The present invention relates to foam-paperboard laminates
(foam-paperboard laminates) prepared using an in situ foaming process.
The foam-paperboard laminates of the present invention are formed by
extruding LDPE polymer onto a moisture containing paperboard to provide a
LDPE-coated paperboard material. Upon heating of the LDPE-coated
paperboard, the moisture in the paperboard causes steam to act as a
blowing agent for the LDPE and a LDPE foam is obtained. The foam is
adhered to the paperboard by way of physical adhesion of the polymer to
the paperboard. The foam-paperboard laminates of the present invention
exhibit insulating and cushioning properties. The foam-paperboard
laminates are suitable for use, for example, in insulating beverage cups,
food service containers, packaging material, and in other products where
laminates can be useful.