US4824926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bilayer windshield with an abrasion and solvent resistant polyurethane protective coating
Assignee: PPG Industries Ohio Inc
•
Filing: 1987-12-16
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Granted: 1989-04-25
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Expires: 2007-12-16
Abstract
Abstract An abrasion and solvent resistant polyurethane protective coating for bilayer windshields is formulated by the reaction of a polyester or polyether diol with an aliphatic isocyanate-terminated prepolymer.
Inventors
- 👤 James B. O'Dwyer
- 👤 Wen-Hsuan Chang
- 👤 Roger L. Scriven
- 👤 Joseph Cherenko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:35
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10009; B32B17/10018; B32B17/10165; B32B17/1033; B32B17/1055; B32B17/1077; C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/75; C08G18/77; C08G18/78; C08G18/79; C08G18/791; C08G18/792; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8009; C08G18/8022; C08G18/8025
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
41 words
An abrasion-resistant polyurethane coating composition comprising: a. a branched prepolymer having an isocyanate functionality greater that 2; and b. a hydroxy-terminated linear polymeric polyol selected from the group consisting of polyethers and polyesters having a molecular weight between 300 and 5,000.
Claim 2
Dependent Claim
41 words
An abrasion-resistant polyurethane coating composition comprising: a. a branched prepolymer having an isocyanate functionality greater that 2; and b. a hydroxy-terminated linear polymeric polyol selected from the group consisting of polyethers and polyesters having a molecular weight between 300 and 5,000.
Claim 3
Dependent Claim
16 words
An abrasion-resistant polyurethane coating composition according to claim 1, wherein said hydroxy-terminated polyol is a diol.
Claim 4
Dependent Claim
16 words
An abrasion-resistant polyurethane coating composition according to claim 2, wherein said diol is a polyether diol.
Claim 5
Dependent Claim
17 words
An abrasion-resistant polyurethane coating composition according to claim 3, wherein said polyether diol is polytetramethylene ether glycol.
Claim 6
Dependent Claim
16 words
An abrasion-resistant polyurethane coating composition according to claim 2, wherein said diol is a poyester diol.
Claim 7
Dependent Claim
17 words
An abrasion-resistant polyurethane coating composition according to claim 5, wherein said polyester diol is a polycaprolactone diol.
Claim 8
Dependent Claim
25 words
An abrasion-resistant polyurethane coating composition according to claim 1, wherein said branched prepolymer is an isocyanate-terminated prepolymer reaction product of a diisocyanate and a triol.
Claim 9
Dependent Claim
32 words
An abrasion-resistant polyurethane coating composition according to claim 7, wherein said isocyanate-terminated prepolymer is the reaction product of a diisocyanate selected from the group consisting of isophorone diisocyanate and methylene bis(cyclohexyl isocyanate).
Claim 10
Dependent Claim
23 words
An abrasion-resistant polyurethane coating composition according to claim 8, wherein said isocyanate-terminated prepolymer is the reaction product of a diisocyanate with trimethylol propane.
Claim 11
Dependent Claim
18 words
An abrasion-resistant polyurethane coating composition according to claim 1, further comprising ultraviolet light absorbing compound and antioxidant compound.
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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) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |