Water-based inks with high renewable content
The present invention provides water-based ink and coating compositions having a high renewable resin content. The ink and coating compositions of the invention comprise equal to or greater than 65% (w/w) renewable resins, based on the total combined weight of the resins. Renewable resins derived from gum rosins are preferred. The ink and coating compositions of the present invention exhibit physical properties (e.g. adhesion and resistance) that are as good as, or better than, current commercially available inks (e.g. acrylic based inks not containing renewable material).
1. A water based ink or coating composition comprising:
a) one or more renewable resins;
b) one or more self-crosslinking acrylic resins;
c) one or more crosslinking agents;
d) silicone; and
e) 0% (w/w) to 15% (w/w) one or more colorants, based on the total weight of the ink or coating composition;
wherein the content of the one or more renewable resins is equal to or greater than 65% (w/w), based on the total weight of the resin content in the ink or coating composition;
wherein the total resin content is 5% (w/w) to 50% (w/w), based on the total weight of the ink or coating composition; and
wherein the crosslinking agents are selected from the group consisting of zinc oxide, carbodiimide, cupric oxide, magnesium oxide, calcium oxide, glutaraldehyde, glyoxal, potassium persulfate, aluminum chloride, titanium tetrahydrochloride, zinc chloride, and combinations.
2. The ink or coating composition of claim 1 , wherein at least one renewable resin is a renewable gum rosin.
3. The ink or coating composition of claim 2 , wherein the renewable gum rosin resin comprises one or more maleic resins, or one or more fumaric resins, or one or more polyester resins, or combinations thereof.
4. The ink or coating composition of claim 1 , wherein the self-crosslinking acrylics are present in an amount of 0.05% (w/w) to 20% (w/w), based on the total weight of the ink or coating composition.
5. The ink or coating composition of claim 1 , wherein the crosslinking agent is selected from the group consisting of zinc oxide, carbodiimide, and combinations thereof.
6. The ink or coating composition of claim 1 , wherein at least one crosslinking agent is zinc oxide.
7. The ink or coating composition of claim 1 , wherein the crosslinking agents are present in an amount of 0.5% (w/w) to 6% (w/w), based on the total weight of the ink or coating composition.
8. The ink or coating composition of claim 1 , wherein the silicone is in the form of a silicone emulsion.
9. The ink or coating composition of claim 1 , wherein the silicone is present in an amount of 0.5% (w/w) to 2% (w/w), based on the total weight of the ink or coating composition.
10. The ink or coating composition of claim 1 , comprising 6% (w/w) to 15% (w/w) one or more colorants, based on the total weight of the composition.
11. The ink or coating composition of claim 1 further comprising one or more additives selected from the group consisting of adhesion promoters, light stabilizers, de-gassing additives, waxes, ammonia, flow promoters, defoamers, antioxidants, stabilizers, surfactants, dispersants, plasticizers, rheological additives, and combinations thereof.
12. The ink or coating composition of claim 1 , further comprising one or more coalescents.
13. The ink or coating composition of claim 12 , wherein the coalescents comprise an acrylic with a glass transition temperature (Tg) less than 20° C.
14. A substrate comprising the ink or coating composition of claim 1 .
15. An article comprising the substrate of claim 14 .
16. The article of claim 15 , wherein the article is a packaging article.
17. The article of claim 16 , wherein the packaging article is suitable for food packaging applications.
18. The article of claim 15 , wherein the article is suitable for beverage cups.
19. The ink or coating composition of claim 1 , wherein the crosslinking agents are selected from the group consisting of zinc oxide, carbodiimide, cupric oxide, magnesium oxide, calcium oxide, potassium persulfate, aluminum chloride, titanium tetrahydrochloride, zinc chloride, and combinations thereof.
20. The ink or coating composition of claim 1 , wherein the silicone is present in an amount of 0.5% (w/w) to 1% (w/w), based on the total weight of the ink or coating composition.
21. The ink or coating composition of claim 1 , wherein the total resin content is 15% (w/w) to 20% (w/w), based on the total weight of the ink or coating composition.
22. The ink or coating composition of claim 1 , wherein the content of the one or more renewable resins is 65% (w/w) to 70% (w/w), based on the total weight of the resin content in the ink or coating composition.