US 12,403,442 B2
Amine modified polysaccharide urethane/urea microcapsules
Stephen Baumler, Appleton, WI (US)
Assigned to ENCAPSYS, LLC, Appleton, WI (US)
Filed by ENCAPSYS, LLC, Appleton, WI (US)
Filed on Sep. 17, 2021, as Appl. No. 17/477,890.
Claims priority of provisional application 63/217,931, filed on Jul. 2, 2021.
Claims priority of provisional application 63/080,062, filed on Sep. 18, 2020.
Prior Publication US 2022/0088558 A1, Mar. 24, 2022
Int. Cl. B01J 13/16 (2006.01)
CPC B01J 13/16 (2013.01) 36 Claims
 
1. A microcapsule comprising a core material and a shell encapsulating the core material wherein the shell comprises the reaction product of a) an amine modified polysaccharide and b) an isocyanate component comprising one or more di- and/or poly-isocyanates wherein i) the amine modified polysaccharide is characterized as having from 0.005 up to 8 mole percent of the hydroxy groups substituted with a moiety having a free or reactive amino group, and either A) the amine modified polysaccharide is the reaction product of a polysaccharide and one or more di- or poly-functional amines and/or aminating agents selected from one or more amino-silanes, one or more amino-(meth)acrylates, one or more amine free radical initiators or a combination of any two or more of the foregoing, wherein when the amine modified polysaccharide is a maltodextrin, the amine modified polysaccharide has at least 1 amino functional group per molecule, or B) the amine modified polysaccharide is or includes a maltodextrin having at least 4 amino functional groups per molecule, and ii) the weight ratio of the polysaccharide to isocyanate is from 40:60 to 99:1.