Polyorganosiloxane composition for use in adhesion of a polyphenylene sulfide resin

A method of adhering a polyphenylene sulfide resin and a cured product of a polyorganosiloxane composition, the method comprising:

• applying the polyorganosiloxane composition to the polyphenylene sulfide resin;
• and
• curing the polyorganosiloxane composition;
• wherein the polyorganosiloxane composition comprises:
• (A) a polyorganosiloxane containing two or more alkenyl groups per molecule;
• (B) a polyorganohydrogensiloxane having three or more hydrogen atoms bonded to silicon atoms per molecule;
• (C) a platinum catalyst;
• (D) an oxide or carbonate of a metal selected from metals belonging to Groups 2 and 12 of the Periodic Table;
• and
• (E) an adhesion imparting agent,
• wherein the content of the component (D) in the whole composition is 0.1 to 20% by weight,
• wherein the component (D) is selected from the group consisting of magnesium oxide, calcium carbonate, and zinc oxide, and
• wherein the component (A) is a combination of (A1) a linear polyorganosiloxane having both ends blocked by an R3SiO1/2 unit and having an R22SiO2/2 unit as an intermediate unit, and having a viscosity of 0.1 to 500 Pas at 23° C., and (A2) a branched polyorganosiloxane comprising an SiO4/2 unit and an R3SiO1/2 unit and optionally further comprising at least one unit selected from the group consisting of an R2SiO2/2 unit and/or an RSiO3/2 unit, wherein, in the above formulae, R is R1 or R2, wherein R1 is an alkenyl group, R2 is a monovalent hydrocarbon group having no aliphatic unsaturated bond, and two or more R1's are contained per molecule.