US2993745A - Method of and compositions for bleaching in acid solutions - Google Patents
Method of and compositions for bleaching in acid solutions Download PDFInfo
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- US2993745A US2993745A US600400A US60040056A US2993745A US 2993745 A US2993745 A US 2993745A US 600400 A US600400 A US 600400A US 60040056 A US60040056 A US 60040056A US 2993745 A US2993745 A US 2993745A
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
- D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
- D06L4/20—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen
- D06L4/27—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen using organic agents
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- This invention relates to the bleaching of nylon, cellulosicmaterials, regenerated cellulosic materials and fibers or filaments of the polyesters while at the same time. inhibiting the degradation of suchv materials by the active bleaching chlorine, and to bleaching compositions which are effective inacid solutions and contain an inhibiting agent to prevent degradation of the materials mentioned while being bleached.
- Nylon ,par t-icularv is veryv diificult to bleach and -is degraded by alkaline bleaching compounds
- acid solution agents inhibiting degradation by the active or bleachingchlgrine are very.'destructiveof the type ofmaterials 30 abgve mntioned.
- an inhibiting agent selected from theniolecularly de
- the concentration may be made lower than that or higher depending upon the amount of the bleaching agenteither trichlorocyanuric acid or dichlorocyanuric acid, required.
- an inhibiting agent selected from the group of the molecularly dehydrated phosphates above mentioned may be added in amount sufficient to prevent degradation;
- the amount of molecularly dehydrated phosphate added may vary from about. 1,000 ppm. to approximately 400,000 ppm. In any case the molecularly dehydrated phosphate added could vary from twenty-five pounds to sixty or seventy pounds per 100 pounds of water;
- acidifying agents may be added in order toinsure that the pH thereof will be below 7, preferably in the range from about 4.5 to 6.9.
- Another object of the invention is to provide an eifecting bleachingcomposition in which the efiective or essential bleaching agent is selected from the class consisting of trichlorocyanuric acid and dichlorocyanuric acid and in which; the inhibiting agent is a molecularly dehydrated phosphate selected from the group consisting of the alkali metal phosphate glasses above mentioned and the alkali ditions of storage and transportation and which when dissolved in water will yield solutions suitable for bleaching, sterilizing and disinfecting and particularly for the bleaching of materials such as nylon, cellulosic materials, regenerated cellulosic materials and fibers or filaments of the polyesters.
- the efiective or essential bleaching agent is selected from the class consisting of trichlorocyanuric acid and dichlorocyanuric acid and in which; the inhibiting agent is a molecularly dehydrated phosphate selected from the group consisting of the alkali metal phosphate glasses above mentioned and the alkali ditions of storage and transportation and
- compositions as above set forth which is useful as a disinfecting detergent for laundry and other purposes, as a bleaching detergent composition for laundry and other purposes where protection against degradation of the bleached fabrics is essential.
- a bleaching' composition embodying the invention may be preparedby mixing a compoundof the group consisting of tn'chlorocyanuric acid and dichlorocyanuric acid and an agent that is effective to inhibit degradation of the materials suchas nylon, cellulosic materials, regenerated cellulosic materials and fibers or filaments of the polyesters.
- the trichlorocyanuric acid and the dichlorocyanuric acid are available having a high available active chlorine content. If these materials have percent available chlorine, approximately 1.12 pounds thereof in pounds of water will yield about 1 percent available chlorine.
- 'For the ordinary composition that would be used in the household, it would' contain sufiicient of the active acidic;bleaching agent to provide about 1 percent available ehlorine,-. and. sufiicient inhibitinguagent to 'in the presence of the active bleaching agent.
- composition which prevents degradation of the above mentioned materials will be such as to effectively achieve that result, namely the prevention of degradation.
- compositions in general may consist of the active bleaching agent-either the trichlorocyanuric acid or I the dichlorocyanuric acid, a molecularly dehydrated phosphate, an acidifying agent and a filler or neurtal material to give it bulk so that the composition may be used with economy and in the concentrations desired without accurate measurement.
- the acidifying agents may be selected from among the compounds such as sodium bisulphate, acetic acid, diacetic acid, sodium diacetate, citric acid, sulfamic acid and oxalic acid.
- the acidifying agents may also include monoalkali metal dihydrogen phosphate such as the sodium and potassium dihydrogen phosphate.
- composition as above stated will contain a molecularly dehydrated phosphate selected from the group of phosphates above described.
- a molecularly dehydrated phosphate selected from the group of phosphates above described.
- the crystalline alkali metal molecularly dehydrated phosphates are preferred to the molecularly dehydrated glassy phosphates;
- the active bleaching agent i.e. either trichlorocyanuric acid or dichlorocyanuric acid
- the detergent shall be'one that is operative in acid solution, and which does not when in the composition, deteriorate in storage, cause the acidic bleaching agent to break down or which will not itself decompose
- Petro AA which is an alkyl naphthalene sulfonate, in powder form 98 percent active, to be well suited for the formulation of the bleachingdeterg'ent composition as it provides a product that is stable in storage, has a long shelf life, remains free-flowing and does not deleteriously affect the active bleaching agent.
- Example 1 22.5 parts by weight of trichlorocyanuric acid 85 percent active p 50 parts by weight sodium tripolyphosphate (Na P O 27.5 parts by weight sodium sulfate 4 Y A one percent solution of the composition of Example II in tap water will have a pH of about 5.8 and will provide an available chlorine content in a bleaching solution of about percent. This composition is useful in industrial sanitizing applications and for heavy duty bleaching.
- Example III 11 parts by weight trichlorocyanuric acid 85 percent available chlorine 20 parts by weight sodium tripolyphosphate 15 parts by weight monosodium dihydrogen phosphate 54 parts by weight sodium sulfate
- the pH of a one percent solution in tap water of the above Example III is about 6.1, the tap water having a pH of about 8.2.
- the composition will provide an available chlorine content in the bleaching solution of about 10 percent.
- 1 pound of The pH of a one percent tap water solution of the above composition is 6.5 where the tap water itself had a pH ofv about 8.2.
- the composition of Example I will provide an available chlorine content in a bleaching solution of 19.125 or approximately 20 percent where 100 parts by weight of the composition is used in 100 partsby weight of water.
- Example I Thecomposition of Example I is' suitable for commercial bleaching applications such as'are encountered in commercial laundries.
- Example 11 7 percent 1 active chlorine the trichlorocyanuric acid percent available active bleaching chlorine will provide .85 percent of available chlorine in the solution.
- the above composition is useful in heavy duty bleach ing and in industrial sanitizing applications.
- Petro AA is an alkyl naphthalene sulfonate 98 percent active and is a powder.
- the pH of a 1 percent solution in tap water of Example IV is about 6.2 and it will provide an available chlorine content in aqueous solution of about 7 percent when suflicient of the composition is added to the solution to provide approximately 8 parts by weight of the trichlorocyanuric acid for each 100 parts by w'eightof water.
- dichloro-cyanuric acid may besubstituted for the'trichlorocyanuric acid in substantially the same proportions by weight.
- the dichlorocyanu'ricacid has about 65% to" 70% available chlorine according to the technical literature of manufacturers of that product. 1
- an acidifying agent selected from the group consisting of sodium bisulfate, acetic acid, diacetic acid, sodium diacetate, citric acid, sulfamic acid and oxalic acid may be added to the compositions to insure that the solutions of the, compositions will be acidic in use and provide a pH in'the bleaching solutions ranging from pH about 4.5 to about 6.9. ,It is preferred that the pH range be maintained between 5.5 and 6.1.
- Sodium bicarbonate may be effectively used with the acidifying agent.
- the proportions of the trichlorocyanuric acid and the dichloro-oyanuric acid used in the compositions mayyary from about 8 parts by weight to about,22.5 partslby weight.
- the upper concentration in parts by weight of the trichlorocyanuric acid or the dichloro-cyanuric acid duty .a bleaching composition.
- the bleach bath contained 0.1% sodium Lorol sulfate and 1.13% trichlorocyanuric acid.
- the bleach bath was at a temperature of 70 C., and the bleach cycle was two hours.
- the method of bleaching fibers and filaments of nylon, cellulose, regenerated cellulose, and polyesters which consists of preparing an aqueous solution of an active bleaching agent of the group consisting of trichlorocyanmic acid and dichlorocyanuric acid in amount suflicient to provide about 1% to about 25% of available chlorine, and a degradation inhibiting agent selected from the class of phosphate consisting of alkali metal molecularly dehydrated phosphate glass, alkali metal tripolyphosphate and alkali metal pyrophosphate, including alkali metal acid pyrophosphate, adjusting the pH of the solution to a value from about pH 4 to 6.9, soaking the materials to be bleached in the solution, rinsing, and removing the materials from the bleach and drying the same.
- an active bleaching agent of the group consisting of trichlorocyanmic acid and dichlorocyanuric acid in amount suflicient to provide about 1% to about 25% of available chlorine
- a degradation inhibiting agent selected
- a bleaching composition for bleaching in acid solution fibers and filaments of nylon, cellulose, regenerated cellulose and polyesters which comprises:
- a bleaching composition comprising:
- a bleaching and detergent composition comprising v A composition asin c1ai1 n 6 containing an acidify- 8' 6 25% byjwei' ht at; bleaching a ent ⁇ of the roup i i age t in amend; sum cieii to maint in the pHQof a consistingoftriclilorocyaiinric acid 'dichldfocya'niific 1%" soh'l'tioii' of the compbsitldfi between 4.5 and 6.5.
Description
United States Patent 2,993,745 METHOD OF AND COMPOSITIONS FOR BLEACHING IN ACID SOLUTIONS Rowell R. Dorsett, Baltimore, Md., assiguor of one-half 5 to Mangels, Herold Company, Inc., Baltimore, Md., a corporation No Drawing. Filed July 27, 1956, Ser. No. 600,400
7 Claims. (Cl. 8-108) This invention relates to the bleaching of nylon, cellulosicmaterials, regenerated cellulosic materials and fibers or filaments of the polyesters while at the same time. inhibiting the degradation of suchv materials by the active bleaching chlorine, and to bleaching compositions which are effective inacid solutions and contain an inhibiting agent to prevent degradation of the materials mentioned while being bleached.
This application is a; continuation-in-part ofv my copending application Serial No. 517,069, :filed June 21, 1955, nowabandoned.
Materials such as nylon, cellulosic materials, regenerated cellulosic materials and fibers or filaments of-the polyesters are very sensitive to bleaching agents and are degraded-bythem. Nylon ,par t-icularv is veryv diificult to bleach and -is degraded by alkaline bleaching compounds There are compounds available which yield-activeorbleaching' chlorine in both alkaline and acid soluti9ns,- Butthe se compounds if not. usedin acid solution agents inhibiting degradation by the active or bleachingchlgrine, are very.'destructiveof the type ofmaterials 30 abgve mntioned.
I have found that trichlorocyanuric acid and dichlord cyanu ric acid whenused in alkaline solutions will degrade jniaterials-such as;nylon, cellulosic materials, regenerated m thod of bleaszhinsu g c u o i' jt i f i e l 'ated celiulesie materialrand fibers or'filaments' offthe. polyesters in an acidic ,solutioncontaining as the active bleach- "mg a ent riclilbro cyanuric acid'ordichlorocyanuric acid, anil an inhibiting agent selected from theniolecularly deh fated phosphates of-the group consisting ofthe alkali 'diltal' phosphate-glasse's ih whichttheratio of M 010 R 0 eam-0:51 lito abdut: 1.7:: 1, "where M'zis sodium, potasinsium; orizarnmoniu m andi-the c riystallineualkalimetal moleeularly; dehydratedphosphates {such as the sodium; or potassium n s p ph es: ('jNasle m rK 3010) i 1 uit-reta ium: PY PJ QSPh a tiai a q. and Kin-201 a l?.iher mdilqsmi aid Pv e ,Pha i i-(Naeflz aQ'r ml; 2 2P2 Q- I11 .p par' 'ng. il
"leaching solutiori stifii'cient oft-he bleachin agent, ther trich acid is added "of available ob to be etcii d'i b t a new 'complished; For" the ordinary domesti V bleaching the concentration of availableehionne may be "or nausea-01d T 9 Patented July 2 5, 1961 ice of the order of one percent. For heavy duty bleaching suchas encountered in commercial laundries the amount of the bleaching agent added may be such as will provide in the bleaching solution a concentration of from 500 p.p.m. to 250,000 ppm. of available chlorine. The concentration may be made lower than that or higher depending upon the amount of the bleaching agenteither trichlorocyanuric acid or dichlorocyanuric acid, required. To protect the materials bleached from degradation by the active or bleaching chlorine, an inhibiting agent selected from the group of the molecularly dehydrated phosphates above mentioned, may be added in amount sufficient to prevent degradation; The amount of molecularly dehydrated phosphate added may vary from about. 1,000 ppm. to approximately 400,000 ppm. In any case the molecularly dehydrated phosphate added could vary from twenty-five pounds to sixty or seventy pounds per 100 pounds of water;
To the bleaching solution acidifying agents may be added in order toinsure that the pH thereof will be below 7, preferably in the range from about 4.5 to 6.9.
Another object of the invention is to provide an eifecting bleachingcomposition in which the efiective or essential bleaching agent is selected from the class consisting of trichlorocyanuric acid and dichlorocyanuric acid and in which; the inhibiting agent is a molecularly dehydrated phosphate selected from the group consisting of the alkali metal phosphate glasses above mentioned and the alkali ditions of storage and transportation and which when dissolved in water will yield solutions suitable for bleaching, sterilizing and disinfecting and particularly for the bleaching of materials such as nylon, cellulosic materials, regenerated cellulosic materials and fibers or filaments of the polyesters.
Other objects of the invention are to provide a composition as above set forth which is useful as a disinfecting detergent for laundry and other purposes, as a bleaching detergent composition for laundry and other purposes where protection against degradation of the bleached fabrics is essential. I
The above and other objects of the invention will be apparent to those 'or ordinary skill in the art to which the invention pertains from the following description.
A bleaching' composition embodying the invention may be preparedby mixing a compoundof the group consisting of tn'chlorocyanuric acid and dichlorocyanuric acid and an agent that is effective to inhibit degradation of the materials suchas nylon, cellulosic materials, regenerated cellulosic materials and fibers or filaments of the polyesters. The trichlorocyanuric acid and the dichlorocyanuric acid are available having a high available active chlorine content. If these materials have percent available chlorine, approximately 1.12 pounds thereof in pounds of water will yield about 1 percent available chlorine. 'For the ordinary composition that would be used in the household, itwould' contain sufiicient of the active acidic;bleaching agent to provide about 1 percent available=ehlorine,-. and. sufiicient inhibitinguagent to 'in the presence of the active bleaching agent.
22.5 parts by weight trichlorocyanuricacid 85 :.30 parts by weight sodium tripolyphosphate 3:0 parts by weight rnonosodium dihydrogen phosphate 17.5parts' by weight sodium phosphate glass I prevent degradation of the fabrics bleached in the solution. For the ordinary domestic or household use the of available or active chlorine, the amount of agent. in
the composition which prevents degradation of the above mentioned materials will be such as to effectively achieve that result, namely the prevention of degradation.
The compositions in general may consist of the active bleaching agent-either the trichlorocyanuric acid or I the dichlorocyanuric acid, a molecularly dehydrated phosphate, an acidifying agent and a filler or neurtal material to give it bulk so that the composition may be used with economy and in the concentrations desired without accurate measurement.
The acidifying agents may be selected from among the compounds such as sodium bisulphate, acetic acid, diacetic acid, sodium diacetate, citric acid, sulfamic acid and oxalic acid. The acidifying agents may also include monoalkali metal dihydrogen phosphate such as the sodium and potassium dihydrogen phosphate.
The composition as above stated will contain a molecularly dehydrated phosphate selected from the group of phosphates above described. For storage purposes, that is stability in storage, the crystalline alkali metal molecularly dehydrated phosphates are preferred to the molecularly dehydrated glassy phosphates;
The active bleaching agent i.e. either trichlorocyanuric acid or dichlorocyanuric acid, maybe'used to form'a bleaching detergent composition also. In such a composition, the detergent shall be'one that is operative in acid solution, and which does not when in the composition, deteriorate in storage, cause the acidic bleaching agent to break down or which will not itself decompose I have found that Petro AA which is an alkyl naphthalene sulfonate, in powder form 98 percent active, to be well suited for the formulation of the bleachingdeterg'ent composition as it provides a product that is stable in storage, has a long shelf life, remains free-flowing and does not deleteriously affect the active bleaching agent.
The following are examples of the bleaching'composition:
Example 1 22.5 parts by weight of trichlorocyanuric acid 85 percent active p 50 parts by weight sodium tripolyphosphate (Na P O 27.5 parts by weight sodium sulfate 4 Y A one percent solution of the composition of Example II in tap water will have a pH of about 5.8 and will provide an available chlorine content in a bleaching solution of about percent. This composition is useful in industrial sanitizing applications and for heavy duty bleaching.
Example III 11 parts by weight trichlorocyanuric acid 85 percent available chlorine 20 parts by weight sodium tripolyphosphate 15 parts by weight monosodium dihydrogen phosphate 54 parts by weight sodium sulfate The pH of a one percent solution in tap water of the above Example III is about 6.1, the tap water having a pH of about 8.2. The composition will provide an available chlorine content in the bleaching solution of about 10 percent. In computing the available chlorine content in the solution it is to be remembered that 1 pound of The pH of a one percent tap water solution of the above composition (Example I) is 6.5 where the tap water itself had a pH ofv about 8.2. The composition of Example I will provide an available chlorine content in a bleaching solution of 19.125 or approximately 20 percent where 100 parts by weight of the composition is used in 100 partsby weight of water.
Thecomposition of Example I is' suitable for commercial bleaching applications such as'are encountered in commercial laundries.
Example 11 7 percent 1 active chlorine the trichlorocyanuric acid percent available active bleaching chlorine will provide .85 percent of available chlorine in the solution.
The above composition is useful in heavy duty bleach ing and in industrial sanitizing applications.
Example IV As stated supra Petro AA is an alkyl naphthalene sulfonate 98 percent active and is a powder.- I
The pH of a 1 percent solution in tap water of Example IV is about 6.2 and it will provide an available chlorine content in aqueous solution of about 7 percent when suflicient of the composition is added to the solution to provide approximately 8 parts by weight of the trichlorocyanuric acid for each 100 parts by w'eightof water.
In the foregoing examples dichloro-cyanuric acid may besubstituted for the'trichlorocyanuric acid in substantially the same proportions by weight. The dichlorocyanu'ricacid has about 65% to" 70% available chlorine according to the technical literature of manufacturers of that product. 1
Furthermore, in the foregoing examples an acidifying agent selected from the group consisting of sodium bisulfate, acetic acid, diacetic acid, sodium diacetate, citric acid, sulfamic acid and oxalic acid may be added to the compositions to insure that the solutions of the, compositions will be acidic in use and provide a pH in'the bleaching solutions ranging from pH about 4.5 to about 6.9. ,It is preferred that the pH range be maintained between 5.5 and 6.1. I
Sodium bicarbonate may be effectively used with the acidifying agent. i i
From the foregoing examples it will be apparent that the proportions of the trichlorocyanuric acid and the dichloro-oyanuric acid used in the compositions mayyary from about 8 parts by weight to about,22.5 partslby weight. The upper concentration in parts by weight of the trichlorocyanuric acid or the dichloro-cyanuric acid duty .a bleaching composition.
Unbleached Warp Filling Strength in pounds on Scott Tester 80 Solution containing 500 parts per million oi trichlorocyenuric acid solutionadjusted topH of about 5.5-goods bleached 30 minutes at 160 F- Solution containing 500 parts per million of trichlorocyenuric acid and a 20% solution of monosodium dihydrogen phosphate the solution ,ad usted to pH of, about .5.6.goods bleached. 30 minutes at 160 F Bleaching solution of calcium oxichloritc (0210 C1) 500 parts per million in solution pH 9.6-goods bleached 30 minutes at 160 F The tests of the above tests show the initial strength of the unbleached goods, the loss in strength of the warp and the filling where the trichlorocyanunic acid did not contain a phosphate, the strength after bleaching with phosphate in solution, the value showing only an insignificant loss in strength on the warp and the filling.
The loss in strength resulting from the use of calcium oxychloride was very significant and substantial.
The following shows the results of bleaching useyellowed nylon garments in solution containing the trichlorocyanuric acid and sodium Lorol sulfate. The bleach bath contained 0.1% sodium Lorol sulfate and 1.13% trichlorocyanuric acid. The bleach bath was at a temperature of 70 C., and the bleach cycle was two hours.
A set of seven (7) use-discolored fabrics having an average yellowness of 7.1 +b units as measured on a differential colorimeter had an average yellowness of 3.1 +b units after bleaching in the above solution. This is an acceptable shade of whiteness.
In another test the following use-yellowed nylon garments having the +b value of whiteness indicated were bleached in a solution containing about 1.13% by weight of the tn'chlorocyamiric acid.
Garment +b Value After bleaching +b Value After bleaching, the blouse having the +b value of 2.5 had a reflectance b value of 2.5. The average +b values for the other garments was approximately 3.06.
, 6 acid was present in each oi? the following in amount suflicient to .yield about 1% available chlorine.
NB-rSO4, NanHzPror Na dlacetate NarS04, Oalgon, benzoic acid NazHzPro'l, synthetic detergent Acetic acid 7 N a Lcrol" sulfate (0.2%), Acetic acid.
Similar tests have indicated that similar results are obtainable by the employment of dichlorocyanuric acid m lieu of trichlorocyanuric acid. .Froni the vforegping it is apparent that a process has been provided whereby material such as nylon, cellulosic materials, regenerated cellulosic materials and fibers or filaments of the polyesters may be bleached or washed and bleached eifectively and safely in acidic solutions containing trichlorocyanuric acid or dichlorocyanuric acid without suffering any substantial loss of strength through degradation.
It is also apparent that elfective bleaching compositions which are inhibited against the degradation of the above mentioned materials, including bleaching and detengent compositions having the same properties has been provided.
Having thus described the invention it will be apparent to those of ordinary in the art to which the invention pertains that various modifications and changes may be made in the described method and the examples of the compositions without departing from either the spirit or the scope of the invention.
Therefore, what is claimed as new and desired to be secured by Letters Patent is:
l. The method of bleaching fibers and filaments of nylon, cellulose, regenerated cellulose, and polyesters which consists of preparing an aqueous solution of an active bleaching agent of the group consisting of trichlorocyanmic acid and dichlorocyanuric acid in amount suflicient to provide about 1% to about 25% of available chlorine, and a degradation inhibiting agent selected from the class of phosphate consisting of alkali metal molecularly dehydrated phosphate glass, alkali metal tripolyphosphate and alkali metal pyrophosphate, including alkali metal acid pyrophosphate, adjusting the pH of the solution to a value from about pH 4 to 6.9, soaking the materials to be bleached in the solution, rinsing, and removing the materials from the bleach and drying the same.
2. The method of claim 1 in which the pH of the solution is maintained between pH 5 and pH 6.2 by monoalkali metal dihydrogen phosphate.
3. A bleaching composition for bleaching in acid solution fibers and filaments of nylon, cellulose, regenerated cellulose and polyesters which comprises:
(a) An -8 to 25 by weight acid bleaching compound of the class consisting of tn'chlorocyanuric acid and dichlorocyanuric acid computed on an available chlorine basis,
(b) Alkali metal molecularly dehydrated phosphate 25 to 50 percent by weight, and
(c) The balance consisting of a compound selected from the group consisting of sodium sulfate, and monoallcali metal dihydrogen phosphate.
4. A bleaching composition comprising:
(a) Trichlorocyanuric acid (85% available chlorine) 8 to 22.5 percent by weight,
(b) Alkali metal molecularly dehydrated phosphate 25 to 50 percent by weight, and
(c) Ari acidifying agent in amount suflicient to maintain a 1% solution of the composition at a pH value from 4.5 to about 6.5.
5. A bleaching and detergent composition comprising v A composition asin c1ai1 n 6 containing an acidify- 8' 6 25% byjwei' ht at; bleaching a ent} of the roup i i age t in amend; sum cieii to maint in the pHQof a consistingoftriclilorocyaiinric acid 'dichldfocya'niific 1%" soh'l'tioii' of the compbsitldfi between 4.5 and 6.5. acid computed on an 85% available @5555 Ha sis ,'a'fid v i; I w: mole'cillal'ly dehydrated phosphate 25 to 50 percent by 5 Reflences Cited in the tile of th is patent weight and a detergent consisting about 15% by weight 7 N Efi" ST PATEN i 98% active the balance 1-,s912,s4s Feibelnta'nn Dec. 27, 1932: conslstlng of actdrfmngagents. a o 2075 9113. San h v v I V 61 1937 -6. A bleaching'composition' for nylon; cellulosic and" 2121501 H g: 1938: sirnilar materials; having as its active bleaching agenta: 10 2166362 53 compound of the class consisting of trichlorocyanuric 1 1 i and dichlorocyanuric acids and a degradation inhibiting et """"f'"f"J ep 1947 agent selected from the" class of alkali metal molecu 25781270 3 6 9 1951 1am dehydrated phos'in'hatefglasses', the crystallinetrh 2,607,738 1 p'olypliosphates and the crystallinepyrophosphatesy the 15 6111700 1 z 17932 ratio of the bleaching agent computed on an"85%"a\ lai1 runner et able chlorine basis to inhibiting agent" percent ,by 'b E E S Weight being in the crange'of 8z2ifl to 25:50; and having 1 I s- H a pHin 10% solution'between s and 6: 406,431 Italy 23, 19
Claims (1)
1. THE METHOD OF BLEACHING FIBERS AND FILAMENTS OF NYLON, CELLULOSE, REGENERATED CELLULOSE, AND POLYESTERS WHICH CONSISTS OF PREPARING AN AQUEOUS SOLUTION OF AN ACTIVE BLEACHING AGENT OF THE GROUP CONSISTING OF TRICHLOROCYANURIC ACID AND DICHLOROCYANURIC ACID IN AMOUNT SUFFICIENT TO PROVIDE ABOUT 1% TO ABOUT 25% OF AVAILABLE CHLORINE, AND A DEGRADATION INHIBITING AGENT SELECTED FROM THE CLASS OF PHOSPHATE CONSISTING OF ALKALI METAL MOLECULARLY DEHYDRATED PHOSPHATE GLASS, ALKALI METAL TRIPOLYPHOSPHATE AND ALKALI METAL PYROPHOSPHATE, INCLUDING ALKALI METAL ACID PYROPHOSPHATE, ADJUSTING THE PH OF THE SOLUTION TO A VALUE FROM ABOUT PH 4 TO 6.9, SOAKING THE MATERIALS TO BE BLEACHED IN THE SOLUTION, RINSING, AND REMOVING THE MATERIALS FROM THE BLEACH AND DRYING THE SAME.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US600400A US2993745A (en) | 1956-07-27 | 1956-07-27 | Method of and compositions for bleaching in acid solutions |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US600400A US2993745A (en) | 1956-07-27 | 1956-07-27 | Method of and compositions for bleaching in acid solutions |
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| US2993745A true US2993745A (en) | 1961-07-25 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3142530A (en) * | 1961-05-04 | 1964-07-28 | Wyandotte Chemicals Corp | Method of bleaching cotton fabrics with nu, nu'-dichloro-2, 5-diketopiperazines |
| US3213029A (en) * | 1962-02-21 | 1965-10-19 | Monsanto Co | Granular compositions containing trichlorocyanuric acid |
| US3289887A (en) * | 1962-07-31 | 1966-12-06 | Colgate Palmolive Co | Dispensing of reactive cleansing materials |
| US3293188A (en) * | 1956-09-10 | 1966-12-20 | Procter & Gamble | Preparation of dichlorocyanurate, sodium tripolyphosphate and sodium sulfate containing bleaching, sterilizing and disinfecting composition |
| US4242215A (en) * | 1972-06-13 | 1980-12-30 | Chem-Y, Fabriek Van Chemische Produkten B.V. | Substantially environmental-pollution-free laundry detergent composition |
| US20060111261A1 (en) * | 2004-11-19 | 2006-05-25 | The Procter & Gamble Company | Acidic laundry detergent compositions |
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| US2171901A (en) * | 1937-07-03 | 1939-09-05 | Rare Metal Products Company | Process of vulcanizing rubber |
| US2422255A (en) * | 1944-04-14 | 1947-06-17 | Du Pont | Rinse compositions |
| US2578270A (en) * | 1949-09-23 | 1951-12-11 | Pittsburgh Plate Glass Co | Stable chlorinated melamine composition |
| US2607738A (en) * | 1948-06-25 | 1952-08-19 | Monsanto Chemicals | Bleaching, sterilizing, disinfecting, and deterging compositions |
| US2611700A (en) * | 1949-12-30 | 1952-09-23 | Gen Aniline & Film Corp | Regeneration of exhausted silver bleach solutions by means of n-bromo compounds |
-
1956
- 1956-07-27 US US600400A patent/US2993745A/en not_active Expired - Lifetime
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1892548A (en) * | 1930-04-20 | 1932-12-27 | Feibelmann Richard | Compound and process for treating vegetable and animal fibers and fabrics |
| US2075913A (en) * | 1934-06-11 | 1937-04-06 | Sanchez Pedro | Bleaching compound |
| US2121501A (en) * | 1936-03-17 | 1938-06-21 | Oakite Prod Inc | Hypochlorite composition |
| US2171901A (en) * | 1937-07-03 | 1939-09-05 | Rare Metal Products Company | Process of vulcanizing rubber |
| US2166362A (en) * | 1937-11-15 | 1939-07-18 | Mathieson Alkali Works Inc | Stable calcium hypochlorite composition |
| US2422255A (en) * | 1944-04-14 | 1947-06-17 | Du Pont | Rinse compositions |
| US2607738A (en) * | 1948-06-25 | 1952-08-19 | Monsanto Chemicals | Bleaching, sterilizing, disinfecting, and deterging compositions |
| US2578270A (en) * | 1949-09-23 | 1951-12-11 | Pittsburgh Plate Glass Co | Stable chlorinated melamine composition |
| US2611700A (en) * | 1949-12-30 | 1952-09-23 | Gen Aniline & Film Corp | Regeneration of exhausted silver bleach solutions by means of n-bromo compounds |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3293188A (en) * | 1956-09-10 | 1966-12-20 | Procter & Gamble | Preparation of dichlorocyanurate, sodium tripolyphosphate and sodium sulfate containing bleaching, sterilizing and disinfecting composition |
| US3142530A (en) * | 1961-05-04 | 1964-07-28 | Wyandotte Chemicals Corp | Method of bleaching cotton fabrics with nu, nu'-dichloro-2, 5-diketopiperazines |
| US3213029A (en) * | 1962-02-21 | 1965-10-19 | Monsanto Co | Granular compositions containing trichlorocyanuric acid |
| US3289887A (en) * | 1962-07-31 | 1966-12-06 | Colgate Palmolive Co | Dispensing of reactive cleansing materials |
| US4242215A (en) * | 1972-06-13 | 1980-12-30 | Chem-Y, Fabriek Van Chemische Produkten B.V. | Substantially environmental-pollution-free laundry detergent composition |
| US20060111261A1 (en) * | 2004-11-19 | 2006-05-25 | The Procter & Gamble Company | Acidic laundry detergent compositions |
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