US3857818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blocked polyurethane powder coating compositions
Assignee: PRATT & LAMBERT Inc A CORPOF NY
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Filing: 1972-09-18
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Granted: 1974-12-31
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Expires: 1992-09-18
Abstract
Abstract A powder coating composition comprising a mixture of ketoximeblocked isocyanate prepolymer and a hydroxy functional resin.
Inventors
- 👤 G Frizelle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:49
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8061; C08G18/807; C08G18/8077; C08G18/28; C08G18/40; C08G18/62; C08G18/6216; C08G18/622; C08G18/6225; C08G18/6229; C08G18/8003; C08G18/8006; C08G18/8038; C08G2150/00; C08G2150/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
120 words
A SOLID, HEAT-CURABLE POWDER COATING COMPOSITION CONSISTING ESSENTIALLY OF A SOLID POWDER MIXTURE OF A SOLID KETOXIME-BLOCKED ORGANIC POLYISOCYANATE HAVING NO FREE ISOYANATE GROUPS WHICH BECOMED UNBLOCKED AT THE CURING TEMPERATURE AND A SOLID HYDROXY FUNCTIONAL ACRYLIC OR POLYESTER RESIN, THE RATIO OF THE VLOCKED ISOCYANATE TO HYDROXY RESIN BEING SUCH AS TO GIVE AN NCO/OH RATIO OF 0.6/1.0 TO 1.5/1.0 AND SAID SOLID HYDROXY FUNCTIONAL RESIN BEING SELECTED FROM THE GROUP CONSISTING OF 8A) SOLID HYDROXY FUNCTIONAL ACRYLIC COPOLYMERS OF (1) AT LEAST ONE MONOMER SELECTED FROM THE GROUP CONSISTING OF STYRENE, A-METHYL STYRENE, ALKYL METHACRYLATES AND ALKYL ACRYLATED AND (2) A HYDROXY ALKYL ACRYLATE OF METHACRYLATE; AND 8B) SOLID HYDROXY FUNCTIONAL POLYESTERS OF POLYHYDRIC ALCOHOLS AND DIBASIC ACIDS.
Claim 2
Dependent Claim
120 words
A SOLID, HEAT-CURABLE POWDER COATING COMPOSITION CONSISTING ESSENTIALLY OF A SOLID POWDER MIXTURE OF A SOLID KETOXIME-BLOCKED ORGANIC POLYISOCYANATE HAVING NO FREE ISOYANATE GROUPS WHICH BECOMED UNBLOCKED AT THE CURING TEMPERATURE AND A SOLID HYDROXY FUNCTIONAL ACRYLIC OR POLYESTER RESIN, THE RATIO OF THE VLOCKED ISOCYANATE TO HYDROXY RESIN BEING SUCH AS TO GIVE AN NCO/OH RATIO OF 0.6/1.0 TO 1.5/1.0 AND SAID SOLID HYDROXY FUNCTIONAL RESIN BEING SELECTED FROM THE GROUP CONSISTING OF 8A) SOLID HYDROXY FUNCTIONAL ACRYLIC COPOLYMERS OF (1) AT LEAST ONE MONOMER SELECTED FROM THE GROUP CONSISTING OF STYRENE, A-METHYL STYRENE, ALKYL METHACRYLATES AND ALKYL ACRYLATED AND (2) A HYDROXY ALKYL ACRYLATE OF METHACRYLATE; AND 8B) SOLID HYDROXY FUNCTIONAL POLYESTERS OF POLYHYDRIC ALCOHOLS AND DIBASIC ACIDS.
Claim 3
Dependent Claim
20 words
The composition of claim 1 wherein the blocked polyisocyanate is the reaction product of methyl ethyl ketoxime and a diisocyanate.
Claim 4
Dependent Claim
15 words
The composition of claim 1 wherein the diisocyanate is toluene diisocyanate or 4,4''-methylene bis(cyclohexyl isocyanate).
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) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |