A fluorinated polymer suitable for deposition and capable of favorable metal patterning, is provided. A resin film containing such a fluorinated polymer as a material is provided. Further, a photoelectronic element having such a resin film in its structure is provided.

A fluorinated polymer which satisfies the following requirements (1) to (3): (1) the melting point is less than 200° C., or no melting point is observed, (2) the thermogravimetric loss rate when the temperature is increased at a temperature-increasing rate of 2° C./min under a pressure of 1×10.sup.−3 Pa, substantially reaches 100% at 400° C. or lower, (3) when the temperature is increased at a temperature-increasing rate of 2° C./min under a pressure of 1×10.sup.−3 Pa, the temperature width from a temperature at which the thermogravimetric loss rate is 10% to a temperature at which it is 90%, is within 200° C.

A resin composition contains a curable resin. A minimum value (Min) of loss tangent (tanδ = E″/E′) of a cured product of the resin composition is equal to or greater than 0.04. The loss tangent is a ratio of a loss modulus (E″) of the cured product of the resin composition to a storage modulus (E′) thereof. The loss modulus (E″), the storage modulus (E′), and the loss tangent (tanδ = E″/E′) are obtained by dynamic mechanical analysis at a temperature equal to or higher than 100° C. and equal to or lower than 200° C.

The present invention relates to compounds according to formula (I) and to heat-curable resin compositions based on polymaleimide resin systems comprising such compounds as co-monomers: wherein R.sup.1 signifies an 1-alkenyl- or 2-alkenyl group with 3 to 6 carbon atoms, wherein R.sup.2 signifies hydrogen or an alkoxy group with up to 2 carbon atoms, wherein R.sup.3 signifies hydrogen or an alkyl group with up to 4 carbon atoms, and wherein R.sup.4 signifies hydrogen or an alkyl group with up to 4 carbon atoms. The present invention also relates to crosslinked resins obtainable by curing such compositions. Compounds of the present invention can be used amongst others in fields like structural adhesives, matrix resins for fiber prepregs, moulding compounds, as well as structural and/or electrical composites. ##STR00001##

A hard coating film may include a substrate and a hard coating layer provided on at least one surface of the substrate, in which, when the hard coating film is folded and unfolded 200,000 times with a bending radius of 1 mm in the direction in which the hard coating layer is oriented inwards under 60 C. and 90% relative humidity (RH), breakage does not occur, and the amount of change in transmission b* (chromaticity) of the film after UV irradiation for 100 hr using a 15 W UV-B lamp is 1.5 or less. The hard coating film may exhibit superior anti-curling properties, superior bending resistance under high-temperature and high-humidity conditions, and high light resistance, and can thus be applied not only to an image display device but also to a window for a flexible display device.

A preparation method of a superabsorbent polymer, and a superabsorbent polymer prepared thereby are provided. The preparation method of the superabsorbent polymer according to the present disclosure prevents polymer particles from being broken or the surface thereof from being damaged during preparation and handling of the superabsorbent polymer, thereby providing a superabsorbent polymer having excellent absorption properties and permeability.

A brightness enhancement film coating material and an application thereof, where preparation raw materials for the coating material, in parts by weight, at least comprise the following components: 20-76 parts a monofunctional photocuring monomer, 20-76 parts a bifunctional photocuring monomer, 1-10 parts a photoinitiator, and 0-4 parts an auxiliary agent. No white streaks are produced after a brightness enhancement film formed by means of the present coating material undergoes a high-temperature high-humidity reliability test, and the adaptability of the brightness enhancement film and a polarizer is improved. Also, a reliability test is able to reflect, to a certain extent, a long-term use situation, and an excellent reliability test result can ensure long-term use stability of a display panel, and fragments produced during a cutting process are prevented from contaminating a film sheet and thereby affecting a use effect thereof.

The present invention relates to compounds according to formula (I) and to heat-curable resin compositions based on polymaleimide resin systems comprising such compounds as co-monomers: wherein R.sup.1 signifies an 1-alkenyl- or 2-alkenyl group with 3 to 6 carbon atoms, wherein R.sup.2 signifies hydrogen or an alkoxy group with up to 2 carbon atoms, wherein R.sup.3 signifies hydrogen or an alkyl group with up to 4 carbon atoms, and wherein R.sup.4 signifies hydrogen or an alkyl group with up to 4 carbon atoms. The present invention also relates to crosslinked resins obtainable by curing such compositions. Compounds of the present invention can be used amongst others in fields like structural adhesives, matrix resins for fiber prepregs, moulding compounds, as well as structural and/or electrical composites.

##STR00001##

A hard coating film may include a substrate and a hard coating layer provided on at least one surface of the substrate, in which, when the hard coating film is folded and unfolded 200,000 times with a bending radius of 1 mm in the direction in which the hard coating layer is oriented inwards under 60? C. and 90% relative humidity (RH), breakage does not occur, and the amount of change in transmission b* (chromaticity) of the film after UV irradiation for 100 hr using a 15 W UV-B lamp is 1.5 or less. The hard coating film may exhibit superior anti-curling properties, superior bending resistance under high-temperature and high-humidity conditions, and high light resistance, and can thus be applied not only to an image display device but also to a window for a flexible display device.

The invention relates to fine and uniform copolymer powders of partial mixed metal salts of lower alkyl vinyl ether-maleic acid copolymers having a defined particle size distribution. In particular; it relates to powders that are suitably used in the areas of oral care and pharmaceuticals and to methods for preparing the powders. Provided is a composition of powders of partial mixed metal salts of lower alkyl vinyl ether-maleic acid copolymers having: (i) a Dv50 of less than or equal to 25 microns; a Dv90 of less than or equal to 50 microns; and (ii) a particle uniformity reflected by a Dv90/Dv10 ratio of less than or equal to 10.

A preparation method of a superabsorbent polymer, and a superabsorbent polymer prepared thereby are provided. The preparation method of the superabsorbent polymer according to the present disclosure prevents polymer particles from being broken or the surface thereof from being damaged during preparation and handling of the superabsorbent polymer, thereby providing a superabsorbent polymer having excellent absorption properties and permeability.