Enzymatic preservation of water based paints
View Patent ↗A preserved and/or conserved water based paint composition comprising an oxidoreductase, an oxidizing agent, a binder and at least 10% w/w water.
1. A paint composition comprising
(a) a peroxidase or laccase;
(b) an enhancer (i) of the following formula:
wherein A is —D, —CH═CH—D, —CH═CH—CH═CH—D, —CH═N—D, —N═N—D, or —N═CH—D, in which D is selected from the group consisting of —CO—E, —SO 2 —E, —N—XY, and N + —XYZ, in which E is —H, —OH, —R, or —OR, and X, Y and Z are identical or different and are —H or —R; wherein R is a C1–C16-alkyl group, which is saturated or unsaturated, branched or unbranched, and unsubstituted or substituted with a carboxy, sulpho or amino group; and B and C are identical or different and are C m H 2m+1 , wherein m is 1, 2, 3, 4 or 5; or (ii) is an inorganice halide ion;
(c) an oxidizing agnet;
(d) a viscosifier selected from the group consisting of polyarcylates, polyurethane and cellulose derivatives;
(e) an acrylic compound;
(f) at least 10% w/w water;
(g) a pigment; and
(h) a solvent.
2. The composition of claim 1 , wherein the composition comprises a laccase.
3. The composition of claim 2 , wherein the laccase is obtained from a strain selected from the group consisting of Coprinus, Myceliophthora, Polyprous, Rhizoctonia , and Schytalidium.
4. The composition of claim 1 , wherein the composition comprises a peroxidase.
5. The composition of claim 4 , wherein the peroxidase is obtained from a strain of Coprinus.
6. The composition of claim 4 , wherein the peroxidase is a haloperoxidase.
7. The composition of claim 6 , wherein the haloperoxidase is obtained from a strain selected from the group consisting of Altemaria, Curvuaira, Dendryphiella, Drechsiera, Geniculosporium , and Phaeotrichoconis.
8. The composition of claim 7 , wherein the haloperoxidase is obtained from Curvularia inaequalis CBS, Curvularia verruculosa Curvulaeria verruculosa, Dendryphiella saline, Drechsiera hartlebii, Geniculosporium sp. or Phaeotrichonconis crotalarie.
9. The composition of claim 1 , comprising two or more enhancers.
10. The composition of claim 1 , wherein the enhancer is an enhancer of the following formula:
wherein A is —D, —CH═CH—D, —CH═CH—CH═CH—D, —CH═N—D, —N═N—D, or —N═CH—D, in which D is selected from the group consisting of —CO—E, —SO 2 —E, —N—XY, and N + —XYZ, in which E is —H, —OH, —R, or —OR, and X, Y and Z are identical or different and are —H or —R; wherein R is a C 1 –C 16 -alkyl group, which is saturated or unsaturated, branched or unbranched, and unsubstituted or substituted with a carboxy, sulpho or amino group; and B and C are identical or different and are C m H 2m+1 , wherein m is 1, 2, 3, 4 or 5.
11. The composition of claim 10 , wherein the enhancer is methyl syringate.
12. The composition of claim 1 , wherein the oxidoreductase is a haloperoxidase and the enhancer is an inorganic halide ion.
13. The composition of claim 12 , wherein the inorganic halide ion is 0.05–500 mM chloride ions and 0.01–100 mM bromide or iodide ions.
14. The composition of claim 1 , comprising between about 0.01 to about 1000 mg enzyme protein per liter composition.
15. The composition of claim 1 , comprising 10–90% w/w water.
16. The composition of claim 1 , comprising 5–50% w/w of a binder.
17. The composition of claim 1 , comprising 0.001–500 mM of the oxidizing agent.
18. The composition of claim 1 , further comprising one or more of filters, dispersants, foam suppressors and siccatives.