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:
Nov. 01, 1977
Filed:
Nov. 21, 1974
Lubomir Lochmann, Prague, CS;
Jiri Trekoval, Prague, CS;
Ceskoslovenska akademie ved, Prague, CS;
Abstract
The invention relates to anionic polymerization and copolymerization of methacrylate and acrylate esters and related polar monomers, e.g. acrylonitrile, by initiation with carboxylic acid esters formally substituted in the .alpha.-position with Li, Na, K, Rb or Cs and containing 3 - 30 C atoms in the straight or branched chain and 1 - 6 ester group in one molecule either alone or in the presence of C.sub.3 - C.sub.16 alkali metal alkoxide with the straight or branched chain. The polymerization or copolymerization is carried out at -80.degree. to +50.degree. C, advantageously at 20.degree. C and the molar ratios of monomers to .alpha.-metallo ester 10 to 1500 and alkoxide to .alpha.-metallo ester 0.5 to 80. Instead of the pure isolated .alpha.-metallo esters also a reaction mixture may be used which was prepared from the alkaline salt of substituted organic amide and non-metallated ester. Aliphatic, cycloaliphatic or aromatic hydrocarbons, organic ethers or their mixtures were used as solvents for both monomers and initiatora. The method is also suitable for preparation of block copolymers of the aforesaid monomers, if the second or further comonomer is always added after the completed polymerization of the preceding monomer and if the subsequent monomers are used either of the equal anionic polymerizability or in the sequence of their increasing anionic polymerizability.