Methods for reinforcing chromium catalysts by the deposition of additional silica are disclosed herein. The resultant silica-reinforced chromium supported catalysts can be used to polymerize olefins to produce, for example, ethylene based homopolymers and copolymers with higher molecular weights and additional long chain branching.

Supported chromium catalysts with an average valence less than +6 and having a hydrocarbon-containing or halogenated hydrocarbon-containing ligand attached to at least one bonding site on the chromium are disclosed, as well as ethylene-based polymers with terminal alkane, aromatic, or halogenated hydrocarbon chain ends. Another ethylene polymer characterized by at least 2 wt. % of the polymer having a molecular weight greater than 1,000,000 g/mol and at least 1.5 wt. % of the polymer having a molecular weight less than 1000 g/mol is provided, as well as an ethylene homopolymer with at least 3.5 methyl short chain branches and less than 0.6 butyl short chain branches per 1000 total carbon atoms.

A method comprising a) drying a support material comprising silica at temperature in the range of from about 150? C. to about 220? C. to form a dried support; b) contacting the dried support with methanol to form a slurried support; c) subsequent to b), cooling the slurried support to a temperature of less than about 60? C. to form a cooled slurried support; d) subsequent to c), contacting the cooled slurried support with a titanium alkoxide to form a titanated support; and e) thermally treating the titanated support by heating to a temperature of equal to or greater than about 150? C. for a time period of from about 5 hours to about 30 hours to remove the methanol and yield a dried titanated support.

A method comprising a) drying a support material comprising silica at temperature in the range of from about 150? C. to about 220? C. to form a dried support; b) contacting the dried support with methanol to form a slurried support; c) subsequent to b), cooling the slurried support to a temperature of less than about 60? C. to form a cooled slurried support; d) subsequent to c), contacting the cooled slurried support with a titanium alkoxide to form a titanated support; and e) thermally treating the titanated support by heating to a temperature of equal to or greater than about 150? C. for a time period of from about 5 hours to about 30 hours to remove the methanol and yield a dried titanated support.

Methods for reinforcing chromium catalysts by the deposition of additional silica are disclosed herein. The resultant silica-reinforced chromium supported catalysts can be used to polymerize olefins to produce, for example, ethylene based homopolymers and copolymers with higher molecular weights and additional long chain branching.

Methods for reinforcing chromium catalysts by the deposition of additional silica are disclosed herein. The resultant silica-reinforced chromium supported catalysts can be used to polymerize olefins to produce, for example, ethylene based homopolymers and copolymers with higher molecular weights and additional long chain branching.

Disclosed are saturated cyclic monopolymers derived from hexyne, octyne, nonyne, pentadecyne and saturated cyclic copolymers derived from acetylene and a second alkyne monomer that is hexyne, octyne, nonyne, or pentadecyne.

A method comprising contacting a silica support with a titanium-containing solution to form a titanated silica support, wherein the titanium-containing solution comprises a solvent; a ligand comprising a glycol, a carboxylate, a peroxide, or a combination thereof, and a titanium compound having the formula Ti(acac).sub.2(OR).sub.2, wherein acac is acetylacetonate and wherein each R independently is ethyl, isopropyl, n-propyl, isobutyl, or n-butyl.

A method comprising contacting a silica support with a titanium-containing solution to form a titanated silica support, wherein the titanium-containing solution comprises a solvent; a ligand comprising a glycol, a carboxylate, a peroxide, or a combination thereof, and a titanium compound having the formula Ti(acac).sub.2(OR).sub.2, wherein acac is acetylacetonate and wherein each R independently is ethyl, isopropyl, n-propyl, isobutyl, or n-butyl.

A method comprising a) drying a support material comprising silica at temperature in the range of from about 150? C. to about 220? C. to form a dried support; b) contacting the dried support with methanol to form a slurried support; c) subsequent to b), cooling the slurried support to a temperature of less than about 60? C. to form a cooled slurried support; d) subsequent to c), contacting the cooled slurried support with a titanium alkoxide to form a titanated support; and e) thermally treating the titanated support by heating to a temperature of equal to or greater than about 150? C. for a time period of from about 5 hours to about 30 hours to remove the methanol and yield a dried titanated support.