Cleaning method, apparatus and use

Patent metadata

Field	Value
Publication number	US-11414633-B2
Application number	US-201615748234-A
Country	US
Kind code	B2
Filing date	Jul 28, 2016
Priority date	Jul 29, 2015
Publication date	Aug 16, 2022
Grant date	Aug 16, 2022

Abstract

A method for cleaning a substrate which is or comprises a textile, the method comprising agitating the substrate and a cleaning composition comprising: i. cleaning particles comprising a thermoplastic polyamide and a hydrophilic material at least part of which is located inside the cleaning particle, said cleaning particles having an average particle size of from 1 to 100 mm; and ii. a liquid medium. An apparatus suitable for performing said method comprising a rotatable cleaning chamber and a particle storage tank containing the cleaning particles. Use of the cleaning particles for cleaning a substrate which is or comprises a textile.

First claim

The invention claimed is:

1. A method for cleaning a substrate which consists of or comprises a textile, the method comprising agitating the substrate and a cleaning composition comprising:
i. cleaning particles comprising a thermoplastic polyamide and a hydrophilic material dissolved or dispersed within the thermoplastic polyamide throughout the volume of the particles, said cleaning particles having an average particle size of from 1 to 20 mm; and
ii. an aqueous liquid medium,
wherein the cleaning particles are not degradable and are insoluble in water;
wherein the cleaning particles retain the hydrophilic material after the agitating;
wherein the hydrophilic material consists of or comprises a surfactant, a dye transfer inhibitor (DTI) or a builder, or wherein the hydrophilic material consists of or comprises a polyether;
wherein the hydrophilic material is present in an amount of from 0.1 to 15 wt % based on a total weight of the cleaning particle; and
wherein the thermoplastic polyamide consists of or comprises nylon 6, nylon 6,6, nylon 6,10 or a copolymer or blend thereof.

2. A method according to claim 1 wherein the hydrophilic material consists of or comprises a surfactant.

3. A method according to claim 2 wherein the surfactant is an anionic surfactant.

4. A method according to claim 3 wherein the anionic surfactant comprises one or more groups selected from the group consisting of sulfonate, sulfate and a combination thereof.

5. A method according to claim 4 wherein the anionic surfactant is dodecyl benzene sulfonate.

6. A method according to claim 1 wherein the hydrophilic material consists of or comprises a dye transfer inhibitor (DTI).

7. A method according to claim 6 wherein the DTI consists of or comprises a polymer.

8. A method according to claim 7 wherein the polymer comprises one or more repeat units obtained by polymerizing vinyl pyrrolidone.

9. A method according to claim 8 wherein the polymer comprises repeat units obtained by copolymerizing vinyl pyrrolidone and vinyl imidazole.

10. A method according to claim 1 wherein the hydrophilic material consists of or comprises a builder.

11. A method according to claim 10 wherein the builder consists of or comprises a polymer having carboxylic acid groups or salts thereof.

12. A method according to claim 11 wherein the builder consists of or comprises a polymer comprising repeat units obtained from polymerizing one or more of the monomers selected from the group consisting of maleic acid, acrylic acid, methacrylic acid, ethacrylic acid, vinylacetic acid, allylacetic acid, itaconic acid, 2-carboxy ethyl acrylate and crotonic acid which may be in the form of the free acid or salt thereof.

13. A method according to claim 12 wherein the builder consists of or comprises a polymer comprising the repeat units obtained by polymerizing one or more of the monomers selected from the group consisting of acrylic acid, methacrylic acid, and maleic acid which may be in the form of the free acid or salt thereof.

14. A method according to claim 13 wherein the builder consists of or comprises a copolymer of maleic acid-co-acrylic acid which may be in the form of the free acid or salt thereof.

15. A method according to claim 1 wherein the hydrophilic material consists of or comprises a polyether.

16. A method according to claim 15 wherein the polyether consists of or comprises polyether block polyamide.

17. A method according to claim 1 wherein the cleaning particles comprise a filler.

18. A method according to claim 1 wherein the cleaning particles have an average density of at least 1.3 g/cm 3 .

19. A method according to claim 1 wherein the substrate is a soiled substrate.

20. A method according to claim 1 wherein the cleaning particles have an average particle size of from 1 to 10 mm.

21. A method according to claim 20 wherein the cleaning particles have an average particle size of from 5 to 10 mm.

22. A method according to claim 1 wherein the cleaning particles have a shape selected from the group consisting of ellipsoidal, spherical, cylindrical and cuboid.

23. A method according to claim 1 wherein the cleaning particles are re-used in further procedures according to the method.

24. A method according to claim 23 wherein the cleaning particles are re-used for at least 10 cleaning procedures according to the method.

25. A method according to claim 1 wherein the cleaning particles are prepared by a process which comprises extrusion using an extruder with a barrel length to diameter ratio of at least 5:1.

26. A method according to claim 1 wherein the cleaning particles comprise substantially no phase-separated domains of the hydrophilic material having any linear dimension which is larger than 1 mm.

27. A method according to claim 1 ,
wherein said method further comprises the steps of (a) recovering said cleaning particles; (b) agitating a second washload comprising at least one substrate and a cleaning composition comprising the cleaning particles recovered from step (a), wherein said substrate consists of or comprises a textile; and (c) optionally repeating steps (a) and (b) for subsequent washload(s) comprising at least one substrate which consists of or comprises a textile.

28. A method according to claim 1 which is performed at a temperature of from 15 to 50° C.

Assignees

• Xeros Ltd

Inventors

• Bird Robert Andrew
• Jenkins Stephen Derek
• Kloke Philipp
• Kniesel Simon
• Sathyanarayana Shyam
• Schoemer Martina

Classifications

• D06B3/30

  of articles, e.g. stockings · CPC title

• C11D3/3719 Primary

  Polyamides or polyimides · CPC title

• C11D3/0021

  Dye-stain or dye-transfer inhibiting compositions · CPC title

• C11D1/22

  derived from aromatic compounds · CPC title

• C11D3/43

  Solvents · CPC title