US 11,926,967 B2
Water-based coatings for cellulosic substrates
Yongping Zha, Berkeley Heights, NJ (US); Vanessa Gordon, Montvale, NJ (US); and Philippe Schottland, Sparta, NJ (US)
Assigned to SUN CHEMICAL CORPORATION, Parsippany, NJ (US)
Filed by SUN CHEMICAL CORPORATION, Parsippany, NJ (US)
Filed on May 7, 2020, as Appl. No. 16/868,856.
Application 16/868,856 is a continuation in part of application No. PCT/US2019/014261, filed on Jan. 18, 2019.
Application PCT/US2019/014261 is a continuation in part of application No. PCT/US2018/060142, filed on Nov. 9, 2018.
Application PCT/US2019/014261 is a continuation in part of application No. PCT/US2018/060142, filed on Nov. 9, 2018.
Claims priority of provisional application 62/585,034, filed on Nov. 13, 2017.
Prior Publication US 2020/0263359 A1, Aug. 20, 2020
Int. Cl. D21H 19/58 (2006.01); C09D 7/20 (2018.01); C09D 7/40 (2018.01); C09D 7/61 (2018.01); C09D 7/65 (2018.01); C09D 133/12 (2006.01); D21H 19/40 (2006.01)
CPC D21H 19/58 (2013.01) [C09D 7/20 (2018.01); C09D 7/61 (2018.01); C09D 7/65 (2018.01); C09D 7/68 (2018.01); C09D 7/69 (2018.01); C09D 133/12 (2013.01); D21H 19/40 (2013.01)] 18 Claims
 
1. A water-based coating composition, comprising:
a) one or more polymer binders, in an amount of 35 wt % to 95 wt %, on a solids weight basis; and
b) one or more particles, in an amount of 0.1 wt % to 50 wt %, on a solids weight basis;
wherein at least one of the one or more polymer binders has a glass transition temperature (Tg) of less than 10° C.;
wherein at least one of the one or more polymer binders has a heat seal onset temperature of less than 200° C.;
wherein at least one of the one or more particles comprise one or more talc particles having a mean particle size of 10 to 100 μm;
wherein the water-based coating composition, when dried on a substrate, forms a 1 inch wide, coating-to-coating heat seal with a sealing strength above 400 gf/in; and
wherein the coating-to-coating heat seal with a sealing strength above 400 gf/in. is formed by heating the coating, when dried on a substrate, at 160° C. (320° F.) and 40 psi for 1 sec, or 121° C. and 50 psi for 3 sec;
wherein the water-based coating composition comprises a solids content of 30 wt % to 70 wt %.