Process for the production of a pulverulent, tricklable mixture of ethylene/vinyl acetate copolymer and powdery polyvinylchloride

US4088625A · kind A · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Erwin Gubisch · Burghausen, DE
• Walter Kudlich · Burghausen, DE
• Walter Popp · Emskirchen, DE
• Herbert Reinicke

Key dates

• Filing date: Aug 20, 1976
• Grant date: May 9, 1978
• Expiry date: Aug 20, 1996

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/922
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the production of a pulverulent, tricklable mixture of ethylene/vinyl acetate copolymer and polyvinylchloride comprising the steps of mixing a mixture consisting essentially of (a) an ethylene/vinyl acetate copolymer having an acetate content of from 15% to 75% by weight, (b) powdery polyvinylchloride, in a mixture ratio of (a) to (b) of 1:3 to 2:1, and (c) from 0 to 5% by weight of the mixture of additives customary for polymer processing, in a high-speed mixture at temperatures above the softening temperature of said polyvinylchloride and below 170.degree. C., for a time sufficient to effect homogenization, quenching said homogenized mixture with water and removing the water, grinding the quenched product with the addition of from 0.5 to 10 parts by weight of an inert powder having particles in the submicroscopic range, in a high speed mill under passage of an airstream which is heated by friction, and recovering said pulverulent, tricklable mixture; as well as the powdery mixture so produced.