I am looking to buy defaulting insurance for a business loan?
Answers: If you're the lender, and you lend for a living, what you're looking for is called credit insurance. The agent that does the rest of your bank insurance can explain what it does and how it works, and get you a quote.
If you're the borrower, you can't borrow money, and buy a policy to settle up it off when you opt to default. That product does not exist, because, logically, with the sole purpose people who plan on defaulting would buy it, and a company that sold it would walk out of business paying claims.