| 摘要 |
<p>A composition comprises a polyurethane and a mould-release compound of one of the formulae [A-(NR-CX-O)a-]m-Y'-[-(O-CX-NR)b-B]n A-(O-CX-NR)a-Y-(NR-CX-O)B-B A-(NR-CX-NR)a-Y-(NR-CX-NR)B-B wherein A, B and each R are independently selected from hydrogen, C1-35 alkyl, C6-14 aryl and substituted aryl, the substituents being halogen, C1-35 alkyl, C6-14 aryl, C1-35 alkylthio, C6-14 arylthio or C7-15 aralkyl, provided that at least one of A, B and R is not hydrogen; X is oxygen or sulphur; Y is C1-35 alkylene, C6-14 arylene, C7-30 aralkylene, -(CH2)1-4-O-(CH2)1-4-, -(CH2)1-4-S-(CH2)1-4-, or a polyester, polyether, polycarbonate or polybutadiene having a molecular weight of 400 to 4000; Y' is Y or a valence bond; m and n are independently selected from 1, 2 and 3; and one of a and b is an integer and the other is zero or the same or a different integer.</p> |
