Microwaveable packaging composition
AssigneeZeneca Limited
InventorAllan S. Wilen
Life of this patent
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Abstract
Microwaveable packing compositions exhibiting improved temperature control are provided. These compositions comprise a dielectric substrate having at least a portion of at least one of its surfaces coated with a matrix composition containing susceptor particles as well as particles of a blocking agent selected from the group consisting of calcium salts, zinc salts, zinc oxide, lithopone, silica and titanium dioxide. Also disclosed is a microwaveable ink composition useful for the preparation of such packaging compositions as well as a process for manufacturing such packaging compositions.
Claims25
A microwaveable package comprising:
- (A) a dielectric substrate substantially transparent to microwave radiation;
- and
- (B) a coating on at least a portion of at least one surface of the substrate, said coating comprising a matrix comprised of a dielectric material having dispersed therein:
- (i) a sufficient amount of particles of a microwave susceptor material whereby heat is generated when the coating is exposed to microwave radiation;
- and
- (ii) a sufficient amount of particles of a blocking agent selected from the group consisting of calcium salts, lithopone, silica and titanium dioxide whereby when said coating composition is exposed to a preselected dosage of microwave radiation, the heat generated by the susceptor material is controlled within a preselected range.
A microwaveable packaging ink composition comprising a liquid carrier having incorporated therein:
- (A) a dielectric polymeric material substantially transparent to microwave radiation;
- (B) particles of microwave susceptor material;
- and
- (C) particles of a blocking agent selected from the group consisting of calcium salts, lithopone, silica and titanium dioxide;
- the microwave susceptor material and blocking agent being present in amounts whereby when a coating formed by application of said ink composition is subjected to a preselected dosage of microwave radiation, the heat generated by the coating is controlled within a preselected range.
A process of manufacturing a microwaveable packaging composition comprising the steps of:
- (A) preparing a coating composition comprising a dielectric material having dispersed therein
- (i) particles of a microwave susceptor material;
- and
- (ii) particles of a blocking agent selected from the group consisting of calcium salts, lithopone, silica and titanium dioxide, and said microwave susceptor material and blocking agent being present in an amount whereby when a coating formed by application of said coating composition is subjected to a preselected dosage of microwave radiation, the heat generated by the susceptor material is controlled within a preselected range;
- and
- (B) coating said coating composition onto at least a portion of at least one surface of a dielectric substrate substantially transparent to microwave radiation.
A microwaveable package comprising:
- (A) a dielectric substrate substantially transparent to microwave radiation;
- and
- (B) a coating on at least a portion of at least one surface of said substrate, said coating comprising a matrix comprised of a dielectric material having dispersed therein:
- (i) particles of a microwave susceptor material;
- and
- (ii) particles of a blocking agent selected from the group consisting of calcium salts, lithopone, silica and titanium dioxide,
- wherein the microwave susceptor material comprises between about 3 to about 80 percent by weight of the total weight of the microwave susceptor material, the dielectric material and the blocking agent;
- and
- wherein the weight ratio of said blocking agent to microwave susceptor material is 1:4 or more.
A microwaveable packaging ink composition comprising a liquid carrier having incorporated therein:
- (A) a dielectric polymeric material substantially transparent to microwave radiation;
- (B) particles of microwave susceptor material;
- and
- (C) particles of a blocking agent selected from the group consisting of calcium salts, lithopone, silica and titanium dioxide;
- wherein the microwave susceptor material comprises between about 3 to about 80 percent by weight of the total weight of the dielectric polymeric material, the microwave susceptor material and the blocking agent;
- and wherein the weight ratio of said blocking agent to microwave susceptor material is 1:4 or more.
A process of manufacturing a microwaveable packaging composition comprising the steps of:
- (A) preparing a coating composition comprising a dielectric material having dispersed therein
- (i) particles of a microwave susceptor material;
- and
- (ii) particles of a blocking agent selected from the group consisting of calcium salts, lithopone, silica and titanium dioxide,
- wherein the microwave susceptor material comprises between about 3 to about 80 percent by weight of the total weight of the dielectric material, the microwave susceptor material and the blocking agent;
- and wherein the weight ratio of said blocking agent to microwave susceptor material is 1:4 or more;
- and
- (B) coating said coating composition onto at least a portion of at least one surface of a dielectric substrate substantially transparent to microwave radiation.
Dependencies are inferred from the claim text.