Process for preparing pellets of saponified ethylene/vinyl acetate copolymer
First Claim
1. A method of continuously producing saponified ethylene-vinyl acetate copolymer pellets by continuously extruding a solution of a saponified ethylene-vinyl acetate copolymer in the form of a strand into a coagulation liquid and then cutting the resulting strand, characterized in that the ratio between the weight X of the coagulation liquid and the weight Y of the strand, prior to coagulation of the extruded solution, of the saponified ethylene-vinyl acetate copolymer, namely the ratio X/Y is set at 100 to 10,000.
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Abstract
In the method of continuously producing pellets by continuously extruding a saponified ethylene-vinyl acetate (EVOH) solution in a strand form into a coagulation liquid and then cutting the resulting strand, the ratio between the weight X of the coagulation liquid and the weight Y of the strand of the saponified ethylene-vinyl acetate copolymer, namely the ratio X/Y, is set at 50 to 10,000. The coagulation liquid preferably contains 1 to 10,000 ppm of a carboxylic acid, 1 to 50,000 ppm of a carboxylic acid ester, or 1 to 15,000 ppm of a carboxylic acid salt. It is preferred as well that the water content of the continuously produced EVOH pellets be adjusted to 20 to 80% by weight and then brought into contact with an aqueous solution, having at least one boron compound, an acetic acid salt and a phosphoric acid compound.
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6 Claims
- 1. A method of continuously producing saponified ethylene-vinyl acetate copolymer pellets by continuously extruding a solution of a saponified ethylene-vinyl acetate copolymer in the form of a strand into a coagulation liquid and then cutting the resulting strand, characterized in that the ratio between the weight X of the coagulation liquid and the weight Y of the strand, prior to coagulation of the extruded solution, of the saponified ethylene-vinyl acetate copolymer, namely the ratio X/Y is set at 100 to 10,000.
Specification