Process for sequentially dispersing and saponifying ethylene-vinyl acetate copolymer
First Claim
Patent Images
1. A process for obtaining finely divided saponified ethylene-vinyl acetate copolymer particles which comprises the sequential steps of:
- (a) dispersing the copolymer in an aqueous dispersion medium containing a dispersing agent for EVA copolymer under such conditions of time and/or temperature that no appreciable saponification of the dispersed copolymer can occur, the resulting dispersion being made up of particles of an average diameter of from about 20 to about 500 microns; and
,(b) saponifying the dispersed copolymer employing a strong base as the saponifying agent under such conditions of time and/or temperature that saponification to a predetermined extent is achieved.
1 Assignment
0 Petitions
Accused Products
Abstract
Finely divided saponified ethylene-vinyl acetate copolymer particles are prepared by forming an aqueous dispersion of the copolymer without effecting any appreciable saponification of the dispersed copolymer and thereafter saponifying the dispersed copolymer to the extent desired.
16 Citations
17 Claims
-
1. A process for obtaining finely divided saponified ethylene-vinyl acetate copolymer particles which comprises the sequential steps of:
-
(a) dispersing the copolymer in an aqueous dispersion medium containing a dispersing agent for EVA copolymer under such conditions of time and/or temperature that no appreciable saponification of the dispersed copolymer can occur, the resulting dispersion being made up of particles of an average diameter of from about 20 to about 500 microns; and
,(b) saponifying the dispersed copolymer employing a strong base as the saponifying agent under such conditions of time and/or temperature that saponification to a predetermined extent is achieved. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
Specification