Adhesive composition
AssigneeHexcel Composites Limited
InventorMichael RHODES
Life of this patent
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Abstract
An adhesive composition comprising a silane-modified epoxy resin, a dicyclopentadiene novolac epoxy resin and a curing agent. The composition shows good oily steel bonding, even in the absence of CTBN rubber or rubber adducts as toughening agents, with good Tg values of the cured resin and good Tg retention after hot wet aging.
Claims32
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An adhesive composition which comprises, by total weight of the composition:
- (a) 1 to 15% of a silane-modified epoxy resin, comprising an alkoxy- or alkoxysilane-modified epoxy resin, having an expoxy-equivalent weight of 170 to 1,000 g/eq.;
- (b) 20 to 60% dicyclopentadiene novolac epoxy resin, having an expoxy equivalent weight of approximately 200 to 300 g/eq. and a softening point of 60 to 90° C.;
- (c) 1 to 10% curing agent comprising dicyandiamide.
- (d) 5 to 30% core shell rubber;
- (e) 1 to 10% nitrile rubber-modified epoxy resin;
- and
- (f) 5 to 10% inorganic filler which is an oil absorbent.
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Dependencies are inferred from the claim text.