Treating agent for elastic fibers and elastic fibers obtained by using the same

Finishes for elastic fiber containing 80 to 99.99 parts by weight of at least one base component selected from the group consisting of silicone oils, mineral oils and ester oils, 0.01 to 10 parts by weight of an amino-modified silicone and 0.0001 to 10 parts by weight of a phosphate ester containing an acidic hydroxyl group and at least one hydrocarbon group or oxyalkylene group per a molecule, wherein the phosphate ester is at least one member selected from the group consisting of:

• monomethyl phosphate, dimethyl phosphate, oleyl phosphate, 2-ethylhexyl phosphate, butyl phosphate, benzyl phosphate, octyiphenyl phosphate, cyclohexyl phosphate, POE (2) POP (5) phosphate, a phosphate having one to two alkyl groups having an average carbon number of 14, a phosphate having one to two alkyl groups having an average carbon number of 18, a phosphate having one to two alkyl groups which have an average carbon number of 16 and to which 15 moles of oxyethylene groups are added, a phosphate having one to two iso-alkyl groups having an average carbon number of 18, and a phosphate having one to two alkyl groups having an average carbon number of 6, wherein a mole ratio of an amino group contained in said amino-modified silicone to the acidic hydroxyl group contained in said phosphate ester ranges from 0.8 to 1.2.

Finishes for elastic fiber containing 80 to 99.99 parts by weight of at least one base component selected from the group consisting of silicone oils, mineral oils and ester oils, 0.01 to 10 parts by weight of an amino-modified silicone and 0.000 1 to 10 parts by weight of a phosphate ester containing at least one hydrocarbon group or oxyalkylene group per a molecule, wherein an amino group in the amino-modified silicone is neutralized with an acidic hydroxyl group in the phosphate ester, wherein a mole ratio of an amino group contained in said amino-modified silicone to an acidic hydroxyl group contained in said phosphate ester ranges from 0.8 to 1.2.

Finishes for elastic fiber containing 80 to 99.99 parts by weight of at least one base component selected from the group consisting of silicone oils, mineral oils and ester oils, 0.01 to 10 parts by weight of an amino-modified silicone, 0.0001 to 10 parts by weight of a phosphate ester containing an acidic hydroxyl group and at least one hydrocarbon group or oxyalkylene group per a molecule, and 0.01 to 15 parts by weight of at least one of polyether-modified silicones, carboxy-modified silicones, metallic soaps and silicone resins, wherein a mole ratio of an amino group contained in said amino-modified silicone to the acidic hydroxyl group contained in said phosphate ester ranges from 0.8 to 1.2.