Abstract:
PROBLEM TO BE SOLVED: To provide a method for sealing an opening section in a structural member of a structure. SOLUTION: A method for sealing an opening section in a structural member of a structure in order to decrease the volume of smoke passing through the opening section is to substantially fill the opening section in the structural member with a bearing material so that the infilled opening section is formed. In that case, the covering of a silicone composition having 1000-120,000mPa/s measured at 24 deg.C with 2.5rpm is applied to the infilled opening section, the structural member adjacent to the infilled opening section and an optional object passing through the structural member. Then, the silicone composition is solidified, it is made to adhere to the bearing material in the infilled opening section, adjacent structural member and optional object passing through them, and the covering is a continuous elastomer coating with the minimum thickness of 0.25mm having at least ±3% of movability, the infilled opening section is sealed therewith, and it reduces the volume of smoke passing through the infilled opening section.
Abstract:
PROBLEM TO BE SOLVED: To obtain a water-base silicone emulsion which, when dehydrated, forms an elastomer with improved resistances to smoke and fire by selecting a water-base emulsion which contains a disperse phase (A) contg. a product formed from materials including a specific siloxane polymer and a crosslinker selected from among siloxanes, silane compds., etc., water (B), a surfactant (C), and a filler (D). SOLUTION: This emulsion forms an elastomer when dehydrated and contains a disperse phase (A) contg. a product formed from materials including 100 pts.wt. diorganosiloxane polymer (i) and 0.1-20 pts.wt. crosslinker (ii) selected from among linear aminoxy-functional siloxanes represented by the formula (wherein R and R' are each a 1-8C alkyl; (m) is an integer of 1-20; and (n) is an integer of 3-7), etc., and partial hydrolyzates thereof, 50-300 pts.wt. water (B), 0.5-10 pts.wt. anionic or nonionic surfactant (C), and 60-120 pts.wt. filler (D) (e.g. aluminum trihydrate).
Abstract:
PROBLEM TO BE SOLVED: To obtain the subject polymer having a low viscosity and a high functional property even having a high molecular weight, and useful for strengthening a resin, curing of a polysiloxane, a defoaming agent, a raw dissolving agent, a carrier agent and an admixing agent, etc., by polymerizing an organic silicon compound containing a carbinol group and an alkoxy group. SOLUTION: This ultra-branched polymer containing silicon atom is obtained by polymerizing an organic silicon compound of preferably the formula [R and R' are each an alkyl or an aryl; X is an organic group containing an alcoholic group; (a) and (b) are each 1-3] containing (i) one carbinol group and at least 2 alkoxy groups or (ii) one alkoxy group and at least 2 carbinol groups, and preferably removing the alcohol produced as a by-product. The organic silicon compound is preferably a modified amino functional organic silicon compound obtained by reacting a precursor selected from an amino functional silane or an amino functional polysiloxane with a carbonic acid derivative or a cyclic lactone.
Abstract:
PROBLEM TO BE SOLVED: To prolong the service life of a surface drying oil present on a room temperature vulcanizing silicone composition by exposing a mixture containing a drying oil, a specified polymer, a moisture-sensitive crosslinking agent, a filler and particulate zinc oxide to the air. SOLUTION: 100 pts.wt. polymer terminated with a moisture-condensible silyl group is mixed with 0.5-10 pts.wt. drying oil, 0.5-15 pts.wt. moisture-sensitive crosslinking agent having at least two hydrolyzable groups in the molecule, a filler, and optionally a catalyst to obtain a nonacid room-temperature vulcanizing silicone composition. 100 pts.wt. obtained composition is mixed with at least 2 pts.wt. particulate zinc oxide to obtain a composition. This composition is exposed to the air to form a cured composition having a surface drying oil layer having a service life longer than that of a drying layer made from a composition free from zinc oxide.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for neutralizing an acid-containing polyorganosiloxane mixture. SOLUTION: This method for neutralizing a polyorganosiloxane mixture comprises the following three consecutive steps wherein: (A) a mixture comprising polyorganosiloxanes and acid(s) is contacted with a neutralizing amount of a solid organic base at a temperature higher than the melting point of the solid organic base to form a molten organic base to effect formation of an insoluble adduct of the acid(s) and the molten organic base; (B) the mixture temperature is lowered to solidify the remaining molten organic base to a remaining solid organic base; and (C) the insoluble adduct and the remaining solid organic base are separated from the above mixture.
Abstract:
PROBLEM TO BE SOLVED: To provide an aqueous silicone emulsion which, after the evaporation of water, can give a surface-modified elastomeric silicone material having improved coverage and adhesion to paint, being less stained, and having a low coefficient of friction as compared with silicone elastomers obtained from other aqueous emulsions. SOLUTION: This emulsion comprises water (A), particles (B) dispersed in water containing a cross-linked product of a diorganosiloxane polymer, a surfactant (D), and an oxygen-curing compound (C) in an amount effective for surface modification or a salt thereof. When a salt of an oxygen-curing compound with a surfactant is used, it is unnecessary to add surfactant (D) to an emulsion which forms a silicone elastomer when the water is removed therefrom.
Abstract:
PROBLEM TO BE SOLVED: To obtain a nonacid room-temperature-vulcanizing silicone composition which retards discoloration due to the deterioration of the surface mildewproofing agent upon exposure to ultraviolet rays by adding a specified compound to a nonacid room-temperature-vulcanizing silicone composition containing a UV-decomposable mildewproofing agent. SOLUTION: This composition comprises a moisture-condensible silyl- terminated polymer, a moisture-sensitive crosslinking agent, a filler, a UV- decomposable mildewproofing agent and at least 2 pts.wt., per 100 pts.wt. polymer, particulate zinc oxide. It is desirably a composition further containing a curing catalyst, more desirably a composition containing a fluorine compound as a silicone repellent.
Abstract:
Curable compositions contain (i) a polysilane, (ii) a cycloaliphatic epoxide, (iii) a cationic salt photoinitiator, (iv) an electrically conductive filler, and optionally (v) an adhesion promoter. Electrically conductive films can be obtained by UV curing the curable compositions. These electrically conductive films have wide areas of application including use in the manufacture of electroluminescent lamps.
Abstract:
A crosslinked polymer dispersion comprising a preformed polymer, selected from the group consisting of silicon modified organic polymers, mixtures of silicon modified organic polymers, mixtures of silicon modified organic polymer(s) with regular organic polymers, mixtures of silicon modified organic polymer(s) with siloxane polymers, mixtures of organic polymers bearing alkenyl groups with siloxane polymers, mixtures of organic polymers bearing alkenyl groups with silicon modified organic polymers, mixtures of the above polymers and mixtures of the above polymer(s) with organic plasticizers or solvents.
Abstract:
A method of hydrophobicising a filler comprises: (i) contacting a filler of inorganic pigments, metal oxides, metal hydroxides or silicate minerals, with an oxa-sila-cycloalkane in an amt. sufficient for at least a portion of the hydroxyl functionality on the filler to be replaced with carbinol functionality. Also claimed are: (1) a filler prepd. by the above method; and (2) a filler having a surface contg. carbinol functionality of formula (I): R' = 1-6C alkyl, aryl, aralkyl, alkaryl or halohydrocarbon; and R" = -CH2CH(CH3)CH2-, -CH2CH2CH2-, -CH(C6H5)CH2CH2- or -CH2CH2CH2CH2-.