Compositions based on HA and HAp in the field of soft tissue fillers, and a method of manufacturing thereof. Optionally, the dermal fillers are useful for enhancing facial tissue augmentation by adding volume to facial tissue, correct wrinkles and folds and restore a smooth appearance to the face. Optionally, the dermal filler comprises uncrosslinked or crosslinked HA chemically bonded to HAp.

A particle dispersion, containing: particles; and a liquid medium, in which a distance of a HSP value of the particles with respect to a HSP value of the liquid medium is 5.50 MPa.sup.0.5 or less.

Silica particles have a dielectric loss tangent of 0.01 or less at 1 GHz and satisfy the requirements (i), (ii) and (iii): (i) an average primary particles diameter of 5 nm to 120 nm; (ii) a ratio of a specific surface area by water vapor adsorption (S.sub.H2O) to a specific surface area by nitrogen adsorption (S.sub.N2); i.e., (S.sub.H2O/S.sub.N2) of 0.6 or less; and (iii) a total silanol group content of 5% or less as determined by the following Formula (1): total silanol group content (%)=(Q22/4+Q31/4+Q40/4) . . . Formula (1) [in Formula (1), each of Q2, Q3 and Q4 is the proportion (%) of the peak areas derived from silicon atom structures], and a silica dispersion.

Surface treated silica-containing particles are combined with a resin to form a liquid prepolymer composition for use in additive manufacturing. A surface treatment on the silica-containing particles may participate in polymerization of the composition. The silica containing particles may be colloidal silica or a silica polymer composite particle.

The present disclosure provides curable compositions comprising polymerization inhibitor-functionalized particles to prevent undesired polymerization of the polymerizable compounds in the curable compositions during their transportation, handling or storage, or during 3D printing processes. Such curable compositions can be used to produce polymeric materials with properties suitable for use in various 3D printed objects, such as orthodontic appliances.

Silica-based hydrophobic granular material with an increased polarity Silica-based granular material, comprising silica and at least one IR-opacifier, hydrophobized with a surface treatment agent comprising a silicon atom, wherein the granular material has: a) a cumulative pore volume of pores>4 nm of more than 2.5 cm.sup.3/g, as determined by the mercury intrusion method according to DIN ISO 15901-1; b) a tamped density of 140 g/L to 290 g/L; c) a number of silanol groups relative to BET surface area d.sub.SiOH of at least 0.5 SiOH/nm.sup.2, as determined by reaction with lithium aluminium hydride. d) a number of silicon atoms in the surface treatment agent relative to BET surface area d.sub.[Si] of at least 1.0 [Si atoms]/nm.sup.2.

A cristobalite includes: a d50 particle size selected within a range of from 1 m to 15 m; an L color coordinate of greater than 96; a color coordinate of less than 1; and a b color coordinate of 1 or less, in which the cristobalite is a powder. Also provided are compositions containing the cristobalite, coatings formed with compositions, and methods of preparing cristobalite.

A millable silicone rubber compound including: (A) organopolysiloxane raw rubber; (B) reinforcing silica having a specific surface area of 50 to 450 m.sup.2/g; (C) a partial hydrolysate of organoalkoxysilane represented by the following general formula (1); and (D) one or more kinds of condensation reaction catalysts selected from the following (D1) to (D3): (D1) an amine compound having a boiling point of 30 to 60 C. at 1013 hPa, the amine compound being in a liquid state at 25 C., (D2) hexaorganodisilazane represented by the following general formula (2), and (D3) ammonia water at 1.0 to 30.0 mass %. Thus, the invention provides: a millable silicone rubber compound that enable to achieve high plasticity regardless of relatively low hardness of the millable silicone rubber compound, a millable silicone rubber composition, and a method for producing a millable silicone rubber composition.

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Surface-treated spherical silica, having a median diameter d50 of 0.5 m to 20 m, a product Ad50 of a BET specific surface area A (m.sup.2/g) and the median diameter d50 (m) being 2.7 (m.Math.m.sup.2/g) to 5.0 (m.Math.m.sup.2/g), a peak area of an amine in chromatography being 70% or more of a theoretical value, and a symmetry coefficient S of 8 or less in the chromatography.