Patent ID: 8883052
Filing Date: 2014-11-11
Classification: B29B,B29C,C08F,Y02P,Y10T

Abstract:
1. A method for producing a polyvinyl butyral resin pellet comprising: adjusting a water content of polyvinyl butyral resin powder to 0.01 to 6 wt.%; melting polyvinyl butyral resin powder with a water content of 0.01 to 6 wt% in a melt extruder that includes at least one vent portion for devolatilization equipped with a vacuum and extruding a melt of polyvinyl butyral resin without adding water to said extruder during melting and extruding; and cutting a melt of the polyvinyl butyral resin after extrusion of the melt from the melt extruder wherein said melt of the polyvinyl butyral resin after extrusion has a total content of butyl aldehyde and 2-ethyl-2-hexenal of 100 wt. ppm or less.