PITTSBURGH--(BUSINESS WIRE)--PPG Industries (NYSE:PPG) announces the following details for its first quarter 2015 earnings release and teleconference call.       Earnings release: Thursday, April 16, 2015, before U.S. stock markets open   Teleconference: Thursday, April 16, 2015, 2 p.m. ET   PPG participants: Charles E. Bunch, Chairman and Chief Executive Officer Michael H. McGarry, President and Chief Operating Officer Frank S. Sklarsky, Executive Vice President and Chief Financial Officer Vin