Novel functionalized rubbers having low hysteresis and good compatibility with fillers, such as carbon black and silica, have been synthesized. These functionalized rubbers, including functionalized polybutadiene rubber and functionalized styrene-butadiene rubber, can be beneficially used in making a wide variety of rubber products that have enhanced physical properties. These improved properties are realized because the functional groups therein improve compatibility with reinforcing fillers that are typically included in such rubber compounds. These functionalized rubbers are comprised of polymer chains of the structural formula:

##STR00001##

wherein Polydiene represents a polymer chain which is comprised of at least one diene monomer and wherein R.sup.1 and R.sup.2 can be the same or different and represent alkyl groups containing form 1 to 8 carbon atoms. These rubbers can also be functionally terminated with a silicon containing terminator.

Novel functionalized rubbers having low hysteresis and good compatibility with fillers, such as carbon black and silica, have been synthesized. These functionalized rubbers, including functionalized polybutadiene rubber and functionalized styrene-butadiene rubber, can be beneficially used in making a wide variety of rubber products that have enhanced physical properties. These improved properties are realized because the functional groups therein improve compatibility with reinforcing fillers that are typically included in such rubber compounds. These functionalized rubbers are comprised of polymer chains of the structural formula:

##STR00001##

wherein Polydiene represents a polymer chain which is comprised of at least one diene monomer and wherein R.sup.1 and R.sup.2 can be the same or different and represent alkyl groups containing form 1 to 8 carbon atoms. These rubbers can also be functionally terminated with a silicon containing terminator.

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.

##STR00001##

(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.

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.

##STR00001##

(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.

The copolymer contains an aromatic vinyl monomer unit, and structural units represented by the following formulas (1) to (4), and, based on 100% by mass of a total amount of these structural units, a content C1 of the formula (1) is 0% by mass or more and 3% by mass or less; a content C2 of the formula (2) is 2% by mass or more and less than 20% by mass; a content C3 of the formula (3) is 4% by mass or more and 80% by mass or less; a content C4 of the formula (4) is 2% by mass or more and 80% by mass or less; and a total of the contents C1 and C2 is 3% by mass or more and less than 20% by mass:

##STR00001##

The copolymer contains an aromatic vinyl monomer unit, and structural units represented by the following formulas (1) to (4), and, based on 100% by mass of a total amount of these structural units, a content C1 of the formula (1) is 0% by mass or more and 3% by mass or less; a content C2 of the formula (2) is 2% by mass or more and less than 20% by mass; a content C3 of the formula (3) is 4% by mass or more and 80% by mass or less; a content C4 of the formula (4) is 2% by mass or more and 80% by mass or less; and a total of the contents C1 and C2 is 3% by mass or more and less than 20% by mass:

##STR00001##

A two-part moisture cure organosiloxane composition is disclosed. The two-part moisture cure organosiloxane composition comprises a base component and a catalyst package. The catalyst package undergoes minimal phase separation during storage.

A two-part moisture cure organosiloxane composition is disclosed. The two-part moisture cure organosiloxane composition comprises a base component and a catalyst package. The catalyst package undergoes minimal phase separation during storage.

Provided is an organic-inorganic composite resin composition for coating the surface of a zinc-plated steel sheet, comprising 5-25 wt % of a polymer resin, 4-20 wt % of a silane compound, 3-10 wt % of a curing agent and 0.1-2 wt % of ferrocene compound on the basis of the total weight of the composition.

Provided is an organic-inorganic composite resin composition for coating the surface of a zinc-plated steel sheet, comprising 5-25 wt % of a polymer resin, 4-20 wt % of a silane compound, 3-10 wt % of a curing agent and 0.1-2 wt % of ferrocene compound on the basis of the total weight of the composition.