Scratch resistant top coats having good adhesion
AssigneeBayer MaterialScience AG
InventorsBirgit Meyer Zu Berstenhorst, Peter Capellen
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Abstract
The present invention relates to a multilayer system comprising a base layer consisting of a thermoplastic, a primer layer, and a scratch resistant layer consisting of a scratch resistant top coat, the multilayer system being characterized in that the primer layer contains a certain UV absorber and a certain amount of acid, preferably acetic acid, is added to the scratch resistant top coat.
Claims9
A multilayer system comprising a base layer comprising a thermoplastic, a primer layer, and a scratch resistant layer comprising a scratch resistant top coat, wherein said primer layer comprises a silylated UV absorber based on triazine and said scratch resistant layer is produced from a scratch resistant top coat comprising an acid, wherein said multilayer system further comprises an interpenetration layer (IPL), wherein the base layer (B), primer layer(s) (Pr), scratch resistant layer(s) (SR), and interpenetration layers assume one of the following layer sequences:
- (B)-(Pr)-(IPL)-(SR)
- (SR)-(B)-(Pr)-(IPL)-(SR)
- (SR)-(IPL)-(Pr)-(B)-(Pr)-(IPL)-(SR),
- and wherein the film thickness ratio of said interpenetration layer to said scratch resistant layer is greater than 10%,
- wherein said silylated UV absorber based on triazine is selected from the compounds
- and said acid is acetic acid.
Dependencies are inferred from the claim text.