TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The polyorganosiloxane composition further comprises a curing agent, where the curing agent includes at least two silicon-hydrogen bonds, which are present at 0.5-2 moles/1 mole of a double bond of the first polyorganosiloxane resin and the second polyorganosiloxane resin; and a hydrosilation catalyst. Preferred Components: The second polyorganosiloxane resin is of formula ((R7SiO3/2)t-(R8R9SiO)d)(R10R11R12SiO1/2)m) (III), where greater than or equal to 10% of R7-R12 in (III) and greater than or equal to 30% in (II) includes an aryl group. The first polyorganosiloxane resin has a number average molecular weight of 900-20000. The first polyorganosiloxane resin is present at 10-25 parts by weight and the second polyorganosiloxane resin is present at 40-75 parts by weight, based on the total amount of the polyorganosiloxane composition.R7-R12 = 1-10C alkyl, 3-20C cycloalkyl, 6-20C aryl, 7-20C arylalkyl, 1-20C heteroalkyl, 2-20C heterocycloalkyl, 2-20C alkenyl, 2-20C alkynyl, 1-10C alkoxy (all optionally substituted) and/or halo, provided that at least one of R10, R11 and R12 is 2-20C alkenyl;t, m = greater than 0;d = greater than or equal to 0; and(t+d+m) = 1. Preferred Definitions:    A = substituted bicyclo(2.2.1)heptyl moiety of formula (a1), substituted octahydro-4,7-methano-indenyl moiety of formula (a2), substituted phenyl moiety of formula (a3) or (a4) or substituted naphthyl moiety of formula (a5);    L1-L10 = 1-30C alkylene, 3-30C cycloalkylene, 6-30C arylene, 7-30C arylalkylene, 1-30C heteroalkylene, 2-30C heterocycloalkylene, 2-30C alkenylene (all optionally substituted) and/or single bond; and    E1 = single bond, O, sulfonyl, methylene, ethylene, propylene and/or hexafluoropropylene.    EXAMPLE - Dicyclopentadiene (158.65 g) was added to toluene (600 g) in a five-necked flask with an agitator, a temperature controller, a nitrogen gas-injector, a cooler, and a Dean-Stark trap, while nitrogen was flowed through it and dissolved in it. Then, PS-CS-1.8CS (unicore) was added to it, so that the reaction solution had a platinum concentration of 20 ppm. The solution prepared by dissolving 3,3-diphenyl-1,1,5,5-tetramethyltrisiloxane (332 g) in toluene (600 g) was slowly added dropwise into the above solution for 30 minutes. Then, the reaction solution was heated for reflux for 24 hours. The resulting reaction solution was passed through a 5 cm-thick silica gel column to remove a platinum complex. The solvent was removed under reduced pressure distillation, to obtain the linear polyorganosiloxane resin (R-1). The water and toluene were mixed in a weight ratio of 5:5 was put in a three-necked flask and maintained at 23 degrees C, to give mixed solvent, and a mixture of phenyltrichlorosilane, bis(trichlorosilyl)methane and vinyldimethylchlorosilane mixed in a mole ratio of 85:5:10 (300 g) was added to it in a dropwise for two hours. The resulting reaction mixture was heated and refluxed for a condensation/polymerization reaction at 90 degrees C for 3 hours. Then, the reactant was cooled down, and a water layer was removed from it, to obtain the polymer solution dissolved in toluene. The polymer solution was washed with water to remove hydrochloric acid produced in it as a byproduct. Then, the neutral polymer solution was distilled under reduced pressure to remove toluene, to obtain liquid polysiloxane (R-2) of formula ((CH3)2V1SiO1/2)0.15(P1SiO3/2)0.85), where V1 is vinyl group and P1 is phenyl group. The polyorganosiloxane resin (R-1) (3.83 g), polyorganosiloxane resin (R-1) (5 g), 3,3-diphenyl-1,1,5,5-tetramethyltrisiloxane (2.03 g), and PS-CS-1.8CS (unicore) so that the reaction solution had a platinum concentration of 3 ppm, were mixed to obtain polyorganosiloxane composition.