US4045185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Autoclave
Assignee: Rhone Poulenc Industries SA
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Filing: 1976-10-20
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Granted: 1977-08-30
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Expires: 1996-10-20
Abstract
Abstract An autoclave for the bulk polymerization of vinyl chloride polymers and copolymers comprising a vessel having one or more agitators in the form of a shaft mounted for rotational movement about a vertical axis and having a helicoidal ribbon, the upper and lower surfaces S 1 S 2 of which are generated by displacement of a straight segment of a line of substantially constant length, when one of the ends describes a helix on a cylinder which forms a surface of the rotatable shaft, said segments being situated during their displacment in planes tangential to said cylinder and forming respectively with the planes perpendicular to the axis of the rotatable shaft, constant angles φ 1 and φ 2 .
Inventors
- 👤 Michel Azemar
- 👤 Lucien Vigliecca
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:24
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/18; B01F; B01F27/00; B01F27/05; B01F27/11; B01F27/114; B01F27/1143; B01F27/80; B01F27/85; B01J19/20; B29; B29B; B29B7/00; B29B7/02; B29B7/06; B29B7/10; B29B7/12; B29B7/14; B29B7/18; B01F27/112; B01F27/1122; B01F27/1123; B01F27/23; B01F27/232; B01F27/2322; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00076; B01J2219/00085; B01J2219/00087; B01J2219/00094; B01J2219/00121; B01J2219/18; B01J2219/185
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
157 words
An autoclave for preparation in bulk of polymers and copolymers based on vinyl chloride comprising a vessel, at least one agitator mounted for rotational movement within said vessel consisting essentially of a ribbon wound in helicoidal turns on a substantially vertical rotatable shaft, the upper surface and the lower surface of said ribbon being respectively surfaces S 1 and S 2 each generated by displacement of a straight segment of a line of substantially constant length, when one of the ends describes a helix on a cylinder which forms a surface of the rotatable shaft, said segments being situated during their displacement in planes tangential to said cylinder, upper surface S 1 extending from the shaft at a negative angle φ 1 with the plane perpendicular to the axis of the rotatable shaft and the lower surface S 2 extending at a positive angle φ 2 with the plane perpendicular to the axis of the rotatable shaft.
Claim 2
Dependent Claim
157 words
An autoclave for preparation in bulk of polymers and copolymers based on vinyl chloride comprising a vessel, at least one agitator mounted for rotational movement within said vessel consisting essentially of a ribbon wound in helicoidal turns on a substantially vertical rotatable shaft, the upper surface and the lower surface of said ribbon being respectively surfaces S 1 and S 2 each generated by displacement of a straight segment of a line of substantially constant length, when one of the ends describes a helix on a cylinder which forms a surface of the rotatable shaft, said segments being situated during their displacement in planes tangential to said cylinder, upper surface S 1 extending from the shaft at a negative angle φ 1 with the plane perpendicular to the axis of the rotatable shaft and the lower surface S 2 extending at a positive angle φ 2 with the plane perpendicular to the axis of the rotatable shaft.
Claim 3
Dependent Claim
66 words
An autoclave as claimed in claim 1, in which the ratio of the pitch h of the helices to the diameter of the agitator is from 0.5 to 5, the angle φ 1 ranges down to -70°, the angle φ 2 ranging up to +70° and the ratio of the diameter of the rotatable shaft to the diameter of the agitator is from 0.5 to 0.9.
Claim 4
Dependent Claim
21 words
An autoclave as claimed in claim 2, in which the pitch h of the helices is constant along the rotatable shaft.
Claim 5
Dependent Claim
20 words
An autoclave as claimed in claim 2, in which the pitch h of the helices varies along the rotatable shaft.
Claim 6
Dependent Claim
48 words
An autoclave as claimed in claim 1, in which the vessel contains one agitator, the shaft of which is aligned with the vertical axis of symmetry of the vessel and which includes an arm on the shaft which sweeps the bottom of the vessel as the agitator rotates.
Claim 7
Dependent Claim
19 words
An autoclave as claimed in claim 5, in which the shaft passes through the upper part of the autoclave.
Claim 8
Dependent Claim
18 words
An autoclave as claimed in claim 5, in which the shaft passes through the bottom of the autoclave.
Claim 9
Dependent Claim
28 words
An autoclave as claimed in claim 1, in which the ratio of the diameter of the agitator to the diameter of the vessel is from 0.25 to 0.7.
Claim 10
Dependent Claim
22 words
An autoclave as claimed in claim 1, in which the shafts of the agitators pass through the upper part of the vessel.
Claim 11
Dependent Claim
31 words
An autoclave as claimed in claim 1, in which at least one of the agitators is hollow and which includes means for circulating a heat exchange fluid through the hollow agitator.
Claim 12
Dependent Claim
42 words
An autoclave as claimed in claim 9 which includes a rotatable shaft which passes through the bottom of the vessel and an arm mounted on the rotatable shaft for sweeping the bottom of the vessel during rotational movement of the rotatable shaft.
References Cited (Backward Citations)
US1934309A
Cited
US3343922A
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US3877881A
Cited
US3749555A
Cited
US3893811A
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US3799917A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |