C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/188, 400/450
C08G 63/692 (2006.01) C08L 67/02 (2006.01) C08L 85/02 (2006.01)
Patent
CA 1318453
LINEAR, PHOSPHORUS-CONTAINING COPOLYESTER PROCESS FOR ITS PREPARATION AND ITS USE AS A FLAME RETARDANT AGENT Abstract A linear copolyester, useful as a flame retardant agent, contains in its macromolecule units deriving from: (a) terephthalic acid; (b) (C2-C6)-alkylene glycol; (c) phanyl-hydroxymethylene phosphonic acid, in a mutual ratio comprised within the range of from 1 : 1 : 0.2 to 1 : 1 : 1, and is obtained by placing a linear polyester deriving from terephthalic acid and a (C2-c6)- alkylene glycol into contact with a polytphenyl- hydroxymethylene phosphinate) (I): Image (I) wherein: Ph is the phenyl rsdical; R is a hydrogen atom or a linear or branched alkyl radical containing from 1 to 8 carbon atoms; and is a number comprised within the range of from 2.5 to 100, under melting conditions, and for a contact time not longer than about 30 minutes. Such a copolyester contains the (c) units randomly distributed throughout the macromolcular chain, has an amorphous or partially crystalline structure as a function of its content of said (c) unit, and is useful in order to endow the linear polyesters, also in mixture with one another (polymeric alloys), with flameproof characteristics.
594467
Landoni Gianluigi
Neri Carlo
Enichem Synthesis S.p.a.
Robic
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