Provided is a curable organopolysiloxane composition which has a particularly excellent effect of improving initial adhesiveness in small amounts and a thin layer with respect to various base materials, in addition to being able to achieve particularly excellent adhesive durability and high adhesive strength after curing. The curable organopolysiloxane composition comprises: (A) an organopolysiloxane having at least two alkenyl groups per one molecule; (B) a trialcoxysilyl containing siloxane having one silicon atom-bonded hydrogen atom and at least one trialcoxysilyl group per one molecule; (C) a chain or cyclic organopolysiloxane having at least two silicon atom-bonded hydrogen atoms per one molecule; (D) a chain organopolysiloxane having at least three silicon atom-bonded hydrogen atoms per one molecule; (E) a catalyst for a hydrosilylation reaction; (F) a catalyst for a condensation reaction; and (G) an adhesion promoter.

Provided is a curable organopolysiloxane composition which has a particularly excellent effect of improving initial adhesiveness in small amounts and a thin layer with respect to various base materials, in addition to being able to achieve particularly excellent adhesive durability and high adhesive strength after curing. The curable organopolysiloxane composition comprises: (A) an organopolysiloxane having at least two alkenyl groups per one molecule; (B) a trialcoxysilyl containing siloxane having one silicon atom-bonded hydrogen atom and at least one trialcoxysilyl group per one molecule; (C) a chain or cyclic organopolysiloxane having at least two silicon atom-bonded hydrogen atoms per one molecule; (D) a chain organopolysiloxane having at least three silicon atom-bonded hydrogen atoms per one molecule; (E) a catalyst for a hydrosilylation reaction; (F) a catalyst for a condensation reaction; and (G) an adhesion promoter.

One of purposes of the present invention is to provide an organopolysiloxane that has a low viscosity and allows a cured coating to achieve both high hardness and crack resistance, and provide a composition comprising the organopolysiloxane. An organopolysiloxane represented by the following average unit formula (1) and having a kinetic viscosity of 10 to 350 mm.sup.2/s at 25° C., wherein a proportion (%) of the number of silicon atoms in a unit represented by the following formula (1′) to a total number of silicon atoms in all siloxane units of the organopolysiloxane is 10% or less,

##STR00001##

wherein R.sup.1, R.sup.2, and R.sup.3 are, independently of each other, an unsubstituted or substituted, cyclic or non-cyclic alkyl group having 1 to 12 carbon atoms that may include an ether bond, or an unsubstituted or substituted aryl group having 6 to 12 carbon atoms, R.sup.4 is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, and a, b, c, d and e are numbers satisfying the equations 0.2≥a≥0, 1≥b>0, 0.75≥c≥0, 0.2≥d≥0 and 1≥e>0, provided that a+b+c+d=1.

One of purposes of the present invention is to provide an organopolysiloxane that has a low viscosity and allows a cured coating to achieve both high hardness and crack resistance, and provide a composition comprising the organopolysiloxane. An organopolysiloxane represented by the following average unit formula (1) and having a kinetic viscosity of 10 to 350 mm.sup.2/s at 25° C., wherein a proportion (%) of the number of silicon atoms in a unit represented by the following formula (1′) to a total number of silicon atoms in all siloxane units of the organopolysiloxane is 10% or less,

##STR00001##

wherein R.sup.1, R.sup.2, and R.sup.3 are, independently of each other, an unsubstituted or substituted, cyclic or non-cyclic alkyl group having 1 to 12 carbon atoms that may include an ether bond, or an unsubstituted or substituted aryl group having 6 to 12 carbon atoms, R.sup.4 is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, and a, b, c, d and e are numbers satisfying the equations 0.2≥a≥0, 1≥b>0, 0.75≥c≥0, 0.2≥d≥0 and 1≥e>0, provided that a+b+c+d=1.

A composition is provided that includes a graphene dispersion, a silicone microemulsion, a reactive siloxane emulsion, and water as a majority by weight of the composition. A process for imparting a durable shine to a vehicle surface is also provided. The composition is applied to the vehicle surface. The water is allowed to evaporate from the composition to form a coating imparting a durable shine to the vehicle surface. A coating is obtained after evaporation. The coating includes a silicone film formed by the evaporation of water from a silicone microemulsion and the cross-linking of a siloxane from an emulsion. Graphene particles are embedded in the silicone film. The coating has a thickness of between having a thickness of between 5 and 10,000 nanometers and a hardness of between 3 and 7 GPa.

A composition is provided that includes a graphene dispersion, a silicone microemulsion, a reactive siloxane emulsion, and water as a majority by weight of the composition. A process for imparting a durable shine to a vehicle surface is also provided. The composition is applied to the vehicle surface. The water is allowed to evaporate from the composition to form a coating imparting a durable shine to the vehicle surface. A coating is obtained after evaporation. The coating includes a silicone film formed by the evaporation of water from a silicone microemulsion and the cross-linking of a siloxane from an emulsion. Graphene particles are embedded in the silicone film. The coating has a thickness of between having a thickness of between 5 and 10,000 nanometers and a hardness of between 3 and 7 GPa.

A composition is provided that includes a graphene dispersion, a silicone microemulsion, a reactive siloxane emulsion, and water as a majority by weight of the composition. A process for imparting a durable shine to a vehicle surface is also provided. The composition is applied to the vehicle surface. The water is allowed to evaporate from the composition to form a coating imparting a durable shine to the vehicle surface. A coating is obtained after evaporation. The coating includes a silicone film formed by the evaporation of water from a silicone microemulsion and the cross-linking of a siloxane from an emulsion. Graphene particles are embedded in the silicone film. The coating has a thickness of between having a thickness of between 5 and 10,000 nanometers and a hardness of between 3 and 7 GPa.

A composition is provided that includes a graphene dispersion, a silicone microemulsion, a reactive siloxane emulsion, and organic solvent as a majority by weight of the composition. A process for imparting a durable shine to a vehicle surface is also provided. The composition is applied to the vehicle surface. The water is allowed to evaporate from the composition to form a coating imparting a durable shine to the vehicle surface. A coating is obtained after evaporation. The coating includes a silicone film formed by the evaporation of water from a silicone microemulsion and the cross-linking of a siloxane from an emulsion. Graphene particles are embedded in the silicone film. The coating has a thickness of between having a thickness of between 5 and 10,000 nanometers and a hardness of between 3 and 7 GPa.

A composition is provided that includes a graphene dispersion, a silicone microemulsion, a reactive siloxane emulsion, and organic solvent as a majority by weight of the composition. A process for imparting a durable shine to a vehicle surface is also provided. The composition is applied to the vehicle surface. The water is allowed to evaporate from the composition to form a coating imparting a durable shine to the vehicle surface. A coating is obtained after evaporation. The coating includes a silicone film formed by the evaporation of water from a silicone microemulsion and the cross-linking of a siloxane from an emulsion. Graphene particles are embedded in the silicone film. The coating has a thickness of between having a thickness of between 5 and 10,000 nanometers and a hardness of between 3 and 7 GPa.

A composition is provided that includes a graphene dispersion, a silicone microemulsion, a reactive siloxane emulsion, and organic solvent as a majority by weight of the composition. A process for imparting a durable shine to a vehicle surface is also provided. The composition is applied to the vehicle surface. The water is allowed to evaporate from the composition to form a coating imparting a durable shine to the vehicle surface. A coating is obtained after evaporation. The coating includes a silicone film formed by the evaporation of water from a silicone microemulsion and the cross-linking of a siloxane from an emulsion. Graphene particles are embedded in the silicone film. The coating has a thickness of between having a thickness of between 5 and 10,000 nanometers and a hardness of between 3 and 7 GPa.