Anon Sirisaengtaksin, CEO of Thailand's largest petrochemical firm PTT Global Chemical Pcl (PTTGC), speaks during an interview with Reuters in Bangkok July 4, 2012. PTTGC plans to invest $11 billion by 2020 to expand capacity and focus on high-margin specialties and greeen products, Sirisaengtaksin said. Picture taken July 4, 2012. To match Interview THAILAND-PTTGLOBAL/ REUTERS/Chaiwat Subprasom (THAILAND - Tags: BUSINESS ENERGY ENVIRONMENT)