Adhesive compositions, micro-fluid ejection devices and methods for attaching micro-fluid ejection heads
View Patent ↗Adhesive compositions, micro-fluid ejection devices, and methods for attaching micro-fluid ejection heads to devices. One such adhesive composition is provided for use in attaching a micro-fluid ejection head to a device, such as to reduce chip bowing and/or to decrease chip fragility upon curing of the adhesive. Such an exemplary composition may include one having from about 50.0 to about 95.0 percent by weight of at least one cross-linkable resin selected from the group consisting of epoxy resins, siloxane resins, urethane resins, and functionalized olefin resins; from about 0.1 to about 25.0 percent by weight of at least one thermal curative agent; and from about 0.0 to about 30.0 percent by weight filler, and exhibit a relatively low shear modulus upon curing (e.g., less than about 10.0 MPa at 25° C.).
1. A thermally curable adhesive composition for attaching a micro-fluid ejection head to a device, the adhesive composition comprising:
from 55.0 to 88.0 percent by weight, based on the overall adhesive composition, of a flexible epoxy resin;
from greater than 0 to 3.5 percent by weight, based on the overall adhesive composition, of an amine adduct;
from 7.4 to 11.0 percent by weight, based on the overall adhesive composition, of an imidazole catalyst thermal curative agent; and
from 0.6 to 1.0 percent by weight, based on the overall adhesive composition, of an epoxy silane coupling agent,
wherein the adhesive composition has shear modulus of less than about 10 MPa at 25° C. and glass transition temperature of less than about 65° C.
2. The adhesive composition of claim 1 , further comprising from greater than 0 to 3.5 percent by weight, based on the overall adhesive composition, of a fumed silica.