Patent ID: 6579837
Filing Date: 2003-06-17
Classification: C08G,C08L,C11D

Abstract:
A terephthalic polyester composition (TPC), comprising, as a mixturea polyethylene terephthalate homooligomer (PET1) consisting essentially of oxyethylene terephthalate (TE) repeat units of formula (I): â€”C(O)â€”Aâ€”C(O)â€”Oâ€”CH2â€”CH2â€”Oâ€”â€ƒâ€ƒ(I) wherein A represents the 1,4-phenylene group, and a block terephthalic copolymer (PET2/TE-POE) comprising: at least one polyethylene terephthalate block (PET2) composed of oxyethylene terephthalate (TE) repeat units of formula (I) â€”C(O)â€”Aâ€”C(O)â€”Oâ€”CH2â€”CH2â€”Oâ€”â€ƒâ€ƒ(I) wherein A represents the 1,4-phenylene group, and at least one polyoxyethylene terephthalate block (TE-POE) of formula: â€”C(O)â€”Aâ€”C(O)â€”Oâ€”CH2â€”CH2â€”Oâ€”(CH2â€”CH2â€”O)nâ€”all the (TE) units present in said (TPC) composition represent at least 11% by weight of the weight of said (TPC) composition, said (TPC) composition presenting mono(oxyethyleneoxy) (OEO) residues of formula: 1/2Oâ€”CH2â€”CH2â€”O1/2 said (OEO) residues belonging to the oxyethylene aromatic diester (OAD) groups of formula: â€”Aâ€”C(O)â€”Oâ€”CH2â€”CH2â€”Oâ€”C(O)â€”Aâ€”â€ƒpresent in all the (PET1) and (PET2) blocks, and wherein the value of n of the polyoxyethylene terephthalate block (TE-POE) of formula: â€”C(O)â€”Aâ€”C(O)â€”Oâ€”CH2â€”CH2â€”Oâ€”(CH2â€”CH2â€”O)nâ€”â€ƒis such that said block exhibits a number-average molecular mass of 3 000 to 4 000, the (TE) units of the polyethylene terephthalate (PET1) does not represent more than 7% by weight of all the (TE) units present in the terephthalic polyester composition (TPC), all the (TE) units present in said (TPC) composition represent from 11.5 to 17% by weight, of the weight of said (TPC) composition, the mono(oxyethyleneoxy) (OEO) residues of formula: 1/2Oâ€”CH2â€”CH2â€”O1/2 â€ƒrepresents from 1.3 to 2.3% by weight, of the weight of said terephthalic polyester composition (TPC), and the weight-average molar mass of said block terephthalic copolymer (PET2/TE-POE) is at least 40 000.