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:
Aug. 07, 1979
Filed:
Jan. 19, 1978
Bernard P Malassine, Vert le Petit, FR;
Jean-Claude C Gautier, Ablon sur Seine, FR;
Sammy H Chevalier, Paris, FR;
Gerard R Berteleau, Ris Orangis, FR;
Societe Nationale des Poudres et Explosifs, Paris, FR;
Abstract
Solutions of polystyrylpyridine are prepared by a novel process which consists of carrying out the polycondensation of at least one aromatic dialdehyde, preferably terephthalic dialdehyde, and at least one pyridinic derivative substituted by at least two reactive methyl groups at a temperature between 150.degree. C. and 200.degree. C. The polycondensation reaction is stopped after the extent of condensation is equal to at least 40%, the polycondensate is then dissolved in a solvent which is methylethylketone, ethyl acetate, methylene chloride, trichloroethylene, chlorobenzene, n-propanol and preferably a mixture of methylethylketone and n-propanol. The polystyrylpyridine solutions obtained according to the process of this invention are useful for the preparation of composite materials which exhibit very good mechanical properties, excellent behavior under conditions of high temperature, flame and chemical and atmospheric agents.