Adhesiveless susceptor films and packaging structures

A composite for use in a microwave oven formed into a shape sufficient to enclose a food product to be cooked, the composite comprising:

• a flexible first substrate, the first substrate comprising a heat-sealable polymeric material having opposed first and second surfaces, the material transparent to microwaves;
• and
• a microwave absorptive layer deposited on the first surface of the first substrate, the microwave absorptive layer covering a sufficient area of the first surface so that the composite will heat when microwaves contact the absorptive layer;
• a dimensionally stable second substrate comprising a heat-sealable material that is heat-sealed to the microwave absorptive layer.

A package for cooking a food product in a microwave oven, comprising:

• a first substrate having opposed first and second surfaces, the first substrate comprising a heat-sealable amorphous polyester having the characteristics of Table I;
• a microwave absorptive layer affixed to a first surface of the first substrate, the microwave absorptive layer comprising a material that increases in temperature when exposed to microwave energy;
• and
• a dimensionally stable second substrate comprising a material that includes a heat-sealable amorphous polyester having the characteristics of a density of 1.26 (g/cc), a melt point of 265.degree. C., elongation of 300-500% and secant modulus of 1430 Mpa, the dimensionally stable second substrate heat-sealed to at least the microwave absorptive layer.