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:
Sep. 05, 1978
Filed:
Mar. 16, 1977
Rudolf Puffr, Prague, CS;
Jan Sebenda, Prague, CS;
Ceskoslovenska akademie ved, Prague, CS;
Abstract
The invention relates to a method for the cationic polymerization of lactams either substituted or unsubstituted on the lactam ring, which contain 6-16 carbon atoms, in the presence of 0.05 - 10 mol. % based on the lactam of an anhydrous salt of Cu, Zn, B, Al, Ti, Si, V, Sb, Bi, Cr, Mo, W, Mn, Fe, Co, Ni and an inorganic or organic anion such as phosphate, pyrophosphate, phosphite, sulfate, halide, carboxylate and sulfonate in the presence of 0.05 - 5 mol. % of a protic organic or inorganic acid such as pyrophosphoric, phosphorous, hydrohalic carboxylic and sulfonic. These additives can be added to lactam below 180.degree. C and the polymerization is carried out at 150.degree. - 320.degree. C for 0.1 - 200 hr. The above-specified salts, also their mixtures, can be used. The polymerization can be carried out with mixtures containing two or more lactams. The process can be carried out in a solvent and in the presence of various anhydrous inorganic fillers, such as glass fibers, ground minerals, powdered metals, metal oxides, phosphates, sulfates or sulfides or graphite. The process can also be effectively conducted in the presence of organic dyes, plasticizers and emulsifiers. If the polymerization is performed with the salts of cations which are spontaneously reduced by the lactam during polymerization, finely dispersed metals are formed and remain suspended in the polymer.