Heat-resistant maleimido polymers/block copolymers

US5591816A · kind A · utility

Assignee

• Atochem · FR

Inventors

• Sunil K. Varshney · Grivegnée, BE
• Philippe Teyssie · Flémalle, BE
• Roger Fayt · Neupré, BE

Key dates

• Filing date: Dec 16, 1993
• Grant date: Jan 7, 1997
• Expiry date: Dec 16, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F122/40
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Novel N-substituted maleimide homopolymers having a number-average molecular weight ranging from 12,000 to about 100,000 are prepared by anionically polymerizing an N-substituted maleimide monomer, in solvent phase, in the presence of at least one organometallic polymerization initiator which comprises sec-butyllithium, a sodium alcoholate, diphenylmethylpotassium, naphthalenelithium or naphthalenesodium, and novel N-substituted maleimide homopolymers having a polydispersity index ranging from 1.1 to 1.5 are prepared by anionically polymerizing an N-substituted maleimide monomer, in solvent phase, in the presence of at least one alkali metal organometallic polymerization initiator and at least one inorganic or organic salt of an alkali or alkaline earth metal; novel block copolymers include blocks of the above maleimido homopolymers and, e.g., blocks of an acrylic or methacrylic polymer.