Granted Patent B2

US 9,920,288 · App. 14/669,604 · Granted Mar 20, 2018

Abstract

Claims (26)

1. A tablet comprising

i) a dishwashing detergent composition;

ii) a sequestering agent comprising

(a) an aminocarboxylic acid selected from methylglycine diacetic acid (MGDA), glutamic acid diacetic acid (GLDA), diethylene triamine pentaacetic acid (DTPA), hydroxyethyl ethylene diamine triacetic acid (HEDTA), ethylenediaminetetraacetic acid (EDTA), and a combination thereof;

(b) a phosphonic acid selected from 1-hydroxyethane 1,1-diphosphonic acid (HEDP), amino tris(methylenephosphonic acid) (ATMP), ethylenediamine tetra(methylene phosphonic acid) (EDTMP), tetramethylenediamine tetra(methylene phosphonic acid) (TDTMP), hexamethylenediamine tetra(methylene phosphonic acid) (HDTMP), diethylenetriamine penta(methylene phosphonic acid) (DTPMP), and a combination thereof; and

(c) at least one acrylic acid polymer having average molecular weight of less than 12,000; and

iii) a crosslinked acrylic acid polymer having a weight average molecular weight (Mw) of at least 500,000,

wherein the tablet dissolves at a maintained rate of less than 2 grams per liter in an automatic dishwashing machine.

2. The tablet of claim 1 , wherein the crosslinked acrylic acid polymer of iii) is in powder form and has a glass transition temperature of 105° C.

3. The tablet of claim 1 , wherein the crosslinked acrylic acid polymer of iii) has a viscosity of at least 3000 mPa·S when dispersed in water at a concentration of 1%, pH 7.5, and a temperature of 25° C.

4. The tablet of claim 1 , wherein the crosslinked acrylic acid polymer of iii) comprises a monomer, wherein the monomer comprises unsubstituted acrylic acid or acrylic acid substituted with alkyl.

5. The tablet of claim 1 , wherein the crosslinked acrylic acid polymer of iii) comprises a homopolymer.

6. The tablet of claim 1 , wherein the crosslinked acrylic acid polymer of iii) comprises a copolymer.

7. The tablet of claim 6 , wherein the copolymer comprises a copolymer of acrylate and C10-30 alkyl acrylate.

8. The tablet of claim 1 , wherein the crosslinked acrylic acid polymer of iii) is crosslinked by a crosslinker selected from the group consisting of polyalkenyl ethers, divinyl glycol, and combinations thereof.

9. The tablet of claim 1 , wherein the crosslinked acrylic acid polymer of iii) is present at an amount of from 0.1% to 10% by weight of the tablet.

10. The tablet of claim 1 , wherein the crosslinked acrylic acid polymer of iii) is present at an amount of from 1% to 5% by weight of the tablet.

11. The tablet of claim 1 , wherein the tablet loses less than 2% of mass in a friability test using a plastic chamber with a dropping height of 15 cm and operating at 25 rpm for 4 minutes.

12. The tablet of claim 1 , wherein the tablet dissolves at a rate of less than 1 gram per liter in an automatic dishwashing machine.

13. The tablet of claim 1 , wherein the dissolution rate of the tablet in an automatic dishwashing machine remains at less than 2 grams per liter regardless of the position of tablet in the automatic dishwashing machine.

14. The tablet of claim 1 , wherein the dishwashing detergent composition comprises at least one ingredient selected from the group consisting of alkalinity source, surfactant, sequestrating agent, defoamer, and rinse aid.

15. The tablet of claim 14 , wherein the dishwashing detergent composition comprises an alkalinity source selected from the group consisting of sodium carbonate, sodium hydroxide, potassium hydroxide, and sodium metasilicate.

16. The tablet of claim 14 , wherein the dishwashing detergent composition comprises a rinse aid selected from the group consisting of cationic starch, cationic esterquat, and combinations thereof.

17. The tablet of claim 1 , wherein the tablet has a diameter of from about 50 mm to about 70 mm; a thickness of from about 10 mm to about 20 mm; and a weight from about 40 grams to about 80 grams.

18. The tablet of claim 1 , wherein the aminocarboxylic acid is MGDA and the phosphonic acid is HEDP.

19. The tablet of claim 18 , wherein the weight ratio of MGDA to HEDP is about 3:1 to about 5:1.

Assignments (13)