Modified aluminum oxy compound, polymerization catalyst and process for producing olefin polymer and alkenyl aromatic hydrocarbon polymer

A modified aluminum oxy compound, obtained by a process that comprises reacting:

• an aluminum oxy compound(a′) having a ratio of an intensity at 30 ppm(L2) to an intensity at 10 ppm(L1)[L2/L1] in an 27Al-solid NMR spectrum of not less than 0.35, which is obtained by reacting an aluminum oxy compound(a) having a ratio of an intensity at 30 ppm(H2) to an intensity at 10 ppm(H1)[H2/H1] in an 27Al-solid NMR spectrum of less than 0.35 and water(b);
• and
• a compound(c) having a hydroxy group selected from the group consisting of tertiary alcohols and alcohols substituted with a halogen atom, the alcohols substiuted with a halogen being selected from alcohols indicated by the formula CR1R2R3—OH (wherein each of R1, R2 and R3 independently represents a hydrogen atom or hydrocarbon group having 1 to 20 carbon atoms, which is optionally substituted with a halogen atom, and they may be mutually the same or different), halogenated phenol compounds and silanol compounds, wherein the modified aluminum oxy compound has a ratio of an intensity at 30 ppm(M2) to an intensity at 10 ppm(ml)[M2/M1] in an 27Al-solid NMR spectrum of 0.60 or more, the molar ratio[(a)/(b)] of the aluminum oxy copound(a) to water(b) is 1/3 to 1/0.01, and the molar ratio[(a)/(c)]]of the aluminum oxy compound(a) to the compound(c) is 1/3 to 1/0.01.

A modified aluminum oxy compound, obtained by a process that comprises reacting:

• an aluminum oxy compound(a″) having a ratio of an intensity at 30 ppm(N2) to an intensity at 10 ppm(N1)[N2/N1] in an 27Al-solid NMR spectrum of not less than 0.35 obtained by reacting an aluminum oxy compound(a) having a ratio of an intensity at 30 ppm(H2) to an intensity at 10 ppm H1[H2/H1] in its 27Al-solid NMR spectrum of less than 0.35 and a compound(c) having a hydroxy group selected from the group consisting of tertiary alcohols and alcohols substituted with a halogen atom, the alcohol being selected from alcohols indicated by the formula CR1R2R3—OH (wherein each of R1, R2 and R3 independently represents a hydrogen atom or hydrocarbon group having 1 to 20 carbon atoms, which is optionally substituted with a halogen atom, and they may be mutually the same or different), halogenated phenol compounds and silanol compounds, with
• water(b), wherein the modified aluminum oxy compound has a ratio of an intensity at 30 ppm(M2) to an intensity at 10 ppm(M1)[M2/M1] in an 27Al-solid NMR spectrum of 0.60 or more, the molar ratio[(a)/(b)] of the aluminum oxy compound(a) to water(b) is 1/3 to 1/0.01, and the molar ratio[(a)/(c)]] of the aluminum oxy compound(a) to the compound(c) is 1/3 to 1/0.01.