Back in the bad old days they used to make plastic wrap and the like by adding phthalates as a plasticizer to PVC, bad stuff, displays estrogenic activity and at least one type is a known carcinogen. Easy to detect though as phthalates give off a noticeable plastic/new car smell. They stopped using these plasticizers in food applications a long time ago, decades (in Europe they have been completely banned for all purposes, not just food, since 2005).
Most of the bags for vacuum sealing on the market aren't made this way, the Jarden FoodSaver bags are made of polyethelene with a nylon outer layer. PE is generally considered to not leach problematic chemicals into food.
The energies involved in regular (or sous vide) cooking are not high enough to break the chemical bonds that hold the polymer molecules together so they stay stable and stay put. Microwaves on the other hand...never microwave food in a plastic container.
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