Silly Putty ingredient found in McNuggets

A recent CNN investigation found that the same chemicals found in Silly Putty can be found in McNuggets:

American McNuggets (190 calories, 12 grams of fat, 2 grams of saturated fat for 4 pieces) contain the chemical preservative tBHQ, tertiary butylhydroquinone, a petroleum-based product. They also contain dimethylpolysiloxane, "an anti-foaming agent" also used in Silly Putty.

Yummy. All McNuggets not created equal

 Funny thing is that you won't find the chemical in McNuggets sold in England - Why is that?