Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
  • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
  • D06M11/32—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond
  • D06M11/36—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with oxygen, ozone, ozonides, oxides, hydroxides or percompounds; Salts derived from anions with an amphoteric element-oxygen bond with oxides, hydroxides or mixed oxides; with salts derived from anions with an amphoteric element-oxygen bond
  • D06M11/38—Oxides or hydroxides of elements of Groups 1 or 11 of the Periodic Table
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
  • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
  • D06M11/77—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with silicon or compounds thereof
  • D06M11/79—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with silicon or compounds thereof with silicon dioxide, silicic acids or their salts

Definitions

• the present invention provides a composition for the alkali treatment of a cellulosic substrate and a method for such treatment which comprises applying the composi ⁇ tion to such a substrate.
• composition of the present invention is an aqueous liquor containing as an essential component potassium hydroxide.
• the treatment liquor may contain, in addition to the potassium hydroxide, other alkali metal hydroxides, such as sodium hydroxide. However, at least 75%, by weight, of the total alkali metal content must be potassium hydroxide. Preferably, potassium hydroxide is the sole alkali metal hydroxide present.
• the amount of alkali metal hydroxide in the treat ⁇ ment liquor should be enough to improve the dyeability of the cellulosic substrate and is preferably in the range about 120 to 400 g/1, more preferably about 200 to 330 g/1, most preferably 240 to 300 g/1.
• the alkalinity of the treatment liquor desirably is in the range of about 18 to 30° Be, especially about 20 to 27°B_f.
• the treat ⁇ ment liquor preferably contains an alkali metal silicate- More preferably, the alkali metal silicate is sodium or potassium silicate.
• the amount of alkali metal silicate present is generally up to about 100 g/1 and is preferably in the range about 5 to 85 g/1, more preferably 10 to 70 g/1/ most preferably 15 to 35 g/1, the amount being such that the alkalinity of the treatment liquor will be as stated above.
• the ratio of alkali metal hydroxide to alkali metal silicate may range from about 2:1 to 20:1, preferably about 4:1 to 16:1, more preferably about 6:1 to 13:1, by weight.
• a further preferred constituent of the alkali treat ⁇ ment liquor is a wetting agent.
• Preferred wetting agents are anionic, non-ionic or amphoteric surfactants which are stable to aqueous potassium hydroxide in the amounts employed. Such com ⁇ pounds are known and commercially available. More pref ⁇ erably the wetting agent is of the anionic type, optionally in the form of a mixture with one or more other anionic wetting agents or with a non-ionic or amphoteric wetting agent.
• Suitable anionic wetting agents include: i) sulphated C. ?4 alcohols or glycols, optionally ethoxylated with 2 to 25 ethyleneoxy units; ii) alkyl C_ _ Q phosphoric acid esters or semi-esters; iii) alkyl C.
• anionic wetting agents are those of types i), iii), iv) and vii) above.
• the most preferred anionic wetting agent is sodium 2-ethylhexyl sulphate.
• the amount of wetting agent, when present, should be sufficient to promote uniform impregnation of the sub ⁇ strate with the treatment liquor during the application step and is generally up to about 20 g/1, preferably 0.1 to 10, more preferably 0.5 to 7.5, most preferably 1 to 5 grams, per liter of treatment liquor.
• a further preferred component of the treatment liquor is an alkali-resistant agent capable of sequestering or complexing with heavy metal ions. It is believed that such an agent inhibits the formation of less water- soluble metal silicates which might interfere with the removal of the alkali metal silicate during the rinsing of the substrate which follows the alkali treatment step.
• alkali-resistant agent capable of sequestering or complexing with heavy metal ions. It is believed that such an agent inhibits the formation of less water- soluble metal silicates which might interfere with the removal of the alkali metal silicate during the rinsing of the substrate which follows the alkali treatment step.
• Compounds useful for tying up heavy metal ions in aqueous media are known.
• the preferred such compounds for use in the process of the present invention are alkali metal salts of hydroxycarboxylic acids, particularly pentonic, hexonic and heptonic acids, and more particularly gluconic acid, especially sodium gluconate.
• cation sequestering agents include alkali metal glucoheptonates and alkali metal salts of nitrilo- carboxylic acids and of ethylenediamine-tetraacetic acid.
• the sequestering or complexing agent is conveniently added to the treatment liquor in an amount which may range up to about 40 g/1, .depending, for instance on the hardness of the water.
• the amount of this component is in the range about 0.2 to 20, more preferably about 0.5 to 10, most preferably 2.5 to 5 g/1.
• the metal-sequestering or complexing agent is conveniently added to the treatment liquor in admixture with a dispersing agent, preferably an anionic dispersant, such as a sulphonated fatty acid amide.
• a dispersing agent preferably an anionic dispersant, such as a sulphonated fatty acid amide.
• a particularly preferred mixture is an aqueous composition comprising by weight, 15% sodium gluconate and 5% sulphonated fatty acid amide.
• a compound having textile lubricating as well as dispersing properties and particularly such compounds which have the further property of acting as retarding leveling agents for reactive dyes.
• Anionic compounds are preferred, especially sulphonated or sulphated castor oil.
• the amount of such a compound is preferably 0.1 to 15, more preferably 1 to 15 grams per liter of alkali treatment bath.
• the aqueous alkali treatment liquor is applied to the substrate at a temperature which is above 7°C and is generally in the range about 10 to 100°C.
• the temperature is in the range 18-80 C, most preferably 20-35°C.
• the liquor can be applied to the substrate by various methods, such as spraying, foam application or immersion.
• the liquor is applied by padding.
• a pick-up of about 70 to 180%, more preferably 80 to 150%, most pref ⁇ erably 90 to 140% is achieved.
• the alkali treatment liquor is applied in the form of a foam
• techniques similar to those known in the art for effecting various textile treatments can be. employed.
• the amount of foam applied will be sufficient to bring into contact with the substrate an amount of alkali treatment components equivalent to those applied e.g. by padding.
• the substrate is allowed to dwell for a period of time sufficient to permit the components of the liquor to act on the cellulosic material.
• the dwell time is at least about 0.5 hour, preferably about 0.5 to 10 hours, more preferably about 1 to 4 hours. This can be con ⁇ veniently effected by winding the impregnated substrate on a beam, which is optionally rotated during the dwelling.
• the goods may be stored in any suitable receptacle during the dwelling period. Dwelling is normally effected at ambient temperature, e.g. 18 to 35°C, preferably 21 to 20°C. With bulkier materials, such as corduroy, it may not be practical to effect a dwelling in the manner described above.
• this brief dwelling interval will be at least about 10 seconds, preferably about 15 to 120 seconds, and most preferably about 30 to 60 seconds.
• moist heat e.g. steam, or dry heat e.g. at about 82-105°C may be employed.
• the substrate can be washed, bleached and dried in conventional fashion. Washing is generally effected with water, preferably softened or demineralized, at room temperature to boiling, preferably at about 65 to 94 C.
• the bleaching can be effected with a conventional peroxide bleaching composition.
• the substrate treated according to the present in ⁇ vention can be a blend of cellulosic fibers with other fibers, e.g., polyester.
• the substrate is 100% cellulosic, more preferably cotton.
• the substrate can be in a variety of forms, e.g., woven, knitted or yarn. It is a particular advantage of the process of the invention that it can be used for the alkali treatment of knitted goods, more particularly tubular knitted goods.
• Corduroy is another material for which the alkali treatment of this invention is espec ⁇ ially advantageous.
• Cellulosic fiber goods treated with a composition or process according to the invention have a smooth appearance with increased luster (gloss), tensile strength, and elongation strength and stability.
• the process can be effected without the need for having the goods under tension (except the normal lengthwise tension exerted when the material is drawn between rollers during treatment).
• the need for a tenter frame to keep the material under tension is avoided and the process can be employed for the treatment of tubular knitted goods.
• the reduced shrinkage also makes this process attractive for the treatment of pile-surfaced substrates, such as corduroy.
• Alkaline treatment baths are made up as follows:
• composition of each bath is given in Table 1 below.
• EXAMPLE 1 a) A flattened length of tubular knit grey (un ⁇ bleached) cotton is continuously drawn from a basket through Bath 1 above, which is at approximately room temperature. The immersion time in the bath is about 1 to 2 seconds. The wetted substrate is then squeezed between a pair of rollers to a wet pick-up of about 90%. During this sequence the only tension on the cotton substrate is that caused by the lengthwise pulling of said substrate from its initial slack position in the basket through the nip of the squeezing rollers at a speed of about 10 yards per minute. The wetted substrate is then fed into a second basket where it is allowed to dwell in a tension-free condition for a period of about two hours at room temperature.
• the above-treated substrate is then washed continuously for about 5 to 10 minutes with water at about 71-82 C, treated with sufficient aqueous acetic acid to neutralize any residual alkali and washed again briefly with water to remove any excess acetic acid.
• the substrate is squeezed between rollers to a moisture content of approximately 80% and passed for about 5 to 10 seconds through a peroxide saturation bath which typically contains about 20-30 g/1 caustic soda (100%), 4.5 g/1 surfactant, 3-4 g/1 chelating agent, 50-70 g/1 sodium silicate and 30-50 g/1 hydrogen peroxide and which is at a temperature of about 48- 55 F.
• the material is again squeezed between rollers to ensure uniform distribution of the peroxide solution and then drawn into a J box where it is subjected to steam at about 94 to 100°C. for about 90 minutes.
• the substrate is then washed with water at about 71 to 82°C. to remove any residual peroxide solution components, squeezed through rollers and dried by passage over heated perforated cylinders in conventional manner.
• the substrate is essentially under only that amount of tension created by the rollers drawing it from its tension-free condi ⁇ tion in the dwelling basket and in the J box.
• a flattened length of tubular knit grey cotton is treated as described in paragraphs a) and b) of Example 1, except that it is immersed in Bath 2 instead of Bath 1.
• a substrate identical to that treated in Examples 1 and 2 is treated only according to paragraph b) of Example 1.
• a substrate identical to that treated in Example 3 is treated only according to paragraph b) of Example 1.
• the shrinkage of the substrate of Example 3 was about 0.6% in width and 8.5% in length.
• the substrates treated according to Examples 1 and 2 and Cl were dyed under identical conditions with the same reactive dye by the pad batch method.
• Example 1 Compared to Cl the substrate of Example 1 exhibited 23.7% greater dye affinity and the substrate of Example 2- xhibited 13.9% greater dye affinity.
• the substrate treated according to Examples 3 and C2 were dyed under identical conditions with the same reactive dye by the pad batch method. Compared to C2 the substrate of Example 3 exhibited more than 40% greater dye affinity. Wash Shrinkage
• a continuous length of tubular single knit grey cotton jersey is drawn open width at a speed of about 50 yds./min. over a series of rollers, through a treat ⁇ ment bath, through a pair of squeeze rollers and onto a perforated roller. During this passage the material is under tension only in a lengthwise direction.
• the temperature of the treatment bath is 25 F. and its composition is ⁇ .s follows: 270 g/1 potassium hydroxide (as 90% flakes), 75 g/1 sodium silicate (as a 42 Be aqueous solution); 15 g/1 of the sodium gluconate-sulphonated fatty acid amide mixture specifically described above; 5 g/1 sulphonated castor oil (35% active) and 3 g/1 sodium 2-ethylhexyl sulphate (about 20 active).
• a bubble of air is maintained in the length of tubular material between a roller in the treatment bath and the squeeze rollers.
• the speed of travel of the material and the pres ⁇ sure of the squeeze rollers in such as to give a wet pick-up of about 116%, based on the weight of the material.
• the impregnated material is allowed to dwell on the perforated roller for about 2 hours at room tem ⁇ perature.
• the thus-treated substrate is characterized by improved luster and dyeability along with very good hand and stretchability.
• Example 4 The procedure of Example 4 is repeated, except that the pick-up is about 130% and the treatment liquor comprises: 250 g/1 potassium hydroxide (100%); 130 g/1 sodium silicate (30%); 15 g/1 sodium gluconate- sulphonated fatty acid amide; 7 g/1 sulphonated castor oil (35%); and 12 g/1 sodium 2-ethylhexyl sul ⁇ phate (20%).
• the resulting knitted cotton substrate has good luster, dyeability, and dimensional stability.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
• Chemical Or Physical Treatment Of Fibers (AREA)
• Detergent Compositions (AREA)
• Coloring (AREA)
• Treatment Of Fiber Materials (AREA)

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Publications (1)

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Family Applications (1)

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Cited By (5)

Citations (5)

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• 1985
  • 1985-04-24 EP EP19850902362 patent/EP0220170B1/de not_active Expired
  • 1985-04-24 WO PCT/US1985/000760 patent/WO1986006425A1/en active IP Right Grant
  • 1985-04-24 DE DE8585902362T patent/DE3573625D1/de not_active Expired
  • 1985-04-24 JP JP50193585A patent/JPS63500530A/ja active Pending

Patent Citations (5)

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