| 摘要 |
According to the invention there is provided a structural element for a wall or roof of a roofed construction including: a base structural element formed from a rigid polymeric material; a polymeric coating on the base structural element; a covering formed from a polymeric material and overlaying at least a portion of the base structural element; and optionally, an adhesive layer which adheres the covering to the base structural element; in which the polymeric coating, either directly or indirectly, acts to promote adhesion of the covering to the base structural element, and is formed by polymerising a polymeric precursor which includes a group of sub-formula (I) where R1 is i) CRa, where Ra is hydrogen or alkyl, ii) a group S(O)pR13, or SiR14 where R13 and R14 are independently selected from hydrogen or hydrocarbyl, p is 0, 1 or 2 and q is 1 or 2, iii) C(O)N, S(O)2N, C(O)ON, CH2ON, or CH=CHRCN where Rc is an electron withdrawing group, or iv) OC(O)CH, C(O)OCH or S(O)2CH; in which R12 is selected from hydrogen, halo, nitro, hydrocarbyl, optionally substituted or interposed with functional groups, or - R3- R5 -Y1; R2 and R3 are independently selected from (CR7R8)n, or a group CR9R10, CR7R8CR9R10 or CR9R10CR7R8 where n is 0, 1 or 2, R7 and R8 are independently selected from hydrogen, halo or hydrocarbyl, and either one of R9 or R10 is hydrogen and the other is an electron withdrawing group, or R9 and R10 together form an electron withdrawing group; R4 and R5 are independently selected from CH or CR11 where CR11 is an electron withdrawing group, the dotted lines indicate the presence or absence of a bond, X1 is a group CX2X3 where the dotted line bond to which it is attached is absent and a group CX2 where the dotted line to which it is attached is present, Y1 is a group CY2Y3 where the dotted line to which it is attached is absent and a group CY2 where the dotted line to which it is attached is present, and X2,X3,Y2 and Y3 are independently selected from hydrogen, fluorine or other substituents. |
