US4088622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molded drag reduction coatings
Assignee: United States Department of the Navy
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Filing: 1976-06-25
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Granted: 1978-05-09
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Expires: 1996-06-25
Abstract
Abstract Improved molded drag reduction coatings which inhibit the degradation of g reduction properties of high molecular weight polymers such as polyethylene oxide. The moldings incorporate compatible anti-oxidants and/or lubricants and plasticizers in amounts that do not significantly decrease the drag reduction effectiveness of the polymer used.
Inventors
- 👤 Harry A. Pearl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:42
CPC Classifications
F; F42; F42B; F42B19/00; F42B19/12; F42B19/125; C; C08; C08K; C08K5/00; C08K5/04; C08K5/07; C08K5/36; C08K5/37; C08K5/375; Y; Y02; Y02T; Y02T70/00; Y02T70/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
58 words
An improved molded drag reduction coating comprising: 100 parts by weight of polyethylene oxide polymer in powder form having a molecular weight of 4 × 10 6 molded together with 0.5 parts by weight of 4, 4' thio-bis (6-tert-butyl meta cresol) in 20 c.c. of acetone at a temperature of 300° F and a pressure of 415 psi.
Claim 2
Dependent Claim
58 words
An improved molded drag reduction coating comprising: 100 parts by weight of polyethylene oxide polymer in powder form having a molecular weight of 4 × 10 6 molded together with 0.5 parts by weight of 4, 4' thio-bis (6-tert-butyl meta cresol) in 20 c.c. of acetone at a temperature of 300° F and a pressure of 415 psi.
Claim 3
Dependent Claim
64 words
An improved molded drag reduction coating comprising: 87 percent by weight of a powder of a first polyethylene oxide polymer having a molecular weight of 4 × 10 6 molded together with 13 percent by weight of a second polyethylene oxide polymer of molecular weight 9 × 10 5 in a calendered film form of thickness 1.7 mils at 230° F and 500 psi.
Claim 4
Dependent Claim
64 words
An improved molded drag reduction coating comprising: 87 percent by weight of a powder of a first polyethylene oxide polymer having a molecular weight of 4 × 10 6 molded together with 13 percent by weight of a second polyethylene oxide polymer of molecular weight 9 × 10 5 in a calendered film form of thickness 1.7 mils at 230° F and 500 psi.
Claim 5
Dependent Claim
59 words
An improved molded drag reduction coating comprising: 91 weight percent of polyethylene oxide polymer powder having a molecular weight of 4 × 10 6 molded together with 9 weight percent of a 4.8 percent by weight solution of 4, 4' -thio-bis (6-tert-butyl meta cresol) in polyoxyalkylene sorbitan monolaurate of theoretical weight of 1226 at 180° F and 415 psi.
Claim 6
Dependent Claim
59 words
An improved molded drag reduction coating comprising: 91 weight percent of polyethylene oxide polymer powder having a molecular weight of 4 × 10 6 molded together with 9 weight percent of a 4.8 percent by weight solution of 4, 4' -thio-bis (6-tert-butyl meta cresol) in polyoxyalkylene sorbitan monolaurate of theoretical weight of 1226 at 180° F and 415 psi.
Claim 7
Dependent Claim
75 words
An improved molded drag reduction coating comprising: 91 percent by weight of polyethylene oxide polymer powder having a molecular of 4 × 10 6 molded together with 4.5 percent by weight of a 4.8 percent by weight solution of 4, 4' thio-bis (6-tert-butyl meta cresol) in polyoxyalkylene sorbitan monolaurate of theoretical weight 1226; and 4.5 percent by weight of anisole (methyl phenyl ether) at temperature and pressure conditions of 300° F and 451 psi respectively.
Claim 8
Dependent Claim
75 words
An improved molded drag reduction coating comprising: 91 percent by weight of polyethylene oxide polymer powder having a molecular of 4 × 10 6 molded together with 4.5 percent by weight of a 4.8 percent by weight solution of 4, 4' thio-bis (6-tert-butyl meta cresol) in polyoxyalkylene sorbitan monolaurate of theoretical weight 1226; and 4.5 percent by weight of anisole (methyl phenyl ether) at temperature and pressure conditions of 300° F and 451 psi respectively.
Claim 9
Dependent Claim
93 words
An improved molded drag reduction coating comprising: 80 weight percent of the first polyethylene oxide polymer powder having a molecular weight of 4 × 10 6 ; 4 percent of a 4.8 percent by weight solution of 4, 4' thio-bis (6-tert-butyl meta cresol) in polyoxyalkylene sorbitan monolaurate of theoretical weight 1226; 4 weight percent of anisole (methyl phenyl ether); and 12 weight percent of the second polyethylene oxide polymer of molecual weight 9 × 10 5 and calendered into a film at temperature and pressure conditions of 230° F and 500 psi respectively.
Claim 10
Dependent Claim
93 words
An improved molded drag reduction coating comprising: 80 weight percent of the first polyethylene oxide polymer powder having a molecular weight of 4 × 10 6 ; 4 percent of a 4.8 percent by weight solution of 4, 4' thio-bis (6-tert-butyl meta cresol) in polyoxyalkylene sorbitan monolaurate of theoretical weight 1226; 4 weight percent of anisole (methyl phenyl ether); and 12 weight percent of the second polyethylene oxide polymer of molecual weight 9 × 10 5 and calendered into a film at temperature and pressure conditions of 230° F and 500 psi respectively.
Claim 11
Independent Claim
129 words
A method of making an improved drag reduction coating including the steps of: mixing uniformly a powder of a first polyethylene oxide polymer of molecualr weight 4 × 10 6 with 4.8 percent of weight solution of 4, 4' thio-bis (6-tert-butyl meta cresol) in sorbitan monolaurate of theoretical molecular weight 1226 and anisole (methyl phenyl ether) in a fixed ratio by weight forming a mixture; calendering a second polyethylene oxide polymer of molecular weight 9 × 10 5 into a film of thickness 1.7 mils; distributing said mixture over the film of said second polyethylene oxide polymer in a mold cell; heating said mold cell to a temperature of 230° F under pressure of 500 psi; and cooling said mold cell under pressure to form the improved molded coating.
Claim 12
Independent Claim
129 words
A method of making an improved drag reduction coating including the steps of: mixing uniformly a powder of a first polyethylene oxide polymer of molecualr weight 4 × 10 6 with 4.8 percent of weight solution of 4, 4' thio-bis (6-tert-butyl meta cresol) in sorbitan monolaurate of theoretical molecular weight 1226 and anisole (methyl phenyl ether) in a fixed ratio by weight forming a mixture; calendering a second polyethylene oxide polymer of molecular weight 9 × 10 5 into a film of thickness 1.7 mils; distributing said mixture over the film of said second polyethylene oxide polymer in a mold cell; heating said mold cell to a temperature of 230° F under pressure of 500 psi; and cooling said mold cell under pressure to form the improved molded coating.
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) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |