exhibit 10. 59 material noted with [ * * ] is confidential and has been deleted pursuant to a request for confidential treatment, and filed separately with the securities and exchange commission west pharmaceutical services exxonmobil chemical company 2006 - 2010 worldwide butyl polymer supply / purchase agreement exxonmobil chemical company ( “ emcc ” or “ seller ” ), a division of exxon mobil corporation, and certain of exxon mobil corporation ’ s affiliates, which affiliates emcc expects to concur in the terms of this agreement, ( collectively, “ emcc / a ” ) hereby agree to supply west pharmaceutical services ( “ wps ” or “ buyer ” ) and its affiliates ( collectively, “ wps / a ” ) with exxon® butyl, exxon chlorobutyl, exxon bromobutyl, and exxon star - branched chlorobutyl polymers ( collectively called “ products ” ) under the terms and conditions set out below. affiliates emcc / a participating in this agreement are listed in attachment a. wps / a participating in this agreement are listed in attachment b. the emcc affiliates and west affiliates covered under agreement are defined as those in which emcc and wps, respectively, own more than 50 % and has operating control. emcc / a will support new volumes of standard emcc grades required for the new china operation ( assuming majority owned and operated by wps ). [ * * ] emcc and wps each represent and warrant that each has the authority to bind its respective affiliates so listed in the terms of this agreement and will provide documentation of authority to wps and emcc, respectively, upon request. this list of participating affiliates in attachments a and b are non - exclusive to the extent that new wps locations and emcc affiliates may be added during the term of this agreement by mutual consent. term of agreement this agreement is for the period january 1, 2006 through december 31, 2010. it is the intent of both parties to [ * * ] following negotiation of the terms and conditions of this agreement unless either party [ * * ] of this agreement. negotiations between the parties to renegotiate the terms and conditions of this agreement will commence at least 6 months prior to the expiration of this agreement, december 31, 2010. location of supply north america latin america europe asia - pacific usa brazil denmark singapore mexico france china germany united kingdom serbia north america latin america europe asia