About: http://webisa.webdatacommons.org/193686597

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The addition of at least one organic acid which contains at least three carboxyl groups, such as citric acid or sodium citrate, to the carboxylated nitrile rubber is also critical.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com