Polyvinyl acetals having improved melt viscosity characteristics

Details Polyvinyl acetals having improved melt viscosity characteristics Polyvinyl acetals having improved melt viscosity characteristics

1992-10-02

1994-11-22

Reddic, Judy M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524503, 525 57, 525 61, 5263031, 526304, 526306, 526319, 526330, C08L 2904

Patent

active

053670159

ABSTRACT:
Preparation of soluble polyvinyl acetals having a low degree of crosslinking, which show improved melt viscosity characteristics, 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.

REFERENCES:
patent: 2332895 (1943-10-01), D'Alelio
patent: 2332898 (1943-10-01), D'Alelio
patent: 2363297 (1944-11-01), D'Alelio
patent: 4666957 (1987-05-01), Marrocco
patent: 4814529 (1989-03-01), Cartier et al.
patent: 4874814 (1989-10-01), Cartier et al.
patent: 4902464 (1990-02-01), Cartier et al.

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