US 12,466,972 B2 · Coating composition free of titanium dioxide

Abstract

Disclosed is a coating composition including, in relation to 100% of the weight thereof: 10-90 wt. % of at least one film-forming polymer selected from methyl cellulose, hydroxy propyl methyl cellulose, hydroxy propyl cellulose, hydroxy ethyl cellulose, sodium carboxy methyl cellulose, ethyl cellulose, PVA (polyvinyl alcohols), PVA-PEG (polyethylene glycol) copolymers, polyvinyl acetate, polyvinyl pyrrolidones (PVP), vinylpyrrolidone-vinyl acetate copolymers, alginates, pectin, arabic gum, guar gum, carrageenans, xanthan gum, inulin, chitosan, methacrylic acid copolymer, ethyl acetate, or polyethylene glycol-polypropylene glycol (PEG-PPG) copolymer; 0-50 wt. % of at least one auxiliary coating agent selected from diluents, surfactants, plasticisers and anti-foaming agents; and 10-50 wt. % of a whitening filler free of titanium dioxide including at least one alkaline or alkaline earth salt of a fatty acid and at least one cellulose compound selected from cellulose, cellulose powder, microcrystalline cellulose, or a mixture of the components.

Claims12

Dependent claims

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.

5 more elements

Dependencies are inferred from the claim text.

Coating composition free of titanium dioxide

Life of this patent

Coating composition free of titanium dioxide

Life of this patent

Abstract

Claims12