Importance

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Abstract

It is an object of the present invention to provide a fiber-treatment capable of providing improved flame retardancy towards synthetic fiber comprising polyester. This invention provides a flame retardant for polyester-based synthetic fiber, comprising a polyester having a weight-average molecular weight of about 500 to about 20, 000, said polyester being obtained from (A) an aromatic dicarboxylic acid component having no anionic group other than the carboxylic groups, (B) a diol and (C) a phosphinic acid derivative represented by the formula: ##STR1## wherein R.sup.1 and R.sup.2 are independently selected from the group consisting of hydrogen atom and hydrocarbyl groups containing 1-22 carbon atoms, or R.sup.1 and R.sup.2 are joined into a divalent group to form a ring together with the phosphorus and oxygen atoms; n is 0, 1 or 2; and Z is a monovalent succinic residue represented by ##STR2## wherein R.sup.3 is a hydrogen atom or an alkyl group containing 1-4 carbon atoms; the molar ratio of the components (A)/(B)/(C) being 1/0.8-9/0.2-5.

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First Claim