.
References Cited (Backward Citations)
US4720535A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |