Process for the production of powder-form hydrolyzed ethylene/vinyl acetate copolymers

US4119687A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Raoul Resz · Bensberg, DE
• Herbert Bartl · Odenthal, DE
• Karl Nothen · Leverkusen, DE
• Joachim Priemer · Odenthal, DE
• Aziz El-Sayed · Leverkusen, DE

Key dates

• Filing date: Mar 14, 1977
• Grant date: Oct 10, 1978
• Expiry date: Mar 14, 1997

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S524/904
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process for the production of partially or completely hydrolyzed ethylene/vinyl acetate copolymer which is suitable for the various powder coating techniques, wherein the polymer solution is extruded in a non-gelled state into water with a temperature no more than 20.degree. C below the gellation temperature and the gelling solution is converted into particles from 0.02 to 5 mm in diameter by means of high shear forces.