US4507336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for protecting a substrate with a multi-density composite polyurethane
Assignee: Individual
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Filing: 1982-02-01
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Granted: 1985-03-26
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Expires: 2002-02-01
Abstract
Abstract A substrate, such as a roofing substrate, is protected by coating it with a low density polyurethane foam which is then coated with an essentially non-porous, dense, elastomeric polyurethane layer. The layer is formed by spraying a volatile-free spray of polyurethane precursor reactants onto the surface of the foam and rapidly reacting the precursors.
Inventors
- 👤 Louis F. Cenegy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:14
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/50; B05D7/52; B05D7/54; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6681; C08G18/6688; E; E04; E04D; E04D7/00; B05D2503/00; C08G2150/00; C08G2150/50
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
131 words
A method for protecting a substrate comprising the steps of: applying a layer of low density polyurethane foam to the substrate, providing a volatile-free A component containing an isocyanate urethane precursor, providing a volatile-free B component containing a polyol urethane precursor, mixing a spray of catalyst means and said A component and said B component to provide a volatile-free spray of polyurethane precursors, spraying said substantially volatile-free spray onto the surface of said low density foam while maintaining said foam at a temperature within the range from about 40° F. to about 120° F., and reacting said polyurethane precursors in a reaction time up to about ten seconds to form an essentially non-porous elastomeric polyurethane coating above about 20 mils in thickness and having a hardness above about 20 Shore A.
Claim 2
Independent Claim
131 words
A method for protecting a substrate comprising the steps of: applying a layer of low density polyurethane foam to the substrate, providing a volatile-free A component containing an isocyanate urethane precursor, providing a volatile-free B component containing a polyol urethane precursor, mixing a spray of catalyst means and said A component and said B component to provide a volatile-free spray of polyurethane precursors, spraying said substantially volatile-free spray onto the surface of said low density foam while maintaining said foam at a temperature within the range from about 40° F. to about 120° F., and reacting said polyurethane precursors in a reaction time up to about ten seconds to form an essentially non-porous elastomeric polyurethane coating above about 20 mils in thickness and having a hardness above about 20 Shore A.
Claim 3
Dependent Claim
40 words
The method recited in claim 1 wherein said spray is sprayed onto said low density foam in an amount sufficient to provide an elastomeric polyurethane coating having a thickness in the range from about 40 mils to about 100 mils.
Claim 4
Dependent Claim
36 words
The method recited in claim 1 wherein the hardness of said elastomeric coating is much higher than that of the foam and is in the range from about 20 Shore A to about 80 Shore D.
Claim 5
Dependent Claim
27 words
The method recited in claim 3 wherein said spray is sprayed onto said foam at temperatures in the range from about 120° F. to about 140° F.
Claim 6
Dependent Claim
57 words
The method recited in claim 1 wherein said low density polyurethane foam is applied to said substrate by spraying polyurethane foam precursors onto said substrate and reacting said precursors thereon, and wherein said substantially volatile-free spray is applied to said foam from about one minute to about two hours after completion of the curing of said foam.
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) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |