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A biodegradable hydrophilic binder fiber. These fibers may be produced by co-spinning a high-melting aliphatic polyester core material with a highly wettable aliphatic polyester blend. The highly wettable aliphatic polyester blend comprises an unreacted mixture of an aliphatic polyester polymer sele

A biodegradable hydrophilic binder fiber. These fibers may be produced by co-spinning a high-melting aliphatic polyester core material with a highly wettable aliphatic polyester blend. The highly wettable aliphatic polyester blend comprises an unreacted mixture of an aliphatic polyester polymer selected from the group consisting of a polybutylene succinate polymer, a polybutylene succinate-co-adipate polymer, a polycaprolactone polymer, a mixture of such polymers, or a copolymer of such polymers; a multicarboxylic acid; and a wetting agent. The biodegradable hydrophilic binder fiber exhibits substantial biodegradable properties, yet is easily processed. The biodegradable hydrophilic binder fiber may be used in a disposable absorbent product intended for the absorption of fluids such as body fluids.

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[ What is claimed is:] [1.] A bicomponent binder fiber comprising an aliphatic polyester core and an aliphatic polyester blend sheath, wherein the aliphatic polyester blend comprises:a. an aliphatic polyester polymer selected from the group consisting of a polybutylene succinate polymer, a polybutyl

[ What is claimed is:] [1.] A bicomponent binder fiber comprising an aliphatic polyester core and an aliphatic polyester blend sheath, wherein the aliphatic polyester blend comprises:a. an aliphatic polyester polymer selected from the group consisting of a polybutylene succinate polymer, a polybutylene succinate-co-adipate polymer, a polycaprolactone polymer, a mixture of such polymers, or a copolymer of such polymers, wherein the aliphatic polyester polymer exhibits a weight average molecular weight that is between about 10,000 to about 2,000,000, wherein the aliphatic polyester polymer is present in the aliphatic polyester blend in a weight amount that is between about 40 to less than 100 weight percent;b. a multicarboxylic acid having a total of carbon atoms that is less than about 30, wherein the multicarboxylic acid is present in the aliphatic polyester blend in a weight amount that is between greater than 0 weight percent to about 30 weight percent; andc. a wetting agent, which exhibits a hydrophilic-lipophilic balance ratio that is between about 10 to about 40, in a weight amount that is greater than 0 to about 25 weight percent, wherein all weight percents are based on the total weight amount of the aliphatic polyester polymer, the multicarboxylic acid, and the wetting agent present in the aliphatic polyester blend;wherein the aliphatic polyester blend exhibits an Apparent Viscosity value at a temperature of about 170.degree. C. and a shear rate of about 1000 seconds.sup.-1 that is between about 5 Pascal seconds and about 200 Pascal seconds.