A room-temperature curable organopolysiloxane composition is provided, which includes (A) an organopolysiloxane with the terminals blocked with a hydroxyl group, a hydrolysable group, or both these types of groups, and (B) an organosilicon compound containing a hydrolysable group, a partial hydrolysis-condensation product thereof, or a mixture of the two, and (C) a polysiloxane containing an oxyalkylene group bonded to a silicon atom via, for example, a C—C—Si linkage. Application of this composition to an underwater structure is able to generate an antifouling coating that is effective in preventing the adhesion and growth of aquatic organisms on the surface of the underwater structure, and displays superior long term endurance of this antifouling effect.

Room temperature curable organopolysiloxane composition

A room temperature-curing organopolysiloxane composition including (A) 100 parts by weight of at least one of two specific organopolysiloxanes; (B) 0.1 to 30 parts by weight of a silane compound having in its molecule an average of at least two Si-bonded hydrolyzable groups and in which the remaining Si-bonded group(s) is/are a group(s) selected from the group consisting of methyl, ethyl, propyl, vinyl and phenyl groups; a partial hydrolysis-condensation product thereof; or a mixture of these; and (C) 0.1 to 10 parts by weight of a mixture of siloxanes having degrees of polymerization of 2 to 10. The mixture of siloxanes is a partial hydrolysis-condensation product of a silane compound having a group selected from amino, epoxy, mercapto, acryloyl and methacryloyl groups each bonded to the silicon atom through a carbon atom and having a Si-bonded hydrolyzable group. The composition has superior adhesion to various resins.

Room-temperature curing organopolysiloxane composition

A room temperature curable organopolysiloxane composition comprising (A) an organopolysiloxane having organooxysilyl groups on side chains or on side chains and ends of the polymer, (B) fumed silica, (C) an organooxysilane or a partial hydrolytic condensate thereof, and (D) a condensation catalyst is improved in stability during storage under sealed conditions and cures into an elastomeric product whose physical properties change little even when used under rigorous conditions as encountered in proximity to automotive engines.

Room temperature curable organopolysiloxane compositions

Precipitated silicas which have a broad pore size distribution of the pores with a pore diameter smaller than that of the maximum of the derivative of the pore volume distribution function are useful, for example, for tires.

Precipitated silicas with a particular pore size distribution

This invention provides metal oxide particles surface-treated with a hydrophobicity-imparting agent, methods of making such, and toner compositions comprising the same.

Hydrophobic-treated metal oxide

The invention relates to hydrophobicized precipitated silicas that possess an extremely high whiteness and extremely low moisture absorption. The hydrophobic precipitated silicas are prepared, inter alia, by coating with silicone oil and oxidative heat treatment.

High-whiteness hydrophobic precipitated silica with ultralow moisture absorption

Production of hydrophobic precipitated silica comprises conditioning a mixture of precipitated silica and an organopolysiloxane at 10-150 degrees C for 0.5-72 hours and treating the product with an oxidizing gas at a temperature above 300 degrees C. An Independent claim is also included for hydrophobic precipitated silica with a carbon content of more than 3.1%, a methanol wettability of more than 60%, a remission of more than 94%, a dibutyl phthalate absorption of less than 230 g/100 g, a BET surface area of 50-110 m /g, a CTAB surface area of more than 30 m /g and a water vapor absorption of 1.1 plus or minus 0.2% at 30 degrees C and 30% relative humidity and 1.4 plus or minus 0.3% at 30 degrees C and 70% relative humidity.

Hydrophobic precipitated silica with high whiteness and low moisture absorbance

PROBLEM TO BE SOLVED: To provide hydrophobic precipitated silica, to provide a production method therefor, and to provide its use. SOLUTION: In the production of the hydrophobic precipitated silica, a) a mixture consisting of an organopolysiloxane derivative and precipitated silica is produced, and b) the conditioning of the mixture is performed at 10 to 150 deg.C for 0.5 to 72 hr, and c) oxidation heating treatment is performed at >300 deg.C by using an oxidizing gas. Thus, the hydrophobic precipitated silica which has a remarkably high whiteness and a remarkably low water absorption percentage can be obtained.

Hydrophobic precipitated silica, production method therefor, and its use

The invention relates to hydrophobicized precipitated silicas that possess an extremely high whiteness and extremely low moisture absorption The hydrophobic precipitated silicas are prepared, inter alia, by coating with silicone oil and oxidative heat treatment

High-whiteness hydrophobic preciptated silica with ultralow moisture absorption

A method for the production of waterproof precipitated silica (I) involves (a) making a mixture of an organopolysiloxane derivative (II) and precipitated silica (III), (b) conditioning the mixture at 10-150 degrees C for 0.5-72 hours and (c) oxidative tempering at above 300 degrees C with an oxidizing gas.

Ralf Dr. Schmoll

Papers

High-whiteness hydrophobic precipitated silica with ultralow moisture absorption

Hydrophobic precipitated silica with high whiteness and low moisture absorbance

Hydrophobic precipitated silica, production method therefor, and its use

High-whiteness hydrophobic preciptated silica with ultralow moisture absorption

Hydrophobic precipitated silicone dioxide with high whiteness and super-low hydroscopicity