I think this is merely referring to a jurat certificate in a loose leaf format, meaning the blank form which you can keep in a loose leaf binder.

I am not a legal expert, but here's one defintion that seems to match much of what I saw in a Google search, all of which pointed to a certificate signed by a notary.

A jurat is a certification on a legal document which provides information about when and where the document was signed, and who witnessed the signing. Lawyers and notaries can both generate jurats which can be used to validate legal documents. A jurat is usually necessary before a document can be legally recognized.

http://www.wisegeek.com/what-is-a-jurat.htm



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Note added at 27 mins (2010-07-08 22:50:30 GMT)
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HERE IS AN EXAMPLE FROM THE STATE OF COLORAO on Jurat Statement.

1. No Notarial Certificate (Jurat)

Remember: Colorado Notary Law requires that a jurat statement appear on the document whenever a notarization is performed. When a person goes before a notary public to sign a document, the notary must perform one of two notarial acts:

Administer an oath or affirmation to the person signing the document


Take an acknowledgement from that person regarding the execution of the document in the notary’s presence.
The jurat statement regarding the notarial act he/she performed during that notarization must include:

The type of notarial act performed by the notary


The county and state in which this notarization took place


The date of the notarization


The notary must also include his/her official notary signature, seal, and commission expiration date.

http://www.sos.state.co.us/pubs/notary/common_mistakes.htm

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Note added at 31 mins (2010-07-08 22:54:16 GMT)
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THIS MAY HELP YOU ON THE QUESTION OF LOOSE:


JTCA
JTCA
Notary Jurat Stamp (Self-Inking)
Save time in writing out the Jurat statement or use when loose certificates are unavailable.
Comes in Black ink.
$18.00

http://www.corpconnect.com/category.aspx?categoryID=47

I think that loose in this case refers to a blank certificate, or a blank standard form of a certificate.