Abstract: A liquid discharge head includes a piezoelectric element configured to vibrate; a damper configured to reduce vibration energy generated by the piezoelectric element; a first substrate joined to the damper, the first substrate having a first space facing one surface of the damper vibrates; a second substrate opposite to the first substrate via the damper, the second substrate having: a recess accommodating the piezoelectric element, and a second space facing another surface of the damper, the second space disposed opposite to the first space via the damper and a leg between the damper and the second substrate the leg joined to the second substrate with an adhesive including a filler.

Abstract: A liquid discharge head includes: multiple pressure chambers respectively communicating with multiple nozzles from each of which a liquid is discharged; a diaphragm defining a part of a wall of the multiple pressure chambers; an electromechanical conversion element attached to the diaphragm, the electromechanical conversion element configured to deform the diaphragm to discharge the liquid in the multiple pressure chambers through the multiple nozzles in a discharge direction; a damper film having a first surface and a second surface opposite to the first surface; a channel substrate including: a common chamber communicating with each of the multiple pressure chambers; and a first bonding portion bonded to the first surface of the damper film; and a damper substrate including a second bonding portion bonded to the second surface of the damper film.

Abstract: A method for producing a propylene-.alpha.-olefin block copolymer, which comprises polymerizing propylene in the presence of a catalyst and then polymerizing in a gas phase an .alpha.-olefin other than propylene, or propylene and other .alpha.-olefin without deactivating the catalyst, wherein at least one compound selected from the group consisting of an aromatic carboxylic acid ester, a phosphorous ester, an unsaturated dicarboxylic acid diester, an amine compound and an amide compound, is supplied to the latter gas phase polymerization system.