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US 6,444,717 B1Granted
Foamed polyester resins with flame retardant properties
AssigneeSinco Ricerche S.p.A.
InventorsHussain Al Ghatta, Arianna Giovannini, Tonino Severini
Life of this patent
Estimating the term…
Abstract
Flame retardant compositions comprising a polyester resin having a melt strength higher than 8 centinewton an intrinsic viscosity greater than 0.8 dl/g, suitable for the preparation of foamed cellular material and a flame retardant compound capable of not reducing below 3 Nm the torque intake of the resin in a heating test at 280° C. under nitrogen for 10 minutes in the presence of 10% by weight of the flame retardant compound.
Claims7
Compositions of foamed cellular materials comprising:
- an aromatic polyester resin selected from the group consisting of polyethylene terephthalate and copolyethylene terephthalate copolymers in which not more the 20% of the therephtalic acid units are substituted with units deriving from isophthalic acid and naphthalene dicarboxylic acids having a melt strength higher than 8 centiNewton and intrinsic viscosity higher than 0.8 dl/g;
- and
- a flame retardant compound in quantity of from 1 to 15% by weight of the composition, said flame retardant compound being capable of not reducing the torque intake of the resin to values less than 3 Nm when the resin, added with 10% by weight of the compound, is heated at 280° C. for 10 minutes under nitrogen in a rheomix and said flame retardant being a bromo compound selected from the group consisting of N,N′-ethylene-bis(tetrabromophthalimide), tetrabromophthalic anhydride, decabromodiphenylether, octabromodiphenylether, bis(tribromophenoxy)ethane and bis(pentabromophenoxy)ethane.
Dependencies are inferred from the claim text.