BLOWING AGENTS FOR EXTRUDED POLYSTYRENE FOAM AND EXTRUDED POLYSTYRENE FOAM AND METHODS OF FOAMING

摘要

Disclosed are methods of forming an expanded polystyrene foam comprising: (a) providing a foamable resin comprising polystryrene and a blowing agent comprising (i) transHFO-1234ze and (ii) transHCFO-1233zd; and (b) extruding said foamable composition through a dye.

主权项

1. A method of forming a thermal insulating extruded, low density polystyrene foam comprising:
(a) providing a foamable resin comprising polystryrene; (b) adding to said resin a blowing agent comprising (i) transHFO-1234ze in an amount of from about 3 wt % to not greater than about 6 wt % of the foamable composition; and (ii) transHCFO-1233zd in an amount of at least about 2 wt % to about 10% by weight of the foamable composition, provided that the total amount of said blowing agent is from about 8 wt % to not greater than about 15 wt % of the foamable composition; and (c) extruding said foamable composition through a dye after the addition step to form low density polystyrene foam having a density of not greater than about 50 Kg/m3 and a k-factor of not greater than about 25 K-W/m-k.