Scale-inhibition compositions and methods of making and using the same
View Patent ↗Provided are scale-inhibition compositions comprising (a) a first acrylic acid polymer having an average molecular weight of about 3000 to about 6000; (b) a second acrylic acid polymer having an average molecular weight of about 6000 to about 10000; (c) 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; and (d) 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. The scale-inhibition compositions may be useful in machine ware washing detergents and formulations.
1. A scale-inhibition composition comprising:
(a) a first acrylic acid polymer having an average molecular weight of about 3000 to about 6000;
(b) a second acrylic acid polymer having an average molecular weight of about 6000 to about 10000;
(c) 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; and
(d) 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.
2. The composition of claim 1 , wherein the composition has an element phosphorus content of no more than 1% by weight of the composition.
3. The composition of claim 1 , wherein the first acrylic acid polymer comprises a homopolymer of acrylic acid or salt thereof.
4. The composition of claim 3 , wherein the first acrylic acid polymer comprises an average molecular weight of about 4000.
5. The composition of claim 1 , wherein the first acrylic acid polymer is present in an amount of about 1% to about 10% by weight of the composition.
6. The composition of claim 1 , wherein the second acrylic acid polymer comprises a homopolymer of acrylic acid or salt thereof.
7. The composition of claim 6 , wherein the second acrylic acid polymer comprises an average molecular weight of about 8000.
8. The composition of claim 1 , wherein the second acrylic acid polymer is present in an amount of about 0.5% to about 7% by weight of the composition.
9. The composition of claim 1 , wherein the first acrylic acid polymer and the second acrylic acid polymer are present in a ratio of about 1.5:1 to about 3.0:1.
10. The composition of claim 1 , wherein the aminocarboxylic acid is present in an amount of about 1% to about 8% by weight of the composition.
11. The composition of claim 1 , wherein the aminocarboxylic acid comprises MGDA.
12. The composition of claim 1 , wherein the phosphonic acid is present in an amount of about 0.5% to about 4% by weight of the composition.
13. The composition of claim 1 , wherein the phosphonic acid comprises HEDP.
14. The composition of claim 1 wherein the aminocarboxylic acid is MGDA, the phosphonic acid is HEDP, and the ratio of MGDA to HEDP is about 3:1 to about 5:1.
15. The composition of claim 1 , further comprising a base selected from the group consisting of sodium hydroxide, sodium metasilicate, sodium carbonate, and combinations thereof, in an amount of about 5% to about 30% by weight of the composition.
16. The scale-inhibition composition of claim 1 , comprising:
(a) a first acrylic acid polymer having an average molecular weight of about 3000 to about 6000 in an amount of about 1% to about 10% by weight of the composition;
(b) a second acrylic acid polymer having an average molecular weight of about 6000 to about 10000 in an amount of about 0.5% to about 7% by weight of the composition;
(c) an amino carboxylic acid selected from the group consisting of 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 in an amount of about 1% to about 8% by weight of the composition; and
(d) a phosphonic acid selected from the group consisting of 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 in an amount of about 0.5% to about 4% by weight of the composition.
17. The composition of claim 16 , wherein the composition has an element phosphorus content of no more than 1% by weight of the composition.
18. The composition of claim 16 , wherein the first acrylic acid polymer is present in an amount of about 3% to about 7%, the second acrylic acid polymer is present in an amount of about 1% to about 4%, the amino carboxylic acid is present in an amount of about 3% to about 5%, and the phosphonic acid is present in an amount of from about 0.5% to about 2% by weight of the composition.
19. The composition of claim 16 , wherein the first acrylic acid polymer comprises an average molecular weight of about 4000, the second acrylic acid polymer comprises an average molecular weight of about 8000, the amino carboxylic acid comprises MGDA, and the organodiphosphonic acid comprises HEDP.
20. A detergent composition comprising the scale-inhibition composition of claim 1 .