Process for drying wet particles of hydrolyzed ethylene-vinyl acetate copolymer
AssigneeNippon Gohsei Kagaku Kogyo Kabushiki Kaisha
InventorsHiroshi Takida, Akio Kido, Masazumi Takahashi
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Abstract
Process for drying wet particles of hydrolyzed ethylene-vinyl acetate copolymer under the specific condition as follows: A. a pressure in a dryer of not more than 120 mmHg, B. a temperature of the heating surface of dryer of not more than 100.degree. C., and C. T .times. .theta..sup.0.6 .ltoreq. 320, wherein T is a temperature (.degree. C.) of the heating surface of dryer and .theta. is a residence time (hour) of the particles in the dryer. The thus obtained particles have excellent molding properties.
Claims1
In a process for drying wet particles of hydrolyzed ethylene-vinyl acetate copolymer having an ethylene content of 20 to 50% by mole, a vinyl acetate content of 80 to 50% by mole and a degree of hydrolysis in vinyl acetate component of at least 90% by mole obtained by hydrolyzing ethylene-vinyl acetate copolymer in a medium, the improvement which comprises carrying out the drying under a pressure in a dryer of up to 120 mmHg, a temperature of the heating surface of the dryer of up to 100.degree. C., and such that T .times. .theta..sup.0.6 .ltoreq. 320 wherein T is a temperature (.degree.C.) of the heating surface and .theta. is a residence time of the particles in the dryer.
Dependencies are inferred from the claim text.