Water- and heat-resistant scratch-and-sniff coating
View Patent ↗A scratch-and-sniff coating is provided comprised of a first coating on a substrate having a water- and heat-resistant second coating thereon, the first coating being comprised of a non-encapsulated flavor/fragrance component and a polysaccharide component, and the second coating comprised of a shellac component. The scratch-and-sniff coating is made by forming a first coating comprised of a non-encapsulated flavor/fragrance component and a polysaccharide component and drying the first coating, and forming a water- and heat-resistant shellac-containing second coating on the first coating, and drying the second coating. An encapsulated flavor/fragrance component may optionally be present in the first coating. The scratch-and-sniff coating can be applied to a package for a consumer article.
1. A method of making a scratch-and-sniff coating, comprising the steps of:
(a) forming a first coating of the scratch-and-sniff coating by applying on an exterior surface of a container for a consumer article a coating comprised of a non-encapsulated flavor/fragrance component and a polysaccharide component;
(b) drying said coating of step (a);
(c) forming a second coating of the scratch-and-sniff coating by applying a protective water- and heat-resistant second coating on said dried coating of step (b), said second coating comprised of a shellac component; and
(d) drying said second coating.
2. The method of claim 1 , wherein said flavor/fragrance is selected from the group consisting of spearmint oil, cinnamon oil, oil of wintergreen, peppermint oil, clove oil, bay oil, anise oil, eucalyptus oil, thyme oil, cedar leaf oil, oil of nutmeg, allspice, oil of sage, mace, oil of bitter almonds, cassia oil, vanilla, citrus oils and fruit essences.
3. The method of claim 1 , wherein said polysaccharide is selected from the group consisting of alginic acid, alginic acid salts and derivatives thereof, pectin, locust bean gum, guar gum, pectinic acid, a pectinate, a pectate, polygalacturonic acid, carrageenan, cross-linkable cellulose or a derivative thereof, xanthan gum, agar, cross-linkable starch or a cross-linkable guar gum.
4. The method of claim 1 , wherein said first coating is dried at a temperature in the range of about 30 to about 90 ° C.
5. The method of claim 1 , wherein said second coating includes a solvent and is dried at a temperature in the range of about 25 to about 90 ° C.
6. The method of claim 1 , wherein said second coating is applied in the form of a mixture of said shellac and a solvent for said shellac.
7. The method of claim 1 , wherein said shellac coating is applied in the form of an aqueous dispersion of said shellac.
8. The method of claim 1 , wherein the consumer article is a package.
9. The method of claim 1 , wherein the consumer article is a bottle or a jug.
10. The method of claim 8 , wherein the package is an overwrapped package with a tear strip.
11. The method of claim 1 , further comprising the step of:
(e) scratching the second coating in order to release the flavor/fragrance component and the polysaccharide component.
12. The method of claim 1 , wherein the substrate in the step of forming a first coating of a scratch-and-sniff coating is a planar surface.