Typically, bankers require a personal guarantee when a business is obtaining a commercial loan, especially if the business cannot offer collateral. The personal guarantee provides that if your business defaults on the note signed by the business, you are personally responsible for the debt.
Lenders are reluctant and take great caution when lending money.
They typically require both a primary and a secondary source of repayment to ensure that they can collect on a loan. The primary source could be the firm's revenue flow and the secondary source the sale of collateral. However, banks do not lend money in the hopes of collecting on the collateral if the business defaults. Lenders want their money back with interest, not your property or business. Lenders may also insist on your signing a personal guarantee to make certain that you and your management team have maximum motivation to pay off the loan.