WO2008070056A2 - Procédé de teinture d'un produit semi-fini - Google Patents

Procédé de teinture d'un produit semi-fini Download PDF

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Publication number
WO2008070056A2
WO2008070056A2 PCT/US2007/024802 US2007024802W WO2008070056A2 WO 2008070056 A2 WO2008070056 A2 WO 2008070056A2 US 2007024802 W US2007024802 W US 2007024802W WO 2008070056 A2 WO2008070056 A2 WO 2008070056A2
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Prior art keywords
dye
semi
finished product
percent
bath
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PCT/US2007/024802
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English (en)
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WO2008070056A3 (fr
Inventor
Robert A. Pyles
Rick L. Archey
David M. Derikart
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Bayer Materialscience Llc
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Publication of WO2008070056A2 publication Critical patent/WO2008070056A2/fr
Publication of WO2008070056A3 publication Critical patent/WO2008070056A3/fr

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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
    • D06P3/34—Material containing ester groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/06—Coating with compositions not containing macromolecular substances
    • C08J7/065—Low-molecular-weight organic substances, e.g. absorption of additives in the surface of the article
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
    • D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
    • D06P1/60—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing polyethers
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
    • D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
    • D06P1/60—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing polyethers
    • D06P1/613—Polyethers without nitrogen
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
    • D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
    • D06P1/60—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing polyethers
    • D06P1/613—Polyethers without nitrogen
    • D06P1/6131—Addition products of hydroxyl groups-containing compounds with oxiranes
    • D06P1/6133—Addition products of hydroxyl groups-containing compounds with oxiranes from araliphatic or aliphatic alcohols
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
    • D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
    • D06P1/60—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing polyethers
    • D06P1/613—Polyethers without nitrogen
    • D06P1/6131—Addition products of hydroxyl groups-containing compounds with oxiranes
    • D06P1/6135—Addition products of hydroxyl groups-containing compounds with oxiranes from aromatic alcohols or from phenols, naphthols
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
    • D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
    • D06P1/64—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing low-molecular-weight organic compounds without sulfate or sulfonate groups
    • D06P1/651—Compounds without nitrogen
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
    • D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
    • D06P1/64—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing low-molecular-weight organic compounds without sulfate or sulfonate groups
    • D06P1/651—Compounds without nitrogen
    • D06P1/65106—Oxygen-containing compounds
    • D06P1/65118—Compounds containing hydroxyl groups
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
    • D06P3/02—Material containing basic nitrogen
    • D06P3/04—Material containing basic nitrogen containing amide groups
    • D06P3/24—Polyamides; Polyurethanes
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
    • D06P3/79—Polyolefins
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form

Definitions

  • the present invention relates to a method of dyeing a semi-finished product.
  • the semi-finished product is immersed at least partially in a dye bath which includes one or more dyes, water, at least one carrier (e.g., ethyleneglycol butyl ether), and a diol (e.g., diethylene glycol).
  • a dye bath which includes one or more dyes, water, at least one carrier (e.g., ethyleneglycol butyl ether), and a diol (e.g., diethylene glycol).
  • Colored semi-finished products can be prepared by means of incorporating (e.g., by means of compounding) pigments and/or dyes directly into the polymeric materials from which the products are prepared.
  • Such direct incorporation methods result in the colorant being dispersed substantially throughout the semi-finished product .
  • Direct incorporation methods are not particularly well suited for the preparation of semi-finished products that are only slightly colored or tinted (e.g., less than opaque), such as in the case of sunshade lenses. It is typically difficult to adequately and sufficiently disperse the small amounts of colorant required to prepare slightly colored or tinted semi-finished products, by means of direct incorporation methods.
  • the preparation of the master-batch requires additional steps.
  • the resin of the master-batch will be exposed to at least two heat cycles (one during the preparation of the master-batch, and another during preparation of the dyed semi-finished product), which can result in a final semi-finished product having degraded physical properties.
  • the preparation of colored semi-finished products by means of applying a dye composition to the surface of the semi-finished product is generally known. Such dyeing methods are more suited to the preparation of slightly colored or tinted semi-finished products, as only small and controlled amounts of colorant are incorporated into the surface thereof.
  • the dye compositions may be aqueous or non-aqueous.
  • a method of dyeing a semi-finished product comprises:
  • thermoplastic polymer (a) providing a semi-finished product selected from the group consisting of powders, pellets and strands, that contain at least one thermoplastic polymer;
  • R 1 [O(CH 2 )n]mOR 2 where R 1 and R 2 independently one of the other denote H, Ci-i ⁇ -alkyI, benzyl, benzoyl or phenyl radicals which may be substituted in the aromatic ring by alkyl and/or halogen, n is 2 or 3 and m is 1 to 35, and
  • a diol selected from at least one of linear or branched C 2 -C 2 O aliphatic diols, poly(C 2 -C 4 alkylene glycol), cycloaliphatic diols having from 5 to 8 carbon atoms in the cyclic ring, monocyclic aromatic diols, bisphenols and hydrogenated bisphenols;
  • the dye bath used in the method of the present invention includes at least one carrier according to formula I, as described previously herein.
  • Linear or branched alkyls from which R of formula I may be selected include, but are not limited to, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl and octadecyl, and structural isomers thereof (e.g., iso-propyl, i-butyl, t-butyl, etc.).
  • R may also be selected from benzyl, benzoyl and phenyl groups, each of which may independently and optionally be substituted with 1 to 5 groups selected from halo groups
  • n is 2 and R is selected from n-butyl, i-butyl and t-butyl. In a particularly preferred embodiment of the present invention, n is 2, and R is n-butyl.
  • the carrier is typically present in the dye bath in an amount of less than or equal to 30 percent by weight, preferably less than or equal to 25 percent by weight, and more preferably less than or equal to 20 percent by weight.
  • the carrier is also typically present in the dye bath in an amount of at least 10 percent by weight, preferably at least 15 percent by weight, and more preferably at least 17 percent by weight.
  • the carrier may be present in the bath in an amount ranging between any combination of these upper and lower values, inclusive of the values thereof.
  • the carrier may be present in the dye bath in an amount typically from 10 to 30 percent by weight, more typically from 15 to 25 percent by weight, and further typically in an amount of from 17 to 20 percent by weight.
  • the percent weights being based on the total weight of the dye bath, in each case.
  • the dye bath also further includes a diol selected from at least one of linear or branched C 2 -C 20 aliphatic diols, PoIy(Ca-C 4 alkylene glycol), cycloaliphatic diols having from 5 to 8 carbon atoms in the cyclic ring, monocyclic aromatic diols, bisphenols and hydrogenated bisphenols.
  • a diol selected from at least one of linear or branched C 2 -C 20 aliphatic diols, PoIy(Ca-C 4 alkylene glycol), cycloaliphatic diols having from 5 to 8 carbon atoms in the cyclic ring, monocyclic aromatic diols, bisphenols and hydrogenated bisphenols.
  • linear or branched C 2 -C 20 aliphatic diols include, but are not limited to, ethylene glycol, propylene glycol, 1 ,3-propane diol, 1 ,2- and 2,3- butane diol, pentane diols, hexane diols, heptane diols, octane diols, nonane diols, decane diols, undecane diols, dodecane diols, tridecane diols, tetradecane diols, pentadecane diols, hexadecane diols, hetadecane diols, octadecane diols, nonadecane diols and icosane diols.
  • PoIy(C 2 -C 4 )alkylene glycols from which the diol (iv) may be selected include, but are not limited to, di-, tri-, tetra-, penta- and higher ethylene glycols, di-, tri-, tetra-, penta- and higher propylene glycols, and di-, tri-, tetra-, penta- and higher butylene glycols.
  • Cycloaliphatic diols having from 5 to 8 carbon atoms that may be used as diol (iv) include, but are not limited to, cyclopentane diol, cyclohexane diol, cyclohexane dimethanol, cycloheptane diol and cyclooctane diol.
  • Examples of monocyclic aromatic diols that may be used as diol (iv) include but are not limited to, benzene diol, e.g., 1 ,2-dihydroxy benzene and 1 ,3-dihydroxy benzene; Ci -C 4 alkyl substituted benzene diol, e.g., 4- tert-butyl-benzene-1 ,2-diol, 4-methyl-benzene-1 ,2-diol, 3-tert-butyl-5- methyl-benzene-1 ,2-diol and 3,4,5,6-tetramethyl-benzene-1 ,2-diol; halo substituted benzene diol, e.g., 3,5-dichlorobenzene-1 ,2-diol, 3,4,5,6- tetrabromo-benzene-1 ,2-diol and 3,4,5-trichloro-benzene-1 ,2-dio
  • Ci -C 4 alkyl e.g., methyl, ethyl, n-propyl, iso-propyl, n-butyl,
  • An example of a bisphenol that may be used as diol (iv) is 4,4'-isopropylidenebisphenol (i.e., bisphenol A).
  • An example of a hydrogenated bisphenol that may be used as diol (iv) is 4,4'-isopropylidenebiscyclohexanol.
  • diol (iv) is a poly(C-2-C 4 alkylene glycol) selected from diethylene glycol, triethylene glycol, tetraethylene glycol, pentaethylene glycol and mixtures thereof. Particularly preferred diols are ethylene glycol and diethylene glycol.
  • the diol is typically present in the dye bath in an amount of less than or equal to 20 percent by weight, preferably less than or equal to 15 percent by weight, and more preferably less than or equal to 12 percent by weight.
  • the diol is also typically present in the dye bath in an amount of at least 1 percent by weight, preferably at least 5 percent by weight, and more preferably at least 10 percent by weight.
  • the diol may be present in the bath in an amount ranging between any combination of these upper and lower values, inclusive of the values thereof.
  • the diol may be present in the dye bath in an amount typically from 1 to 20 percent by weight, more typically from 5 to 15 percent by weight, and further typically in an amount of from 10 to 12 percent by weight. The percent weights being based on the total weight of the dye bath, in each case.
  • the dye that is present in the dye bath may be selected from static dyes, photochromic dyes and combinations thereof.
  • static dyes means a dye that does not substantially change color upon exposure to (or being shielded from) ultraviolet (UV) light.
  • photochromic dyes as used herein and the claims means dyes that reversibly change color upon exposure to UV light, as is known to the skilled artisan.
  • a photochromic dye upon exposure to a particular wavelength of UV light, a photochromic dye will be converted into an open or activated form which is colored (within a particular portion of the visible spectrum).
  • the open / activated photochromic dye Upon removal of the UV light source, the open / activated photochromic dye returns to a closed / inactivated from which is not colored, or which is at least less colored than the activated form.
  • Static dyes that may be included in the dye bath include, for example, fabric dyes and disperse dyes as well as dyes that are known in the art as being suitable for tinting semi-finished products, such as thermoplastic polycarbonate articles.
  • suitable disperse dyes include, but are not limited to, Disperse Blue #3, Disperse Blue #14, Disperse Yellow #3, Disperse Red #13 and Disperse Red #17.
  • the classification and designation of the static dyes are recited herein in accordance with "The Colour Index", 3 rd edition published jointly by the Society of Dyes and Colors and the American Association of Textile Chemists and Colorists (1971), which is incorporated herein by reference.
  • Dyestuffs can generally be used either as a sole dye constituent or as a component of a dye mixture depending upon the color desired.
  • the term static dye as used herein includes mixtures of static dyes.
  • Direct Dyes The static dye class known as Direct Dyes is useful in the practice of the present invention.
  • Direct Dye examples include, but are not limited to, Solvent Blue 35, Solvent Green 3 and Acridine Orange Base. However, it has been observed that Direct Dyes, typically do not color (tint/dye) the semi-finished product as intensely as do Disperse Dyes (which have been described previously herein).
  • Further suitable static dyes include, for example, water-insoluble azo, diphenylamine and anthraquinone compounds. Especially suitable examples include acetate dyes, dispersed acetate dyes, dispersion dyes and dispersol dyes, such as are disclosed in Colour Index, 3 rd edition, vol. 2, The Society of Dyers and Colourists, 1971 , pp.
  • Preferred dispersed dyes include Dystar's Palanil Blue E-R150 (anthraquinone/ Disperse Blue) and DIANIX Orange E-3RN (azo dye/ Cl Disperse Orange 25). It has been observed that phenol red and 4-phenylazophenol do not provide a desirable level of dying when the semi-finished product is thermoplastic polycarbonate, in the present process.
  • Static dyes known as direct dyes and those referred to as acid dyes have been observed to provide a less than desirable level of tinting when the semi-finished product contains thermoplastic polycarbonate, in the practice of the present invention.
  • acid dyes have been observed to be effective with nylon.
  • non-migratory static dyes i.e., static dyes that have been chemically modified to minimize or eliminate their migration out of semi-finished products into which they have been incorporated.
  • non-migratory static dyes i.e., static dyes that have been chemically modified to minimize or eliminate their migration out of semi-finished products into which they have been incorporated.
  • a particular class of non-migratory static dyes may be represented by the following formula III,
  • R 5 represents an organic dyestuff radical (or chromophore radical); the polymeric constituent is selected independently for each (t) from homopolymers, copolymers and block-copolymers of poly(C 2 -C 4 alkylene oxides), e.g., homopolymers of polyethylene oxide and polypropylene oxide, poly(ethylene oxide - propylene oxide) copolymers, and di- or higher block copolymers of ethylene oxide and propylene oxide; (t) may be an integer from 1 to 6; and (Y) is selected independently for each (t) from hydroxyl, primary amine, secondary amine and thiol groups.
  • the polymeric constituent may have a molecular weight of from, for example, 44 to 1500.
  • Dyestuff radicals from which (Y) may be selected include, but are not limited to, nitroso, nitro, azo (e.g., monoazo, diazo and triazo), diarylmethane, triarylmethane, xanthene, acridene, methine, thiazole, indamine, azine, oxazine and anthraquinone dyestuff radicals.
  • Non-migratory static dyes represented by formula III are described in further detail in United States Patent No.'s: 4,284,729; 4,640,690; and 4,812,141.
  • Non-migratory static dyes have been found to be useful when dyeing semi-finished products by means of imbibition or diffusion in accordance with the method of the present invention (e.g., by dipping). When incorporated into the semi-finished product by means of imbibition, excess non-migratory static dye can be washed off of the semi-finished product, with a minimum of imbibed non-migratory static dye being leached from the semi-finished product.
  • Non-migratory static dyes e.g., as represented by formula III
  • Photochromic dyes that may be used in the present method include those known to the skilled artisan.
  • Classes of suitable photochromic dyes include, but are not limited to: spiro(indoline)naphthoxazines and spiro(indoline)benoxazines (e.g., as described in United States Patent No. 4,818,096); and chromenes, such as benzopyrans and naphthopyrans (e.g., as described in United States Patent No.
  • photochromic dyes include, for example, fulgides and fulgimides, such as 3-furyl and 3-thienyl fulgides and fulgimides (e.g., as described in United States Patent No. 4,931 ,220). The pertinent disclosures of the cited patents with regard to photochromic dyes is incorporated herein by reference.
  • Photochromic dyes or mixtures thereof may be used alone or in combination with one or more static dyes in the method of the present invention.
  • the imbibition of photochromic dyes into the semifinished products, such that contain thermoplastic polycarbonate articles results in a dyed semi-finished product that does not readily change color upon exposure to or shielding from UV light.
  • the photochromic dyes become trapped in either an open or closed form within the thermoplastic polymer matrix.
  • softer, more rubbery polymers such as polyurethanes are very suitable matrices for photochromic dyes to readily transition between the dark and light states.
  • the amount of dye present in the dye bath may vary widely. Typically the dye is present in the dye bath in an amount sufficient to result in the formation of a dyed semi-finished product having a colored effect and/or a photochromic effect that is discernible to the naked eye, e.g., upon exposure to UV light in the case of photochromic dyes.
  • the amount of dye that is actually present in the dye bath will depend on the solubility of the dye within the mixture of water, carrier and diol. The solubility of the dye within the bath will also be affected by the temperature of the bath. In those instances where the dye is not fully soluble in the bath, the dye bath is deemed to contain a saturated level of dye.
  • the level of dye in the bath can be maintained at the saturation level during dyeing operations.
  • the level (e.g., the saturation level) of dye in the bath can be determined periodically or continuously by, for example, thermogravimetric analysis or spectrophotometric analysis.
  • the dye is present in the dye bath in an amount of less than or equal to 15 percent by weight, more typically less than or equal to 5 percent by weight, further typically less than equal to 1 percent by weight, and still further typically less than 0.5 percent by weight.
  • the dye is also typically present in the dye bath in an amount of at least 0.001 percent by weight, preferably at least 0.005 percent by weight, and more preferably at least 0.01 percent by weight.
  • the dye may be present in the bath in an amount ranging between any combination of these upper and lower values, inclusive of the values thereof.
  • the dye may be present in the dye bath in an amount typically from 0.001 to 15 percent by weight, more typically from 0.005 to 5 percent by weight, further typically in an amount of from 0.01 to 1 percent by weight, and still further typically in an amount of from 0.01 to 0.5 percent by weight.
  • the dye is present in the dye bath in an amount of 0.03 percent by weight. The percent weights being based on the total weight of the dye bath, in each case.
  • the dye bath contains: 0.001 to 0.5 percent by weight of said dye; 65 to 75 percent by weight of water; 15 to 25 percent by weight of said carrier; and 1 to 15 percent by weight of said diol.
  • the percent weights being based, in each case, on the total weight of the dye bath.
  • Water is typically present in the dye bath in an amount of less than or equal to 85 percent by weight, preferably less than or equal to 80 percent by weight, and more preferably less than or equal to 75 percent by weight. Water is also typically present in the dye bath in an amount of at least 50 or 51 percent by weight, preferably at least 60 percent by weight, and more preferably at least 65 percent by weight. Water may be present in the bath in an amount ranging between any combination of these upper and lower values, inclusive of the values thereof. For example, water may be present in the dye bath in an amount typically from 50 (or 51 ) to 85 percent by weight, more typically from 60 to 87 percent by weight, and further typically in an amount of from 65 to 75 percent by weight. The percent weights being based on the total weight of the dye bath, in each case.
  • the water used is preferably deionized water or distilled water.
  • the dye bath further includes a surfactant (or emulsifier), which is different from each of the carrier and the diol. Suitable surfactants in the present invention are readily dispersible upon being poured into water, and then form a milky emulsion upon agitation thereof.
  • the surfactant may be selected from at least one of: anionic surfactants; amphoteric surfactants; and a non-ionic surfactant selected from at least one of poly(C 2 -C 4 alkoxylated) Ci 4 -Ci 8 unsaturated fatty acids, PoIy(C 2 -C 4 alkoxylated) phenol and poly(C 2 -C 4 alkoxylated) d-C 9 alkyl substituted phenol.
  • anionic surfactants that may be used in the present invention include, for example, amine salts or alkali salts of carboxylic, sulfamic or phosphoric acids, for example sodium lauryl sulfate, ammonium lauryl sulfate, lignosulfonic acid salts, ethylene diamine tetra acetic acid (EDTA) sodium salts and acid salts of amines such as laurylamine hydrochloride or poly(oxy-1 ,2-ethanediyl), alpha.
  • amine salts or alkali salts of carboxylic, sulfamic or phosphoric acids for example sodium lauryl sulfate, ammonium lauryl sulfate, lignosulfonic acid salts, ethylene diamine tetra acetic acid (EDTA) sodium salts and acid salts of amines such as laurylamine hydrochloride or poly(oxy-1 ,2-ethanediyl), alpha.
  • Amphoteric surfactants that may be present in the dye bath include, for example: lauryl sulfobetaine; dihydroxy ethylalkyl betaine; amido betaine based on coconut acids; disodium N-lauryl amino propionate; or the sodium salts of dicarboxylic acid coconut derivatives.
  • Examples of poly(C- 2 -C 4 alkoxylated) Ci 4 -Ci 8 unsaturated fatty acids include, ethoxylated, propoxylated and/or butoxylated tetradecenyl carboxylic acid.
  • Examples of poly(C 2 -C 4 alkoxylated) phenols include ethoxylated, propoxylated and/or butoxylated phenol.
  • Examples of PoIy(C 2 -C 4 alkoxylated) C r C 9 alkyl substituted phenols include, octylphenoxypolyethyleneoxyethanol and poly(oxy-1 ,2-ethanediyl), alpha- phenyl-omega-hydroxy, styrenated.
  • the optional surfactant may be used in an amount less than or equal to 5 percent by weight.
  • the optional surfactant is present in the dye bath in an amount of 0.5 to 5 percent by weight, and more preferably in an amount of 1 to 4 percent by weight.
  • the percent weights, in each case, being based on the weight of the dye bath.
  • the dye bath may further optionally include a performance enhancing additive selected from at least one of UV stabilizers, optical brighteners, mold release agents, antistatic agents, thermal stabilizers, IR absorbers and antimicrobial agents (substances or compounds). Inclusion of one or more of these optional performance enhancing additives in the dye bath serves to improve the physical performance / properties of the dyed semi-finished product.
  • the optional additives also diffuse, impregnate or otherwise are imbibed into the bulk of the semifinished product while it is immersed in the dye bath.
  • the optional additives include UV stabilizers in the dye bath results in a dyed semi-finished product having improved UV resistance. Mold release agents would be more advantageously included in the dye bath when the semi-finished product is selected from thermoplastic pellets, thermoplastic strands, or thermoplastic powders from which a finished product would later be prepared, as will be discussed further herein.
  • the optional performance enhancing additives may be selected from those that are known for use in preparing thermoplastic molded articles.
  • Classes of UV (ultraviolet) stabilizers (or absorbers) that may be used in the dye bath of the present invention include, but are not limited to salicylic acid UV absorbers, benzophenone UV absorbers, benzotriazole UV absorbers, cyanoacrylate UV absorbers, and mixtures thereof.
  • benzotriazole UV absorbers include but are not limited to: 2-(2'-hydroxy-5'methylphenyl)-benzotriazole (commercially available as Tinuvin ® P from Ciba, Tarrytown, N.Y.); 2-(3'-5'-di-tert-butyl-2'- hydroxyphenyl)-5-chlorobenzotriazole (commercially available as Tinuvin ® 327 from Ciba); 2(2'-hydroxy-3 1 -5 l -di-tert-amylphenyl)benzotriazole (commercially available as Tinuvin ® 328 from Ciba); benzenepropanoic acid, 3-(2H-benzotriazol-2-yl)-5-(1 ,1 -dimethyl ethyl)-4-hydroxy-, C 7 - 9 branched alkyl esters (commercially available as Tinuvin ® 384 from Ciba); 2-(3',5'-bis(1 -
  • UV stabilizers include, but are not limited to: p- methoxycinnamic acid 2-ethylhexyl ester stabilized with butylated hydroxy toluene (hereinafter "BHT") (commercially available as Uvinul MC 80 from BASF of Mount Olive, N.J.); p-methoxycinnamic acid 2-ethylhexyl ester unstabilized (commercially available as Uvinul MC 80 N from BASF); 2- cyano-3,3-diphenylacrylic acid 2'-ethylhexyl ester (commercially available as Uvinul 539 T from BASF); 2-hydroxy-4-(N-octoxy) benzophenone (commercially available as Cyasorb UV-501 from Cytec of West Paterson, NJ.
  • BHT butylated hydroxy toluene
  • UV stabilizers that may be used in the method of the present invention include those modified with at least one poly(oxyalkylene) chain.
  • Such poly(oxyalkylene) chain modified UV stabilizers are characterized in having low migratory properties once imbibed (or diffused) into the semi-finished product (e.g., they are not easily leached out of the semi-finished product into which they have been imbibed).
  • the poly(oxyalkylene) chain may be a homopolymer, copolymer or block-copolymer formed from the reaction of C2-C20 alkylene oxides (e.g., ethylene oxide, propylene oxide and butylene oxide).
  • the poly(oxyalkylene) group may be terminated with a hydroxyl group, a C1-C20 alkyl ether group, or a C1-C20 ester group.
  • Poly(oxyalkylene) chain modified UV stabilizers are described, for example, in further detail in United States Patent No. 6,602,447 B2.
  • Optical brighteners that may be included in the dye bath in the method of the present invention typically absorb a light wavelength of 450 nm or less and emit the light at a higher wavelength, such as a wavelength of 550 nm or less, preferably 525 nm or less. It is preferred that the emitted light be in the blue region of the visible spectrum (e.g., emitted light having a wavelength of at least about 400 nm and up to about 525 nm. Most preferably, the light emitted is no more than about 500 nm.
  • Classes of optical brighteners that may be used in the present invention include, but are not limited to benzoxazole derivatives and stilbene derivatives.
  • benzoxazole derivatives examples include, but are not limited to: 2,2'-(2,5-thiophenediyl) bis [5-tert-butylbenzoxazole] (commercially available as Uvitex ® OB from Ciba); benzoxazole derivatives such as Blankophor ® KLA (from Bayer of Pittsburgh, Pa.); Hostalux ® KCB (from Clariant of Muttenz, Switzerland); and Hostalux ® KCU (from Clariant).
  • An example of a commercially available stilbene derivative is 4,4'-bis(2- benzoxazolyl) stilbene (commercially available as Eastobrite ® OB-1 from Eastman of Kingsport, Tenn.).
  • Classes of mold release agents that may be included in the dye bath include, but are not limited to hydrocarbon-based mold release agents, fatty acid-based release agents, fatty acid amide-based mold release agents, alcohol-based mold release agents, fatty acid ester-based mold release agents, silicone-based mold release agents, and mixtures or combinations thereof.
  • hydrocarbon-based mold release agents include, synthetic paraffins, polyethylene waxes and fluorocarbons.
  • Fatty acid-based release agents that may be used include, for example, stearic acid and hydroxystearic acid.
  • Fatty acid amide-based mold release agents that may be used include, for example, stearic acid amide, ethylenebisstearoamide and alkylenebis fatty acid amides.
  • alcohol-based mold release agents examples include, stearyl alcohol, cetyl alcohol, and polyhydric alcohols such as polyglycols and polyglycerols.
  • polyhydric alcohols such as polyglycols and polyglycerols.
  • An example of a fatty acid ester-based mold release agent that may be included in the dye is butyl stearate.
  • Antistatic agents that may be included in the dye bath in the method of the present invention include, but are not limited to non-ionic antistatic agents, such as those containing fluorocarbon groups, and silicone oils, such as BAYSILONE 01 A (commercially available from Bayer AG, Germany). Further examples of antistatic agents that may be used in the present invention include, distearylhydroxylamine, triphenyl amine, tri-n- octylphosphine oxide, triphenyl phosphine oxide, pyridine N-oxide and ethoxylated sorbitan monolaurate.
  • Classes of thermal (or heat-resistant) stabilizers that may be included in the dye bath of the method of the present invention include, but are not limited to, phenol stabilizers, organic thioether stabilizers, organic phosphide stabilizers, hindered amine stabilizers, epoxy stabilizers and mixtures thereof.
  • thermal stabilizers include, but are not limited to, 2,6-di-t-butyl-p-cresol, o-t-butyl-p-cresol, tetrakis- (methylene-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate)methane, ⁇ - naphtylamine, p-phenylenediamine, and thiodiethylene bis(3,5-di-tert- butyl)-4-hydroxyhydrocinnamate, which is commercially available from Ciba Specialty Chemical under the tradename IRGANOX 1035 thermal stabilizer.
  • Infra red (IR) absorbers that may be used in the method of the invention include dyes that absorb in the IR region of the spectrum. Examples of commercially available IR absorbers include, CYASORB IR- 99, IR-126 and IR-165, which are available from Glendale Protective Technologies, Inc., Lakeland, FIa.
  • Antimicrobial agents that may be included in the dye bath in the method of the present invention include, for example, substances having antimicrobial activity towards microorganisms, such as pathogenic microorganisms.
  • the term "antimicrobial agents" as used herein and in the claims is also inclusive of antiseptic, disinfectant and antifungal substances.
  • the antimicrobial agents may also be used in a pre-activated form, e.g., in a form that does not become antimicrobially active until the occurrence of a triggering event, such as action of a microbe on the pre-activated substance.
  • antimicrobial agents examples include, but are not limited to: quinolones, such as nalidixic acid, pipemidic acid, cinoxacin, ciprofloxacin, norfloxacin, ofloxacin, pefloxacin and enoxacin; aminoglycosides, such as gentamycin, kanamycin, amikacin, sisomycin, tobramycin and netilmicin; macrolides, such as erythromycin, clarithromycin and azithromycin; polypeptides, such as bacitracin, mupirocin, thyrothricin, gramicidin and tyrocidin; lincomycins, such as lincomycin and clindamycin; and antimycobacterial agents, such as rifampicin and fusidic acid.
  • quinolones such as nalidixic acid, pipemidic acid, cinoxacin, ciprofloxacin, norfloxacin,
  • antimicrobial agents that may be used in the dye bath include: 10,10'-oxybisphenoxy arsine; 2-n-octyl-4-isothiazolin-3-one; 2,4,4'-trichloro-2'-hydroxy diphenyl ether (also named 5-chloro-2-(2,4-dichlorophenoxy)phenol, and commonly referred to as Triclosan); N-butyl-1 ,2-benzisothiazolin-3-one; and N- (trichloromethylthio)phthalamide.
  • 10,10'-oxybisphenoxy arsine 2-n-octyl-4-isothiazolin-3-one
  • 2,4,4'-trichloro-2'-hydroxy diphenyl ether also named 5-chloro-2-(2,4-dichlorophenoxy)phenol, and commonly referred to as Triclosan
  • N-butyl-1 ,2-benzisothiazolin-3-one and N- (trichloromethylthio)phthalamide.
  • the performance enhancing additives if used are typically present in the dye bath in a positive amount totaling less than or equal to 15 percent by weight, preferably less than or equal to 5 percent by weight, and more preferably less than or equal to 1 percent by weight.
  • the performance enhancing additives are also typically present in the dye bath in an amount totaling at least 0.001 percent by weight, preferably at least 0.005 percent by weight, and more preferably at least 0.01 percent by weight.
  • the performance enhancing additives may be present in the bath in a total amount ranging between any combination of these upper and lower values, inclusive of the recited values thereof.
  • the performance enhancing additives may be present in the dye bath in an amount typically totaling from 0.001 to 15 percent by weight, more typically from 0.005 to 5 percent by weight, and further typically in an amount of from 0.01 to 1 percent by weight.
  • the percent weights being based on the total weight of the dye bath, in each case.
  • the method of the present invention involves dyeing a semifinished product.
  • the semi-finished product in the context of the present invention is defined as an intermediate thermoplastic product selected from the group consisting of pellets, strands and powders calculated to be further processed (reshaped) to form a finished product. These terms are well known to the art skilled.
  • thermoplastic material suitable for the inventive method is a thermoplastic material system that contains at least one member selected from the group consisting of (co)polyesters, (co)polycarbonates, polyesterpolycarbonate copolymers, acrylonitrile- butadiene-styrene (ABS) copolymers, polyamides, polyurethanes, polyalkyl(meth)acrylate (e.g., polymethylmethacrylate) and styrene copolymers (e.g., styrene acrylonitrile copolymers).
  • the (co)polyesters, (co)polycarbonates, polyesterpolycarbonate copolymers may be aliphatic or aromatic polymers (e.g., containing residues of bisphenol A).
  • thermoplastic means a polymer that has a softening or melting point, and is substantially free of a three dimensional crosslinked network resulting from the formation of covalent bonds between chemically reactive groups, e.g., active hydrogen groups and free isocyanate groups.
  • the semi-finished product may contain additives that are known to the skilled artisan.
  • additives include, but are not limited to: mold release agents; fillers; reinforcing agents in the form of fibers or flakes (e.g., metal flakes such as aluminum flakes); flame retardant agents; pigments; and opacifying agents, such as titanium dioxide; light-diffusing agents, such as polytetrafluoroethylene, zinc oxide, Paraloid EXL-5136 available from Rohm and Haas and crosslinked polymethylmethacrylate microspheres (such as n-licrospheres from Nagase America); UV- stabilizers; hydrolytic stabilizers; thermal stabilizers; and antimicrobial agents.
  • the semi-finished product contains at least one of pigments, crosslinked polymethylmethacrylate microspheres, glass microspheres and metal flakes.
  • the semi-finished product may be prepared by art-recognized methods, such as extrusion - for making strands, and chopping of strands to make pellets .
  • Powders in the context of the invention may be prepared by solution spray drying or by precipitation of their polymeric solution or melt. The powders are sometimes characterized by the largest dimension of their particles that may range up to about 1000 microns.
  • the semi-finished product is selected from powders, pellets and strands.
  • Thermoplastic pellets and strands may be made by art-recognized methods, such as extrusion or melt-spinning.
  • the thermoplastic pellets and/or strands are dyed, and then may be further processed.
  • the dyed thermoplastic pellets and/or strands are melted (e.g., in an extruder) to form a molten dyed thermoplastic composition, and then the molten dyed thermoplastic composition is introduced (e.g., injected) into a mold.
  • the contents of the mold are allowed to cool, the mold is opened, and a dyed shaped finished product is removed therefrom.
  • This method of further processing dyed semi finished products is favorably differentiated from the direct incorporation methods described previously herein.
  • the dye With dyed thermoplastic pellets and/or strands, the dye is already present within the thermoplastic polymer (rather than being added to the polymer separately), which allows for more control and reliability with regard to the desired and reproducible level of tinting.
  • the semi-finished product to be tinted is immersed in the dye bath for a period of time and at temperature at least sufficient to facilitate at least some impregnation (diffusion or imbibition), of the dye into the bulk of the semi-finished product thus effecting dyeing (or tinting) thereof.
  • the time and temperature employed typically depends on the composition of the semifinished product . Immersion times are typically less than or equal to 8 hours, more typically less than or equal to 4 hours, and even more typically less than or equal to 1 hour. Immersion times are also typically at least 5 seconds, more typically at least 30 seconds, and even more typically at least 1 minute.
  • the immersion time may range between any of these upper and lower values, inclusive of the recited values. In an embodiment of the present invention, the immersion time is typically from 5 seconds to 8 hours, more typically from 15 or 30 seconds to 4 hours, and further typically from 1 minute to 1 hour (e.g., 1 to 15 minutes).
  • the temperature of the dye bath during immersion of the semifinished product is typically at least room temperature (e.g., 25°C) and less than the boiling and/or decomposition temperature of the dye bath.
  • the dye bath is maintained at a temperature of 25°C to 99°C, for example from 60°C to 97°C or from 7O 0 C to 95°C.
  • the time and temperature of immersion will depend at least in part on the type of semi-finished product that is to be dyed. For example, with semi-finished products of thermoplastic aromatic polycarbonate, dyeing may be efficiently carried out at a temperature of 90 to 99 0 C, with an immersion time of typically less than 1 hour, and more typically in the range of 1 to 15 minutes.
  • the tinted (or dyed) semi-finished product is then withdrawn from the dye bath.
  • the dye bath may be prepared by mixing the dye, water, carrier, diol, optional surfactants and optional performance enhancing additives together in any order.
  • the carrier and diol may be mixed together with the dye, and then this mixture is either added to water or water is added to it.
  • the dye bath is formed by: (i) preparing a mixture of water, carrier and diol: (ii) introducing the dye into a filter; and (iii) passing the mixture over the dye and through the filter, thereby forming the dye bath.
  • the dye bath, or at least a portion thereof, is then typically passed continuously through the filter.
  • the mixture of water, carrier and diol may be heated, e.g., heated to a temperature of 25°C to 99°C, or 60°C to 97°C, or 70°C to 95°C, and then the heated mixture is contacted with the dye in the filter.
  • the filter into which the dye is added may be any suitable filter known to the skilled artisan.
  • a preferred type of filter is a bag filter. Preparing and maintaining the dye bath in this manner, ensures that the level of dye in the bath is maintained substantially at a saturation level (as discussed previously herein).
  • passing the dye bath continuously through the bag filter serves to remove particulate contaminants therefrom (e.g., unsolubilized dye particles), which could foul the dyed semi-finished products prepared by immersion in the dye bath.
  • the dye bath is continuously introduced into and withdrawn from an immersion tank (or vessel).
  • the immersion tank is part of a circuit which includes an inlet that is in fluid communication (via an inlet conduit) with a pump, which is in fluid communication with an outlet from the tank via an outlet conduit.
  • the circuit may optionally include at least one filter, e.g., a bag filter as described previously herein, located inline with the inlet and/or outlet conduits.
  • the inlet and outlet of the immersion tank are positioned below the liquid level of the dye bath within the tank.
  • the immersion tank inlet may include a plate having a plurality of perforations (e.g., a diffuser or diffuser plate). Continuously introducing the dye bath into the immersion tank by passage through a plate having a plurality of perforations increases the level of turbulent mixing within the immersion tank, and improves the efficiency and uniformity of dyeing of semi-finished products immersed therein.
  • the perforations in the diffuser plate may have any suitable shape, e.g., circular, ellipsoid, polygonal or combinations thereof.
  • the perforations of the diffuser plate typically have diameters of from 0.79 mm to 12.70 mm, e.g., from 3.17 mm to 6.35 mm.
  • the diffuser plate may have any suitable configuration, e.g., it may be flat, concave or convex.
  • the scope of the method of the present invention is inclusive of additional steps whereby the composition of the dye bath is modified, e.g., such that an initial dye or dyes may be substituted with a subsequent dye or dyes.
  • the dye and optional performance enhancing additives are separated from the other components of the dye bath (e.g., the water, carrier, diol and optional surfactants).
  • Such a separation is environmentally favorable in that it allows for re-use of the non-dye components of the bath, for example with another dye or dyes, or with a fresh dye(s), or as a rinse composition for rinsing dyed semi-finished products removed from the dye bath.
  • the dye separation method may be performed if the dye of the dye bath has been damaged, such as oxidized or otherwise denatured (e.g., due to over heating due to a temperature spike).
  • the dye separation process may be performed by contacting the dye bath with particulate activated carbon, and then isolating a substantially dye-free liquid therefrom containing water, carrier, diol and optional surfactants in substantially the same relative proportions as prior to the separation step.
  • the dye-free liquid may then be mixed with another dye(s) to form a different dye bath.
  • the dye bath may be contacted with the activated carbon by passing the dye bath continuously through a bed or column containing activated carbon.
  • the activated carbon typically retains substantially all of the dye of the dye bath, and preferably less than a minimal amount of the organic liquid components of the dye bath (e.g., carrier, diol and optional surfactants).
  • the method further involves a dye separation process that includes:
  • the dye bath may be contacted with the particulate activated carbon by passing the dye bath through a bed or a column containing the particulate activated carbon.
  • the dye-free liquid that is isolated in the dye separation process is substantially free of dye, e.g., containing an undetectable amount of dye as determined by means of spectrophotometric analysis.
  • the particulate activated carbon typically has a 200 mesh particle size (e.g., a particle size of 0.075 mm).
  • An example of a commercially available particulate activated carbon that may be used in the present invention is Filtrasorb 200 activated carbon from Calgon Carbon Corporation.
  • the amount of activated carbon that is required to effect dye separation is dependent in part on the temperature of the dye bath. In general, the amount of activated carbon required to effect dye separation is: reduced as the temperature of the dye bath is reduce; and increased as the temperature of the dye bath is increased. In an embodiment of the present invention, the dye bath is contacted with the activated carbon at a temperature of 25°C.
  • the dye(s) optionally added to the dye-free liquid may be selected from static dyes, photochromic dyes, and combinations thereof.
  • the static dyes and photochromic dyes that may be added include those classes and examples described previously herein.
  • the dye added to the dye-free liquid may be of the same type as the dye that was removed from the dye bath, in which case the further dye bath is a fresh or refreshed dye bath.
  • the dye added to the dye-free liquid may be different than the dye that was removed from the dye bath, in which case the further dye bath is a new or different dye bath.
  • the dye separation process may further include adding additional materials to the dye-free liquid and/or the further dye bath.
  • Such other additional materials include, for example, surfactants and/or performance enhancing additives, which may each be selected from those classes and examples as described previously herein.
  • the dyed semi-finished product is typically rinsed to remove excess dye bath material there from.
  • the rinsing step is typically achieved by contacting at least a portion of the surface of the dyed article with a rinse composition comprising water, and optionally a carrier represented by formula I, and/or a diol.
  • the water of the rinse composition may be deionized or distilled water.
  • the carrier and diol that may be present in the rinse composition are as described previously herein with reference to the dye bath, and may each be selected from those classes and examples as recited previously herein.
  • the carrier is ethyleneglycol mono-butyl ether
  • the diol is diethylene glycol
  • the rinse composition is composed of water, a carrier represented by formula I and a diol (as described previously herein with reference to diol (iv) of the dye bath).
  • the rinse composition may be contacted with the surface of the dyed semi-finished product by means of, for example, immersion (dipping), spray application and/or curtain application.
  • the rinse composition may be recycled and used to rinse additional dyed articles. After a number of rinse cycles, dye will typically accumulate in the recycled rinse composition. Accumulated dye may be removed from the recycled rinse composition by contacting the recycled rinse composition with particulate activated carbon, as described previously herein with regard to the dye separation process.
  • the rinse composition typically contains water in an amount typically from 50 (or 51) to 100 percent by weight, more typically from 60 to 87 percent by weight, and further typically in an amount of from 65 to 75 percent by weight. The percent weights being based on the total weight of the rinse composition, in each case.
  • the amounts of carrier and/or diol that may be present in the rinse composition may be selected from those ranges and amounts as recited previously herein with regard to the dye bath.
  • the carrier may be present in the rinse composition in an amount typically from 10 to 30 percent by weight, more typically from 15 to 25 percent by weight, and further typically in an amount of from 17 to 20 percent by weight.
  • the percent weights being based on the total weight of the rinse composition, in each case.
  • the diol may, for example, be present in the rinse composition in an amount of typically from 1 to 20 percent by weight, more typically from 5 to 15 percent by weight, and further typically in an amount of from 10 to 12 percent by weight. The percent weights being based on the total weight of the rinse composition, in each case.
  • the dyed semi-finished product is typically dried prior to use in molding or shaping a finished article therefrom.
  • the present invention is more particularly described in the following examples, which are intended to be illustrative only, since numerous modifications and variations therein will be apparent to those skilled in the art. Unless otherwise specified, all parts and percentages are by weight.
  • the dye bath is prepared by mixing deionized water, carrier and diol together in a mixing tank, thus forming a liquid mixture.
  • the liquid mixture is passed continuously at a temperature of 95°C through a bag filter into which 50 grams of dye is placed.
  • the heated mixture containing dye is cycled from the mixing tank through the bag filter and back to the mixing tank for a period of time sufficient to saturate the mixture of water, carrier and diol with dye, and thus form the dye bath.
  • the amount of dye in the dye bath is about 0,1 percent by weight.
  • the dye bath contains about 70 percent by weight (pbw) deionized water, 18 pbw ethyleneglycol mono-butyl ether (as carrier) and 12 pbw diethylene glycol (as diol), the percent weights being based on the total weight of deionized water, carrier and diol.
  • This liquid mixture is passed through a bag filter into which 50 grams of dye is introduced.
  • Yellow 3R dyes obtained from LanXess Corporation.
  • the pellets (1.4 kg) were placed in a wire mesh basket having sufficient mesh size to allowing the coloring solution to surround the pellets while the pellets were retained in the basket.
  • the basket, containing the pellets was then immersed in the coloring solution at 95°C. After 5 minutes, the pellets were rinsed with dye-free coloring solution to remove excess dye from the pellet surfaces and finally the pellets were rinsed with deionized water. After thorough drying in a convection oven, the pellets were molded into speciments having dimensions of 5 cm x 7.5 cm x 0.25 cm.

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Abstract

L'invention concerne un procédé de teinture d'un produit semi-fini. Le procédé comprend les étapes consistant à : (a) fournir un produit semi-fini sélectionné dans le groupe comprenant des poudres, des pastilles et des fils de base, contenant au moins un polymère thermoplastique ; (b) immerger le produit semi-fini dans un bain de teinture, comprenant, (i) au moins une teinture, (ii) de l'eau, (iii) au moins un support représenté par la formule générale suivante I, (I) R1[O(CH2)n]mOR2, dans laquelle R1 et R2 indiquent indépendamment l'un de l'autre H, des radicaux alkyle en C1-18, benzyle, benzoyle ou phényle qui peuvent être substitués dans le noyau aromatique par un alkyle et/ou un halogène, n est 2 ou 3, et m est 1 à 35, et (iv) un diol sélectionné parmi au moins des diols aliphatiques en C2-C20 linéaires ou ramifiés, du poly(alkylèneglycol en C2-C4), des diols cycloaliphatiques ayant de 5 à 8 atomes de carbone dans le noyau cyclique, des diols aromatiques monocycliques, des bisphénols et bisphénols hydrogénés ; (c) retenir le produit semi-fini dans ledit bain pendant une période de temps suffisante pour former un produit semi-fini teinté ; et (d) enlever le produit semi-fini teinté dudit bain.
PCT/US2007/024802 2006-12-05 2007-12-04 Procédé de teinture d'un produit semi-fini WO2008070056A2 (fr)

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WO2005061597A2 (fr) * 2003-12-11 2005-07-07 Bayer Materialscience Llc Procede de traitement d'articles en plastique
WO2005061780A1 (fr) * 2003-12-11 2005-07-07 Bayer Materialscience Llc Procede de coloration d'un article en plastique
EP1739119A1 (fr) * 2005-06-29 2007-01-03 Bayer MaterialScience AG Procédé pour le traitement de profilés en matière plastique

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US20070079453A1 (en) 2007-04-12
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