A polysiloxane composition comprising the following ingredients: (a) a hydroxyl-terminated polyorganosiloxane; (b) a multifunctional alkoxysilane; and (c) an organotitanium compound having the following general formula I or II, or a multipolymer thereof having a degree of polymerization of from 2 to 10, (i) an organotitanium compound I with the following general formula I, where n is an arbitrary integer between 1 and 4, R 1 is a saturated monovalent hydrocarbon group having from 1 to 16 carbon atoms, R 2 is a saturated divalent hydrocarbon group having from 1 to 16 carbon atoms, R 3 is a saturated monovalent hydrocarbon group having from 1 to 32 carbon atoms, wherein the hydrocarbon groups include both linear and branched ones; (ii) an organotitanium compound II with the following general formula II, where m is an arbitrary integer between 2 and 4, R 4 is a saturated monovalent hydrocarbon group having from 1 to 16 carbon atoms, R 5 is a saturated divalent hydrocarbon group having from 1 to 16 carbon atoms, R 6 is a saturated monovalent hydrocarbon group having from 4 to 32 carbon atoms, wherein the hydrocarbon groups include both linear and branched ones; optionally, further comprising a catalyst (d). (a) a hydroxyl-terminated polyorganosiloxane; (b) a multifunctional alkoxysilane; and (c) an organotitanium compound having the following general formula I or II, or a multipolymer thereof having a degree of polymerization of from 2 to 10, (i) an organotitanium compound I with the following general formula I, where n is an arbitrary integer between 1 and 4, R 1 is a saturated monovalent hydrocarbon group having from 1 to 16 carbon atoms, R 2 is a saturated divalent hydrocarbon group having from 1 to 16 carbon atoms, R 3 is a saturated monovalent hydrocarbon group having from 1 to 32 carbon atoms, wherein the hydrocarbon groups include both linear and branched ones; (ii) an organotitanium compound II with the following general formula II, where m is an arbitrary integer between 2 and 4, R 4 is a saturated monovalent hydrocarbon group having from 1 to 16 carbon atoms, R 5 is a saturated divalent hydrocarbon group having from 1 to 16 carbon atoms, R 6 is a saturated monovalent hydrocarbon group having from 4 to 32 carbon atoms, wherein the hydrocarbon groups include both linear and branched ones; (i) an organotitanium compound I with the following general formula I, where n is an arbitrary integer between 1 and 4, R 1 is a saturated monovalent hydrocarbon group having from 1 to 16 carbon atoms, R 2 is a saturated divalent hydrocarbon group having from 1 to 16 carbon atoms, R 3 is a saturated monovalent hydrocarbon group having from 1 to 32 carbon atoms, wherein the hydrocarbon groups include both linear and branched ones; where n is an arbitrary integer between 1 and 4, R 1 is a saturated monovalent hydrocarbon group having from 1 to 16 carbon atoms, R 2 is a saturated divalent hydrocarbon group having from 1 to 16 carbon atoms, R 3 is a saturated monovalent hydrocarbon group having from 1 to 32 carbon atoms, wherein the hydrocarbon groups include both linear and branched ones; (ii) an organotitanium compound II with the following general formula II, where m is an arbitrary integer between 2 and 4, R 4 is a saturated monovalent hydrocarbon group having from 1 to 16 carbon atoms, R 5 is a saturated divalent hydrocarbon group having from 1 to 16 carbon atoms, R 6 is a saturated monovalent hydrocarbon group having from 4 to 32 carbon atoms, wherein the hydrocarbon groups include both linear and branched ones; where m is an arbitrary integer between 2 and 4, R 4 is a saturated monovalent hydrocarbon group having from 1 to 16 carbon atoms, R 5 is a saturated divalent hydrocarbon group having from 1 to 16 carbon atoms, R 6 is a saturated monovalent hydrocarbon group having from 4 to 32 carbon atoms, wherein the hydrocarbon groups include both linear and branched ones;