Patent ID: 6066375
Filing Date: 2000-05-23
Classification: B65D,Y10T

Abstract:
A microwaveable, food contact compatible, disposable, rigid and strong paperboard useful as a base stock for forming substantially high microwaveable food containers comprising:(a) a sized paperboard blank having a basis weight suitable for a food container;(b) a base coat coating applied to one or both surfaces of the paperboard blank, the base coat coating comprising a mixture of an inorganic pigment and an acrylic latex comprising aliphatic copolymers having the following monomers: ##STR12## wherein R and R.sup.1 may be the same or different aliphatic hydrocarbons having one to six carbon atoms and the ratio of (i) to (ii) is in the range of 1:100 to 100:1;(c) a top coat coating layer applied to the base coat coating layer, the top coat coating layer comprising an inorganic pigment and an aliphatic polymer latex comprising aliphatic copolymers having the following monomers: ##STR13## wherein R and R.sup.1 may be the same or different aliphatic hydrocarbons having one to six carbon atoms and the ratio of (i) to (ii) is in the range of 1:100 to 100:1; and wherein said coated microwaveable paper board evolves less than 0.1 milligrams of benzene per square inch of the paperboard surface at temperatures in excess of 430.degree. F. while exposed to microwave.