Polymerization of chloroprene

US4839447A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Rudolf Casper · Leverkusen, DE
• Peter Wendling · Leverkusen, DE
• Wolfgang Konter · Neuss, DE
• Gerhard Hohmann · Leverkusen, DE

Key dates

• Filing date: Jul 22, 1988
• Grant date: Jun 13, 1989
• Expiry date: Jul 22, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F36/18
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Storage-stable polychloroprene is obtained, using a polymerization initiator comprising a mixture of PA0 (1) a redox system comprising PA1 (a) a reducing agent selected from the group consisting of PA2 (i) sodium dithionite, PA2 (ii) formamidine sulphinic acid, and PA2 (iii) a mixture from (i) and (ii), PA1 (b) potassium peroxodisulphate as an oxidizing agent and, optionally, PA0 (2) sodium anthraquinone-.beta.-sulphonate as a co-activator in the presence of oxygen, wherein from 10 to 90 by weight of the initiator are present at the commencement of polymerization and the remainder is added during the polymerization, and after a certain degree of conversion the reducing agent is the only component of redox system (1) which remains to be added.