US3752623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for production of polyamide moldings
Assignee: BASF SE
•
Filing: 1971-07-14
•
Granted: 1973-08-14
•
Expires: 1991-07-14
Abstract
Abstract An apparatus for the production of moldings by activated anionic polymerization of lactams in which a lactam melt containing a catalyst and a lactam melt containing an activator are separately preheated to polymerization temperature in two melt reservoirs and supplied to a control unit including a pair of valves and a vertically oriented mixing chamber, mixed therein, and forced upwardly into the mold to be filled wherein valve seats for the respective valves are in the wall of said mixing chamber.
Inventors
- 👤 R Sinn
- 👤 R Schellenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:03
CPC Classifications
B; B29; B29C; B29C39/00; B29C39/22; B29C39/24; B29B; B29B7/00; B29B7/74; B29B7/76; B29B7/7615; B29B7/80; B29B7/88; B29B7/90; B29C31/00; B29C31/04; B29C31/041; B29C33/00; B29C33/0061; B29C33/0072; B29K; B29K2077/00; B29K2105/00; B29K2105/0002; B29K2105/0058; B29K2105/0067
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
18 words
Apparatus as claimed in claim 1 wherein said mixing chamber has the shape of an inverted, truncated cone.
Claim 2
Dependent Claim
45 words
Apparatus as claimed in claim 1, pipe means for circulating the respective pumped melts through respective loop circuits back to the respective reservoirs, and throttle valve means in said loop circuits for throttling or closing said loop circuits when said pair of valves are open.
Claim 3
Dependent Claim
220 words
Apparatus for carrying out the process for the production of moldings by activated anionic polymerization of lactams having at least six ring carbons, in which a lactam melt containing a catalyst and a lactam melt containing an activator are separately heated to polymerization temperature and allowed to polymerize in a mold, which comprises two melt reservoirs, means associated with each reservoir for heating or cooling the melt therein, melt-agitaTing means in each reservoir, a control unit including a pair of valves and a vertically oriented mixing chamber, said mixing chamber having the shape of an inverted, truncated cone, respective pipelines communicating said mixing chamber and respective reservoirs via respective valves in said control unit, valve seats for the respective valves in the lower portion of said mixing chamber, pumps in respective pipelines, a melt discharge opening in the upper face of said mixing chamber, a vertically oriented mold detachably mounted on said upper face directly above said chamber and in communication with said discharge opening, in which mold the united melts polymerize as a casting, and the walls of said mixing chamber being free from undercut portions, whereby the mold and the polymerized casting therein may be detached from control unit after polymerization with the contents of the mixing chamber simultaneously being removed as a polymerized sprue on said casting.
Claim 4
Dependent Claim
32 words
Apparatus as claimed in claim 4, the cross-sectional area of the lower end of said inverted, truncated cone mixing chamber being eight to 14 times the inflow area of said valve seats.
Claim 5
Dependent Claim
24 words
Apparatus as claimed in claim 4, the wall of said inverted, truncated cone mixing chamber tapering at a half-apex angle of 3* to 8*.
References Cited (Backward Citations)
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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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |