US4263250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricant and release agent for molded rubber articles
Assignee: Evonik Operations GmbH
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Filing: 1979-09-25
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Granted: 1981-04-21
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Expires: 1999-09-25
Abstract
Abstract A composition which possesses both good lubrication and release properties for use in the manufacture of molded rubber articles composed of a mixture of (a) monoalkyl ethers of oxyethylene-oxypropylene copolymers, in which the weight ratio of oxyethylene groups to oxypropylene groups is 25 to 75:75 to 25; and (b) polyoxyalkylene-polysiloxane copolymers in which the components (a) are soluble or dispersible.
Inventors
- 👤 Gunter Schmidt
- 👤 Hans-Ferdi Fink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:35
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/56; B29C33/60; B29C33/62; C; C10; C10M; C10M107/00; C10M107/20; C10M107/30; C10M107/32; C10M107/34; C10M107/50; C10M155/00; C10M155/02; C10M169/00; C10M169/04; C10M2205/00; C10M2205/003; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/1033; C10M2209/104; C10M2209/1045; C10M2209/105; C10M2209/1055; C10M2209/106; C10M2209/1065; C10M2209/107; C10M2209/1075; C10M2209/108; C10M2209/1085; C10M2209/109; C10M2209/1095; C10M2229/00; C10M2229/02; C10M2229/025; C10M2229/04; C10M2229/0405; C10M2229/041; C10M2229/0415; C10M2229/042; C10M2229/0425; C10M2229/043; C10M2229/0435; C10M2229/044; C10M2229/0445; C10M2229/045; C10M2229/0455; C10M2229/046; C10M2229/0465; C10M2229/047; C10M2229/0475; C10M2229/048; C10M2229/0485; C10M2229/05; C10M2229/0505; C10M2229/051; C10M2229/0515; C10M2229/052; C10M2229/0525; C10M2229/053; C10M2229/0535; C10M2229/054; C10M2229/0545; C10N; C10N2040/00; C10N2040/30; C10N2040/32; C10N2040/34; C10N2040/36; C10N2040/38; C10N2040/40; C10N2040/42; C10N2040/44; C10N2040/50; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
104 words
In a method for manufacturing molded rubber articles wherein a release agent is applied to a mold, the rubber composition is applied to the mold and then subjected to vulcanization conditions, the improvement which comprises said release agent being a mixture of (a) monoalkyl ethers of oxyethylene-oxypropylene copolymers in which the weight ratio of oxyethylene groups to oxypropylene groups is 25 to 75:75 to 25, wherein the monoalkyl ethers are formed from the addition of ethylene oxide and propylene oxides to a lower alcohol containing from 1 to 6 carbon atoms, and (b) polyoxyalkylene-polysiloxane copolymers in which the components (a) are soluble or dispersible.
Claim 2
Dependent Claim
104 words
In a method for manufacturing molded rubber articles wherein a release agent is applied to a mold, the rubber composition is applied to the mold and then subjected to vulcanization conditions, the improvement which comprises said release agent being a mixture of (a) monoalkyl ethers of oxyethylene-oxypropylene copolymers in which the weight ratio of oxyethylene groups to oxypropylene groups is 25 to 75:75 to 25, wherein the monoalkyl ethers are formed from the addition of ethylene oxide and propylene oxides to a lower alcohol containing from 1 to 6 carbon atoms, and (b) polyoxyalkylene-polysiloxane copolymers in which the components (a) are soluble or dispersible.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the alcohol is selected from the group consisting of n-butanol, glycol, propylene glycol and glycerin.
Claim 4
Dependent Claim
25 words
The method of claim 1 wherein the monoalkyl ethers of the oxyethylene-oxypropylene copolymers have a molecular weight in the range from about 1,200 to 10,000.
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) | 1984-04-20 | 1984-10-20 | 1985-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-20 | 1988-10-20 | 1989-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-20 | 1992-10-20 | 1993-04-21 | $7700.00 | Window Closed / Lapsed |