Only in limited situations does the Truth in Lending Act (TILA) (and Regulation Z that implements the TILA) apply to credit cards extended for business.
Specifically, the provisions regarding the issuance of credit cards and liability for unauthorized use apply to credit cards with a business purpose. Credit cards for business purposes can't be issued on an unsolicited basis. Also, if the card is lost or stolen, the employee cardholder generally cannot be held liable for more than $50 for the unauthorized use of the card.
Refer to 12 CFR 1026 Truth in Lending (Regulation Z) for more information.