Process for the preparation of polyvinylbutyral having improved

Details Process for the preparation of polyvinylbutyral having improved Process for the preparation of polyvinylbutyral having improved

1978-07-18

1980-05-27

Levin, Stanford M.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

260 334R, 260 312R, 428437, 525 56, C08F 828

Patent

active

042051460

ABSTRACT:
The preparation of polyvinylbutyral is commonly effected by the acetalization of polyvinyl alcohol with n-butyraldehyde, either in an organic solvent or in water. By varying the reaction conditions it is possible to obtain the polyvinylbutyral in a coarse-grain or fine-grained form. The production of polyvinylbutyral having improved properties is possible by using a polyvinylbutyral having a content of from 17 to 24% by weight of vinyl alcohol units as starting material for an after-treatment in the presence of an organic sulfonic acid having an emulsifying effect. The polyvinylbutyral obtained is particularly suitable for the manufacture of compound sheets.

REFERENCES:
patent: 3153009 (1964-10-01), Rombach

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