Del. Code Ann. tit. 6, § 9-325
(a) Subordination of security interest in transferred collateral. — Except as otherwise provided in subsection (b), a security interest created by a debtor is subordinate to a security interest in the same collateral created by another person if:
(b) Limitation of subsection (a) subordination. — Subsection (a) subordinates a security interest only if the security interest: