Method for preparing and polymerizing macrocyclic poly(alkylene discarboxylate) oligomers
AssigneeGeneral Electric Company
InventorsDaniel J. Brunelle, Jean E. Bradt
Life of this patent
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Abstract
Macrocyclic polyester oligomer compositions comprising alkylene isophthalate or terephthalate units or the like are prepared by the reaction of a diol with a diacid chloride in the presence of at least one amine characterized by substantially no steric hindrance around the basic nitrogen atom. The reaction is conducted under substantially anhydrous conditions and at a temperature form about -25.degree. to about +25.degree. C. The resulting macrocyclic oligomers may be converted to linear polyesters by contact with catalysts including alkali metal salicylates, stannous alkoxides and organotin compounds.
Claims15
A method for preparing a macrocyclic polyester oligomer composition comprising structural units of the formula ##STR4## wherein R is an alkylene or mono- or polyoxyalkylene radical containing a straight chain of about 2-8 atoms and A is an m-or p-linked monocyclic aromatic or alicyclic radical, which comprises contacting at least one diol of the formula HO--R--OH and at least one diacid chloride of the formula ##STR5## under substantially anhydrous conditions and in the presence of a substantially water-immiscible organic solvent, with at least one unhindered tertiary amine;
- said contact being conducted at a temperature from about -25.degree. to about +25.degree. C.
Dependencies are inferred from the claim text.