Multilayered article and a process for its preparation

Details Multilayered article and a process for its preparation Multilayered article and a process for its preparation

2007-07-31

2007-07-31

Feely, Michael J. (Department: 1712)

Stock material or miscellaneous articles

Composite

Of silicon containing

C428S448000, C427S377000, C427S379000, C427S387000, C427S402000, C427S419200

Reexamination Certificate

active

10673906

ABSTRACT:
A multilayered article is disclosed, which includes, in sequence: (1) a substrate (S), e.g., of thermoplastic polycarbonate; (2) a scratch-resistant layer (SR); and (3) a top layer (T). The scratch-resistant layer is prepared by curing a scratch-resistant coating composition comprising a polycondensate prepared from at least one silane, said polycondensate being prepared by a sol-gel process. The top layer is prepared by curing a top layer coating composition prepared by hydrolyzing a composition which includes:at lest one compound represented by general formula I,in-line-formulae description="In-line Formulae" end="lead"?M(R′)m  (I)in-line-formulae description="In-line Formulae" end="tail"?wherein M is an element selected from the group consisting of Si, Ti, Zr, Sn, Ce, Al, B, VO, In and Zn, R′ represents a hydrolysable radical, and m is an integer from 2 to 4; and optionally at least one compound represented by general formula II,in-line-formulae description="In-line Formulae" end="lead"?RbSiR′a,   (II)in-line-formulae description="In-line Formulae" end="tail"?wherein the radicals R′ and R are the same or different, R′ is as defined for general formula (I), R represents a group selected from an alkyl group, an alkenyl group, an aryl group, a hydrocarbon group with at least one halogen group, an epoxide group, a glycidyloxy group, an amino group, a mercapto group, a methacryloxy group and a cyano group, and a and b independently of one another have a value from 1 to 3, provided that the sum of a and b is four.The multilayered articles are distinguished by possessing outstanding scratch and abrasion resistance.

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