Method of making and using heat resistant resin coated paperboard product and product thereof
AssigneeInternational Paper Company
InventorsRobert W. Self, Allan A. Whillock
Life of this patent
Estimating the term…
Abstract
A paperboard product resistant to discoloration and otherwise stable upon heating, coated on the first surface thereof with a pigmented water impermeable layer and on the second surface thereof with a pigmented water permeable layer. The paperboard product is desirably used as the material employed in containers for food that is to be cooked in conventional or microwave ovens. The container is constructed so that the food in the container is in contact with the water impermeable layer.
Claims17
A paperboard product comprising:
- (a) a paperboard substrate having affixed to its first surface a water impermeable layer, said water impermeable layer comprising a binder with opaque pigment dispersed therein;
- and
- (b) a continuous water permeable layer affixed to the second surface of said paperboard substrate, said water permeable layer comprising a binder with opaque pigment dispersed therein, said paperboard product characterized by the facts that (i) it retains a brightness of at least 70% on its permeable side and at least 50% on its impermeable side after exposure to 400.degree. F. for 30 minutes, and (ii) it will not puff or blister when placed in an oven heated to 350.degree. F. for 15 minutes.
A paperboard container for cooking food comprising a coated paperboard substrate formed into the shape of a container, said container comprising:
- (a) an inside surface comprising a water impermeable layer affixed to said paperboard substrate, said water impermeable layer comprising a binder with opaque pigment dispersed therein;
- and
- (b) an outside surface comprising a continuous water permeable layer affixed to said paperboard substrate, said water permeable layer comprising a binder with opaque pigment dispersed therein, said paperboard container being characterized by the facts that (i) it retains a brightness of at least 70% on its permeable side and at least 50% on its impermeable side after exposure to 400.degree. F. for 30 minutes;
- and (ii) it will not puff or blister when placed in an oven heated to 350.degree. F. for 15 minutes.
A paperboard container for cooking food comprising a coated paperboard substrate formed into the shape of a container, said container comprising:
- (a) an inside surface comprising a water and grease impermeable layer affixed to said paperboard substrate, said water and grease impermeable layer comprising a binder with opaque white pigment dispersed therein;
- and
- (b) an outside surface comprising a continuous water permeable layer affixed to said paperboard substrate, said water permeable layer comprising a binder with opaque white pigment dispersed therein, said paperboard container being characterized by the facts that (i) it retains a brightness of at least 70% on its permeable side and at least 50% on its impermeable side after exposure to 400.degree. F. for 30 minutes;
- and (ii) it will not puff or blister when placed in an oven heated to 350.degree. F. for 15 minutes.
A process for producing a paperboard product comprising:
- (a) affixing a continuous water permeable layer comprising a mixture of binder and opaque pigment to a first surface of a paperboard substrate;
- and
- (b) affixing a water impermeable layer comprising a binder and opaque pigment to a second surface of said paperboard substrate.
Dependencies are inferred from the claim text.