As a new S-Corporation without an established credit history, credit card issuers will look at your personal credit to determine credit-worthiness. Many credit card issuers will also require that you be personally liable for the debts in the event the business is unable to pay back the outstanding credit. If they didn't have this in place, it would be so easy for people to form a company, apply for credit, run the bills through the roof and then just run the business into the ground. Credit card companies would have no recourse.

Until your business has an established credit history, look to be personally liable for the debts if the business fails -- regardless of whether the credit card is a personal or business card.

Also, if you use your personal credit card for business transactions -- as far as they are concerned you are PERSONALLY liable for it, not a company which you're funding that went through. They want their money back (with interest).

Another option too if you're looking to get financing [though this would affect your personal credit, not business] is to try a website such as Prosper.com. If your state allows, you can request a loan which is funded by lenders (other individuals). Sometimes loans will receive no bids (aka funding) and you get nothing, or very few bids with little money. If you think you may default on this (for some reason) -- you'd be personally liable as well.

Good luck with your business, regardless of which way you go about financing it.