Patent ID: 7056563

Claim:
A container made from an insulating paperboard comprising: a sidewall and a bottom wall, said sidewall comprising an insulating paperboard having at least one layer of cellulose fibers, at least some of the cellulose fibers in said at least one layer being crosslinked cellulosic fibers present in an amount from 25% to 100% of said at least one layer, said paperboard being sufficiently insulating to provide a hot water ΔT across said paperboard of at least 0.7° C.±2.3° C. per 0.1 mm of caliper, said paperboard having a density of less than 0.5 g/cc, said paperboard having a basis weight of from 200 gsm to 500 gsm, the caliper of said paperboard being greater than or equal to 0.5 mm.