US4582891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for inhibiting corrosion of polyurethane coating
Assignee: DKS Co Ltd
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Filing: 1985-02-06
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Granted: 1986-04-15
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Expires: 2005-02-06
Abstract
Abstract An anti-corrosive polyurethane coating composition which has excellent metal corrosion inhibiting property, water resistance, adhesion property to metals, impact resistance and other properties required for anti-corrosive paints, and can be coated thick with one coating operation, containing as an essential component a polyurethane resin having a density of crosslinking of 1.10 to 2.00 per 1,000 atomic weight of the resin and produced by reaction of (A) a polyol component having a hydroxyl value of 160 to 350 mgKOH/g and being composed of a castor oil polyol alone or a mixture of a castor oil polyol and a low molecular polyol having a functionality of at least 2, preferably at least 3, and (B) a polyisocyanate component in an NCO/active hydrogen ratio of 0.85-1.151 by equivalent.
Inventors
- 👤 Hirohisa Maki
- 👤 Takaya Kawamura
- 👤 Hidehiro Uchikata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:09
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/36; C08G18/08; C08G18/088; C08G18/0885; C08G2150/00; C08G2150/90; Y; Y10; Y10S; Y10S528/00; Y10S528/905
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
A process for inhibiting corrosion of metals which comprises applying an anti-corrosion polyurethane coating composition to a metal substrate, said composition comprising a polyurethane resin produced by reaction of (A), as a polyol component, a castor oil polyol having a hydroxyl value of 160 to 350 mg KOH/g or a polyol mixture of a castor oil polyol and a low molecular polyol having a functionality of at least 2, the average hydroxyl value of said polyol mixture being from 160 to 350 mg KOH/g, and (B) an organic polyisocyanate compound as a polyisocyanate component in an NCO/active hydrogen ratio of 0.85-1.15/1 by equivalent, said polyurethane resin having a density of crosslinking of 1.10 to 2.00 per 1,000 atomic weight.
Claim 2
Dependent Claim
119 words
A process for inhibiting corrosion of metals which comprises applying an anti-corrosion polyurethane coating composition to a metal substrate, said composition comprising a polyurethane resin produced by reaction of (A), as a polyol component, a castor oil polyol having a hydroxyl value of 160 to 350 mg KOH/g or a polyol mixture of a castor oil polyol and a low molecular polyol having a functionality of at least 2, the average hydroxyl value of said polyol mixture being from 160 to 350 mg KOH/g, and (B) an organic polyisocyanate compound as a polyisocyanate component in an NCO/active hydrogen ratio of 0.85-1.15/1 by equivalent, said polyurethane resin having a density of crosslinking of 1.10 to 2.00 per 1,000 atomic weight.
Claim 3
Dependent Claim
64 words
The process of claim 1, wherein said castor oil polyol is a member selected from the group consisting of: castor oil; an interesterification product of castor oil and an ethylene, propylene, butylene or styrene oxide adduct of dipropylene glycol, glycerol or trimethylolpropane; and an esterification product of ricinoleic acid and an ethylene, propylene, butylene or styrene oxide adduct of dipropylene glycol, glycerol or trimethylolpropane.
Claim 4
Dependent Claim
20 words
The process of claim 1, wherein said low molecular polyol has a hydroxyl value of 30 to 1,300 mg KOH/g.
Claim 5
Dependent Claim
17 words
The process of claim 1, wherein said low molecular polyol has a functionality of at least 3.
Claim 6
Dependent Claim
49 words
The process of claim 1, wherein said low molecular polyol is a member selected from the group consisting of glycerol; trimethylolpropane; pentaerythritol; sorbitol; an ethylene, propylene or butylene oxide adduct of glycerol, trimethylolpropane, pentaerythritol or sorbitol; and an ethylene, propylene or butylene oxide adduct of ethanolamine, diethanolamine or ethylenediamine.
Claim 7
Dependent Claim
34 words
The process of claim 1, wherein said metal substrate is a pipe, tube, rod, or plate which is made of a metal selected from the group consisting of steel, aluminum, tin and cast iron.
Claim 8
Dependent Claim
28 words
The process of claim 1, wherein said metal substrate is a crude oil reserve tank, a petroleum tank, a steel structure of a plant, or a sea structure.
References Cited (Backward Citations)
US3546148A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |