Foamed beads of polyester resin
AssigneeSinco Ricerche S.p.A.
InventorsHussein Al Ghatta, Tonino Severini, Luigi Pulcini
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Abstract
Foamed beads of polyester resin having rheological and crystallizability characteristics suitable for the preparation of foamed articles by sintering beads in a mold heated with superheated steam or with inert gas or air.
Claims11
Foamed beads of aromatic polyester resin, having a density between 30 and 500 kg/m3, wherein the resin that constitutes the particles has a melt strength of more than 1 cN at 280° C., a melt viscosity of more than 1500 Pa.s at 280° C. with shear rate tending to zero, a die swell index of more than 150% and a crystallization rate such that by heating at 120° C. for 5 minutes crystallinity does not exceed 15%.
Dependencies are inferred from the claim text.