The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 19, 1990
Filed:
Nov. 15, 1988
Applicant:
Inventor:
Osman T Aboul-Nasr, Leominster, MA (US);
Assignee:
Polysar Financial Services S.A., Fribourg, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ; B29D / ;
U.S. Cl.
CPC ...
159 431 ; 159 46 ; 159 471 ; 159D / ; 159D / ; 264102 ; 425 721 ; 425 722 ; 528501 ;
Abstract
The efficiency of falling strand devolatilizers is related to a number of factors incluidng the foaming of the polymer melt and the time the melt in both foam and strand form is held in the devolatilizer. The level of residual material including monomers, dimers, trimers, and diluents, in a polymer melt may be reduced by passing the melt sequentially through a preheater operated at relatively low pressure then through a horizontal melt distributor at the top of a devolatilizer chamber.