Patent US4830801A successfully refreshed from Google Patents.
US4830801A
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US
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Degassing process for a worm extruder
Assignee: United Initiators GmbH and Co KG
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Filing: 1987-11-12
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Granted: 1989-05-16
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Expires: 2007-11-12
Abstract
Abstract Process for a worm extruder or continuous kneader to produce either a degasses paste or plastic composition is disclosed. A mixture of either solid or liquid organic peroxides in the paste or plastic composition having evaporable constituents are introduced into the device, homogenized and degassed by exposing the mixture to a degassing passage of the extruder. The mixture has a free surface which is more than 40% of the cross-section of the degassing passage and the minimum gas passage cross-section of the return delivery device amounts to at least about 0.1 times the degassing passage cross-section.
Inventors
- 👤 Erwin Rossberger
- 👤 Josef Weinmaier
- 👤 Nikolaus Ailler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:50
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/76; B29C48/763; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/42; B29B7/428; B29B7/429; B29B7/46; B29B7/48; B29B7/488; B29B7/489; B29B7/58; B29B7/60; B29B7/80; B29B7/84; B29B7/842; B29B7/845; B29B7/86; B29C48/505; B29C48/55; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92009; B29C2948/92019; B29C48/03
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
144 words
A continuous process for the production of a peroxide-containing composition of high peroxide content in the form of a paste or a plastic comprising: introducing into a worm extruder a mixture of a peroxide-containing composition having at least 40 wt % of peroxide in solid or liquid form and evaporable constituents; homogenizing the mixture therein; and degassing the mixture therein to free said mixture of the evaporable constituents by: exposing to a degassing passage of the extruder a free surface area of the mixture which is more than about 40% of the cross-section of the degassing passage; providing a minimum gas passage in the degassing passage which is at least about 0.1 times the cross section of the degassing passage; and providing a return conveyor device in the degassing passage for returning to the extruder substantially of the mixture which enters the degassing passage.
Claim 2
Dependent Claim
144 words
A continuous process for the production of a peroxide-containing composition of high peroxide content in the form of a paste or a plastic comprising: introducing into a worm extruder a mixture of a peroxide-containing composition having at least 40 wt % of peroxide in solid or liquid form and evaporable constituents; homogenizing the mixture therein; and degassing the mixture therein to free said mixture of the evaporable constituents by: exposing to a degassing passage of the extruder a free surface area of the mixture which is more than about 40% of the cross-section of the degassing passage; providing a minimum gas passage in the degassing passage which is at least about 0.1 times the cross section of the degassing passage; and providing a return conveyor device in the degassing passage for returning to the extruder substantially of the mixture which enters the degassing passage.
Claim 3
Dependent Claim
11 words
Process according to claim 1, wherein the degassing is in vacuo.
Claim 4
Dependent Claim
27 words
Process according to claim 1 in which the degassing passage has an axis perpendicular to its cross-section which is perpendicular to the axis of the worm extruder.
Claim 5
Dependent Claim
26 words
Process according to claim 3 in which the return conveyor device comprises a conveyor roll whose axis is parallel to the axis of the worm extruder.
Claim 6
Dependent Claim
146 words
A continuous process for the production of a peroxide-containing composition of high peroxide content in the form of a paste or a plastic, comprising: introducing into a continuous kneader of mixture of a peroxide-containing composition having at least 40 wt. % of peroxides in solid or liquid form and evaporable constituents; homogenizing the mixture therein; and degassing the mixture therein to free said mixture of the evaporable constituents by: exposing to a degassing passage of the continuous kneader a free surface area of the mixture which is more than about 40% of the cross-section of the degassing passage; providing a minimum gas passage in the degassing passage which is at least about 0.1 times the cross section of the degassing passage; and providing a return conveyor device in the degassing passage for returning to the kneader substantially all of the mixture which enters the degassing passage.
Claim 7
Dependent Claim
146 words
A continuous process for the production of a peroxide-containing composition of high peroxide content in the form of a paste or a plastic, comprising: introducing into a continuous kneader of mixture of a peroxide-containing composition having at least 40 wt. % of peroxides in solid or liquid form and evaporable constituents; homogenizing the mixture therein; and degassing the mixture therein to free said mixture of the evaporable constituents by: exposing to a degassing passage of the continuous kneader a free surface area of the mixture which is more than about 40% of the cross-section of the degassing passage; providing a minimum gas passage in the degassing passage which is at least about 0.1 times the cross section of the degassing passage; and providing a return conveyor device in the degassing passage for returning to the kneader substantially all of the mixture which enters the degassing passage.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-15 | 1992-11-14 | 1993-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-15 | 1996-11-14 | 1997-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-15 | 2000-11-14 | 2001-05-16 | $7700.00 | Window Closed / Lapsed |