EXTRUDED POLYSTYRENE FOAM AND METHOD FOR PRODUCING SAME

摘要

An extruded polystyrene foam which is obtained by performing extrusion foaming using a styrene resin and a foaming agent, contains a flame retardant in a proportion of 0.5 parts by weight or more and 8.0 parts by weight or less based on 100 parts by weight of the styrene resin and has an apparent density of 20 kg/m3 or more and 45 kg/m3 or less and a closed cell ratio of 90% or more, in which the foaming agent at least contains HFO and another organic foaming agent,
(i) the blended amount of the HFO is 0.030 mol or more and 0.125 mol or less based on 100 g of the styrene resin,(ii) an organic foaming agent having a polystyrene permeability of 0.5×10−10 cc·cm/cm2·s·cmHg or more is contained as the another organic foaming agent,(iii) an organic foaming agent having a polystyrene permeability of less than 0.5×10−10 cc·cm/cm2·s·cmHg is not contained as the another organic foaming agent, and(iv) the total blended amount of the HFO and the another organic foaming agent is 0.105 mol or more and 0.300 mol or less based on 100 g of the styrene resin.

主权项

1. An extruded polystyrene foam, comprising:
a styrene resin; and from 0.5 parts by weight to 8.0 parts by weight of a flame retardant based on 100 parts by weight of the styrene resin, wherein the extruded polystyrene foam is obtained by the process comprising extruding a styrene resin composition comprising the styrene resin, the flame retardant, and a foaming agent, wherein the extruded polystyrene foam has an apparent density of from 20 kg/m3 to 45 kg/m3 and a closed cell ratio of 90% or more, the foaming agent comprises hydrofluoroolefin and a second organic foaming agent, an amount of the hydrofluoroolefin is from 0.030 mol to 0.125 mol based on 100 g of the styrene resin, the second organic foaming agent comprises an organic foaming agent having a polystyrene permeability of 0.5×10−10 cc·cm/cm2·s·cmHg or more and does not comprise an organic foaming agent having a polystyrene permeability of less than 0.5×10−10 cc·cm/cm2·s·cmHg, and a total amount of the hydrofluoroolefin and the second organic foaming agent is from 0.105 mol to 0.300 mol based on 100 g of the styrene resin.