Poly-2-isopropenylnaphthalene poly-butadiene-1,3-block copolymers and method for their production

US4360639A · kind A · utility

Assignee

• Bergwerksverband GmbH · DE

Inventors

• Rolf Schulz · Dinslaken, DE
• Dieter Engel · Kelsterbach, DE

Key dates

• Filing date: Dec 7, 1981
• Grant date: Nov 23, 1982
• Expiry date: Dec 7, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F297/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Poly-2-isopropenylnaphthalene-poly-butadiene-1,3-block copolymers and method for their production. Di- or tri-block polymers with molecular weights of at least 10,000 are formed from, respectively, a poly-2-isopropenylnaphthalene block and a poly-butadiene-1,3 block, and a poly-2-isopropenylnaphthalene block and a poly-butadiene-1,3 block as well as a further poly-2-isopropenylnaphthalene block. The products display rubber-elastic characteristics of the known block polymerizates, with improved high-temperature stability. The polymers are formed by reacting 2-isopropenylnaphthalene in an inert, aliphatic or cycloaliphatic hydrocarbon solvent, at low temperature, with alkalimetal, alkalimetalalkylene, -arylene or -hydride catalyst, into a poly-2-isopropenylnaphthalene block. This formed polymeric anion then has poly-butadiene-1,3-block added to it at its active chain end. If necessary, a second poly-2-isopropenylnaphthalene block is added. The reaction becomes terminated in known manner through the addition of water, alcohol or acid. Lithium-alkyl is the preferred catalyst; tetrahydrofuran is the preferred solvent; the reaction is performed at temperatures between 0.degree. and -80.d…