Momentive Performance Materials Inc., a maker of silicone and quartz products owned by Leon Black’s Apollo Global Management LLC, is girding for a dispute over the bankruptcy exit plan it wants a judge to confirm in August, Bloomberg News reported on Friday. Momentive may face opposition to the plan’s approval at a five-day trial starting Aug. 14, given that litigation with creditors may require a “substantial” investigation, according to court papers filed yesterday. Momentive asked Bankruptcy Judge Robert Drain to approve a schedule that would wrap up discovery in the cases by July 25. Discovery should “take place on an expedited timetable,” Momentive said in the filing. The company said that it began talks with its creditors’ committee to try and speed up document production, deposition of witnesses and other matters.