Dyeable polyolefin compositions and dyeing polyolefin compositions
AssigneeLyondell Petrochemical Company
InventorsParesh J. Sheth, Venkatramana Chandrashekar, Roger R. Kolm
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Abstract
Disperse dyeable compositions of ethylene alkyl acrylate grafted onto polypropylene are provided. A process for disperse dyeing polypropylene fibers is provided. This process comprises (a) extruding the polypropylene with about 2 to 10% by weight of a thermoplastic copolymer of ethylene and alkyl acrylates having one to four carbon atoms in the alkyl group into fibers, and (b) exposing the fibers to a disperse dye bath containing a selected disperse dye.
Claims45
A process for dyeing fibers based on a polypropylene, comprising:
- (a) forming into a fiber a composition of about 98 to 70% by weight of a polypropylene and an ethylene copolymer comprising about 70 to 82% by weight ethylene and about 30 to 18% by weight of an alkyl acrylate wherein the alkyl has one to four carbon atoms;
- said alkyl acrylate present in the composition in an amount between 0.2 to 3.0% by weight of the sum of the polypropylene and ethylene copolymer;
- and the ethylene from said ethylene copolymer present in the composition in an amount less than about 10% by weight of the sum of the polypropylene and ethylene copolymer;
- (b) exposing the fiber to a disperse dye.
A process for dyeing fibers based on polypropylene comprising:
- (a) combining polypropylene with an ethylene copolymer of about 70 to 82% by weight ethylene and about 30 to 18% by weight of an ethylene alkyl acrylate wherein the alkyl group has one to four carbon atoms, to form a composition, said alkyl acrylate present in the composition in an amount between 0.2% to 3.0% by weight of the sum of the polypropylene and the ethylene copolymer;
- (b) grafting the ethylene copolymer onto the polypropylene to form a grafted composition;
- (c) extruding the grafted composition into fibers;
- and
- (d) exposing the fibers to a disperse dye sufficient to dye the fibers.
A colored polyolefin fiber comprising:
- (a) about 98 to 70% by weight of a polypropylene;
- (b) an ethylene copolymer comprising about 70 to 82% by weight ethylene and about 30 to 18% by weight of an alkyl acrylate wherein the alkyl acrylate has one to four carbon atoms, said alkyl acrylate being present in an amount between 0.2% to 3.0% by weight, wherein at least a portion of said copolymer is grafted onto said polypropylene;
- and
- (c) an effective amount of a disperse dye diffused therein sufficient to produce a colored fiber.
A colored polypropylene fiber comprising:
- (a) about 98 to 70% by weight of polypropylene;
- (b) a selected amount of an ethylene copolymer incorporated into the polypropylene, the ethylene copolymer comprising about 70 to 82 % by weight ethylene and about 30 to 18% by weight of methyl acrylate, said methyl acrylate present in an amount between 0.2 to 3.0% by weight;
- the ethylene from said ethylene copolymer is present in an amount less than about 10% by weight of the sum of the polypropylene and ethylene copolymer;
- and
- (c) an effective amount of a disperse dye diffused into the polypropylene to produce a colored fiber, the disperse dye selected from a group consisting of Blue 291, Blue 35, Blue 87, Blue 354, Yellow 54, Yellow 86, Yellow 3, Yellow 23, Yellow 232, Red 60, Yellow 64, Green 9, Blue 79, Red 73, Red 127, Red 167, Blue 183, Blue 118, Blue 60, Violet 28, Blue 77, Blue 361, and Intrawhite FWA.
Dependencies are inferred from the claim text.