The present invention relates to a thermosetting composition characterized in that it contains (A) a polyester resin of number average molecular weight 1,000-10,000, hydroxyl value 5-200 mg KOH/g and, (B) 0.5-2.0 equivalents relative to the hydroxyl groups of the aforesaid component (A) of a compound (B) which is a blocked aliphatic isocyanate compound having reactivity with the hydroxyl groups of component (A), wherein the blocking is with methyl ethyl ketoxime and/or ε-caprolactam, (C) 0.05-5 parts by weight of a bismuth compound, per 100 parts by weight of total resin solids of component (A) and component (B), and (D) 0.5-50 parts by weight of an organosilicate represented by the following general formula (I) and/or a condensation product thereof, relative to 100 parts by weight of total resin solids of component (A) and component (B) wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 in the formula each mean hydrogen atom or 1-10 carbon organic group, and can be the same or different, n is 1. By using the thermosetting, not only does stain resistance appear a short time after painting, but also excellent stain resistance is maintained for a long period, which fulfil the paint film performance requirements for painted steel sheet such as water resistance and bending workability and which have high environmental protection qualities and safety. ##STR00001##

The present invention relates to a thermosetting composition characterized in that it contains (A) a polyester resin of number average molecular weight 1,000-10,000, hydroxyl value 5-200 mg KOH/g and, (B) 0.5-2.0 equivalents relative to the hydroxyl groups of the aforesaid component (A) of a compound (B) which is a blocked aliphatic isocyanate compound having reactivity with the hydroxyl groups of component (A), wherein the blocking is with methyl ethyl ketoxime and/or ε-caprolactam, (C) 0.05-5 parts by weight of a bismuth compound, per 100 parts by weight of total resin solids of component (A) and component (B), and (D) 0.5-50 parts by weight of an organosilicate represented by the following general formula (I) and/or a condensation product thereof, relative to 100 parts by weight of total resin solids of component (A) and component (B) wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 in the formula each mean hydrogen atom or 1-10 carbon organic group, and can be the same or different, n is 1. By using the thermosetting, not only does stain resistance appear a short time after painting, but also excellent stain resistance is maintained for a long period, which fulfil the paint film performance requirements for painted steel sheet such as water resistance and bending workability and which have high environmental protection qualities and safety. ##STR00001##

The invention relates to a method for checking the silanization of pale-colored fillers, where a mixture comprising at least one silanized pale-colored filler, preferably silanized silica, and comprising at least one rubber is irradiated with ultrasound waves in a frequency range of 4 to 10 MHz, preferably of 5 to 7 MHz, and the signal strength of the ultrasound waves is determined after transmission through the rubber mixture, where the relative attenuation coefficient α.sub.rel of the rubber mixture in the frequency range of the ultrasound waves is determined, the standard deviation σ of the relative attenuation coefficient α.sub.rel is determined, and α.sub.rel and σ are used for detection of incipient crosslinking of the rubber mixture.

The invention relates to a method for checking the silanization of pale-colored fillers, where a mixture comprising at least one silanized pale-colored filler, preferably silanized silica, and comprising at least one rubber is irradiated with ultrasound waves in a frequency range of 4 to 10 MHz, preferably of 5 to 7 MHz, and the signal strength of the ultrasound waves is determined after transmission through the rubber mixture, where the relative attenuation coefficient α.sub.rel of the rubber mixture in the frequency range of the ultrasound waves is determined, the standard deviation σ of the relative attenuation coefficient α.sub.rel is determined, and α.sub.rel and σ are used for detection of incipient crosslinking of the rubber mixture.

Provided is a curable organopolysiloxane composition having: high thermal conductivity, excellent deep curability under room temperature, excellent adhesion to various base materials, and excellent tight fitting properties to heat dissipating components and the like; a thermally conductive member containing the same; and a heat dissipating structure using the same. A multicomponent curable organopolysiloxane composition comprises: a diorganopolysiloxane with a molecular terminal blocked by a hydroxysilyl group; (B) a diorganopolysiloxane with a molecular terminal blocked by an alkoxysilyl group; (C) a thermally conductive filler; (D) an organic silicon compound serving as a surface treating agent of component (C); (E) a component selected from alkylalkoxysilanes and specific adhesion-imparting agents; and (F) a catalytic amount of a condensation-reaction catalyst.

Provided is a curable organopolysiloxane composition having: high thermal conductivity, excellent deep curability under room temperature, excellent adhesion to various base materials, and excellent tight fitting properties to heat dissipating components and the like; a thermally conductive member containing the same; and a heat dissipating structure using the same. A multicomponent curable organopolysiloxane composition comprises: a diorganopolysiloxane with a molecular terminal blocked by a hydroxysilyl group; (B) a diorganopolysiloxane with a molecular terminal blocked by an alkoxysilyl group; (C) a thermally conductive filler; (D) an organic silicon compound serving as a surface treating agent of component (C); (E) a component selected from alkylalkoxysilanes and specific adhesion-imparting agents; and (F) a catalytic amount of a condensation-reaction catalyst.

Provided is a curable organopolysiloxane composition having: high thermal conductivity, excellent deep curability under room temperature, excellent adhesion to various base materials, and excellent tight fitting properties to heat dissipating components and the like; a thermally conductive member containing the same; and a heat dissipating structure using the same. A multicomponent curable organopolysiloxane composition comprises: a diorganopolysiloxane with a molecular terminal blocked by a hydroxysilyl group; (B) a diorganopolysiloxane with a molecular terminal blocked by an alkoxysilyl group; (C) a thermally conductive filler; (D) an organic silicon compound serving as a surface treating agent of component (C); (E) a component selected from alkylalkoxysilanes and specific adhesion-imparting agents; and (F) a catalytic amount of a condensation-reaction catalyst.

The composition of the present invention is a mixed composition including at least one metal compound (G) selected from a metal compound represented by the following formula (G1) and a condensate thereof, a polysilazane (F), and a compound (H) including a siloxane chain. M(R.sup.g10).sub.r(A.sup.g1).sub.m-r (G1) wherein M represents Al, Fe, In, Ge, Hf, Si, Ti, Sn, Zr, or Ta, R.sup.g10 represents a hydrocarbon chain-containing group or a hydrogen atom, r is 0 or 1, a plurality of A.sup.g1 each independently represent a hydrolyzable group, and m is an integer of 3 to 5 in accordance with the metal atom M.

The composition of the present invention is a mixed composition including at least one metal compound (G) selected from a metal compound represented by the following formula (G1) and a condensate thereof, a polysilazane (F), and a compound (H) including a siloxane chain. M(R.sup.g10).sub.r(A.sup.g1).sub.m-r (G1) wherein M represents Al, Fe, In, Ge, Hf, Si, Ti, Sn, Zr, or Ta, R.sup.g10 represents a hydrocarbon chain-containing group or a hydrogen atom, r is 0 or 1, a plurality of A.sup.g1 each independently represent a hydrolyzable group, and m is an integer of 3 to 5 in accordance with the metal atom M.

A mixed composition including an organosilicon compound (A) in which at least one trialkylsilyl group-containing molecular chain and at least one hydrolyzable group are bonded to a silicon atom, a metal compound (B), an acid (C), and water (D), in which a ratio [D/(A+B)] of a molar amount of the water (D) to a total molar amount of the organosilicon compound (A) and the metal compound (B) is 3.1 to 130.