US4528319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sag control of high solid polyurethane clearcoats by urea thixotrope/silica systems
Assignee: Motors Liquidation Co
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Filing: 1984-07-20
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Granted: 1985-07-09
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Expires: 2004-07-20
Abstract
Abstract Novel, high solids urethane clearcoat compositions having improved flow characteristics by the incorporation of a flow control system composed of urea thixotrope/silica additives. The urea thixotrope constituent is prepared by reacting a polyether polyol with a stoichiometric excess of a saturated cyclic aliphatic polyisocyanate to produce isocyanate-terminated prepolymers. These prepolymers are then modified by reaction with an ethanolamine to form urea endcapped thixotropes which are compatible in structure with any urethane clearcoat system. A combination of one of these urea thixotropes and a finely divided transparent silica is used effectively to reduce sagging of high solids urethane clearcoat systems. In fact, the combination of the two components produces a synergistic effect which is greater than that expected from any one of the components in the flow control system.
Inventors
- 👤 Robert A. Ottaviani
- 👤 William T. Short
- 👤 Donald J. Hart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:40
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36; C08L; C08L61/00; C08L61/20; C08L61/26; C08L61/28; C08L75/00; C08L75/04; C08L75/12; C09; C09D; C09D175/00; C09D175/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
85 words
A sprayable high solids urethane clearcoat composition comprising a urethane binder resin, a partially methylolated melamine cross-linking agent, and a flow control system consisting of a urethane-urea polymer and silica particles, said flow control system being added in an amount between 7 to 15 weight percent of said composition to improve the flow properties of the urethane clearcoat, said urethane-urea polymer constituent being a reaction product of an isocyanate-terminated polyether urethane prepolymer and an ethanolamine selected from the group consisting of monoethanolamine, diethanolamine, and triethanolamine.
Claim 2
Dependent Claim
85 words
A sprayable high solids urethane clearcoat composition comprising a urethane binder resin, a partially methylolated melamine cross-linking agent, and a flow control system consisting of a urethane-urea polymer and silica particles, said flow control system being added in an amount between 7 to 15 weight percent of said composition to improve the flow properties of the urethane clearcoat, said urethane-urea polymer constituent being a reaction product of an isocyanate-terminated polyether urethane prepolymer and an ethanolamine selected from the group consisting of monoethanolamine, diethanolamine, and triethanolamine.
Claim 3
Dependent Claim
131 words
A sprayable polyurethane clearcoat composition containing at least about 50 weight percent nonvolatile constituents comprising a urethane binder resin being a reaction product of an aliphatic poly-isocyanate and a stoichiometric excess with respect to the polyisocyanate of polyether polyols, a partially methylolated melamine cross-linking agent and an amount between 7 to 15 weight percent of said composition of a flow control system consisting of a combination of a urethane-urea polymer and fine particle size silica, said flow control system reducing sagging of the urethane clearcoat when applied to vertically oriented substrates, said urethane-urea polymer being a reaction product of an isocyanate-terminated prepolymer prepared by the reaction of one or more polyether polyols with an excess of a diisocyanate and an ethanolamine selected from the group consisting of monoethanolamine, diethanolamine, and triethanolamine.
Claim 4
Dependent Claim
131 words
A sprayable polyurethane clearcoat composition containing at least about 50 weight percent nonvolatile constituents comprising a urethane binder resin being a reaction product of an aliphatic poly-isocyanate and a stoichiometric excess with respect to the polyisocyanate of polyether polyols, a partially methylolated melamine cross-linking agent and an amount between 7 to 15 weight percent of said composition of a flow control system consisting of a combination of a urethane-urea polymer and fine particle size silica, said flow control system reducing sagging of the urethane clearcoat when applied to vertically oriented substrates, said urethane-urea polymer being a reaction product of an isocyanate-terminated prepolymer prepared by the reaction of one or more polyether polyols with an excess of a diisocyanate and an ethanolamine selected from the group consisting of monoethanolamine, diethanolamine, and triethanolamine.
Claim 5
Dependent Claim
166 words
A sprayable polyurethane clearcoat composition containing at least about 50 weight percent nonvolatile constituents which composition produces a durable surface finish when applied to and cured over a suitable substrate, said composition comprising a urethane binder resin being a reaction product of an aliphatic polyisocyanate and a stoichiometric excess with respect to the polyisocyanate of polyether polyols, a partially methylolated melamine cross-linking agent and a flow control system consisting of a combination of a urethane-urea polymer and fine particle size silica in a ratio between 1:3 to 4:1, said flow control system when added in an amount between 7 to 15 weight percent of said clearcoat composition reducing sagging of said clearcoat when applied to vertically oriented substrates without adversely affecting the viscosity and gloss properties, said urethane-urea polymer being a reaction product of an isocyanate-terminated prepolymer prepared by the reaction of one or more polyether polyols with an excess of a diisocyanate and an ethanolamine selected from the group consisting of monoethanolamine, diethanolamine, and triethanolamine.
Claim 6
Dependent Claim
166 words
A sprayable polyurethane clearcoat composition containing at least about 50 weight percent nonvolatile constituents which composition produces a durable surface finish when applied to and cured over a suitable substrate, said composition comprising a urethane binder resin being a reaction product of an aliphatic polyisocyanate and a stoichiometric excess with respect to the polyisocyanate of polyether polyols, a partially methylolated melamine cross-linking agent and a flow control system consisting of a combination of a urethane-urea polymer and fine particle size silica in a ratio between 1:3 to 4:1, said flow control system when added in an amount between 7 to 15 weight percent of said clearcoat composition reducing sagging of said clearcoat when applied to vertically oriented substrates without adversely affecting the viscosity and gloss properties, said urethane-urea polymer being a reaction product of an isocyanate-terminated prepolymer prepared by the reaction of one or more polyether polyols with an excess of a diisocyanate and an ethanolamine selected from the group consisting of monoethanolamine, diethanolamine, and triethanolamine.
References Cited (Backward Citations)
US4387194A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |