Electro-chargeable fiber, nonwoven fabric and nonwoven product thereof

摘要

An electro-chargeable fiber includes a thermoplastic resin fiber having a nonionic fiber finish containing at least one major component selected from the group consisting of (a) at least one sorbitan fatty acid ester having formula (I) or formula (II) and (b) polyoxyalkylene alkyl ether having formula (III), wherein the nonionic fiber finish is present in an amount of 0.01-1.5% by weight of the thermoplastic resin fiber;;
wherein R1, R2, and R3 independently of one another represent a hydroxyl group, a polyoxyethylene group, or a polyoxypropylene group, the respective degree of polymerization (an ethylene oxide group or a propylene oxide group as a constitutional unit) independently of one another is from 0 to 55, and R4 represents a saturated or unsaturated aliphatic hydrocarbon group of 16-30 carbon atoms,
R5—OCH2CHR6OkH  formula (III)
wherein R5 represents a saturated or unsaturated aliphatic hydrocarbon group of 12-30 carbon atoms, R6 represents hydrogen or a methyl group, and k is an integer from 5 to 50.

主权项

1. A final product made of a nonwoven fabric comprising an electro-chargeable fiber comprising a thermoplastic resin fiber having a nonionic fiber finish containing at least one of (a) 50% or more, by weight of the fiber finish, of a sorbitan fatty acid ester having formula (I) or formula (II), and (b) 50% or more, by weight of the fiber finish, of a polyoxyalkylene alkyl ether having formula (III), wherein the nonionic fiber finish is present in an amount of 0.01-1.5% by weight of the thermoplastic resin fiber and the nonwoven fabric being made by an air-laid process; wherein R1, R2, and R3 independently of one another represent a hydroxyl group, a polyoxyethylene group, or a polyoxypropylene group, the respective degree of polymerization, with an ethylene oxide group or a propylene oxide group considered as a constitutional unit, independently of one another is from 0 to 55, and R4 represents a saturated or unsaturated aliphatic hydrocarbon group of 16-30 carbon atoms,
R5—OCH2CHR6OkH  formula (III) wherein R5 represents a saturated or unsaturated aliphatic hydrocarbon group of 12-30 carbon atoms, R6 represents hydrogen or a methyl group, and k is an integer from 5 to 50, the nonwoven fabric is made by the air-laid process, the nonwoven fabric having intersections of heat-adhered fibers or mechanically interlaced fibers, and is charged by electret-treatment, the electret-treatment is a heat electret treatment or a corona discharge treatment, where the electro-chargeable fiber has a fiber length of 3 to 40 mm.