Patent ID: 6444780
Filing Date: 2002-09-03
Classification: C04B,C07C

Abstract:
A method of producing polyetherester monomer shown by Formula 3, said method comprising the step of causing an esterification reaction of polyalkyleneglycol with a closed end shown by Formula 1 and unsaturated carboxylic acid shown by Formula 2 by using an acid catalyst under a heated and reduced-pressure condition in the absence of solvents and in the presence of one selected from the group consisting of p-benzoquinone, phenothiazine and a mixture thereof in an amount of 0.03-0.5 weight % of said polyalkyleneglycol with a closed end while distilling away generated water, wherein said Formula 1, said Formula 2 and said Formula 3 are respectively: where R1 and R2 are each H or methyl group, R3 is one selected from the group consisting of alkyl groups with 1-22 carbon atoms, benzyl group, phenyl group and alkylphenyl groups each having alkyl group with 1-12 carbon atoms, and A is residual group produced by removing all hydroxyl groups from polyalkyleneglycol with repetition number of oxyalkylene units 5-250, said oxyalkylene units consisting either only of oxyethylene units or of both oxyethylene units and oxypropylene units.