Moisture curable compositions having a low modulus and a high resilience are prepared by curing a composition containing a first polymer which predominately contains two moisture-curable silyl groups, and a second polymer which is terminated by an alkoxy group and contains but a single moisture-curable silyl group, or a hydroxyl group.

According to the present invention, a siliceous film forming composition, which is capable of filling trenches having narrow widths and high aspect ratios and forming a thick film, can be provided. A siliceous film forming composition comprising: (a) a block copolymer comprising a linear and/or cyclic block A having a polysilane skeleton comprising 5 or more silicon and a block B having a polysilazane skeleton comprising 20 or more silicon, and (b) a solvent.

A polysiloxazane compound including a repeating unit of the following general formula (1), and having a number average molecular weight of 500 to 100,000 as measured by gel permeation chromatography versus polystyrene standards, ##STR00001##
wherein R.sup.1 and R.sup.2 each independently represent a substituted or unsubstituted C.sub.1-C.sub.50 monovalent hydrocarbon group optionally containing a hetero atom, Xs each independently represent a methyl group, an oxygen atom, NH—SiX.sub.2, or (NH).sub.(3-r)/2—SiR.sup.1R.sup.2.sub.r (R.sup.1 and R.sup.2 have the same meaning as provided above), or Xs are joined to one another to represent an oxygen atom, n is an integer of 0 to 8, when the number of NH—SiX.sub.2 is denoted by p, p satisfies 0≤p/(2n+4)≤0.5, r is an integer of 0, 1, or 2, and a and b are numbers satisfying 0<a≤1, 0≤b<1, and a+b=1.

A polysiloxazane compound including a repeating unit of the following general formula (1), and having a number average molecular weight of 500 to 100,000 as measured by gel permeation chromatography versus polystyrene standards, ##STR00001##
wherein R.sup.1 and R.sup.2 each independently represent a substituted or unsubstituted C.sub.1-C.sub.50 monovalent hydrocarbon group optionally containing a hetero atom, Xs each independently represent a methyl group, an oxygen atom, NH—SiX.sub.2, or (NH).sub.(3-r)/2—SiR.sup.1R.sup.2.sub.r (R.sup.1 and R.sup.2 have the same meaning as provided above), or Xs are joined to one another to represent an oxygen atom, n is an integer of 0 to 8, when the number of NH—SiX.sub.2 is denoted by p, p satisfies 0≤p/(2n+4)≤0.5, r is an integer of 0, 1, or 2, and a and b are numbers satisfying 0<a≤1, 0≤b<1, and a+b=1.

A silicone water vapor barrier film is provided. The silicone water vapor barrier film includes a polyethylene terephthalate film; an inorganic coating layer disposed on a surface of the polyethylene terephthalate film; and a first silicone resin layer disposed on another surface of the polyethylene terephthalate film opposite to the inorganic coating layer. The first silicone resin layer is formed by curing a first curable silicone resin composition. The water vapor transmission rate (WVTR) of the silicone water vapor barrier film of the present invention is not greater than 0.5 gm.sup.−2 day.sup.−1, the coefficient of thermal expansion (CTE) at 25° C. to 50° C. of the silicone water vapor barrier film is in the range of 5 ppm/° C. to 10 ppm/° C., and the visible light transmittance of the silicone water vapor barrier film is greater than 93%.

The present invention relates to a modified siloxane resin, a crosslinked modified siloxane resin, and a method for preparing the crosslinked resin. More specifically, the present invention relates to a modified siloxane resin, a crosslinked modified siloxane resin with excellent superhydrophobicity obtained by dual curing of the resin, and a method for preparing the crosslinked resin. The use of the modified siloxane resin according to the present invention allows the crosslinked modified siloxane resin to have excellent superhydrophobicity and high hardness. The water repellency of the crosslinked resin can be appropriately controlled by varying the amount of the siloxane resin mixed.

Herein polymers and particles which comprise a plurality of dihydropyridazine or hydropyridazine functional groups are described. Methods for their formation and specific monomers which may be used in their formation are also described. The polymers and particles are UV absorbing, hydrogen-donor antioxidant materials which signal a depletion of antioxidant ability by a decrease in visible fluorescence. These polymers and particles may be used as UV protectants for a variety of materials and substrates and may even be used in a topically applied formulation for human skin.

Polymers comprising at least one cationic functional group and at least one ultraviolet light-absorbing compound are disclosed herein. The polymers exhibit ultraviolet light-absorbing properties and may be used in sunscreen compositions for skin and/or hair.

Polymers comprising at least one cationic functional group and at least one ultraviolet light-absorbing compound are disclosed herein. The polymers exhibit ultraviolet light-absorbing properties and may be used in sunscreen compositions for skin and/or hair.

A silirane-functionalized compound, a process for preparing the same, and a process for preparing siloxanes using a silirane-functionalized compound are described herein.