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US 6,218,442 B1Granted
Corrosion resistant structural foam
AssigneeHenkel Corporation
InventorsBradley L. Hilborn, Bruce Lee Harrison
Life of this patent
Estimating the term…
Abstract
Titanates and zirconates bearing organic substituents can act as corrosion inhibitors when added to foamable compositions based on thermosettable synthetic resins such as epoxy resins. Combinations of organometallates containing certain specific types of substituents provide synergistic improvements in the properties of structural reinforcement foams obtained by heating and curing the foamable compositions.
Claims27
A foamable composition comprising
- a) one or more thermosettable synthetic resins;
- b) one or more curatives;
- c) one or more blowing agents;
- and
- d) one or more organometallate compounds selected from the group consisting of organic titanates and organic zirconates in an amount effective to reduce corrosion of a metal surface in contact with a foam produced from said foamable composition as compared to a foam produced from an analogous foamable composition not containing any of said organometallate compounds.
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A foamable dough useful for producing a structural reinforcement foam, said foamable dough comprising
- a) from about 35 weight % to about 85 weight % of one or more epoxy resins, wherein at least one of said epoxy resins is a glycidyl ether of a polyhydric phenol;
- b) from about 0.5 weight % to about 10 weight % of one or more chemical blowing agents;
- c) from about 0.1 weight % to about 15 weight % of one or more curatives, wherein at least one of said curatives is a nitrogen-containing compound;
- d) one or more fillers, wherein from about 5 weight % to about 50 weight % of the foamable dough is comprised of hollow glass microspheres;
- and
- e) from about 0.1 weight % to about 2 weight % total of at least two different organometallate compounds selected from the group consisting of:
- (i) amine adducts of tetrasubstituted titanates;
- (ii) organic titanates containing at least one phosphato or pyrophosphato substituent bonded to titanium;
- (iii) organic titanates containing at least one neoalkoxy substituent bonded to titanium;
- (iv) phosphite adducts of tetrasubstituted titanates;
- (v) organic zirconates containing at least one neoalkoxy substituent bonded to zirconium;
- and
- (vi) organic zirconates containing at least one benzoate substituent or derivative thereof bonded to zirconium, wherein said organometallate compounds are present in an amount effective to reduce corrosion of a metal surface in contact with the structural reinforcement foam produced from said foamable dough as compared to a foam produced from an analogous foamable dough not containing any of said organometallate compounds.
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Dependencies are inferred from the claim text.