Substrate coating with aqueous-based multifunctional core shell particles

摘要

The present invention relates to a method of making a coated substrate, and products therefrom, using a coating possessing a nanoparticle having a shell containing a hydrophilic nitrogen containing compound and a vinylic polymer having quaternary ammonium compounds, and a core made of at least a hydrophobic vinylic polymer, wherein such coated substrate exhibits antibacterial properties without the use of harmful organic preservatives.

主权项

1. A method of making a coated substrate having a coating comprising a nanoparticle, the method comprising the steps of:
a) dissolving a hydrophilic nitrogen containing compound in an aqueous medium to obtain a hydrophilic nitrogen containing compound solution; b) mixing the hydrophilic nitrogen containing compound solution of step a) with a hydrophilic vinylic monomer having a quaternary ammonium group; c) adding a catalyst to the mixture of step b) to initiate graft copolymerization, whereby a hydrophilic grafted copolymer is formed; d) adding a hydrophobic vinylic monomer to be polymerized with the hydrophilic grafted copolymer of step c) or with itself to obtain a mixture; e) allowing the mixture of step d) to react;
whereupon a nanoparticle is obtained and wherein the nanoparticle comprises:
(i) a shell comprising the hydrophilic grafted copolymer having a quaternary ammonium group, and(ii) a core comprising a hydrophobic vinylic polymer, f) impregnating the nanoparticle with a carrier solution to obtain an impregnated carrier solution; g) applying the impregnated carrier solution to a substrate to obtain a coated substrate; and h) drying the coated substrate,
wherein in step b) the hydrophilic vinylic monomer is added in a weight percentage of 2 to 50% of the nitrogen containing compund: wherein steps g) and h) are performed in the absence of an organic preservative; and wherein the coated substrate exhibits antibacterial properties.