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US 9,783,931 B2Granted
Coating composition
AssigneeImerys Minerals Limited
InventorsJanet Preston, Graham O'Neill, Jonathan Phipps
Life of this patent
Estimating the term…
Abstract
A barrier coating composition may include an alcohol-based binder and an inorganic particulate. The barrier coating composition may be used in various ways, including in paper products including the barrier composition, methods of preparing the paper products, articles, particularly food grade packaging formed from the paper products, and packaged products, particularly packaged foodstuffs including the packaging.
Claims19
A paper product comprising:
- a paper substrate, and
- a barrier coating composition comprising an alcohol-based binder and an inorganic particulate,
- wherein the amount of alcohol-based binder present in the barrier coating composition is greater than 20% and less than 50% by weight based on the total weight of the barrier coating composition,
- wherein the paper substrate is a fibrous substrate comprising recycled pulp, and the recycled pulp comprises mineral oil, and
- wherein the barrier coating composition forms at least one coating layer on the paper substrate and has a total coat weight ranging from 5 g/m2 to 15 g/m2.
2 more elements
A paper product comprising:
- a paper substrate comprising mineral oil, the paper substrate having a first surface and a second surface opposite the first surface;
- and
- a barrier composition covering at least a portion of the first surface and the second surface, the barrier composition comprising, with respect to the total weight of the barrier composition:
- greater than 20% by weight of an alcohol-based binder;
- and
- greater than 50% by weight of an inorganic particulate, wherein the inorganic particulate has a d90 diameter of less than 3 μm;
- wherein the barrier composition reduces or prevents passage of the mineral oil through the barrier composition.
4 more elements
A paper product comprising:
- a paper substrate;
- and
- a barrier coating covering at least a portion of the paper substrate, the barrier coating comprising:
- a first layer comprising a polyvinyl alcohol binder obtained by partial hydrolysis of polyvinyl acetate, such that the polyvinyl alcohol binder comprises acetate functional groups and hydroxyl functional groups;
- and
- a second layer comprising a barrier composition comprising the polyvinyl alcohol binder and greater than 50% by weight, with respect to the total weight of the barrier composition, of particulate kaolin having a shape factor of at least 90.
3 more elements
Dependencies are inferred from the claim text.