US4409187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing agent and lubricant for medium-pressure and high-pressure autoclaves
Assignee: Bayer AG
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Filing: 1981-03-06
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Granted: 1983-10-11
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Expires: 2001-03-06
Abstract
Abstract In an autoclave containing a sealing agent and/or lubricant the improvement wherein said sealing agent or lubricant is a polyether-polyol which has an average OH-functionality of 5.0 to 7.0 and an average OH number of 250 to 500 prepared by reacting a mixture of sucrose and at least one other starting molecule chosen from the group comprising (a) polyhydric alcohols with an OH-functionality of less than 8, (b) monoamines or polyamines which contain at least 2 hydrogen atoms bonded to the amino nitrogen and (c) water, with ethylene oxide and/or propylene oxide.
Inventors
- 👤 Armin Kohler
- 👤 Herbert Schuster
- 👤 Rudi Renner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:01
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/10; C09K3/1006; C09K3/1015; C08; C08G; C08G65/00; C08G65/02; C08G65/26; C08G65/2603; C08G65/2606; C10; C10M; C10M107/00; C10M107/40; C10M107/44; C09K2200/00; C09K2200/06; C09K2200/0645; C09K2200/067; C09K2200/0675; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/105; C10M2209/107; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10N; C10N2040/00; C10N2040/30; C10N2040/32; C10N2040/34; C10N2040/36; C10N2040/38; C10N2040/40; C10N2040/42; C10N2040/44; C10N2040/50
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
118 words
In an autoclave containing a stuffing box, which stuffing box contains a sealing agent and/or lubricant the improvement wherein said sealing agent or lubricant is a polyether-polyol which has an average OH-functionality of 5.0 to 7.0 and an average OH number of 250 to 500 and a molecular weight of 600 to 12,000 and a viscosity of 3 to 22 Pas at 25° C. prepared by reacting a mixture of sucrose and at least one other starting molecule chosen from the group comprising: (a) polyhydric alcohols with an OH-functionality of less than 8, (b) monoamines or polyamines which contain at least 2 hydrogen atoms bonded to the amino nitrogen and (c) water, with ethylene oxide and/or propylene oxide.
Claim 2
Dependent Claim
118 words
In an autoclave containing a stuffing box, which stuffing box contains a sealing agent and/or lubricant the improvement wherein said sealing agent or lubricant is a polyether-polyol which has an average OH-functionality of 5.0 to 7.0 and an average OH number of 250 to 500 and a molecular weight of 600 to 12,000 and a viscosity of 3 to 22 Pas at 25° C. prepared by reacting a mixture of sucrose and at least one other starting molecule chosen from the group comprising: (a) polyhydric alcohols with an OH-functionality of less than 8, (b) monoamines or polyamines which contain at least 2 hydrogen atoms bonded to the amino nitrogen and (c) water, with ethylene oxide and/or propylene oxide.
Claim 3
Dependent Claim
15 words
An autoclave according to claim 1, wherein said autoclave is a medium-pressure and high-pressure autoclave.
Claim 4
Dependent Claim
130 words
An autoclave according to claim 1, wherein said sealing agent or lubricant is a polyetherpolyol prepared by forming a mixture at 20° to 110° C. which contains: (a) 100 parts by weight of sucrose; (b) 2 to 5 parts by weight of water; (c) 2 to 20 parts by weight of a polyhydric alcohol with an OH functionality of less than 8 and/or a monoamine or polyalkylene polyamine or alkylenediamine containing at least 2 hydrogen atoms bonded to the amino nitrogen; (d) 40 to 150 parts by weight of an aromatic hydrocarbon solvent; and (e) 1 to 5 parts by weight of an alkali metal hydroxide and thereafter reacting said mixture with ethylene oxide and/or propylene oxide at 85° to 130° C. under a pressure of 0.3 to 4.0 bars.
Claim 5
Dependent Claim
50 words
An autoclave according to claim 3, wherein said polyether polyol is prepared using in the reaction a polyhydric alcohol, said polyhydric alcohol being selected from the group consisting of ethylene glycol, propylene glycol, 1,4-butanediol, diethylene glycol, dipropylene glycol, trimethylolpropane, glycerol, sorbitol, mannitol, monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, and N-alkylalkanolamine.
Claim 6
Dependent Claim
29 words
A lubricant according to claim 3, wherein said polyether polyol is one prepared by using a monoamine and said monoamine is a lower aliphatic monoalkyl amine or cycloalkyl amine.
Claim 7
Dependent Claim
17 words
An autoclave according to claim 3 wherein said polyether polyol is obtained by reacting a polyalkylene polyamine.
References Cited (Backward Citations)
US1959930A
Cited
DE2241242C3
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |