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US 11,377,576 B2Granted
Structural adhesive with improved corrosion resistance
Assignee3M Innovative Properties Company
InventorsElisabeth Cura, Sohaib Elgimiabi
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Abstract
The present disclosure relates to a thermosettable structural adhesive composition comprising an epoxy compound; a thermoplastic compound; an epoxy curing agent; at least one mineral filler, wherein the at least one mineral filler is capable of absorbing water. The thermosettable structural adhesive composition can exhibit an improved corrosion resistance while also providing good adhesive properties such as good t-peel strength and overlap shear strength.
Claims17
A method for bonding parts, the method comprising:
- i. Providing a first part and a second part;
- ii. Providing a thermosettable structural adhesive composition to at least one surface of the first part and/or the second part, with the structural adhesive composition comprising:
- (a) an epoxy compound;
- (b) a thermoplastic compound;
- (c) an epoxy curing agent that does not act as a catalyst;
- (d) at least one mineral filler, wherein the at least one mineral filler is capable of absorbing water and is selected from the group consisting of metal oxides and metal hydroxides;
- and
- (e) at least one component comprising at least one epoxy moiety and at least one linear or branched alkyl group, wherein component (e) is different from (a) the epoxy compound;
- iii. Adhering together the first part and the second part using the structural adhesive composition at a temperature lower than the activation temperature of the epoxy curing agent, thereby forming a joint between the first and the second part, and
- iv. Heating the joint at a temperature higher than the activation temperature of the epoxy curing agent, so as to cause thermosetting of the thermosettable composition.
7 more elements
Dependencies are inferred from the claim text.