Linear, phosphorus-containing copolyester, process for its...

C - Chemistry – Metallurgy – 08 – G

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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.

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