Process for the preparation of polyvinylbutyral having...

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

C - Chemistry, Metallurgy

08

F

402/68

C08F 8/28 (2006.01)

Patent

CA 1116784

HOE 77/F 140 PROCESS FOR THE PREPARATION OF POLYVINYLBUTYRAL HAVING IMPROVED PROPERTIES Abstract of the disclosure: The preparation of polyvinylbutyral is commonly effect- ed by the acetalization of polyvinyl alcohol with n-butyr- aldehyde, 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.

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