Provided are a window cover film, a method of manufacturing the same, and a flexible display panel including the same. A window cover film has an excellent interlayer binding force between each layer to have significantly improved wear resistance, scratch resistance, fingerprint wipeability, and the like, while also having excellent surface properties such as a sense of touch and slip properties, a method of manufacturing the same, and a flexible display panel including the same are provided.

A poly(amide-imide) copolymer that is a reaction product of a diamine represented by Chemical Formula 1, a tetracarboxylic acid dianhydride including a compound represented by Chemical Formula 2, and a compound represented by Chemical Formula 3: ##STR00001## wherein, in Chemical Formulae 1 to 4, R.sup.1 to R.sup.4, A, and X are the same as defined in the specification.

A poly(amide-imide) copolymer that is a reaction product of a diamine represented by Chemical Formula 1, a tetracarboxylic acid dianhydride including a compound represented by Chemical Formula 2, and a compound represented by Chemical Formula 3: ##STR00001## wherein, in Chemical Formulae 1 to 4, R.sup.1 to R.sup.4, A, and X are the same as defined in the specification.

Provided are a flexible window film and a display apparatus comprising same, the flexible window film having a substrate layer, a buffer layer and a hard coating layer that are sequentially layered, wherein the buffer layer comprises, in a thickness direction, a first area in which the amount of an amide group gradually increases from the interface between the hard coating layer and the buffer layer, and a second area in which the amount of an amide group gradually decreases from the interface between the substrate layer and the buffer layer.

Provided a diamine compound, a polyimide precursor and a polyimide film using the same, and a use thereof. The diamine compound may be very useful as a monomer for manufacturing a polyimide film having excellent transparency, high heat resistance, and low retardation.

The invention generally relates to shape memory films that are tri-functionally crosslinked and that comprise multiple, non-terminal, phenylethynyl moieties. In addition, the present invention relates methods of fabricating such films. Due to the improved properties of such SMPs, the SMP designer can program in to the SMP thermomechanical property enhancements that make the SMP suitable, among other things, for advanced sensors, high temperature actuators, responder matrix materials and heat responsive packaging.

The invention generally relates to shape memory films that are tri-functionally crosslinked and that comprise multiple, non-terminal, phenylethynyl moieties. In addition, the present invention relates methods of fabricating such films. Due to the improved properties of such SMPs, the SMP designer can program in to the SMP thermomechanical property enhancements that make the SMP suitable, among other things, for advanced sensors, high temperature actuators, responder matrix materials and heat responsive packaging.

A polyamideimide resin having an isocyanate group blocked with a compound selected from the group consisting of alcohols, oximes and lactams, and having a carboxyl group blocked with a vinyl ether group-containing compound.

A polyamideimide resin having an isocyanate group blocked with a compound selected from the group consisting of alcohols, oximes and lactams, and having a carboxyl group blocked with a vinyl ether group-containing compound.

A monomer represented by Chemical Formula 1: ##STR00001##
wherein, in Chemical Formula 1, R.sup.1, R.sup.2, A.sup.1, A.sup.2, L.sup.1, L.sup.2, o, p, q, and r are the same as defined in the detailed description.