US 12,466,972 B2
Coating composition free of titanium dioxide
Stéphanie Despax, Paris (FR); and Sophie Faget, Paris (FR)
Assigned to SOCIETE D'EXPLOITATION DE PRODUITS POUR LES INDUSTRIES CHIMIQUES SEPPIC, Paris (FR)
Appl. No. 16/626,764
Filed by SOCIETE D'EXPLOITATION DE PRODUITS POUR LES INDUSTRIES CHIMIQUES SEPPIC, Paris (FR)
PCT Filed Jul. 12, 2018, PCT No. PCT/FR2018/051756
§ 371(c)(1), (2) Date Dec. 26, 2019,
PCT Pub. No. WO2019/020892, PCT Pub. Date Jan. 31, 2019.
Claims priority of application No. 1757164 (FR), filed on Jul. 27, 2017.
Prior Publication US 2020/0140714 A1, May 7, 2020
Int. Cl. C09D 101/02 (2006.01); C09D 5/02 (2006.01); C09D 5/03 (2006.01); C09D 101/08 (2006.01); C08K 3/08 (2006.01); C08K 5/00 (2006.01); C08K 5/053 (2006.01); C08K 5/098 (2006.01); C08K 5/10 (2006.01)
CPC C09D 101/02 (2013.01) [C09D 5/024 (2013.01); C09D 5/033 (2013.01); C09D 101/08 (2013.01); C08K 3/08 (2013.01); C08K 2003/0818 (2013.01); C08K 5/0016 (2013.01); C08K 5/053 (2013.01); C08K 5/098 (2013.01); C08K 5/10 (2013.01); C08K 2201/003 (2013.01); C08K 2201/019 (2013.01)] 12 Claims
 
1. A coating composition comprising, per 100% of its weight:
from 40% to 60% by weight of a film-forming polymer, said film-forming polymer being hydroxypropyl methylcellulose (HPMC),
from 0% to 20% by weight of at least one auxiliary coating agent chosen from diluents, surfactants, plasticizers or antifoaming agents, and
from 20% to 40% by weight of a whitening filler devoid of titanium dioxide comprising at least one alkali metal or alkaline earth metal fatty acid salt chosen from the magnesium salt of stearic acid and the calcium salt of stearic acid and at least one cellulose compound chosen from cellulose, cellulose powder, microcrystalline cellulose or a mixture of these components;
wherein at least 90% by volume of the particles of said at least one cellulose compound have a diameter of 40 to 60 micrometers;
wherein said HPMC is present in a greater amount by weight than said whitening filler devoid of titanium dioxide;
wherein the whitening filler is composed, per 100% of weight, of 25% to 75% by weight of said alkali metal or alkaline earth metal fatty acid salt and of 25% to 75% by weight of said cellulose compound; and
wherein said coating composition is in the form of mixtures of powders or of granules.