FR2649732A1 - WASHABLE SILK ETOFFE AND METHOD FOR PREPARING THE SAME - Google Patents

Abstract

A silk fabric is treated with an epoxy compound, a silicone resin and an aminoplast or glyoxal resin, and is wetted once if it is dry, and dried under low tension. The fabric has a low solubility in alkalis, a small change in feel when washed and a small shrinkage in the wash.

Description

2649732.

  WASHABLE SILK ETOFFE AND METHOD FOR PREPARING THE SAME.

  The present invention relates to a washable silk fabric, treated with resins, in particular a sufficiently durable silk fabric for machine washing, and a process

for its preparation.

  We have always loved silk for its unique touch, its shine and its drape. However, the silk wears easily and as a result, it is difficult to maintain. To eliminate this disadvantage, certain processes for the durable modification of silk, using epoxides, are known. For example, synthetic epoxy compounds are padded, dried and cured together with a catalyst selected from amines, acids and acid salts (Japanese Patent Publication 10654/1958). In another embodiment, the epoxy compounds are padded, dried and vaporized or cured in the presence of alkali metal hydroxides or alkali metal alkali salts as catalyst (Japanese Patent Publication 25198/1963). According to another method, the epoxies are applied to the silk which is then treated with a crosslinking agent which reacts with the cellulose (Japanese patent application open to

Public Inspection 231079/1987).

  In Japanese Patent Applications 26784/1989 and 6175/1989, or US Patent Application Serial No. 07 / 186,846, the silk fiber is crosslinked with an epoxy compound in the presence of a special catalyst. The treated silk has improved wear resistance and light resistance as well as low solubility in alkalis. However, the touch of the treated silk is a little rigid, and the

  shrinkage in the wash is not specially improved.

2649732 -

  Japanese Patent Application Laid Open 65172/1985 discloses a process for the production of a washable pancake, using coated son made of silk yarns and synthetic fibers. It is said that this silk is resistant to washing and that its maintenance is easy. However, in the previously mentioned methods using epoxy, silk loses its unique feel. This disadvantage can be eliminated to some extent by the simultaneous use of a silicone finishing agent, but its durability is so low that the treated silk can not be machine washed. In addition, the dimensional stability of washing a fabric can not be achieved by the epoxy treatment alone. Even in the process according to Japanese Patent Application Laid-Open No. 65172/1985, mentioned above, sufficient dimensional stability can not be achieved, so that the process can not be used for applications that require repeated washing. When the proportion of synthetic fibers is increased to solve this problem, the silk loses its unique feel. According to the prior art, a combination of wear resistance, unchanged touch during washing and dimensional stability in the wash such as these have not been achieved.

  properties support the machine wash well enough.

  When trying to bring these properties together in the art

  previous, the intrinsic touch of the silk is damaged. -

  Japanese Patent Application 159582/1988 discloses a method in which a silk fabric is treated with a polydimethyl siloxane for shrink resistance. Preferably, the silk fabric is treated under some tension sufficient to promote molecular orientation in the region

  Amorphous silk, to improve the shrink resistance.

  Furthermore, it is known that various reactive crosslinking agents are used to treat silk to improve its crease resistance. Kinusen-i no Kakougijutsu-Sono Ouyo (Technology of Silk Fiber Processing and Its Application), published by Sen-i Kenkyusha, Tokyo, 1987, pp. 218 - 221. For better crease resistance, ethylene-urea resins and silicone resins are preferred. Melamine resins, ethylene-urea resins and

2649732.

  Silicone resins are less detrimental to tensile strength, elongation and tear resistance. A mixture of a melamine resin and an ethylene-urea resin or a mixture of a

  Ethylene-urea resin and a silicone resin are recommended.

  The object of the invention is the provision of a silk fabric which, while retaining its unique silk touch, exhibits reduced wear, reduced touch change by washing and high dimensional stability when washed, that is to say, a fabric of

  washable silk, and a process for its preparation.

  It has been discovered that the above object is achieved by a washable silk fabric treated with resins, characterized in that the fabric is treated with (a) an epoxy compound, (b) a silicone resin, and (c) an aminoplast resin and / or a glyoxal resin, and that the fabric has a solubility of 30% by weight or less when soaked in a 5% by weight aqueous solution of sodium hydroxide, at a temperature of 65 C for 60 minutes, a difference of 4% or less between the fold strengths in mm before and after 10 washes, and a shrinkage at

washing of 3% or less.

  The silk fabric according to the invention may be prepared by a process which is characterized in that it comprises the steps in which (a) an epoxy compound, (b) a silicone resin, and (c) an aminoplast resin and or a glyoxal resin are applied together or separately, in any order, to the silk fabric, it being understood that the epoxy compound must not be applied last; after the application, the compound and the resins are fixed to the fabric leaving the silk fabric at rest at room temperature or by heating the silk fabric; in a final step, the silk fabric which has undergone steps (a), (b) and (c) and which is in the wet state, is heat-dried, while being

kept under low voltage.

2649732.

  According to the present invention, the solubility represents the loss in weight of a silk fabric after soaking in an aqueous solution at 5% by weight of sodium hydroxide, at a temperature of 65 C for 60 minutes. The solubility should be 30% by weight or less, preferably 20% by weight or less. Solubility is related to the amount of wear during washing of a silk fabric. When the solubility is 30% by weight or less, the wear class is 3 or more. When the solubility is 20 wt.% Or less, the wear class is 5 or 4. Wear classes are determined by washing a silk fabric ten times as described in JIS (Japan). Industry Standard) L 0217 105, taking a scanning electron micrograph (x 1.000) and looking at the image to classify the degree of fiber fibrillation. In the case of a silk fabric which is not treated with the epoxy compound, the entanglement of many fibrillated fine fibers is observed on the cliché, which is classified class 1. On the contrary, there is practically no observation of fibrillation in a tissue of silk that has not been washed, but which is classified 5. When one observes some fibrillated fine fibers, the class is 4. When fine fibrillated fibers are slightly entangled, the fabric belongs to the class 3. When fine fibrillated fibers are entangled to form masses

  compact, the fabric belongs to class 2.

  In the method according to JIS L 0217 105, a domestic washing machine having a standard washing capacity and a standard tank volume having a spinning temperature is used. Water at a temperature of 30 ° C. is introduced to the highest level, and then a neutral synthetic detergent used for the fabrics is introduced in an amount of 2 g per liter of water and dissolved. to prepare a wash bath. A fabric sample, and if necessary, stuffs to complete the load are added up to a bath ratio of 1/300, in place of the stipulated ratio of 1/60, and the operation is started with adjustment of a low bath current. After 5 minutes, the operation is stopped and the sample and, if there are any, the filling fabrics are dewatered. Fresh water is poured at the normal temperature according to the above-mentioned bath ratio, followed by a rinse of

2649732 -

  two minutes. Then, the operation is stopped, and the previously mentioned two-minute spin and rinse are repeated again. After spinning, the fabric sample is hung to dry without being exposed to direct sunlight and then, if necessary, ironing completes the treatment. The folding resistance according to the invention is determined according to JIS L 1096 Method D (Heart Loop Method). A sample of a central portion of a silk fabric is taken, and this sample is treated by leaving it in a chamber at a temperature of plus / minus 2 ° C and a relative humidity of 65.

  plus / minus 2%, until equilibrium of the water content.

  Test strips (2 x 25 cm) are cut in the warp or weft direction. One end of a band is placed on the other end, so as to obtain a heart shape. Both ends are held by a grab carried by a bar

  horizontally, so that the concave portion of the heart is placed

  top of the forceps and that most of the convex portion of the heart is suspended below the forceps. The free length of the heart-shaped band is 20 cm. One minute after the heart-shaped band is held by a clip, the distance between the bottom of the heart and the upper edge of the clip (and not the top of the heart) is measured, ie L, in mm. The same band is again subjected to the measurement of L as above, after being released and returned. 20 values are obtained from the ten bands, for each of the warp and weft directions, and divided by 20, regardless of the fractions. We thus obtain the

folding resistance, Li.

  Separately, a portion of the same silk fabric is subjected to the aforementioned JIS L 0217 washing with the modified bath ratio. Another folding resistance, L2, is determined on this washed fabric. The difference between the folding resistances before and after 10 washes is defined as follows:

  Difference (%) = (L1 - L2) / L1 x 100.

  The difference should be 4% or less, preferably 3% or less, and if the difference is greater than 4%, the change in touch during washing is too great to wash the fabric into the machine. The wash shrinkage according to the invention refers to a percent shrinkage after ten washes according to the aforementioned JIS L 0217 105, with the ratio of

  bath modified, it being understood that dry ironing is not done.

  The largest narrowing in the warp and weft directions should be 3% or less, preferably 2.5% or less. When exceeding 3%, the dimensional change is too important to wash the fabric

in machine.

  According to the prior art, treated silk fabrics which have a solubility of 30% by weight or less, a difference in folding resistance of 4% or less and a shrinkage at

  washing of 3% or less, are not known.

  The epoxy compound used herein has at least one glycidyl group. Water-soluble compounds are preferred for their ease of handling. These water-soluble epoxy compounds include the mono- and polyglycidyl ethers of ethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, glycerol, polyglycerol, sorbitol, pentaerythritol, tris (2-hydroxyethyl) isocyanurate, trimethylolpropane,

  neopentyl glycol, phenol-ethylene oxide and lauryl alcohol-

  ethylene oxide. Polyglycidyl ethers of ethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, glycerol, polyglycerol, phenol-ethylene oxide and lauryl alcohol-ethylene oxide are preferred. In particular,

  ethylene glycol-diglycidyl ether and polyethylene glycol

  diglycidyl ether because they produce better effects.

  For the hardening of the epoxy compounds, conventional catalysts may be used. Sodium chloride and sodium diethylenetriamine pentaacetate are preferably used for ethylene glycol-diglycidyl ether. The silicone resins used herein include silicone elastomers including epoxy-modified silicones, amine-modified silicones, polyether-modified silicones and silicone rubbers are preferred because they impart a pleasing feel to the fabric. Silicone rubbers are particularly preferred because of their compatibility with the epoxy. End-diol silicone rubbers are particularly preferred. Conventional silicones catalysts can be used. The aminoplast resins used herein include melamine-formalin resins, triazone formaldehyde resins, urea formaldehyde resins, ethyleneurea formaldehyde resins, other N-methylol resins, N-methylol ether resins, and mixtures thereof. Melamine-formalin resins are preferred because they provide a more durable feel. The glyoxal resins used herein include dimethyloldihydroxyethylene urea and tetramethylolacetylenediurea. Conventional catalysts

  Aminoplast resins or glyoxal resins can be used.

  In the process for preparing a silk fabric according to the invention, the epoxy compound (a), the silicone resin (b) and the aminoplast resin and / or the glyoxal resin (c) are applied together or separately in one order. any, preferably in the form of an aqueous solution or an aqueous dispersion, on the silk fabric. However, the epoxy compound should not be applied last. Otherwise, the epoxy compound could damage the

  touch improved by the silicone resin.

  In the case where (a), (b) and (c) are applied together, they may be applied to the silk fabric by single immersion, padding or dipping. Then after drying

2649732.

  if necessary, they can be steamed or sprayed in order to fix them

on the stuff.

  In the case where the epoxy compound alone is first applied to the silk fabric, the compound can be applied by immersion, padding or dipping, and fixed to the fabric, leaving the fabric at rest at room temperature, that is to say according to the process known as cold sizing, by steaming or steaming after optional drying, or heating in an epoxy solution. Then, the silicone resin (b) and the aminoplast or glyoxal resin (c) are preferably applied together, preferably by padding followed by drying and steaming. According to one variant, the silicone resin (b) and the aminoplast or glyoxal resin (c) can be applied

  separately, preferably in order, (b) and then (c).

  When the compound is applied alone to a silk fabric, it can be fixed or cured in a variety of ways. For example, it can be hardened by cold sizing at a temperature of 10 to 40 C for 20 hours or more. Alternatively, it may be heated in an epoxy compound bath. Preferably, the epoxy compound is applied to the silk fabric by padding, and vaporized immediately or after drying or drying. more preferably, dried below 130 ° C. and subjected to a heat treatment, for example at a temperature of 140 to 180 ° C. for 0.5 to 2 minutes. To fix the silicone resin (b) or the aminoplast or glyoxal resin (c), the silk fabric carrying the resin is preferably first dried and then heated to dry, for example at 140 to 180 ° C. for 0.5 minutes. at 2 minutes. When the epoxy compound (a) is applied together with the resins (b) and (c), they can be fixed at one time according to the dry heating method mentioned

3 0 previously.

  Preferred concentrations of the epoxy compound (a) and resins (b) and (c) in a solution or dispersion applied to the silk fabric will be discussed hereinafter. When the epoxy resin (a) is applied by padding, its concentration is preferably 70 to 400 g / l, in particular 100 to 300 g / l. In the case of soaking, the concentration is preferably 5 to 50 g / l, in particular 10 to 40 g / l. These intervals are favorable for

2649732.

  achieve sufficient wear resistance and wet crease resistance, as well as a silky feel. The silicone resin (b) is preferably used at a solids concentration of from 0.6 to 12 g / l, in particular from 1 to 11 g / l. The aminoplast or glyoxal resin (c) is preferably used at a solids concentration of 0.5 to 10 g / l, especially 1 to 7.5 g / l. The amount of each of (a), (b) and (c) applied to the silk fabric is preferably from 3 to 12 grams per square meter of fabric. When the quantity is below the mentioned interval

  above, the results obtained are not durable in washing.

  When the quantity is greater than the above range, the

  intrinsic touch of the silk is damaged.

  One of the important points of the process for preparing a silk fabric according to the invention is that the silk fabric to which the epoxy compound (a), the silicone resin (b) and the aminoplast resin have been applied and or glyoxal (c) and which is in the wet state, is dried at

  warm while being kept under low voltage.

  This low voltage hot drying may be performed typically after the compound (a) and the resins (b) and (c) have been set or cured. This means that the silk fabric treated with (a), (b) and (c) is wetted with water or with an aqueous liquid and

  then, hot dried under low voltage.

  Alternatively, this low voltage hot drying may be carried out in a step in which one of the resins (b) or (c) is applied alone or together with the epoxy (a) and / or the other resin (c). or (b) is applied as an aqueous solution or dispersion and fixed by heating under low voltage. This

  However, the last mode of operation is less preferred.

  The term "low voltage" used herein means that the voltage is not actively applied to the fabric. Of course, some tension is inevitable to transfer the fabric into a continuous drying process. However, avoid pulling the fabric strongly or strongly between the inlet and the outlet of a dryer. It is best if the voltage is as low as possible. In order to obtain such a low tension, the narrowing of the fabric due to drying must be taken into consideration. A continuous dryer may be provided with means for detecting the voltage and

2649732.

  possible fluctuations in winding speed and feed speed, and means for adjusting these speeds. Preferably, the fabric is pneumatically fed through a slot in a dryer. In addition, the fabric is preferably transferred pneumatically or in the form of short loops suspended in a dryer. A low drying speed is then generally recommended. It is preferable to use a dryer in short loops or a net dryer equipped with the means mentioned above. When the wet silk fabric is hot dried under low tension, the fabric can shrink sufficiently to exhibit good dimensional stability in the wash

later in the machine.

  The silk fabric thus treated according to the invention can then be subjected to a conventional finishing process. For example, on the treated fabric, a softening agent or water may or may not be applied and may be heat set at 140 to 170 ° C for

  at 60 seconds, to a steam fix using a semi-

  decatizer and then calendering at room temperature. These finishing steps are also performed under low tension in the warp direction. In hot fixing, the fabric can be

  stretched, preferably to a minimum degree such as 0 to 3%.

  The invention will be better understood with the aid of the examples

  after which do not limit the present invention in any way.

  In the examples, solubility, difference in bending strength, shrinkage in wash and wear are determined as described above. Another measure of touch, bending stiffness, is measured using a KES-FB system manufactured by Kato-tech Co. The values obtained in the warp and weft directions are given as an average . The measurement is conducted on samples taken both before and after ten washes according to the above-mentioned JIS L 0217 105, with the modified bath ratio. To evaluate the light resistance, the reflectance is determined according to JIS L 0842, after 60 hours of irradiation. A yellowness index, I.J., is calculated from the 35 reflectance measurements, according to the following equation:

2649732.

  Reflectance at 650 nm - reflectance at 425 nm

  IJ. = _ _ _ _ _ _ _ _ _ _ _ _ _ _ X 100.

  Reflectance at 550 nm The lower the yellowness index, the better the resistance to light measured according to JIS L 1096, Resistance to

  Crease, Method B (Monsanto Method).

Example 1

  An immersion bath is prepared with the following materials,

  at the following concentrations, and water.

- Epoxide: ethylene glycol (n = 1)

diglycidyl ether 200 g / l.

  - Silicone resins: Ultratex FSE (Ciba-Geigy, 30% resin content) 25 g / l and Ultratex 7261 (Ciba-Geigy, content

%) 30 g / l.

  Aminoplast Resin: Beckamine MA-S (Dainippon Ink Corp.,

70% content) 10 g / l.

  Catalyst for epoxide: sodium chloride 100 g / l.

  - Catalyst for Phobotone WS silicone resins (Ciba

Geigy) 5 g / 1.

  Catalyst for Aminoplast Resin: Catalyst 376

(Dainippon Ink Corp.) 5 g / 1.

  A silk fabric called Fuji Silk, with double twist warp yarns having a yarn count of 140 and single twist weft yarns having a yarn count of 60, is immersed in the above dip bath and squeezed at 75% using an expresser, then dried at 120 ° C. and steamed at 180 ° C. for 30 seconds, in

  a hot-air dryer, with a string of pins.

  The fabric is immersed in water and dewatered, then transferred in the form of short loops on the conveyor of a short-loop dryer where the length of each short loop is measured by means of photocells, which allow 'adjust torque rollers driven by a torque motor which is regulated

2649732.

  to ensure the uniformity of the length of the short loops. At the inlet of the short-loop dryer, air injection nozzles are provided along the entire width of the fabric, to blow air on the loops from the top so as to prevent loops hangers are lifted by rising air from the bottom of the dryer. The fabric is dried at 120 ° C. under low tension. The width of the treated fabric is 110 cm. Water is then applied to the fabric and then subjected to final fixing at 140 ° C for 60 seconds, while stretched to a width of 112 cm. Then, the fabric is subjected to steam fixation in a semi-decatizer, and to a calendering at

ambient temperature.

  The properties of the silk fabric thus treated are

  collected in Table 1, Example 1.

  By way of comparison, an immersion bath containing 200 g / l of ethylene glycol-diglycidyl ether and 100 g / l of sodium chloride is prepared. The procedure of Example 1 is repeated except that this immersion bath is used in place of the other. The properties of the silk fabric are collated in Table 1, Comparison 1. The properties of the untreated silk fabric are

  collected in Table 1 under the control heading.

  As shown in the table, there is a significant change in the touch and noticeable wear in washing the untreated fabric. For the fabric treated with only the epoxy, the touch is strongly modified by becoming harder to wash. The difference of the folding resistances is greater than 4%. For the fabric treated according to the present invention, the change in the feel is very small; The fabric remains silky. It also exhibits satisfactory solubility, as well as satisfactory wash shrinkage and wear, as well as yellowness index and

  satisfactory wrinkling resistance.

Table 1

Touch Rigidity *

  Rigidity * Bending Strength ** Solubility Wear-Resistance Shrink

  auP folding __________________ Ap.L., I.j. Fractionality at Difference, Grade, Wash A.L.A.L. A.L., mm Ap.L., mm. Degrees Chain Weft Chain Weft Chain Weft Ex. 1 0j0172 00229 82 86 82 85 0 1, 1 4 13 20 251 1.6 Comp. 1 0.01810 0352 82 84 78 80 4.9 4.7 4 15 20 259 2, 1 Control 0.01480.0349 84 86 78 80 7? 1 6.9 2 21 88 230 4.0 AL: Before washing , Ap. L .: After washing *: High values indicate a harder feel ** *: Higher values indicate a softer touch

2649732.

Example 2

  An immersion bath is prepared with the following materials

  and water, at the following concentrations.

  - Epoxide: ethylene glycol (n = 13)

diglycidyl ether 200 g / l.

  - Silicone resin: Ultratex ESC (Ciba-Geigy) g / l. - Aminoplast Resin: Beckamine MA-S

(Dainippon Ink Corp.) 10 g / I.

  Catalyst for epoxide: sodium chloride g / l.

  - Catalyst for silicone resin: Ultratex Catalyst ZF (Ciba

Geigy) 5 g / l.

  Catalyst for Aminoplast Resin: Catalyst 376 (Dainippon)

Ink Corp.) 5 g / l.

  A silk fabric called Fuji Silk, with double twist warp yarns having a yarn count of 140 and double twist weft yarns having a yarn count of 140, is immersed in the above dip bath and squeezed at 72% using an expresser, then dried at 120 ° C. and parboiled at 170 ° C. for 60 minutes.

  seconds, in a hot-air dryer, with a string of pins.

  The fabric is then subjected to humidification and drying according to the invention and to a finishing operation according to

Example 1

  The properties of the silk fabric thus treated are

  collected in Table 2, Example 2.

  By way of comparison, an immersion bath containing 200 g / l of polyethylene glycol (n = 13) diglycidyl ether and g / l of sodium chloride is prepared. The procedure of Example 1 is repeated except that the latter immersion bath is used. The properties of the silk fabric are collated in Table 1, under Comparison 2. The properties of the untreated silk fabric are collated in Table 2 under control. Before washing, the fabric treated according to the present invention

2649732.

  a touch similar to that of the untreated fabric. The change of the touch and wear by washing are very small for the fabric

according to the invention.

Table 2

Touch Rigidity *

  Folding Bending Strength ** Solubility Wear-Resistance Shrink

  Ap.L., I.j. Fractionality at Difference, Grade, Wash A.L.A.L. A.L., mm Ap.L., m degrees% Chains Weft Chains Weft Chains wefts 2 0.01690 0231 83 85 82 84 1.2 1 1 4 14 20 252 158 Comp. 2 0 01900.0343 82 86 78 80 4X8 7.0 4 16 19 255 1; 8 Control 0.01560, 03221 85 85 77 74 9) 4 12.9 3 23 87 220 3) 3 AL: Before washing, Ap. L .: After washing *: Higher values indicate a harder feel ** .: High values indicate a softer feel

264973-2 -

Example 3

  An immersion bath is prepared with epoxy, diglyceryldiglycidyl ether, at a concentration of 200 g / l, sodium diethylenetriamine pentaacetate as catalyst

  for epoxy at 100 g / l, and water.

  A silk fabric called Fuji Silk, with double twist warp yarns having a yarn count of 120 and double twist weft yarns having a yarn count of 120, is immersed in the immersion bath herein. 74% wiped with an expresser, then dried at 120 ° C. and steamed at 170 ° C. for 60 minutes.

  seconds. This is called comparison 3.

  Another immersion bath is prepared with the materials

and water.

  - Silicone resins: Right Silicone A-500 (Kyoeisha Yushi Co., 20% content) 10 g / l, and Ultratex 7261

(Ciba-Geigy, 25% content) 15 g / l.

  - Glyoxal resin: Beckamine LFK (Dainippon

Ink Corp., 45% content) 15 g / l.

  Catalyst for silicone resin: Phobotone WS (Ciba-Geigy) g / l, and Ultratex Catalyst ZF (Ciba-Geigy) 5 g / l. Catalyst for glyoxal resin: Catalyst G (Dainippon)

Ink Corp.) 10 g / l.

  The fabric treated with the epoxide is immersed in the second immersion bath and squeezed at 70%, then dried at 120 ° C. and steamed at 170 ° C. for 1 minute in a hot-air drier with

  oar, and this fabric is called comparison 4.

  The fabric is immersed in water and passed through a short-loop dryer, semi-decapper and

  calenders as in Example 1, this being called Example 3.

  The properties of this fabric are summarized in Table 3 together with the properties of an untreated control fabric. As shown in the table, the silicone resin provides a silky feel and slight touch changes during washing. In addition, the low shrinkage in washing is obtained by

2649732.

  moistening the resin-treated fabric and drying under low tension.

Table 3

  Touch Bending Rigidity * Folding Strength **

  Solubility Wear-Resistance Shrink

  Ap.L., I.j. Fragmentality to A.L. Ap.L. AL, mm Ap.L., mm Difference, weary, wash ______ ______ ______ decres% chaine Weft Chat Weft Chain Weft Ex. 3 O) 0109 00181 86 86 84 84 2,4 2,3 4 15 18 263 2 2 Comp. 3 0> 0137 0 0307 84 82 79 78 6d 0 4.9 4 15 18 256 2.7 Comp. ## EQU1 ## FIG. 0301150i0312 85 85 73 76 14> 1 10> 6 2 - 3 25 78 242 3.9 A.L.:Before washing, Ap.L. After washing *: Higher values indicate a harder feel ** At higher values indicate a softer feel

2649732.

Example 4

  A Fuji Silk fabric, with double twisting warp and weft yarns, having a yarn count of 120, is immersed in a solution of 20 g / l of ethylene glycol diglycidyl ether, of 100 g / l of sodium chloride as catalyst for the epoxide and water, this solution being then heated to 90 C and maintained at this temperature for 60 minutes. After washing with water and drying, the fabric treated with the epoxide is immersed in a bath

  Immersion prepared with the following materials and water.

  - Silicone resin: Right Silicone A-500

  (Kyoeisha Yushi Co., 20% content) 5 g / l.

  - Glyoxal resin: Beckamine LFK (Dainippon

Ink Corp., 45% content) 10 g / l.

  Catalyst for glyoxal resin: Catalyst G (Dainippon)

Ink Corp.) 10 g / l.

  The fabric is dewatered to 70%, then dried at 120 ° C. and steamed at 160 ° C. for 90 seconds in a hot-air dryer with a ream with pins. The fabric is immersed in water and passed through a short loop dryer, semi-decapper and calenders, as in Example 1. The properties of the fabric are collated in Table 4 together with the properties.

an untreated control cloth.

Table 4

Touch Rigidity *

  Folding Bending Strength ** Solubility Wear-Resistance Shrink

  Ap.L., I. Fractional Difference, Grade Classification, Washing A. L. Ap.L. AL, mm Ap.L., mm% degrees% _ _ Chatne Chat Chat Weft ChaneFrame_ _ _ Ex. 4 0,0124,0201 85 84 83 83 234 1X2 4 14 18 258 1,9 Indicator 0) 01110> 0325 85 85 74 76 12.9 8.9 2 - 3 25 78 242 4.2 AL: Before washing, Ap.L .: After washing *: Higher values indicate a harder feel **: Higher values indicate a softer feel -oo LN M

2649732-

Claims (16)

CLAIMS.   A washable silk fabric treated with resins, characterized in that the fabric is treated with (a) an epoxy compound, (b) a silicone resin, and (c) an aminoplast resin and / or a glyoxal resin, and that the fabric has a solubility of 30% by weight or less when soaked in an aqueous solution at 5% by weight of sodium hydroxide, at a temperature of 65 C for minutes, a difference of 4% or less between the fold strengths in mm before and after 10 washes, and a narrowing at washing of 3% or less.   2. Washable silk fabric according to claim 1, characterized   In that the solubility is 20% by weight or less.   3. washable silk fabric according to claim 1, characterized in that the difference of the folding resistances is 3% or less. 4. Silk fabric according to claim 1, characterized in that   the wash shrinkage is 2.5% or less.   Washable silk fabric according to claims 1, 2, 3 or 4,   characterized in that the epoxy compound is selected from the group consisting of polyglycidyl ethers of ethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, glycerol, polyglycerol, phenol ethylene oxide and alcohol. lauric-ethylene oxide.   6. Washable silk fabric according to claim 1, 2, 3 or 4,   characterized in that the silicone resin is a silicone elastomer.   7. A washable silk fabric according to claim 1, 2, 3 or 4, characterized in that the aminoplast resin is selected from the group consisting of melamine-formalin resins, triazone formaldehyde resins, urea-formaldehyde resins, ethylene-formaldehyde resins, others to N-methylol resins, N-methylol ether resins and their mixtures, and that the glyoxal resin   is selected from the group consisting of dimethylol   dihydroxyethylene urea and tetramethylol acetylene diurea. 2649732.   A process for preparing a washable silk fabric, characterized by the steps wherein (a) an epoxy compound, (b) a silicone resin, and (c) an aminoplast resin and / or a glyoxal resin are applied together or separately in any order on a silk fabric, it being understood that the epoxy compound should not be applied last; after the application, said compound and said resins are fixed to the fabric leaving the silk fabric at rest at room temperature or by heating the silk fabric; in a final step, the silk fabric on which said (a), (b) and (c) have been applied and which is in the wet state, is   dried while still kept under low tension.   9. The method of claim 8, characterized in that said last step is conducted as a separate step after fixing of (a), (b) and (c); and that in said last step, the silk fabric is wetted with water or with an aqueous liquid and   then, hot-dried under said low voltage.   The method according to claim 8, characterized in that said last step is carried out as a step in which a last resin (b) or (c) is applied, alone or together with said (a), and / or the other resin (c) or (b), from a solution   or aqueous dispersion, and heat-dried under said low voltage.   He. A method according to claim 8, characterized in that said (a), (b) and (c) are applied together and fixed and then the silk fabric is moistened and dried under hot conditions. said low voltage.   12. The method of claim 8, characterized in that the epoxy compound (a) is applied and fixed first; resins (b) and (c) are applied together and fixed; and then, the stuff is   moistened and heat dried under said low voltage.   13. The method of claim 8, characterized in that the (a), (b) and (c) above are applied and fixed separately in this - order.   14. The method of claim 8, characterized in that the compounds (a), (b) and (c) above are fixed in the presence of catalyst. 2649732.   15. Process according to claim 8, characterized in that the   process is followed by a finishing operation.   16. The method of claim 15, characterized in that the finishing operation comprises the application of a softening agent, a calendering a fixing and / or calendering to steam.   17. The method of claim 8, characterized in that the tension is kept low by a pneumatic supply means of the silk fabric, without pulling the fabric of silk to feed the fabric in a drying device. continuous hot. 18. The method of claim 8, characterized in that the tension is kept low by adjusting the feed speed of the fabric in a hot-drying device 1 5 continuous.   19. The method of claim 17, characterized in that a short-loop dryer provided with said pneumatic supply is used.