| http://www.w3.org/ns/prov#value | - Examples of these thickening agents are neoprene rubbers, butyl rubbers, styrene-butadiene rubbers, nitrile rubbers poly(ethylene), poly(propylene), copolymers of ethylene and vinyl esters or ethers, poly(alkyl acrylates), poly(alkyl methacrylates), polyesters such as poly(ethylene maleate), poly(propylene fumarate), poly(propylene phthalate), and the like.
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