Accession Number : ADD009748

Title :   Method of Recovering a Copolymer.

Descriptive Note : Patent Application,


Personal Author(s) : Douda,Bernard E

Report Date : 09 Apr 1982

Pagination or Media Count : 11

Abstract : The present invention relates to a method for recovering a copolymer used as a binder in pyrotechnic device and, more particularly, to a method for recovering Viton-A, which is a tradename for a copolymer of vinylidene fluoride and hexafluoropropylene. The Viton-A is first dissolved in N-methyl-2-pyrrolidone which has a flash point of 95 degrees C. After Viton-A is dissolved, a flocculant, such as water, is added to the solution and the Viton-A is precipitated and can readily be removed from the liquid. The flocculant and N-methyl-2-pyrrolidone are then separated by fractional distillation. It is therefore a general object of the present invention to provide an improved method for recovering Viton-A from pyrotechnic compositions. Other objects, advantages and novel features of the present invention will become apparent from the following detailed description of the invention.

Descriptors :   *Patent applications, *Copolymers, *Recovery, *Methodology, Crushing, Solvents, Acetones, Butyl radicals, Methylenes, Chlorides, Flash point, Mixtures, Inventions, Pyrotechnics, Chemical precipitation, Distillation, Hazards

Subject Categories : Industrial Chemistry and Chemical Processing
      Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE