Initiators for polymerization

US5223591A · kind A · utility

Assignee

• Ciba-Geigy · US

Inventors

• Johan Nyander · Sollentuna, SE
• Sonny Jonsson · Stockholm, SE
• Bjorn Elman · Märsta, SE
• Ann-Britt Pettersson · Märsta, SE
• Per-Erik Sundell · Strömstad, SE
• Sven Göthe · Bromma, SE
• Jan-Erik Nystrom

Key dates

• Filing date: Nov 25, 1991
• Grant date: Jun 29, 1993
• Expiry date: Nov 25, 2011

Classification

• Technology area (CPC G): Physics
• CPC primary: G03F7/029
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Initiators for cationic polymerization by thermal activation, photochemical activation (UV-irradiation) or activation by electron bombardment are compounds wherein a heterocyclic, aryl substituted or aryl ring is fused to a sulfonium moiety in combination with a non-nucleophilic anion. During the activation of the initiator, a carbon-sulfur bond is broken leading to formation of a sulfide and a carbonium ion within the same molecule. The carbonium ion initiates the polymerization.