Laundry detergent sheet with microcapsules

Abstract

A non-fibrous laundry detergent sheet having friable microcapsules can clean and impart freshness to laundry.

What is claimed is: 
     
         1 . A non-fibrous laundry detergent sheet comprising:
 (a) at least one surfactant;   (b) at least one film former; and   (c) a friable microcapsule;
 wherein the laundry detergent sheet is completely or substantially water-soluble, wherein said laundry detergent sheet has a thickness ranging from 0.1 mm to 10 mm, a length-to-thickness aspect ratio of at least 5:1, and a width-to-thickness aspect ratio of at least 5:1. 
   
     
     
         2 . The non-fibrous laundry detergent sheet of  claim 1 , wherein the friable microcapsule is a friable perfume microcapsule; preferably wherein a shell wall of the perfume microcapsule comprises comprising a material selected from the group consisting of polyethylenes, polyamides, polystyrenes, polyisoprenes, polycarbonates, polyesters, polyacrylates, aminoplasts, or combination thereof; more preferably wherein the non-fibrous laundry detergent sheet comprises from 0.1% to 10%, preferably from 0.5% to 7%, alternatively from 1% to 6%, of the friable microcapsule by weight of the non-fibrous laundry detergent sheet. 
     
     
         3 . The non-fibrous laundry detergent sheet of  claim 1 , wherein a shell of the friable microcapsule is coated by a water-soluble cationic polymer, preferably wherein the water-soluble cationic polymer is selected from the group that consists of polysaccharides, cationically modified starch and cationically modified guar, polysiloxanes, dimethyldiallylammonium polyhalogenides, copolymers of dimethyldiallylammonium polychloride and vinyl pyrrolidone, acrylamides, imidazoles, imidazolinium halogenides and imidazolium halogenides and polyvinyl amine and its copolymers with N-vinyl formamide. 
     
     
         4 . The non-fibrous laundry detergent sheet according to  claim 1 , wherein said at least one surfactant is present in an amount ranging from 5% to 90%, preferably from 20% to 90%, more preferably from 30% to 90%, and most preferably from 50% to 90%, by total weight of such non-fibrous laundry detergent sheet. 
     
     
         5 . The non-fibrous laundry detergent sheet according to  claim 1 , comprising one or more anionic surfactants selected from the group consisting of C 6 -C 20  linear alkylbenzene sulfonates (LAS), C 6 -C 20  linear or branched alkyl sulfates (AS), C 6 -C 20  linear or branched alkylalkoxy sulfates (AAS) having a weight average degree of alkoxylation ranging from 0.1 to 10, and combinations thereof. 
     
     
         6 . The non-fibrous laundry detergent sheet according to  claim 1 , comprising: (1) one or more C 6 -C 18  linear or branched AS surfactants as the main surfactant(s); and (2) one or more C 6 -C 20  LAS and/or C 6 -C 20  linear or branched AAS as co-surfactant(s), wherein said main surfactant(s) are present in an amount that is greater than 50% by total weight of all surfactants in said sheet, and wherein said one or more C 6 -C 18  linear or branched AS surfactants are preferably C 12 -C 14  linear or branched AS surfactants. 
     
     
         7 . The non-fibrous laundry detergent sheet according to  claim 1 , comprising: (1) one or more C 6 -C 20  LAS surfactants as the main surfactant(s); and (2) one or more C 6 -C 18  linear or branched AS and/or C 6 -C 20  linear or branched AAS as co-surfactant(s), wherein said main surfactant(s) are present in an amount that is greater than 50% by total weight of all surfactants in said sheet. 
     
     
         8 . The non-fibrous laundry detergent sheet according to  claim 1 , further comprising one more nonionic surfactants in an amount ranging from 1% to 40%, preferably from 2% to 30%, more preferably from 5% to 25%, and most preferably from 10% to 20%, by total weight of such non-fibrous laundry detergent sheet, wherein said one or more nonionic surfactants is preferably selected from the group consisting of alkyl alkoxylated alcohols and combinations thereof. 
     
     
         9 . The non-fibrous laundry detergent sheet according to  claim 1 , wherein said at least one film former is present in an amount ranging from 1% to 70%, preferably from 2% to 60%, more preferably from 5% to 50%, and most preferably from 10% to 40%, by total weight of such non-fibrous laundry detergent sheet; wherein said at least one film former comprises one or more water-soluble polymers; wherein preferably said one or more water-soluble polymers are selected from the group consisting of polyalkylene glycols, polyvinyl alcohols, starch or modified starch, cellulose or modified cellulose, polyacrylates, polymethacrylates, polyacrylamides, polyvinylpyrrolidones, and combinations thereof; wherein more preferably said one or more water-soluble polymers are selected from the group consisting of polyethylene glycols, polyvinyl alcohols, starch or modified starch, cellulose or modified cellulose, and combinations thereof. 
     
     
         10 . A method of making a non-fibrous laundry detergent sheet comprising the step of dispensing a microcapsule to a precursor non-fibrous laundry detergent sheet, wherein the precursor non-fibrous laundry detergent sheet comprises: (a) at least one surfactant; (b) at least one film former; and (c) a thickness ranging from 0.1 mm to 10 mm. 
     
     
         11 . The method of  claim 10 , wherein the microcapsule is dispensed as a microcapsule slurry, preferably wherein the microcapsule is a friable microcapsule, more preferably wherein the friable microcapsule is a friable perfume microcapsule, yet more preferably wherein a shell wall of the perfume microcapsule comprises comprising a material selected from the group consisting of polyethylenes, polyamides, polystyrenes, polyisoprenes, polycarbonates, polyesters, polyacrylates, aminoplasts, or combination thereof. 
     
     
         12 . The method of  11 , wherein the microcapsule slurry comprises:
 (a) less than 75% water, preferably from 5% to 50% water, alternatively from 20% to 75% water, by weight of the microcapsule slurry; and   (b) a structurant, preferably the structurant is selected form salts, polymers, or combinations thereof.   
     
     
         13 . The method according to  claim 10 , wherein the microcapsule slurry is heated within at least about ±30° C., preferably ±20° C., preferably ±10° C. of the temperature of precursor laundry detergent sheet to which the microcapsule slurry is dispense thereto;
 preferably the microcapsule slurry is at a temperature from 50° C. to 100° C., preferably from 55° C. to 99° C., more preferably 60° C. to 98° C., upon dispensing to the precursor non-fibrous laundry detergent sheet. 
 
     
     
         14 . The method of  claim 10 , wherein the microcapsule is dispensed in a powder or dry form;
 preferably wherein the powder or dry form contains from 0% to 5%, preferably 0% to 3%, more preferably 1% to 1%, of water, by weight of the powder or dry form.   
     
     
         15 . The method according to  claim 10 , further comprising a step of stamping or embossing the precursor non-fibrous laundry detergent sheet before the step of dispensing the microcapsule to the precursor non-fibrous laundry detergent sheet.