| 摘要 |
Powder coating compositions comprising a binder selected from carboxyl-group - containing polyesters, carboxyl-group-containing poly(meth)acrylates and mixtures of th e said substances, and one or more epoxy compounds, wherein the epoxy compounds comprise at least one compound of formula (I) that is solid at 25.degree.C: (see formula I) wherein A corresponds to a group of formula (II), (III), (IV) or (VI): (see formula II);~(see formula III); (see formula IV) or (see formula VI); in which B is an x-valent organic radical that is derived from a polyol having x or more hydroxyl groups by the removal of x hydroxyl groups; E is a (2x)-valent organic radical that is derived from a polyol having (2x) or more hydroxyl groups by the removal of (2x) hydroxyl groups; and D is a (y + 2z)-valent radical that is derived from a polyol having (y + 2z) or more hydroxyl groups by the removal of (y + 2z) hydroxyl groups; R1 and R5 are each independently of the other hydrogen, halogen, C1-C4alkyl or C1-C4alkoxy or are together a methylene group; and R2, R3, R4, R6, R7, R8 and R9 are each independently of the others hydrogen, halogen, C1-C4alkyl or C1-C4alkoxy; and x is an integer of at least 3; y is an integer from 1 to (x - 1) and z is (x - y), are distinguished by very good flowbehaviour and yield a cured material that has a high crosslinking density and good weather resistance.
|
