The present invention provides moisture curable network silicone polymers and compositions thereof, having improved resistance to automotive oil at high temperature. The network silicone polymers contain terminal moisture curable functional groups and a partially crosslinking structure that contains C—C—C linkage which separates the siloxane backbone from the moisture curable functional groups and prevent thermal decomposition of siloxane backbone.

A room-temperature-curable organopolysiloxane composition contains as essential components (A) an organopolysiloxane shown by the following general formula (1), (B) an alkoxysilane shown by the following general formula (2) or a partial hydrolysate thereof, (C) a silazane compound shown by the following general formula (3), (D) a bismuth compound shown by the following general formula (4) which is in a liquid state at 20° C., a partial hydrolysate thereof, or both of them, (E) one or more fillers, and (F) a silane coupling agent having amine structure or imine structure, in which the composition satisfies [component (C)/component (B)≧1.0]. As a result, a room-temperature-curable organopolysiloxane composition has good curability and storage stability even without containing an organotin compound or an organotitanium compound, has safety in view of toxicity to the human body and environment, and exhibits good rubber physical properties and adhesion after curing. ##STR00001##

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.

A room-temperature-vulcanizing (RTV) silicone rubber composition having an organopolysiloxane having a hydrolyzable silyl group at the molecular chain end as a base component (base polymer), used in combination with a lactate silane capable of eliminating a lactic acid ester as a crosslinking agent, and blended with a predetermined curing accelerator, etc. can give a cured product (silicone rubber) that exhibits good moisture resistance as well as excellent safety, adhesiveness, curability, and low odor.

A polymer blend including an organic polymer with a reactive silicon-containing group which gives cured objects excellent elongation property and stress relaxation, a composition including the polymer blend, a specific filler, and a curing catalyst, a sealant including the composition; and a sealant for tires, are provided. A polymer blend including an organic polymer with a bifunctional reactive silicon-containing group of a specific structure is mixed with polyoxyalkylene (A). Polyoxyalkylene (A) has an average molecular weight of 13,000 or higher and 100,000 or lower, a reactive-silicon-containing-group equivalent Eqa of 0.010 mmol/g or more and 0.29 mmol/g or less, and contains more than one silicon-containing group per molecule and polyoxyalkylene (B). Polyoxyalkylene (B) has an average molecular weight of 3,000 or higher and 25,000 or lower, a reactive-silicon-containing group only at one end, and a reactive-silicon-containing-group equivalent Eqb of 0.03 mmol/g or more and 0.58 mmol/g or less.

A room-temperature-curable organopolysiloxane composition that contains: 100 parts by mass of the product of reacting (A) a diorganopolysiloxane that is capped at both ends by a hydroxyl group, a hydroxy-group-containing hydrocarbon compound in such an amount as for there to be 0.01-0.5 mol per 1 mol of hydroxyl groups that are bonded to silicon atoms in the diorganopolysiloxane, and platinic chloride hexahydrate in an amount that is 0.01-1 mass % of the total of component (A); (B) 3-300 parts by mass of an inorganic filler; (C) 1-20 parts by mass of an organosilane that has at least 3 hydrolyzable groups per molecule thereof and/or a partial hydrolysis condensate of an organosilane that has at least 3 hydrolyzable groups per molecule thereof; (D) 0.01-5 parts by mass of a condensation cure catalyst; and (E) 0.1-5 parts by mass of a silane coupling agent (excluding component (C) and component (D)). The room-temperature-curable organopolysiloxane composition gives cured products that retain low-elastic-modulus rubber elasticity over long periods of time and do not readily contaminate natural rock, coated aluminum, or the like.

A room-temperature-curable organopolysiloxane composition for an oil seal, wherein an organosilane compound containing a specific organo-oxymethyl group and represented by formula (1) and/or a partial hydrolysis condensate of said compound is used as a curing agent (crosslinking agent), and an organic compound having a guanidine skeleton is added in combination as a curing catalyst.

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(In the formula, each R.sup.1 is independently a C1-12 unsubstituted or substituted monovalent hydrocarbon group, R.sup.2 is a C1-12 unsubstituted or substituted monovalent hydrocarbon group, Y is a hydrolyzable group, and n is 0, 1 or 2.)

It is thus possible to obtain a cured product having good rubber properties, adhesiveness, and engine oil resistance after curing even without containing a metal-based catalyst.

Compositions of curable silicone rubber compounds containing at least one metal siloxane-silanol(-ate) compound, a method for preparing curable silicone rubber compounds containing at least one metal siloxane-silanol(-ate) compound, as well as the use of curable silicone rubber compounds containing at least one metal siloxane-silanol(-ate) compound as a sealant, an adhesive material, a potting compound and/or a coating agent.

The present invention concerns a curable composition, preferably a moisture-curable composition, comprising: a) at least one silane-functional polymer P; and b) at least one metal salt of neodecanoic acid wherein the metal salt is chosen from the group consisting of alkali metal salts and alkali earth metal salts.

A rheology control agent for a curable composition includes: a diamide compound (A) and/or a hydrogenated castor oil (A′), the diamide compound (A) being obtained by condensation reaction between a diamine component (A1) and a monocarboxylic acid component (A2); and a polyamide compound (B) obtained by polycondensation of an amine component (B1) and a carboxylic acid component (B2). The amine component (B1) contains at least one amine selected from the group consisting of a diamine and a triamine having 2 to 54 carbon atoms. The carboxylic acid component (B2) contains at least one carboxylic acid selected from the group consisting of a dicarboxylic acid and a tricarboxylic acid having 4 to 54 carbon atoms. The polyamide compound (B) is obtained by polycondensation of at least one of the amine component (B1) and the carboxylic acid component (B2) containing polymerized fatty acids.