C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
400/1600, 400/17
C08K 3/22 (2006.01) C08G 63/672 (2006.01) C08L 67/02 (2006.01) C08L 101/00 (2006.01) C09J 167/02 (2006.01)
Patent
CA 1054291
ABSTRACT OF THE DISCLOSURE Thermally stabilized thermoplastic segmented co- polyester elastomer consisting essentially of a multiplicity of recurring short chain ester units and long chain ester units joined through ester linkages, said short chain ester units amounting to 15 to 75 percent by weight of said copoly- ester and being derived from dicarboxylic acid such as an aromatic or cycloaliphatic acid, and an organic diol such as butanediol, and said long chain ester units amounting to 25 to 85 percent by weight of said copolyester and being derived from dicarboxylic acid such as an aromatic or cyclo- aliphatic acid, and a long chain glycol such as polytetra- methylene ether glycol, said copolyester having a melt index of less than 150 and a melting point of at least 90°C., stabilized with 0.05 to 3.0 percent by weight, based on the weight of elastomer, of an alkaline earth oxide. Improved stabilizing effect can be achieved when 0.25 to 2.5 percent by weight, based on the weight of elastomer, of the alkaline earth oxide is used in conjunction with 0.25 to 2.5 percent by weight, based on the weight of elastomer, of a substantial- ly linear polycarbodiimide. Additional optional materials that can be added with the stabilizer, based on the weight of elastomer, include: 0.25 to 5.0 percent by weight of a compound taken from the group consisting of hindered phenols, nitrogen-containing hindered phenols and hindered secondary amines; 0.25 to 5.0 percent by weight of a thioalkyl- propionate ester of 12 to 18 carbon atoms; 0.25 to 5.0 percent by weight of a phosphorous acid ester; or mixtures thereof. A useful adhesive composition comprises (A) 1 to -1- 99 percent by weight of segmented copolyester elastomer, (B) 1 to 99 percent by weight of a compatible low molecular weight thermoplastic resin, and (C) 0.1 to 4.0 percent by weight, based on the weight of elastomer and resin of the alkaline earth oxide stabilizer. A calcium oxide stabilizer mixture in appropriate amounts can be used. -2-
220427
E.i. Du Pont de Nemours And Company
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