| 摘要 |
<p>It concerns a crosslinkable and foaming polyester-polyurethane resin moulding composition, comprising :
- an A component, comprising :
A1) at least one poly-functional isocyanate compound, and
A2) at least one free radical polymerisation initiator
- a B component, comprising by weight :
B1) 100 parts of at least one polyol resin comprising :
- B11) 50 to 80 parts of at least one ethylenically unsaturated polyester polyol
- B12) 20 to 50 parts of at least one ethylenically unsaturated monomer,
with,
B11), being the reaction product of :
a) an acid component comprising :
a1) at least one ethylenically unsaturated diacid, and
a2) at least one saturated diacid
with a1/a2 molar ratio so varying to have an unsaturation content in B11) from 0.25 to 5,
and,
b) a diol component in excess with respect to component a)
B2) from 0.01 to 1.1 parts of water,
B3) optionally, up to 35% of at least one hydroxy alkyl (meth)acrylate,
B4) at least one catalyst of the isocyanate / hydroxyl reaction,
B5) at least one accelerator for the free radical initiator decomposition,
B6) at least one foam stabiliser,
B7) optionally, fillers and/or other additives
the said composition being free of any primary or of secondary amine and of any polyol of low Mw chain extender. The invention further relates to a process of preparation and specific uses in light weight articles in sanitary, building or automotive uses.</p> |
