	US 12,466,963 B2
	Transparent varnish composition
Jorma Viitanen, Espoo (FI); Katrine Nylund, Espoo (FI); and Sami Haakana, Espoo (FI)
Assigned to FP-Pigments Oy, Espoo (FI)
Appl. No. 17/436,686
Filed by FP-Pigments Oy, Espoo (FI)
PCT Filed Mar. 9, 2020, PCT No. PCT/FI2020/050146 § 371(c)(1), (2) Date Sep. 7, 2021, PCT Pub. No. WO2020/178487, PCT Pub. Date Sep. 10, 2020.
Claims priority of application No. 20195167 (FI), filed on Mar. 7, 2019.
Prior Publication US 2022/0169870 A1, Jun. 2, 2022
Int. Cl. C09D 7/61 (2018.01); B05D 7/26 (2006.01); C08K 3/26 (2006.01); C09D 7/40 (2018.01)

CPC C09D 7/61 (2018.01) [B05D 7/26 (2013.01); C08K 3/26 (2013.01); C09D 7/67 (2018.01); C09D 7/68 (2018.01); C08K 2003/265 (2013.01); C08K 2201/005 (2013.01); C08K 2201/011 (2013.01)]

22 Claims

1. A method of preparing a transparent varnish composition comprising the steps of:

providing a binder;

adding to the binder 1 to 40 wt % precipitated calcium carbonate particles by weight of the composition, wherein:

the precipitated calcium carbonate particles have an average D₅₀particle size of 60 to 120 nm, measured by dynamic light scattering,

fewer than 10% of the precipitated calcium carbonate particles by volume of the total precipitated calcium carbonate particles have a particle size of 75 nm or less,

fewer than 10% of the precipitated calcium carbonate particles by volume of the total precipitated calcium carbonate particles have a particle size of 110 nm or more, and

the steepness of the particle size distribution of the precipitated calcium carbonate particles is in the range of 1.3-1.55, and

dispersing the precipitated calcium carbonate in the composition.