Patent GB-1115767-A (GB)
Title: Block copolyesters
IPC: C08G63/685
Filed: 1965-08-04
Abstract: Block copolyesters having a melting-point of at least 150 DEG  C and an intrinsic viscosity of 0.75 to 1.75 contain blocks of (a) a crystallizable polyester having an intrinsic viscosity of 0.1 to 0.5, and (b) a tractable rubbery polyester having an intrinsic viscosity of 0.2 to 0.95 and above that of the crystallizable polyester; the weight ratio of (a) to (b) being from 10:65 to 90:35.  The block copolyesters are made by joining the two polyesters together with an interlinking agent, e.g. azelaoyl - bis - N - caprolactam, terephthaloylbis - N - butyrolactam, 2:5 - dichloroterephthaloyl - bis - N -caprolactam, terephthaloylbis - N - caprolactam, sebacoyl - bis - N - succinimide and sebacoyl-bis-N-phthalimide.  Reaction may be effected in the melt phase or in solution.  Either the two polyesters and the interlinking agent may be reacted simultaneously or the interlinking agent may first be reacted with one polyester and the product reacted with the other polyester.  Specified reactants for making the crystalline polyesters are: dicarboxylic acids-terephthalic, isophthalic, naphthalene dicarboxylic and 2:2-dimethylmalonic acid and mixtures thereof with other dicarboxylic acids; glycols-ethylene glycol, propylene glycol, tetramethylene glycol, neopentyl glycol, 1:4-cyclohexanedimethanol and 1:4-cyclohexanediol. Specified crystalline polyesters are polyethylene terephthalate, polyneopentyl terephthalate, polyneopentyl-2:2-dimethyl malonate, polyethylene - 2:6-naphthalate, polytetramethylene terephthalate, polytetramethylene - 2:6 - naphthalate, polytrimethylene - 2:6 - naphthalate, poly - 1:4-cyclohexylenedimethylene terephthalate; also copolyesters of ethylene terephthalate or polytetramethylene terephthalate and up to 20 mol. per cent of isophthalic, adipic, hexahydroterephthalic or azelaic acids; copolyesters of poly - 1:4 - cyclohexylenedimethylene terephthalate and 10 to 30 mol. per cent of azelaic acid; and copolyesters of polyethylene-2:5- or 2:6-naphthalate and 10 to 20 mol. per cent of azelaic acid. Specified reactants for making the rubbery polyesters are: dicarboxylic acids-adipic, suberic, azelaic, sebacic, dodecanoic, dimeric fatty, isophthalic, 5-tertiary butylisophthalic, terephthalic, hexahydroterephthalic, hexahydroisophthalic and naphthalene dicarboxylic acids; glycols-tetrato deca-methylene glycols, neopentyl glycol, 2:5-hexanediol, 1:4-cyclohexanediol, 1:4 - cyclohexanedimethanol, diethylene glycol and triethylene glycol; polyfunctional compounds (in an amount of up to 1.7 mol. per cent based on the dicarboxylic acid)-trimethylolpropane, pentaerythritol, glycerol, trimeric acid and pyromellitic acid. Specified rubbery polyesters are copolyesters of tere- and/or iso-phthalic acid (20 to 60 mol. per cent), aliphatic dicarboxylic acids containing 6 to 12 carbon atoms (40 to 80 mol. per cent) and polymethylene glycols containing 4 to 10 carbon atoms and the same modified by a small amount of trimethylolpropane; copolyesters of tere- and/or iso-phthalic acid, 5-tertiary butylisophthalic acid (5 to 50 mol. per cent), aliphatic dicarboxylic acids containing 6 to 12 carbon atoms and polymethylene glycols containing 4 to 10 carbon atoms; and a copolyester of terephthalic acid, isophthalic acid, dimer acid, 1:6-hexanediol and trimethylol propane.  Uses. - Elastic fibres, films, adhesives, binders, extruded articles and coatings (e.g. for paper, felt or wire).