Hydrophilic polyester fiber and hydrophilic nonwoven fabric using the same and their production
AssigneeToyo Boseki Kabushiki Kaisha
InventorsTadaaki Hamaguchi, Hiroshi Maruyama, Shigeki Tanaka, Hisao Nishinaka
Life of this patent
Estimating the term…
Abstract
A hydrophilic polyester fiber is supplied with an aqueous mixed dispersion on the surface and made hydrophilic by being heated at 35° C. or higher, and the aqueous mixed dispersion employed contains a polyester-polyether block copolymer composed of a polyester component and a polyether component and is stable at lower than 35° C. and precipitates the polyester-polyether block copolymer when its dispersion state is broken by being heated to 35° C. or higher.
Claims17
A hydrophilic polyester fiber comprising:
- a polyester fiber;
- and
- a coating on the fiber comprising (a) a polyester-polyether block copolymer comprising a polyester component and a polyether component;
- (b) an ion complex comprising (i) an anionic surfactant and (ii) a cationic surfactant;
- and (c) at least one of a nonionic surfactant and an amphoteric surfactant.
A hydrophilic polyester fiber comprising:
- a polyester fiber;
- and
- a precipitate from an aqueous mixed dispersion on the surface of the polyester fiber,
- wherein said aqueous mixed dispersion contains (a) a polyester-polyether block copolymer composed of a polyester component and a polyether component, (b) an anionic surfactant, (c) a cationic surfactant, and (d) at least one of a nonionic surfactant and an amphoteric surfactant,
- wherein, when heated to 35° C. or higher, said aqueous mixed dispersion produces an ion complex, and said block copolymer and said ion complex produced from at least said anionic surfactant and said cationic surfactant precipitate on the fiber surface, wherein said dispersion adheres to said polyester fiber, making said polyester fiber hydrophilic.
A method for producing a hydrophilic polyester fiber comprising steps of:
- applying an aqueous mixed dispersion to the surface of the fiber, wherein said aqueous mixed dispersion comprises (a) a polyester-polyether block copolymer composed of a polyester component and a polyether component, (b) an anionic surfactant, (c) a cationic surfactant, and (d) at least one of a nonionic surfactant and an amphoteric surfactant, wherein said aqueous mixed dispersion is stable at lower than 35° C.;
- and
- heating the fiber to 35° C. or higher, thereby forming an ion complex comprising said anionic surfactant and said cationic surfactant and precipitating said polyester-polyether block copolymer and said ion complex on the fiber surface, thereby producing a hydrophilic polyester fiber.
Dependencies are inferred from the claim text.