Laminate flooring is not recommended for any use other than flooring. While it could possibly be used for other things, certain properties of the material make it a bad choice for high-impact areas of the house, such as a kitchen countertop.
The North American Laminate Flooring Association specifically states on its website that laminate flooring should only be used on floors. If you want to use it for another purpose, it is recommended that you check the building codes in your area and communicate with the manufacturer of the laminate flooring you plan to use.
Problems with laminate flooring
There are some problems with laminate flooring that make it less than ideal for countertops. Laminate flooring is easily torn and scratched, so would not hold up well under an onslaught of heavy pans and sharp-edged objects.
Laminate flooring is also not recommended for surfaces that get wet frequently, as prolonged moisture can cause the core of the material to warp or swell, and countertops almost always see a lot of water.
A better choice for a countertop is plastic laminate, which is not so sensitive to moisture.