A curable composition comprising at least one organopolysiloxane represented by the composition formula: (R 1 3 SiO 1/2) a (R 1 2 SiO 2/2) b (R 1 R 2 SiO 2/2) c (R 1 SiO 3/2) d (R 2 SiO 3/2) e (R 1 2 R 2 SiO 1/2) f, wherein each R 1 independently represents a monovalent organic group having 1 to 20 carbon atoms or an OH group with the proviso that at each silicon-atom bearing no R 2 at least one R 1 represents a monovalent organic group having 1 to 20 carbon atoms, each R 2 independently represents a methacryloxyalkyl group having 5 to 20 carbon atoms and a, b, c, d, e, f each represent the fraction of the number of the respective units based on the number of all units of the organopolysiloxane and satisfy a ≥ 0, b ≥ 0, c ≥ 0, d ≥ 0, e ≥ 0, f ≥ 0 and also satisfy c+e > 0 and a+b+c+d+e+f = 1; and at least one curing catalyst, wherein the organopolysiloxane is of linear structure represented by the composition formula: (R 1' 3 SiO 1/2) a (R 1' 2 SiO 2/2) b (R 1' R 2 SiO 2/2) c, wherein each R 1' independently represents an unsubstituted or substituted monovalent hydrocarbon group having 1 to 20 carbon atoms, each R 2 independently represents a methacryloxyalkyl group having 5 to 20 carbon atoms and a, b, c each represent the fraction of the number of the respective units based on the number of all units of the organopolysiloxane and satisfy a > 0, b > 0, c > 0 and a+b+c = 1, and wherein the composition further comprises at least one organopolysiloxane which is of branched structure represented by the composition formula: (R 1' 3 SiO 1/2) a (R 1' 2 SiO 2/2) b (R 1' R 2 SiO 2/2) c (R 1' SiO 3/2) d (R 2 SiO 3/2) e, wherein each R 1' independently represents an unsubstituted or substituted monovalent hydrocarbon group having 1 to 20 carbon atoms, each R 2 independently represents a methacryloxyalkyl group having 5 to 20 carbon atoms and a, b, c, d, e each represent the fraction of the number of the respective units based on the number of all units of the organopolysiloxane and satisfy a > 0, b ≥ 0, c ≥ 0, d ≥ 0, e > 0 and a+b+c+d+e = 1, the weight ratio of organopolysiloxanes represented by composition formula to organopolysiloxanes represented by composition formula is from 1:5 to 3:1. at least one organopolysiloxane represented by the composition formula: (R 1 3 SiO 1/2) a (R 1 2 SiO 2/2) b (R 1 R 2 SiO 2/2) c (R 1 SiO 3/2) d (R 2 SiO 3/2) e (R 1 2 R 2 SiO 1/2) f, wherein each R 1 independently represents a monovalent organic group having 1 to 20 carbon atoms or an OH group with the proviso that at each silicon-atom bearing no R 2 at least one R 1 represents a monovalent organic group having 1 to 20 carbon atoms, each R 2 independently represents a methacryloxyalkyl group having 5 to 20 carbon atoms and a, b, c, d, e, f each represent the fraction of the number of the respective units based on the number of all units of the organopolysiloxane and satisfy a ≥ 0, b ≥ 0, c ≥ 0, d ≥ 0, e ≥ 0, f ≥ 0 and also satisfy c+e > 0 and a+b+c+d+e+f = 1; and at least one curing catalyst, wherein the organopolysiloxane is of linear structure represented by the composition formula: (R 1' 3 SiO 1/2) a (R 1' 2 SiO 2/2) b (R 1' R 2 SiO 2/2) c, wherein each R 1' independently represents an unsubstituted or substituted monovalent hydrocarbon group having 1 to 20 carbon atoms, each R 2 independently represents a methacryloxyalkyl group having 5 to 20 carbon atoms and a, b, c each represent the fraction of the number of the respective units based on the number of all units of the organopolysiloxane and satisfy a > 0, b > 0, c > 0 and a+b+c = 1, and wherein the composition further comprises at least one organopolysiloxane which is of branched structure represented by the composition formula: (R 1' 3 SiO 1/2) a (R 1' 2 SiO 2/2) b (R 1' R 2 SiO 2/2) c (R 1' SiO 3/2) d (R 2 SiO 3/2) e, wherein each R 1' independently represents an unsubstituted or substituted monovalent hydrocarbon group having 1 to 20 carbon atoms, each R 2 independently represents a methacryloxyalkyl group having 5 to 20 carbon atoms and a, b, c, d, e each represent the fraction of the number of the respective units based on the number of all units of the organopolysiloxane and satisfy a > 0, b ≥ 0, c ≥ 0, d ≥ 0, e > 0 and a+b+c+d+e = 1, the weight ratio of organopolysiloxanes represented by composition formula to organopolysiloxanes represented by composition formula is from 1:5 to 3:1.