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:
Mar. 29, 1977
Filed:
Apr. 25, 1975
Applicant:
Inventors:
Rene P Berni, Cliffside Park, NJ (US);
Donald H Lorenz, Basking Ridge, NJ (US);
Earl Pierce Williams, Pen Argyl, PA (US);
Assignee:
GAF Corporation, New York, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ; B08B / ; C07D / ; C07D / ;
U.S. Cl.
CPC ...
203 64 ; 134 12 ; 203 57 ; 2602 / ; 2603 / ;
Abstract
N-lower alkyl lactam solvent is recovered from a solution of polymer such as PVC residue in such solvent by adding to the solution a plasticizer for the polymer and then recovering the lactam from the solution by distillation. The plasticizer has a boiling point of at least about 25.degree. C above the boiling point of the lactam solvent. A stabilizer for the polymer may also be used.