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公开(公告)号:US3551943A
公开(公告)日:1971-01-05
申请号:US3551943D
申请日:1966-12-19
CPC分类号: B29C47/92 , B29C47/0014 , B29C47/0016 , B29C47/0021 , B29C47/003 , B29C2947/922 , B29C2947/92209 , B29C2947/92695 , B29C2947/92704 , B29C2947/92895 , B29C2947/92923 , C08F8/50 , C08F2810/10 , C08F8/06 , C08F110/06
摘要: A SYSTEM FOR THE CONTROLLED SCISSION OF POLYPROPYLENE COMPRISES AN EXTRUDER-REACTOR, MEANS FOR MEASURING A PARAMETER OF MOLECULAR WEIGHT OF POLYPROPYLENE AFTER PASSING THROUGH THE EXTRUDER-REACTOR, AND FEEDBACK MEANS FOR CHANGING THE CONDITIONS IN THE EXTRUDER-REACTOR IN RESPONSE TO THE PARAMETER OF MOLECULAR WEIGHT MEASURED. THIS SYSTEM MAY CONTAIN A PELLETIZER AND A CONTINUOUS RHEOMETER WHICH MEASURES THE PARAMETER OF MOLECULAR WEIGHT OF THE PELLETIZED POLYPROPYLENE.
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公开(公告)号:US3608001A
公开(公告)日:1971-09-21
申请号:US3608001D
申请日:1969-08-26
CPC分类号: B29C47/92 , B29C47/0014 , B29C47/0021 , B29C2947/922 , B29C2947/92314 , B29C2947/92447 , B29C2947/92485 , B29C2947/92514 , B29C2947/92695 , B29C2947/92704 , B29C2947/92895 , B29C2947/92904 , B29C2947/92961 , C08F8/50 , C08F2810/10 , C08F110/06 , C08F8/06
摘要: A process for producing in a reproducible, predictable and controllable manner a polypropylene having a desired weight average molecular weight and molecular weight distribution by heating the polypropylene in an extruder-reactor, sampling a portion of the polypropylene to measure a parameter of molecular weight and controlling the conditions in the extruder-reactor in response to the measured parameter.
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公开(公告)号:US3563972A
公开(公告)日:1971-02-16
申请号:US3563972D
申请日:1969-10-15
发明人: KOWALSKI RONALD C
CPC分类号: C08F8/50 , B29C47/0004 , B29C47/0009 , B29C2947/92695 , B29C2947/92857 , B29K2023/12 , C08F2810/10 , C08F110/06 , C08F8/06
摘要: A METHOD FOR PRODUCING A POLYPROPYLENE COMPOSITION HAVING A MELT ELASTICITY (SWELL) VALUE BETWEEN 1.5 AND 3.0 COMPRISES CONTACTING THE POLYPROPYLENE WITH OXYGEN, HEATING THE POLYPROPYLENE IN THE FEED-END OF AN EXTRUDERREACTOR AT TEMPERATURE BETWEEN 600* AND 1,000*F. AND THEN COOLING THE POLYPROPYLENE TO A MELT TEMPERATURE NOT IN EXCESS OF 600*F. A POLYPROPYLENE COMPOSITION HAVING A MELT ELASTICITY (SWELL) OF LESS THAN 3.0 HAS A MOLECULAR WEIGHT DISTRIBUTION WHICH IS VERY NARROW AS COMPARED TO COMMERICAL POLYPROPYLENE COMPOSITIONS.
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公开(公告)号:US3593011A
公开(公告)日:1971-07-13
申请号:US3593011D
申请日:1968-05-09
CPC分类号: G05D24/02 , B29C47/0016 , B29C47/0023 , B29C47/92 , B29C2947/922 , B29C2947/92314 , B29C2947/92447 , B29C2947/92485 , B29C2947/92514 , B29C2947/926 , B29C2947/92695 , B29C2947/92704 , B29C2947/9279 , B29C2947/92876 , G06G7/58
摘要: A simple analogue control device for controlling chemical processes comprises a primary interfacing circuit, and analogue computer circuit, a memory-controller, and a process control circuit. The memory-controller circuit in its most specific aspect comprises a recorder-controller, a storage device which stores the output voltage from the recorder-controller, a switch between the recorder-controller and the storage device, and a timer circuit which sequentially opens the switch between the recorder-controller in the storage device, actuates the pen motor of the recorder-controller to allow the pen to take a new position in response to the input voltage signal into the recorder-controller, deactivates the motor establishing a new output voltage proportional to the input voltage signal and closes the switch to store the new output voltage.
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