Process for preparing polyvinyl butyral

Details Process for preparing polyvinyl butyral Process for preparing polyvinyl butyral

1983-02-18

1985-08-06

Michl, Paul R.

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

Synthetic resins

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

C08G 1856

Patent

active

045336970

ABSTRACT:
The invention relates to a process for preparing polyvinyl butyral comprising simultaneously introducing into a reaction medium containing a mixture of water and a portion of reactive polyvinyl alcohol, maintained initially at a temperature below about 20.degree. C., a stream of an aqueous solution of polyvinyl alcohol corresponding to the complement of the reactive polyvinyl alcohol and a stream of butyraldehyde and cooling the reaction mixture during the introduction of the polyvinyl alcohol and butyraldehyde. The reaction is also carried out in the presence of an acid catalyst and an emulsifying agent.
The polyvinyl butyral obtained is used, after plasticizing, as an interlayer in laminated glass.

REFERENCES:
patent: 3153009 (1964-10-01), Rombach
patent: 4205146 (1980-05-01), Hermann et al.
patent: 4230771 (1980-10-01), Phillips
patent: 4276351 (1981-06-01), Phillips
patent: 4292372 (1981-09-01), Moynihan
patent: 4390594 (1983-06-01), Dages

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