Thermoplastic plasticized polyvinylbutyral molding composition

US4970253A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Hans D. Hermann · Bad Soden am Taunus, DE
• Kurt Fock · Bad Soden am Taunus, DE
• Klaus Fabian · Kriftel, DE

Key dates

• Filing date: Nov 3, 1987
• Grant date: Nov 13, 1990
• Expiry date: Nov 3, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F8/48
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Thermoplastic plasticized polyvinylbutyral molding compositions, in particular films of improved tensile strength and reduced tackiness are prepared by acetalization of polyvinyl alcohol, capable of association, in the associated state with n-butyraldehyde in aqueous phase in the presence of an acid catalyst and, if appropriate, of an organic sulfonic acid having an emulsifying action, after-treatment of the polyvinylbutyral under acetalization conditions at an elevated temperature in the presence of an organic sulfonic acid having 8 to 30 C atoms and having an emulsifying action, isolation and/or purification of the polyvinylbutyral and, if appropriate, admixture of conventional additives and mixing of the product, which may have been dried, with up to 40% by weight of plasticizer, relative to the polymer/plasticizer mixture, and molding, the plasticizers employed being esters of phthalic acid with C.sub.6 -C.sub.10 -alcohols and/or esters of adipic acid with C.sub.6 -C.sub.10 -alcohols. Use of the films for the manufacture of laminated glass, and laminated glass containing the films as the joining layer.