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:
Jul. 22, 2008
Filed:
Jan. 26, 2005
Masanao Kawabe, Fukuoka, JP;
Masanao Kawabe, Fukuoka, JP;
Nippon Steel Chemical Co., Ltd., Tokyo, JP;
Abstract
The present invention relates to a soluble polyfunctional vinylaromatic copolymer improved in heat resistance, resistance to thermal decomposition, solvent solubility, and processability. The soluble polyfunctional vinylaromatic polymer is obtained by cationically polymerizing, at a temperature of 20 to 120° C., one or more monomer ingredients including 20 to 100 mol % divinylaromatic compound (a) in the presence of a donor ingredient, e.g., a quaternary ammonium salt, with the aid of a Lewis acid catalyst and an initiator represented by the following general formula (1) wherein Rrepresents hydrogen or a monovalent Chydrocarbon group; Rrepresents an aromatic or aliphatic hydrocarbon group having a valence of p; Z represents halogen or Calkoxy or acyloxy; and p is an integer of 1 to 6; provided that when two or more R's and Z's are present per molecule, they may be identical to different from each other.