To lz,
I am a technical support engineer before MBA. Although, I don't know any R&D engineer who applies to MBA(my R&D engieer friends usually enjoy what they are doing), I believe you still have chances. That's depends on how you show your interest in business, and how you demonstrate your communication skills. Generally speaking, technical support or sales engineers can easily demonstrate their communication skills which are very important in the business world; while for R&D engineers, it is a little difficult to show good soft skills. that is what you need to pay attention to and work on. Basically, we all belong to the pool of engineer, no matter R&D, application, software engineers or product engineer; no matter which industry we are from; we are all engineers.
Good luck! Think about it seriously, by yourself, if you don't like the profession as an engineer, what else do you like? does it have to be business or you are only attracted by the so-called big money? (MBA does not mean good pay.) if you truly want to do something in business, no matter what you did before, present it well and the experience only adds your diversity to the school. | 
