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US 12,421,402 B2Granted
Coating compositions containing low molecular weight chitosan composition
AssigneeSwimc LLC
InventorCory G. Miller
Life of this patent
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Abstract
Paint and coating compositions including a low molecular weight chitosan that may be incorporated in a coating composition at higher loading levels, which exhibits one or more of improved elongation, improved thermocycling characteristics, reduced leaching of coating components, are lesser susceptibility to fungal and mildew defacement than conventional coatings or coatings containing higher molecular weight chitosan compounds, articles coated in the same, and methods for making said coatings and coated articles.
Claims16
A method of making a coating composition comprising:
- blending a binder, a surfactant, and a first aqueous carrier to form a pre-thin:
- adding an aqueous solution of chitosan having a number average molecular weight of at most 40,000 or a weight average molecular weight of at most 75,000 or a z-average molecular weight of at most 200,000 and having a pH of less than 6.5, a pigment and a second aqueous carrier liquid, optional additives, and a base to precipitate the chitosan into precipitated chitosan;
- grinding, in grind stage, the pigment with the second aqueous carrier liquid, precipitated chitosan and optional additives, to disperse the pigment, precipitated chitosan, and optional additives into a grind paste;
- adding, in a wash stage using a wash liquid, the grind paste to the pre-thin;
- blending, in a thindown stage, the grind paste and the pre-thin to form a coating composition having a pH of about 8 to about 10.
2 more elements
Dependencies are inferred from the claim text.