C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 4/00 (2006.01) C08F 8/28 (2006.01) C09D 159/00 (2006.01) C09J 159/00 (2006.01)
Patent
CA 2078095
Hoe 91/F 314 Abstract of the Disclosure Preparation of soluble polyvinyl acetals having a low degree of crosslinking, which show improved melt viscosity character- istics, by acetalization of soluble polyvinyl alcohols having a low degree of crosslinking, which have been obtained by hydrolysis or alcoholysis of soluble copolymers having a low degree of crosslinking of vinyl esters and monomers having multiple ethylenic unsaturations, for example, glyoxal bisacrylamide. As against comparable non-crosslinked, soluble polyvinyl acetals, polyvinyl acetals having a low degree of crosslinking according to the present invention show increased intrinsic viscosities and surprisingly exhibit advantageous properties in thermoplastic forming, in particular when extruded in a plastified form. The polyvinyl acetals having a low degree of crosslinking furthermore have improved mechanical properties in comparison with non-crosslinked polyvinyl acetals and, in the form of plastified films, are particularly advantageously employed in the production of composite glass.
Gutweiler Matthias
Kroggel Matthias
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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