C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 63/78 (2006.01) C08G 63/85 (2006.01) C08G 63/183 (2006.01)
Patent
CA 2419438
Macrocyclic oligoesters and compositions comprising macrocyclic oligoesters are prepared from intermediate molecular weight polyesters. In one embodiment, a diol is contacted with a dicarboxylic acid or a dicarboxylate in the presence of a catalyst to produce a composition comprising a hydroxyalkyl- terminated polyester oligomer. The hydroxyalkyl-terminated polyester oligomer is heated to produce a composition comprising an intermediate molecular weight polyester which preferably has a molecular weight between about 20,000 Daltons and about 70,000 Daltons. The intermediate molecular weight polyester is heated and a solvent is added prior to or during the heating process to produce a composition comprising a macrocyclic oligoester. An optional step is to separate the macrocyclic oligoester from the composition comprising the macrocyclic oligoester.
L'invention concerne des oligoesters macrocycliques et des compositions comprenant des oligoesters macrocycliques, qui sont préparés à partir de polyesters de poids moléculaire intermédiaire. Dans une forme de réalisation, un diol est placé au contact d'un acide dicarboxylique ou d'un dicarboxylate, en présence d'un catalyseur, afin de produire une composition contenant un oligomère de polyester à terminaison hydroxyalkyle. L'oligomère de polyester à terminaison hydroxyalkyle obtenu est chauffé pour produire une composition comprenant un polyester de poids moléculaire intermédiaire présentant, de préférence, un poids moléculaire compris entre environ 20.000 daltons et 70.000 daltons. Le polyester de poids moléculaire intermédiaire est chauffé et un solvant est ajouté avant ou pendant le processus de chauffage afin de produire une composition comprenant un oligoester macrocyclique. Une étape facultative consiste à séparer l'oligoester macrocyclique de la composition comprenant l'oligoester macrocyclique.
Cyclics Corporation
Smart & Biggar
LandOfFree
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