The present invention relates to novel polyimide polymers containing certain fluorinated diamine moieties, said polyimide polymers being characterized by excellent dielectric performances. The present invention also relates to the use of said polyimide-based polymers in polymer compositions in microelectronics applications.

The present invention relates to novel polyimide polymers containing certain fluorinated diamine moieties, said polyimide polymers being characterized by excellent dielectric performances. The present invention also relates to the use of said polyimide-based polymers in polymer compositions in microelectronics applications.

A curable silicone composition is provided. The composition comprises: (A) an epoxy-functional organopolysiloxane resin having monovalent aromatic hydrocarbon groups; (B) an epoxy-functional organosiloxane oligomer; (C) a photoacid generator and/or a thermal acid generator; and (D) a black azo dye. The composition exhibits good to excellent storage stability, and cures to form a cured product exhibiting good to excellent shading property without causing shrinkage and MURA defects.

A curable silicone composition is provided. The composition comprises: (A) an epoxy-functional organopolysiloxane resin having monovalent aromatic hydrocarbon groups; (B) an epoxy-functional organosiloxane oligomer; (C) a photoacid generator and/or a thermal acid generator; and (D) a black azo dye. The composition exhibits good to excellent storage stability, and cures to form a cured product exhibiting good to excellent shading property without causing shrinkage and MURA defects.

The present invention relates to new aqueous curable binder compositions comprising a carbohydrate compound, a first cross linker and a second cross linker different from the first capable of undergoing radical polymerization and possibly a free radical initiator.

Provided is a UV-curable silicone composition containing: (A) an organopolysiloxane having, in one molecule, two groups represented by formula (1)

##STR00001##

(R.sup.1 is a monovalent hydrocarbon group, R.sup.2 is an oxygen atom or an alkylene group, R.sup.3 is an acryloyloxyalkyl group, etc., p represents a number satisfying 0?p?10, and a represents a number satisfying 1?a?3.); (B) an organopolysiloxane resin which comprises (a) a unit represented by formula (2)

##STR00002##

(R.sup.1 to R.sup.3, a and p are the same as above),
(b) a R.sup.4.sub.3SiO.sub.1/2 unit (R.sup.4 represents a monovalent hydrocarbon group), and (c) a SiO.sub.4/2 unit, and in which a molar ratio of the sum of the unit (a) and the unit (b) and the unit (c) is 0.6 to 1.2:1; (C) a photopolymerization initiator; and (D) an organic peroxide,
wherein the UV-curable silicone composition has a viscosity applicable to a stereolithography such as a laser process, can be shaped even with a small amount of UV irradiation, and forms a cured product exhibiting excellent rubber physical properties.

Provided is a UV-curable silicone composition containing: (A) an organopolysiloxane having, in one molecule, two groups represented by formula (1)

##STR00001##

(R.sup.1 is a monovalent hydrocarbon group, R.sup.2 is an oxygen atom or an alkylene group, R.sup.3 is an acryloyloxyalkyl group, etc., p represents a number satisfying 0?p?10, and a represents a number satisfying 1?a?3.); (B) an organopolysiloxane resin which comprises (a) a unit represented by formula (2)

##STR00002##

(R.sup.1 to R.sup.3, a and p are the same as above),
(b) a R.sup.4.sub.3SiO.sub.1/2 unit (R.sup.4 represents a monovalent hydrocarbon group), and (c) a SiO.sub.4/2 unit, and in which a molar ratio of the sum of the unit (a) and the unit (b) and the unit (c) is 0.6 to 1.2:1; (C) a photopolymerization initiator; and (D) an organic peroxide,
wherein the UV-curable silicone composition has a viscosity applicable to a stereolithography such as a laser process, can be shaped even with a small amount of UV irradiation, and forms a cured product exhibiting excellent rubber physical properties.

Disclosed are an optical filter including a near infrared absorption layer on a polymer film. The polymer film has a* of about 5.0 to about +5.0 and b* of about 5.0 to about +5.0 in a color coordinate expressed by a CIE Lab color space. The near infrared absorption layer may be configured to transmit light in a visible region and to selectively absorb at least one part of light in a near infrared region. The near infrared absorption layer includes a first near infrared absorption material including a copper phosphate ester compound and a second near infrared absorption material including at least two different organic dyes. The second near infrared absorption material has a maximum absorption wavelength (.sub.max) in a wavelength region of about 650 nm to about 1200 nm. An electronic device may include the optical filter.

A polyvinyl alcohol is produced in a method comprising: a polymerization step comprising polymerizing vinyl ester monomers by controlled radical polymerization in the presence of a radical initiator and an organic cobalt complex to obtain a polymer solution containing a polyvinyl ester; an extraction step comprising extracting a cobalt complex from the polymer solution by contacting an aqueous solution containing a water-soluble ligand with the polymer solution; and a saponification step comprising saponifying the polyvinyl ester after the extraction step to obtain a polyvinyl alcohol. A method for producing a polyvinyl alcohol is thus provided that has a narrow molecular weight distribution and a high number-average molecular weight with good hue and further good solubility in water.

Described herein is a polar non-aqueous dispersion comprising polar polymeric microparticles in a polar non-aqueous medium, the polar polymeric microparticles being insoluble in the medium and being produced by dispersion polymerization of vinyl monomers such as acrylate monomers in the medium in the presence of a polymeric acrylic stabilizer. Inks, coatings and overprint varnishes are formulated that employ the polar non-aqueous dispersion. Such inks, etc., exhibit superior chemical resistance properties, for example in one-part and two-part systems.