US3874904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of polyurethane coating using a one-component polyurethane
Assignee: Progil-Bayer-Ugine
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Filing: 1972-10-06
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Granted: 1975-04-01
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Expires: 1992-10-06
Abstract
Abstract Relates to coatings of polyurethane having free isocyanate groups to which have been added pulverulent fillers having a grain size of between 0.05 - 3 mm diameter which can be as thick as 12-15 mm and still free from all surface defects.
Inventors
- 👤 Leon Orsini
- 👤 Roger Laurent
- 👤 Denis Dessevre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:52
CPC Classifications
E; E01; E01C; E01C7/00; E01C7/08; E01C7/35; E01C7/356; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08K; C08K3/00; C08K3/01; C08K3/013; C08L; C08L75/00; C08L75/04; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/31504; Y10T428/31551; Y10T428/31554
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
113 words
A METHOD OF COATING A SURFACE WITH A POLYURETHANE COATING WHICH COMPRISES APPLYING ONTO SAID SURFACE A PRIME COAT OF A SOLUTION OF POLYURETHANE IN A VOLATILE ORGANIC SOLVENT, SAID SOLUTION CONTAINING 30-80 PERCENT OF DRY EXTRACT, SAID SOLUTION BEING APPLIED AT THE RATE OF 50-400G/M2, AFTER A PERIOD OF AT LEAST 15 MINUTES APPLYING THEREON A TOP COATING OF 3-15 MM THICKNESS OF A NON-COMPONENT POLYURETHANE HAVING FREE ISOCYANATE GROUPS AND HAVING A RATIO OF NCO/OH IN THE RANGE OF 2.5-10 AND INCLUDING 2-40 PARTS BY WEIGHT OF DRY POLYURETHANE OF PULVERULENT FILLER HAVING A GRAIN SIZE OF 0.05-3MM DIAMETER, THEREAFTER ALLOWING SAID ONE-COMPONENT POLYURETHANE TO CURE IN THE PRESENCE OF MOISTURE.
Claim 2
Independent Claim
113 words
A METHOD OF COATING A SURFACE WITH A POLYURETHANE COATING WHICH COMPRISES APPLYING ONTO SAID SURFACE A PRIME COAT OF A SOLUTION OF POLYURETHANE IN A VOLATILE ORGANIC SOLVENT, SAID SOLUTION CONTAINING 30-80 PERCENT OF DRY EXTRACT, SAID SOLUTION BEING APPLIED AT THE RATE OF 50-400G/M2, AFTER A PERIOD OF AT LEAST 15 MINUTES APPLYING THEREON A TOP COATING OF 3-15 MM THICKNESS OF A NON-COMPONENT POLYURETHANE HAVING FREE ISOCYANATE GROUPS AND HAVING A RATIO OF NCO/OH IN THE RANGE OF 2.5-10 AND INCLUDING 2-40 PARTS BY WEIGHT OF DRY POLYURETHANE OF PULVERULENT FILLER HAVING A GRAIN SIZE OF 0.05-3MM DIAMETER, THEREAFTER ALLOWING SAID ONE-COMPONENT POLYURETHANE TO CURE IN THE PRESENCE OF MOISTURE.
Claim 3
Independent Claim
105 words
A method of coating a large surface with a one component polyurethane system, comprising: applying onto said surface in a thickness of 3-15 mm a composition consisting essentially of a one component polyurethane having free isocyanate groups which harden under the influence of moisture prepared from a linear polyether or polyester containing hydroxyl groups and an organic polyisocyanate, said system having a ratio NCO/OH in the range of 2.5 - 10, the remaining OH groups necessary to effect polyurethane curing being provided by moisture, and 2-40 parts by weight per part polyurethane of a filler having a large grain diameter between 0.05 and 3 mm.
Claim 4
Independent Claim
105 words
A method of coating a large surface with a one component polyurethane system, comprising: applying onto said surface in a thickness of 3-15 mm a composition consisting essentially of a one component polyurethane having free isocyanate groups which harden under the influence of moisture prepared from a linear polyether or polyester containing hydroxyl groups and an organic polyisocyanate, said system having a ratio NCO/OH in the range of 2.5 - 10, the remaining OH groups necessary to effect polyurethane curing being provided by moisture, and 2-40 parts by weight per part polyurethane of a filler having a large grain diameter between 0.05 and 3 mm.
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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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |