▎ 摘　　要

NOVELTY - Coated paper product (1) comprises paper or paperboard substrate (101), and barrier coating (103) comprising graphene and polyolefin copolymer bearing carboxylic acid moieties, where the polyolefin copolymer bearing carboxylic acid moieties is ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic-acid-copolymer (EMAA) or maleic acid ethylene copolymer (MAE). USE - The product is useful for packaging (claimed), which is used to sensitive products, e.g. food, and beverages. ADVANTAGE - The product: has water vapor transmission rate of below 65 g/(m2day) measured according to at 38° C and 90% relative humidity; and allows formation of packages by sealing the paper to itself. DETAILED DESCRIPTION - INDEPENDNET CLAIMS are also included for: packaging comprising the coated paper product; producing coated paper product comprising providing paper or paperboard substrate, and coating the substrate with barrier coating having graphene and polyolefin copolymer bearing carboxylic acid moieties, where the polyolefin copolymer bearing carboxylic acid moieties is EAA, EMAA, or MAE; and use of coating comprising graphene and polyolefin copolymer bearing carboxylic acid moieties as water vapor barrier on paper or paperboard substrate, where the polyolefin copolymer bearing carboxylic acid moieties is EAA, EMAA, or MAE. DESCRIPTION OF DRAWING(S) - The figure illustrates coated paper product. 1Coated paper product 101Paper substrate 102Pre-coating layer 103Barrier coating layer