Photodegradation-resistant electrodepositable primer...

Details Photodegradation-resistant electrodepositable primer... Photodegradation-resistant electrodepositable primer...

C - Chemistry, Metallurgy

09

D

C09D 5/44 (2006.01) B05D 1/36 (2006.01) B05D 7/00 (2006.01) B05D 7/16 (2006.01) C09D 7/12 (2006.01) C09D 163/00 (2006.01) C25D 13/06 (2006.01) C25D 13/10 (2006.01)

Patent

CA 2163862

Electrodepositable primer compositions comprising an aqueous dispersion of an ionic epoxy-based resin, a hindered amine light stabilizer and an antioxidant mixture which comprises a phenolic antioxidant and a sulfur-containing antioxidant. The primer compositions find particular use under topcoats which are permeable to UV radiation which, in the absence of the hindered amine and antioxidant mixture, causes delamination of the topcoat from the primer coat.

L'invention concerne des compositions pour apprêt électrodéposable comprenant une dispersion aqueuse d'une résine ionique à base d'époxy, d'un photostabilisant contenant une amine entravée et d'un mélange d'antioxydants comprenant un antioxydant phénolique et un antioxydant contenant du soufre. On utilise tout particulièrement ces compositions pour apprêt sous les couches de finition qui sont perméables aux rayons UV, lesquels, en l'absence de l'amine entravée et du mélange d'antioxydants, provoquent la délamination de la couche de finition.

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