Verb (used without object) : The old book is gradually disintegrating with age.    From Dictionary.com. 

Verb (used with object) : Rocks are disintegrated by frost and rain.    From Dictionary.com. 

The formations being disintegrable in different degrees, there follows an increased irregularity of surface.    From Wordnik.com.  [Essays on Education and Kindred Subjects Everyman's Library] Reference