several hundred Google hits

Maybe it's "spin-out" you need:

http://en.wikipedia.org/wiki/Spin_out

Spin out refers to a type of spin off where a company "splits off" sections of itself as a separate business.

http://www.isis-innovation.com/spinout/

http://www.drugresearcher.com/Research-management/Biofusion-...

I can't find any references to contract or agreement though.

"split-off" (Fin, US) -Ausgliederung + Aktientausch (i.e. parts of the assets of a coropration is transferred to a corporation controlled by the transferor, and the stock of the transferee corporation is distributed to the shareholders of the transferor corporation, in excahnge for part of their stock.) [Wirtschaftswörterbuch, Wilhelm Schäfer, Band I]

... separately and exempted from the restrictions pursuant to § 181 German Civil Code (BGB), to represent them in any change to the split off agreement in any regard that may be necessary or
expedient for registration of this document.
Reference is made to the annexes to the split off agreement (list of annexes, item II. above); the parties waived reading of these annexes ...
http://www.telekom.com/dtag/cms/contentblob/dt/en/141860/blo...

e.g:
Also on July 16, 2009 and immediately prior to the transactions contemplated by the Split-Off Agreement, the Company and OLI entered into an Assignment and Assumption Agreement, a copy of which is attached as Exhibit 10.2 to this Current Report on Form 8-K and is incorporated herein by reference. Pursuant to the terms of the Assignment and Assumption Agreement, OLI assumed substantially all of the assets and liabilities of the Company. Upon completion of the transactions contemplated by the Split-Off Agreement and the Assignment and Assumption Agreement, the Company had substantially no assets and no liabilities and is currently in the process of contemplating other business opportunities, including, but not limited, to a merger or business combination with one or more possible parties. The Company has not entered into any definitive agreements with any party relating to such a transaction.
http://209.85.229.132/search?q=cache:Upo7e__b5d0J:biz.yahoo....

INITIAL PUBLIC OFFERING AND SPLIT-OFF AGREEMENT

INITIAL PUBLIC OFFERING AND SPLIT-OFF AGREEMENT (this "AGREEMENT") dated as of , 1999, among Viacom Inc., a Delaware corporation ("VIACOM"), Viacom International Inc., a Delaware corporation and a wholly owned subsidiary of Viacom ("VIACOM INTERNATIONAL"), and Blockbuster Inc., a Delaware corporation and an indirect, wholly owned subsidiary of Viacom ("BLOCKBUSTER"). Certain capitalized terms used herein are defined in Article I of this Agreement.
http://www.techagreements.com/agreement-preview.aspx?num=370...