Abstract: A primer composition comprising:(A) 100 parts by weight of copolymer obtained by reacting(1) an acrylic compound represented by the following general formula: ##STR1## wherein R.sup.1 and R.sup.2 respectively represent groups selected from the group consisting of a hydrogen atom and monovalent substituted or non-substituted hydrocarbon group; with(2) a silane compound represented by the following formula: ##STR2## wherein R.sup.3 represents a group selected from the group consisting of a hydrogen atom and monovalent substituted or non-substituted hydrocarbon groups, R.sup.4 represents a monovalent substituted or non-substituted hydrocarbon group, and Q.sup.1 represents a divalent hydrocarbon group having 1 to 6 carbon atoms,in the weight ratio of 0.1 to 1,000 wt % with respect to the component (1), in the presence of a free-radical initiator;(B) 0.

Abstract: Disclosed is a curable polyorganosiloxane composition which comprises:(A) 100 parts by weight of a polyorganosiloxane having at least two units represented by the following formula in the molecule: ##STR1## wherein R.sup.1 represents an alkenyl group, R.sup.2 represents a substituted or unsubstituted monovalent hydrocarbon group containing no aliphatically unsaturated bond, a is an integer of 1 or 2, b is an integer of 0 to 2, with a+b being an integer of 1 to 3);(B) a polyorganohydrogensiloxane having a unit represented by the following formula and also having at least 3 hydrogen atoms bonded to silicon atoms in the molecule: ##STR2## wherein R.sub.3 represents a substituted or unsubstituted monovalent hydrocarbon group, c is an integer of 0 to 2, d is an integer of 1 or 2, with c+d being an integer of 1 to 3, in an amount such that the number of hydrogen atoms bonded to silicon atoms may be from 0.5 to 4.0 per R.sup.1 in polyorganosiloxane (A);(C) 0.

Abstract: Polyorganosiloxane compositions comprising:(A) a linear and/or branched polyorganosiloxane, with a viscosity of 50 to 100,000 cP at 25.degree. C., wherein 0.7 to 1.8 vinyl radicals bonded to silicon atoms, on average, are present in each molecule, and the remaining organic radicals bonded to silicon atoms are substituted or unsubstituted monovalent hydrocarbon radicals which does not include unsaturated aliphatic radicals, and 30% or more portion of the molecules has only one silicon-bonded vinyl radical in the molecule;(B) a polyorganohydrogensiloxane, wherein more than two hydrogen atoms bonded to silicon atoms, on average, are present in each molecule, in an amount such that the number of silicon-bonded hydrogen atoms may be 0.5 to 5 per vinyl radical in the molecule (A);(C) a catalytic amount of platinum compounds; and(D) anthraquinone dyes and/or azo dyes, in an amount from 1 to 2,000 ppm to (A).