Patent ID: 7482055

Claim:
A laminated packaging material comprising a core layer and a barrier layer formed from a liqueform composition comprising a dispersion or a solution of a polymer, starch or starch derivate, on one side of the core layer, the barrier layer also including particles of amorphous SiO 2 , wherein said particles of amorphous SiO 2 are present in colloidal particle size in said barrier layer in a content above 40 weight % but below 80 weight %, wherein said particles of amorphous, colloidal SiO 2 have a particle size of at least 3 nm and at most 150 nm, and wherein said particles of amorphous, colloidal SiO 2 have a specific area weight of 80-170 m 2 /g, wherein said dispersion or solution is formed from a polymer which comprises functional hydroxyl groups or functional carboxyl groups, wherein said core layer consists of a layer of paper or paperboard, and wherein the laminate packaging material further comprises outer, liquid-tight coatings of polymer material.