Process for making polyvinyl butyral glass laminates

Details Process for making polyvinyl butyral glass laminates Process for making polyvinyl butyral glass laminates

Filed on

1985-05-13

Date issued

1987-03-24

Examiner

Weston, Caleb

Patent Class

Adhesive bonding and miscellaneous chemical manufacture

SubClass

Methods

SubSubClass

Surface bonding and/or assembly therefor

Other Related Categories

15624411, 525 61, B32B 1710, B32B 3106

Type

Patent

Status

active

Patent number

046523200

Description

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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