Curable polyorganosiloxane compositions

Abstract

Polyorganosiloxane compositions comprising: (A) a polyorganosiloxane having two or more of the following unit, in the molecule, represented by the formula: ##EQU1## wherein, R.sup.1 represents an alkenyl radical; R.sup.2 represents a substituted or unsubstituted monovalent hydrocarbon radical having no unsaturated aliphatic bond; a is an integer of 1 of 2; b is an integer of 0 to 2; and a+b is an integer of 1 to 3; (B) a polyorganohydrogensiloxane, having units represented by the formula: ##EQU2## wherein, R.sup.3 represents a substituted or unsubstituted monovalent hydrocarbon radical; c is an integer of 0 to 2; d is an integer of 1 or 2; and c+d is an integer of 1 to 3, and having at least three hydrogen atoms bonded to silicon atoms in a molecule, in an amount such that the number of the hydrogen atoms bonded to silicon atoms may be 0.5 to 4.0 per R.sup.1 radical contained in polyorganosiloxane (A); (C) a catalyst selected from the group consisting of platinum and platinum compounds, in an amount of 1 to 100 ppm in terms of platinum atom relative to polyorganosiloxane (A); and (D) anthraquinone dyes and/or azo dyes, wherein the amount is from 1 to 2,000 ppm relative to polyorganosiloxane (A).

Dependencies are inferred from the claim text.