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US 8,025,973 B2Granted
Paper substrate containing a fluorine containing compound and having enhanced grease-resistance and glueability
AssigneeInternatonal Paper Company
InventorsRichard F Rudolph, Timothy J Bradford, Barry Chapman, Pat Morabito
Life of this patent
Estimating the term…
Abstract
The invention relates to the papermaking art and, in particular, to the manufacture of paper substrates, paper-containing articles such as multilayered paper or paperboard packaging, containing a fluorine-containing compound and having enhanced glueability and/or grease resistance.
Claims46
A paper substrate, comprising:
- a web of cellulose fibers;
- a size-press applied layer in contact with at least a portion of said web of cellulose fibers, said size-press layer comprising a fluorocarbon-containing compound;
- at least one coating layer in contact with one or both of said web of cellulose fibers and said size-press applied layer, and
- a wash coat layer,
- wherein said at least one coating layer comprises from 0.5 to 50 parts starch and greater than 40 parts clay,
- wherein said fluorocarbon-containing compound interpenetrates said web of cellulose fibers in an amount from 0.5 to 100% based upon the thickness of said size-press layer, and
- wherein said fluorocarbon-containing compound is not present in said at least one coating layer.
4 more elements
A multi-layered paper substrate, comprising:
- a plurality of layers, each layer having a web of cellulose fibers;
- wherein at least one of said plurality of layers further comprises
- a size-press applied layer in contact with at least a portion of said web of cellulose fibers, said size-press layer comprising a fluorocarbon-containing compound;
- and
- at least one coating layer in contact with one or both of said web of cellulose fibers and said size-press applied layer,
- wherein said at least one coating layer comprises from 0.5 to 50 parts starch and greater than 40 parts clay,
- wherein said fluorocarbon-containing compound interpenetrates said web of cellulose fibers in an amount from 0.5 to 100% based upon the thickness of said size-press layer, and
- wherein said fluorocarbon-containing compound is not present in said at least one coating layer.
5 more elements
A paper substrate, comprising:
- a web of cellulose fibers;
- a size-press applied layer in contact with at least a portion of said web of cellulose fibers, said size-press layer comprising a fluorocarbon-containing compound;
- and
- at least one coating layer in contact with one or both of said web of cellulose fibers and said size-press applied layer,
- wherein said at least one coating layer comprises from 0.5 to 50 parts starch and greater than 40 parts clay,
- wherein said fluorocarbon-containing compound interpenetrates said web of cellulose fibers in an amount from 0.5 to 100% based upon the thickness of said size-press layer,
- wherein said fluorocarbon-containing compound is not present in said at least one coating layer, and
- wherein the fluorocarbon-containing compound is a perfluoropolyether or salt thereof.
5 more elements
Dependencies are inferred from the claim text.