My husband is a chemist. He said there are many parabens but, he is not aware of one called polyparaben. The person writing the label may have mistakenly referred to a group of parabens as a polyparaben thinking that poly means many. In this case, poly refers to polymer which is a long chain molecule such as plastic. ‘Doesn’t sound good to me. I’m glad you pointed it out.

@woogie, this is what I read on ChemicalSafetyFacts.org re Parabens:
Parabens have been safely used for almost 100 years as preservatives in the food, drug and personal care and cosmetic industries.
Parabens (including methylparaben, ethylparaben, propylparaben, butylparaben, isopropylparaben, and isobutylparaben) may be used in products such as makeup, moisturizers, and hair care and shaving products.