Search

EP-4577627-B1 - A DETERGENT SHEET

EP4577627B1EP 4577627 B1EP4577627 B1EP 4577627B1EP-4577627-B1

Inventors

  • MURALIDHARAN, GIRISH
  • UDMALE, Vishal Mohan

Dates

Publication Date
20260513
Application Date
20230824

Claims (14)

  1. A detergent sheet for providing a cleaning composition on dissolution in water comprising: a) 15 to 80 % by weight of a surfactant; b) a water-soluble polymer comprising a cellulose containing compound having a solubility at least 0.5% by weight in distilled water at 25°C; c) a swellable disintegrant having a water absorption ratio greater than 1 measured according to the method ASTM D570 and wherein the swellable disintegrant is selected from the group consisting of microcrystalline cellulose, sodium starch glycolate and mixtures thereof; and d) 0.001 to 1.0 % by weight of a graphene or its derivative selected from graphene oxide, reduced graphene oxide or mixtures thereof; wherein the cellulose containing compound is selected from the group consisting of methyl cellulose, ethyl cellulose, ethyl methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxy ethyl methyl cellulose, hydroxypropyl methyl cellulose, ethyl hydroxy ethyl cellulose, carboxymethyl cellulose and sodium carboxymethyl cellulose and combinations thereof.
  2. A detergent sheet as claimed in claim 1 wherein the detergent sheet is free of polyvinyl alcohol.
  3. A detergent sheet as claimed in claims 1 or 2 wherein the surfactant is selected from anionic surfactant, non-ionic surfactant, amphoteric surfactant and combinations thereof.
  4. A detergent sheet as claimed in claim 3 wherein the anionic surfactant is in the range 50 to 100% by weight of total amount of the surfactant.
  5. A detergent sheet as claimed in any one of claims 1 to 4 wherein the amount of the water-soluble polymer is in the range from 5 to 50% by weight of the detergent sheet.
  6. A detergent sheet as claimed in any one of the preceding claims wherein the swellable disintegrant has a water absorption ratio greater than 5.
  7. A detergent sheet as claimed in any one of the preceding claims wherein the cellulose containing compound is selected form the group consisting of hydroxypropyl methyl cellulose, methyl cellulose, hydroxypropyl cellulose, and combinations thereof.
  8. A detergent sheet as claimed in claim 7 wherein the cellulose containing compound is hydroxypropyl methyl cellulose.
  9. A detergent sheet as claimed in any one of claims 1 to 8 wherein the amount of the swellable disintegrant is in the range from 1 to 30 % by weight of the detergent sheet.
  10. A detergent sheet as claimed in any one of claims 1 to 9 wherein the amount of the graphene or its derivative is in the range from 0.01% to 0.8 % by weight of the detergent sheet.
  11. A detergent sheet as claimed in any one of claims 1 to 10 wherein the graphene is graphene oxide.
  12. A detergent sheet as claimed in any one of claims 1 to 11 is in a unit dose format.
  13. A process for making a detergent sheet as claimed in any one of claims 1 to 12 comprising steps of: a) providing water in a container; b) adding a water-soluble polymer comprising a cellulose containing compound having a solubility at least 0.5% by weight in distilled water at 25 °C, to the water and mixing it, thereby providing a liquid premix; c) adding and mixing a swellable disintegrant having a water absorption ratio greater than 1 measured according to the method ASTM D570 wherein the swellable disintegrant is selected from the group consisting of microcrystalline cellulose, sodium starch glycolate and mixtures thereof, a graphene or its derivative selected from graphene oxide, reduced graphene oxide or mixtures thereof; and a surfactant to the premix; d) subsequently casting the premix on a surface and allowing the water to evaporate thereby forming the detergent sheet. wherein the cellulose containing compound is selected from the group consisting of methyl cellulose, ethyl cellulose, ethyl methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxy ethyl methyl cellulose, hydroxypropyl methyl cellulose, ethyl hydroxy ethyl cellulose, carboxymethyl cellulose and sodium carboxymethyl cellulose and combinations thereof.
  14. A process for providing a cleaning composition comprising steps of: a) providing water in a container; and b) dissolving a detergent sheet as claimed in any one of claims 1 to 12 or detergent sheet obtainable by process of claim 13, wherein the ratio of the detergent sheet to water is in the range from 1: 5 to 1: 6000 by weight.

Description

Field of the Invention The present invention is in the field of cleaning compositions. More particularly, the present invention relates to a detergent sheet providing a cleaning composition on dissolution in water. Background of the Invention Consumers prefer to use various cleaning products for their house-hold chores. Laundry detergent, dishwashing detergent, hard surface cleaners are few examples of such cleaning products. Often these products are available in various formats, such as, powder, bar, liquid, pods, sheet etc. Detergent products often contain detersive active for cleaning and certain additional ingredients for enhancing the cleaning efficacy and sensory. Such ingredients include sequestrant, soil release polymer, anti-redeposition polymer, anti-foaming agent, and perfume. Conventional detergent products further contain substantial amount of a carrier material, mostly, it is water in liquid format and inert fillers in solid format. This often makes the product bulky, thereby the product consumes significant amount of packaging materials, like, polyethylene, polyethylene terephthalate, polystyrene, which are predominantly sourced from non-renewable sources. It is observed that consumers are now-a-days concerned about the environment. They prefer 'eco-friendly' or 'environmental-friendly' products, i.e., the products, which contain natural or biodegradable ingredients or ingredients are sourced through renewable routes or have less or no impact on the environment when the product is made or used. Product in concentrated format is one of the steps in this direction. Consumer procures a concentrated product, doses it in washing vessels providing a washing solution. Alternatively, he/she may make a detergent by diluting/dissolving it in water and use it later. Such products are compact in size, consume lesser packaging substrate, thus reduce the consumption of packaging material. Further, processing and handling of such products, particularly transportation, has lesser impact on environment, since it is possible to carry/handle a large number of such products in single instant compared to conventional products. In this regards, detergent sheet is one of the emerging product formats. Typically, detergent sheets contain detersive actives in a water-soluble polymer matrix. Consumers are supposed to dissolve one or more of such sheets in water to generate a wash liquor or a liquid detergent and use it. It is desired that a product in sheet format should have detersive active and other ingredients in sufficient quantity to provide a cleaning efficacy at par with the conventional detergent products. It is further desired that the sheet dissolves quickly in water and should be easy to use. In this regards, CN 107 201 279 A (Kesh Chemical Ind Shenzhen Co. Ltd., 2017) discloses cloth washing sheets and preparation methods thereof. The sheets are prepared from a film forming agent, a no-ionic surfactant, an anionic surfactant, a zwitterionic surfactant, a moisturizer, a chelating agent, a preservative, edible pigment, natural essence. CN 105 886 145 A (Mingyan Biological Tech Co Ltd., 2016) discloses super-concentrated washing sheets and manufacturing methods thereof. The sheets were prepared from 15 to 60% of anion active agent, 15 to 45% of non-ionic surfactant, 1 to 20% of ampholytic surfactant, 2 to 6% of small molecule peptide compound enzyme, 1 to 3% of thickening agent, 0.1 to 0.5% of antibacterial agent, 0.1 to 0.3% of preservative, 0.1 to 1% of aromatic, 1 to 3% of filler and an appropriate amount of deionized water. WO 2017/164569 A2 (Yoo Shi Chang, 2017) discloses a paper-type detergent having excellent detergency and having convenient storage and use and a preparation method therefor. The paper-type detergent comprises 10 to 20 parts by weight of starch, 25 to 35 parts by weight of a non-ionic surfactant, 8 to 12 parts by weight of an anionic surfactant, 10 to 20 parts by weight of an emulsifier, 6 to 10 parts by weight of a dispersant, 10 to 15 parts by weight of a film forming agent, 2 to 5 parts by weight of a composite enzyme, 2 to 4 parts by weight of a nano-silver antibacterial agent and 3 to 5 parts by weight of deionized water. CN 107 714 493 A (Bai Dongchen, 2018) discloses an application of an anti-microbial and anti-ultraviolet anti-corrosive material in cosmetics of daily use. The anti-microbial and anti-ultraviolet anti-corrosive material is any one or any combinations of graphene oxide, electrochemically stripped graphene, mechanically stripped graphene and functional graphene, and the anti-microbial and anti-ultraviolet anti-corrosive material is at least contained in formulas of the cosmetics of daily use. EP 1 163 895 A1 (Kao Corp., 2001) discloses detergent compositions comprising components (A) and (B): (A) 3 to 60% by weight of at least one surfactant selected from anionic surfactants, amphoteric surfactants and hydrophilic non-ionic surfactants; and (B) 0.1 to 50% by weight