EP1880052A2 - Spinning baths - Google Patents

Spinning baths

Info

Publication number
EP1880052A2
EP1880052A2 EP06763115A EP06763115A EP1880052A2 EP 1880052 A2 EP1880052 A2 EP 1880052A2 EP 06763115 A EP06763115 A EP 06763115A EP 06763115 A EP06763115 A EP 06763115A EP 1880052 A2 EP1880052 A2 EP 1880052A2
Authority
EP
European Patent Office
Prior art keywords
spinning
weight
spinning bath
bath according
fibres
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06763115A
Other languages
German (de)
French (fr)
Inventor
Franco Reggiori
Marco Luoni
Davide Bianchi
Ermanno Mino
Giuseppe Li Bassi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lamberti SpA
Original Assignee
Lamberti SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lamberti SpA filed Critical Lamberti SpA
Publication of EP1880052A2 publication Critical patent/EP1880052A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/80—Masked polyisocyanates
    • C08G18/8061—Masked polyisocyanates masked with compounds having only one group containing active hydrogen
    • C08G18/8083—Masked polyisocyanates masked with compounds having only one group containing active hydrogen with compounds containing at least one heteroatom other than oxygen or nitrogen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/0804—Manufacture of polymers containing ionic or ionogenic groups
    • C08G18/0819—Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic groups
    • C08G18/0823—Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic groups containing carboxylate salt groups or groups forming them
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/34—Carboxylic acids; Esters thereof with monohydroxyl compounds
    • C08G18/348—Hydroxycarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • C08G18/4833—Polyethers containing oxyethylene units
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/73—Polyisocyanates or polyisothiocyanates acyclic
    • 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
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/564—Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
    • D06M15/568—Reaction products of isocyanates with polyethers
    • 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
    • D06M7/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made of other substances with subsequent freeing of the treated goods from the treating medium, e.g. swelling, e.g. polyolefins
    • 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
    • D06M2200/00—Functionality of the treatment composition and/or properties imparted to the textile material
    • D06M2200/40—Reduced friction resistance, lubricant properties; Sizing compositions

Definitions

  • the present invention refers to spinning baths for natural fibres and blends imparting improved characteristics to the spun yarn and to the relative spinning process.
  • the spinning bath of the invention contains a water soluble polyisocyanate having an average of three or more bisulphite blocked
  • the spinning process comprising the use of such spinning baths reduces the amount of wasted fibres, i.e. of the fibres discarded during carding, diminishes the dust level both during carding and combing and enhances the process yield.
  • the resulting spun yarn is very even and highly resistant and elastic.
  • chemical additives such as lubricants, antistatic, cohesive and wetting agents, emulsifiers, antimicrobials; they are dissolved or emulsified in water and applied to the fibres in order to protect them during the transformation into spun yarn.
  • spinning baths The aqueous compositions comprising the above listed chemical additives and that are used in spinning are named "spinning baths".
  • card spinning comprises a carding step
  • comb spinning comprises a carding step and a combing step.
  • Card spinning is made by means of a carding machine and is preceded by the spray deposition of a spinning bath on the fibres; card spinning is the kind of spinning technique used to treat the larger amounts of wool and blends.
  • carded sliver obtained from carding is directly conveyed to the spinning process.
  • the fibres which have been treated with the spinning bath are conveyed to the carding machine and become the carded sliver; the carded sliver, before entering the spinning phase, is treated again with a spray spinning bath, and then driven through the combs (combing step) before reaching the spinning area.
  • Comb yarn spinning needs high machine speed and it is the more expensive and critical spinning process, leading to the highest quality spun yarns.
  • the spinning baths of the present invention are useful bot for card spinning and for comb spinning.
  • the spinning baths of the invention have the further advantage that they maintain the machine clean during all the process.
  • the wasted fibres are reduced in spinning by at least 15-30% by weight (the comparison is made by using an analogue spinning bath without polyisocyanate).
  • polyols obtained from the condensation of trimethylolpropane and ethylene oxide, propylene oxide or mixture thereof, and with neutralised bis(hydroxymethyl) propionic acid, and having a molecular weight comprised between 500 and 6000, preferably between 1000 and 3000, are particularly preferred for the preparation of the water soluble polyisocyanate of the invention.
  • the diisocyanates which are preferred for the realisation of the invention may be either of the aliphatic or of the cycloaliphatic type, such as those of formula OCN-Y-NCO, where Y is -(CH 2 )6-, 3-methylene-3,5,5- trimethylcyclohexane-1-yl, 4,4'-methylenebis(ciclohexyl) or 3,3'- methylenebis(cyclohexyl).
  • the particularly preferred diisocyanate has the formula OCN-Y-NCO, where Y is -(Chbj ⁇ -, i.e. hexamethylene diisocyanate.
  • the spinning baths for use in carding preferably contain from 1 to 3% by weight of polyisocyanate, those for use in combing preferably contain from 0.3 to 2.5% by weight of polyisocyanate.
  • the spinning baths of the invention contain, beside the above described polyisocyanate, one or more lubricants, one or more antistatic agents, one or more cohesive agents and water.
  • lubricants which are utilisable for the preparation of the spinning baths of the invention are those commonly used in the field and described for example in the book Handbook of Fiber Finishing Technology. Edited by SLADE, Philip. NY: Marcel Dekker, Inc, 1998. ISBN 0824700481.
  • fatty acid esters for example, esters of stearic and oleic acid, optionally ethoxylated or propoxylated, propyl or cetyl esters of myristic acid, isopropyl, octyl or cetyl esters of palmitic acid
  • mineral oils for example, mineral oils, fatty alcohols and acids, water soluble copolymers of ethylene oxide, propylene oxide or mixture thereof.
  • the preferred lubricants essentially consists of ethoxylated fatty acid esters, and in particular, of ethoxylated stearic and/or oleic acid esters.
  • the amount of lubricant in the spinning bath ranges from 1 to 20% by weight, preferably from 5 to 12% by weight.
  • the spinning baths according to the invention further contain an antistatic agent.
  • the utilisable antistatic agents are those which are normally used in the field and may be either of the anionic, cationic, nonionic or amphoteric kind; the most commonly used are those of the anionic kind (such as alcohol phosphates, phosphate esters of aliphatic alcohols, phosphate esters of ethoxylated aliphatic alcohols) and of the cationic kind (generally quaternary ammonium salts).
  • the antistatic agent of the spinning bath of the invention is anionic; more preferably, it essentially consists of a mixture of alcohol phosphates and ethoxylated fatty acids.
  • the amount of antistatic agent in the spinning bath ranges from 1 to 15% by weight, preferably from 1 to 10% by weight in card spinning, from 5 to 15% by weight in comb spinning.
  • Cohesive agents are further chemical additives contained in the spinning baths of the invention.
  • the cohesive agent of the spinning bath of the invention is dispersed colloidal silica.
  • the amount of cohesive agent in the spinning bath varies from 0.1 to 2% by weight.
  • the spinning bath of the invention may further contain other chemical additives, such as antimicrobials, wetting agents, moth proof agents, temporary dyes etc.
  • the percentage of water in the spinning bath may vary from 70 to 90% by weight.
  • the spinning bath of the invention are particularly useful for the treatment of animal natural fibres, particularly wool, cashmere, alpaca, mohair, silk, and mixture thereof, and of blends, i.e. of mixtures of animal natural fibres with cotton, polyester, artificial fibres, polyamide or polyacrylic fibres, where the natural fibres represent at least 50% by weight of the total weight.
  • the fibres may be previously treated with a bleaching agent.
  • the spinning bath is deposited by spraying technique on the fibres, which have been previously washed, dried and optionally bleached.
  • the amount of bath to be applied on the fibres is from 5 to 20% by weight, preferably from 12 to 18% by weight, in case of carding, and from 1 to
  • the spinning baths of the invention are applied according to methods which are well known in the art, as specific variations are not required.
  • the spun yarn obtained from the process of the invention may have a yarn count comprised between 8 and 9 Ne in carding, and from 40 to 150 Ne in combing.
  • the following examples illustrate some advantages obtained on the spun yarn when using the spinning process of the present invention.
  • Kg 2 Antistatic GE50 (50% antistatic agent, from Lamberti SpA)
  • a spinning bath is prepared by mixing the following ingredients in the order, at room temperature, under mechanical stirring: [0056] Kg 10.8 Water
  • the spun yarns are evaluated with the following standard methods: [0065] Yarn count (Ne 1/x): UNI EN ISO 2060:97 [0066] Elongation (%)and strength (10 2 *N): UNI EN 2062:97 [0067] Thin sections and thick sections, neps (No./1000 m) and irregularities

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Artificial Filaments (AREA)
  • Polyurethanes Or Polyureas (AREA)

Abstract

The invention relates to spinning baths comprising from 0.1 to 6% by weight of a water soluble polyisocyanate having an average of three or more bisulphite blocked -N=C=O groups and obtained by reaction of one or more polyols with one or more diisocyanates and further reaction of the intermediate product with a bisulphite solution.

Description

Description
SPINNING BATHS [0001] The present invention refers to spinning baths for natural fibres and blends imparting improved characteristics to the spun yarn and to the relative spinning process. [0002] In particular, the spinning bath of the invention contains a water soluble polyisocyanate having an average of three or more bisulphite blocked
-N=C=O groups. [0003] According to a fundamental aspect of the invention, the spinning process comprising the use of such spinning baths reduces the amount of wasted fibres, i.e. of the fibres discarded during carding, diminishes the dust level both during carding and combing and enhances the process yield. [0004] Furthermore, the resulting spun yarn is very even and highly resistant and elastic. [0005] During the transformation of the wool staple or blends into spun yarn several chemical additives are used, such as lubricants, antistatic, cohesive and wetting agents, emulsifiers, antimicrobials; they are dissolved or emulsified in water and applied to the fibres in order to protect them during the transformation into spun yarn. [0006] The aqueous compositions comprising the above listed chemical additives and that are used in spinning are named "spinning baths". [0007] As it is well known, the transformation of the wool or blend staple into spun yarn is generally performed by means of card spinning or comb spinning; card spinning comprises a carding step, comb spinning comprises a carding step and a combing step. [0008] Card spinning is made by means of a carding machine and is preceded by the spray deposition of a spinning bath on the fibres; card spinning is the kind of spinning technique used to treat the larger amounts of wool and blends. [0009] In card spinning, the carded sliver obtained from carding is directly conveyed to the spinning process. [0010] On the other hand, in comb spinning, the fibres which have been treated with the spinning bath are conveyed to the carding machine and become the carded sliver; the carded sliver, before entering the spinning phase, is treated again with a spray spinning bath, and then driven through the combs (combing step) before reaching the spinning area. [0011] Comb yarn spinning needs high machine speed and it is the more expensive and critical spinning process, leading to the highest quality spun yarns. [0012] The spinning baths of the present invention are useful bot for card spinning and for comb spinning. [0013] In carding, the spinning baths of the invention have the further advantage that they maintain the machine clean during all the process. [0014] It is an object of the present invention a spinning bath for natural animal fibres and blends containing from 0.1 to 6% by weight of a water soluble polyisocyanate having an average of three or more bisulphite blocked -N=C=O groups.
[0015] It is a further object of the invention a spinning process for natural animal fibres and blends comprising the step of applying to the fibres from 1 to 20% by weight of the above described spinning bath.
[0016] According to a fundamental aspect, by using the process of the invention, the wasted fibres are reduced in spinning by at least 15-30% by weight (the comparison is made by using an analogue spinning bath without polyisocyanate).
[0017] Water soluble polyisocyanate having an average of three or more bisulphite blocked -N=C=O groups are known and are prepared as described in US 3898197 and DE 2837851 by reaction of one or more compounds containing at least two hydroxyl groups (polyols) with one or more diisocyanates and further reaction of the intermediate product with a bisulphite solution.
[0018] The polyols obtained from the condensation of trimethylolpropane and ethylene oxide, propylene oxide or mixture thereof, and with neutralised bis(hydroxymethyl) propionic acid, and having a molecular weight comprised between 500 and 6000, preferably between 1000 and 3000, are particularly preferred for the preparation of the water soluble polyisocyanate of the invention.
[0019] The diisocyanates which are preferred for the realisation of the invention may be either of the aliphatic or of the cycloaliphatic type, such as those of formula OCN-Y-NCO, where Y is -(CH2)6-, 3-methylene-3,5,5- trimethylcyclohexane-1-yl, 4,4'-methylenebis(ciclohexyl) or 3,3'- methylenebis(cyclohexyl).
[0020] The particularly preferred diisocyanate has the formula OCN-Y-NCO, where Y is -(Chbjδ-, i.e. hexamethylene diisocyanate.
[0021] Water soluble polyisocyanates having an average of three or more bisulphite blocked -N=C=O groups useful for the present invention are available on the market; they are also sold by Lamberti SpA with the trade namen Elafix PV4.
[0022] As far as we know, nobody had previously suggested the use of bisulphite blocked polyisocyanates in spinning baths as essential ingredients to reduce the off cuts and to improve the quality of the spun yarn.
[0023] The spinning baths for use in carding preferably contain from 1 to 3% by weight of polyisocyanate, those for use in combing preferably contain from 0.3 to 2.5% by weight of polyisocyanate.
[0024] The spinning baths of the invention contain, beside the above described polyisocyanate, one or more lubricants, one or more antistatic agents, one or more cohesive agents and water. [0025] The lubricants which are utilisable for the preparation of the spinning baths of the invention are those commonly used in the field and described for example in the book Handbook of Fiber Finishing Technology. Edited by SLADE, Philip. NY: Marcel Dekker, Inc, 1998. ISBN 0824700481. , such as fatty acid esters (for example, esters of stearic and oleic acid, optionally ethoxylated or propoxylated, propyl or cetyl esters of myristic acid, isopropyl, octyl or cetyl esters of palmitic acid), mineral oils, fatty alcohols and acids, water soluble copolymers of ethylene oxide, propylene oxide or mixture thereof.
[0026] The preferred lubricants essentially consists of ethoxylated fatty acid esters, and in particular, of ethoxylated stearic and/or oleic acid esters.
[0027] The amount of lubricant in the spinning bath ranges from 1 to 20% by weight, preferably from 5 to 12% by weight.
[0028] The spinning baths according to the invention further contain an antistatic agent.
[0029] The utilisable antistatic agents are those which are normally used in the field and may be either of the anionic, cationic, nonionic or amphoteric kind; the most commonly used are those of the anionic kind (such as alcohol phosphates, phosphate esters of aliphatic alcohols, phosphate esters of ethoxylated aliphatic alcohols) and of the cationic kind (generally quaternary ammonium salts).
[0030] Preferably, the antistatic agent of the spinning bath of the invention is anionic; more preferably, it essentially consists of a mixture of alcohol phosphates and ethoxylated fatty acids.
[0031] The amount of antistatic agent in the spinning bath ranges from 1 to 15% by weight, preferably from 1 to 10% by weight in card spinning, from 5 to 15% by weight in comb spinning.
[0032] Cohesive agents are further chemical additives contained in the spinning baths of the invention.
[0033] Preferably, the cohesive agent of the spinning bath of the invention is dispersed colloidal silica.
[0034] The amount of cohesive agent in the spinning bath varies from 0.1 to 2% by weight.
[0035] The spinning bath of the invention may further contain other chemical additives, such as antimicrobials, wetting agents, moth proof agents, temporary dyes etc.
[0036] The percentage of water in the spinning bath may vary from 70 to 90% by weight.
[0037] The spinning bath of the invention are particularly useful for the treatment of animal natural fibres, particularly wool, cashmere, alpaca, mohair, silk, and mixture thereof, and of blends, i.e. of mixtures of animal natural fibres with cotton, polyester, artificial fibres, polyamide or polyacrylic fibres, where the natural fibres represent at least 50% by weight of the total weight.
[0038] The fibres may be previously treated with a bleaching agent. [0039] Before the carding step and, in case, before the combing step, the spinning bath is deposited by spraying technique on the fibres, which have been previously washed, dried and optionally bleached. [0040] The amount of bath to be applied on the fibres is from 5 to 20% by weight, preferably from 12 to 18% by weight, in case of carding, and from 1 to
6% by weight, preferably from 2 to 4% by weight, in case of combing. [0041] The spinning baths of the invention are applied according to methods which are well known in the art, as specific variations are not required. [0042] The spun yarn obtained from the process of the invention may have a yarn count comprised between 8 and 9 Ne in carding, and from 40 to 150 Ne in combing. [0043] The following examples illustrate some advantages obtained on the spun yarn when using the spinning process of the present invention. [0044] Example 1
[0045] Preparation of a spinning bath according to the invention. [0046] The following ingredients are mixed in the order, at room temperature, under mechanical stirring: [0047] Kg 10 Water
[0048] Kg 3 Monol T/1 (53% lubricant, from Lamberti SpA)
[0049] Kg 2 Antistatic GE50 (50% antistatic agent, from Lamberti SpA)
[0050] Kg 0.2 Microtex D9 (10% dispersed colloidal silica, from Lamberti
SpA)
[0051] Kg 0.8 bisulphite blocked polyisocyanate, 28% water solution, [0052] derived from ethoxylated trimethylolpropane, hexamethylene diisocyanate and neutralised dimethylolpropionic acid [0053] Example 2
[0054] Preparation of a comparative spinning bath. [0055] A spinning bath is prepared by mixing the following ingredients in the order, at room temperature, under mechanical stirring: [0056] Kg 10.8 Water
[0057] Kg 3 Monol T/1 (53% lubricant, from Lamberti SpA)
[0058] Kg 2 Antistatic GE50 (50% antistatic, from Lamberti SpA)
[0059] Kg 0.2 Microtex D9 (10% dispersed colloidal silica, from Lamberti
SpA)
[0060] Application tests [0061] The spinning baths of Examples 1 and 2 are applied on the fibres reported in Tables 1-6, by spray technique, in an amount of 16 Kg/100Kg fibres. [0062] The fibres are mixed in the usual cells for two hours. [0063] The fibres are subsequently carded with an industrial carding machine and the carded sliver is spinned with a ring spinning frame to obtain a spun yarn having the desired yarn count (see Tables 1-6)
[0064] The spun yarns are evaluated with the following standard methods: [0065] Yarn count (Ne 1/x): UNI EN ISO 2060:97 [0066] Elongation (%)and strength (102*N): UNI EN 2062:97 [0067] Thin sections and thick sections, neps (No./1000 m) and irregularities
(U%): Uster Standard.
[0068] The results of these evaluations are reported in Tables 1-6. [0069]
Table 1
[0070]
[0071]
[0072] Table 4
[0073]
[0074] [0075]
[0076] *Wool/cashmere 80/20 [0077] [0078]

Claims

Claims
1. Spinning bath comprising from 0.1 to 6% by weight of a water soluble polyisocyanate having an average of three or more bisulphite blocked -N=C=O groups and obtained by reaction of one or more polyols with one or more diisocyanates and further reaction of the intermediate product with a bisulphite solution.
2. Spinning bath according to claim 1., wherein the polyol is obtained from the condensation of trimethylol propane with ethylene oxide, propylene oxide or mixture thereof, and with neutralised bis(hydroxymethyl) propionic acid, and has a molecular weight comprised between 500 and 6000.
3. Spinning bath according to claim 2., wherein the diisocyanate is an aliphatic or a cycloaliphatic diisocyanate.
4. Spinning bath according to claim 3., wherein the diisocyanate has the formula OCN-Y-NCO, where Y is -(CH2)6-, S-methylene-S.δ.δ-trimethylcyclohexane-i- yl, 4,4'-methylenebis(ciclohexyl) or 3,3'-methylenebis(cyclohexyl).
5. Spinning bath according to claim 4., wherein Y is -(Chbjδ-.
6. Spinning bath according to claim 5., further comprising from 1 to 20% by weight of one or more lubricants, from 1 to 15% by weight of one or more antistatic agents, from 0.1 to 2% by weight of one or more cohesive agents, from 70 to 90% by weight of water.
7. Spinning bath according to claim 6., wherein the lubricant essentially consists of ethoxylated fatty acid esters, the antistatic agent is anionic and the cohesive agent is dispersed colloidal silica.
8. Spinning bath according to claim 7., wherein the ethoxylated fatty acid esters are ethoxylated stearic and/or oleic acid esters and the antistatic agent essentially consists of a mixture of alcohol phosphates and ethoxylated fatty acids.
9. Spinning process for natural animal fibres and blends comprising the step of applying to the fibres from 1 to 20% by weight of a spinning bath according to any of claims from 1. to 8.
10. Spinning process according to claim 9. wherein the amount of bath to be applied on the fibres is from 5 to 20% by weight in case of carding, and from 1 to 6% by weight in case of combing.
EP06763115A 2005-05-13 2006-05-10 Spinning baths Withdrawn EP1880052A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVA20050031 ITVA20050031A1 (en) 2005-05-13 2005-05-13 SPINNING BATHS
PCT/EP2006/062209 WO2006120214A2 (en) 2005-05-13 2006-05-10 Spinning baths

Publications (1)

Publication Number Publication Date
EP1880052A2 true EP1880052A2 (en) 2008-01-23

Family

ID=37396919

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EP06763115A Withdrawn EP1880052A2 (en) 2005-05-13 2006-05-10 Spinning baths

Country Status (4)

Country Link
EP (1) EP1880052A2 (en)
CN (1) CN101248232B (en)
IT (1) ITVA20050031A1 (en)
WO (1) WO2006120214A2 (en)

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Title
See references of WO2006120214A3 *

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CN101248232B (en) 2012-02-22
WO2006120214A3 (en) 2007-07-12
WO2006120214A2 (en) 2006-11-16
ITVA20050031A1 (en) 2006-11-14
CN101248232A (en) 2008-08-20

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