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are there any rules for using imperial guard in a chaos army

Please use proper grammar and punctuation. You're asking a question here.

The Siege of Vraks books from Forgeworld's Imperial Armour series have a list for traitor guard with some Marine support. Here's one of said books:
http://www.forgeworld.co.uk/Warhammer-40000/Imperial_Armour_Books/IMPERIAL-ARMOUR-VOLUME-SIX-THE-SIEGE-OF-VRAKS-PART-TWO.html

Forgeworld also released an update, which can be used as an army list: http://www.forgeworld.co.uk/Downloads/Product/PDF/i/IA5_RH.pdf

cheers for that

Aside from the excelt books listed above, you also have the option for the Blood Pact. Or any other form of renegade/ traitor PDF/IG forces

Trondheim wrote:Aside from the excelt books listed above, you also have the option for the Blood Pact. Or any other form of renegade/ traitor PDF/IG forces

Well, how you paint or model them is up to you. I don't think Blood Pact have ever had official rules.