A process for the preparation of polyisobutene derivatives involves bringing an oxygen-containing gas in contact with polyisobutene, in the presence of a photosensitizer, and irradiating the reaction mixture. The polyisobutene derivatives are useful, for example, in hydrocarbon mixtures or hydrocarbon-containing oils.

A process for the preparation of polyisobutene derivatives involves bringing an oxygen-containing gas in contact with polyisobutene, in the presence of a photosensitizer, and irradiating the reaction mixture. The polyisobutene derivatives are useful, for example, in hydrocarbon mixtures or hydrocarbon-containing oils.

Provided herein are polyethylene compositions having a combination of properties including: density from about 0.930 to 0.975 g/cm.sup.3; broad molecular weight distributions (Mw/Mn10 and/or Mz/Mn80) and a highly branched architecture (e.g., g.sub.LCB less than or equal to 0.85, preferably less than or equal to 0.75). The polyethylene compositions may further have a low molecular weight fraction (LMWF) and a high molecular weight fraction (HMWF), such that the wt % of LMWF in the compositions is greater than the wt % of HMWF. The polyethylene compositions may be suitable for making films, particularly oriented films such as uni axially (machine-direction-oriented) or biaxially-oriented films, and in particular all-PE films.

Provided herein are polyethylene compositions having a combination of properties including: density from about 0.930 to 0.975 g/cm.sup.3; broad molecular weight distributions (Mw/Mn10 and/or Mz/Mn80) and a highly branched architecture (e.g., g.sub.LCB less than or equal to 0.85, preferably less than or equal to 0.75). The polyethylene compositions may further have a low molecular weight fraction (LMWF) and a high molecular weight fraction (HMWF), such that the wt % of LMWF in the compositions is greater than the wt % of HMWF. The polyethylene compositions may be suitable for making films, particularly oriented films such as uni axially (machine-direction-oriented) or biaxially-oriented films, and in particular all-PE films.

Powder including low molecular weight polytetrafluoroethylene having a melt viscosity of 110.sup.2 to 710.sup.5 Pa.Math.s at 380 C., having a melt viscosity of 110.sup.2 to 710.sup.5 Pa.Math.s at 380 C., having an average particle size of 1.0 to 50 m, and containing 30 or more carboxyl groups at ends of the molecule chain per 10.sup.6 carbon atoms in the main chain, wherein the powder is substantially free from C8-C14 perfluorocarboxylic acids and salts thereof.

Powder including low molecular weight polytetrafluoroethylene having a melt viscosity of 110.sup.2 to 710.sup.5 Pa.Math.s at 380 C., having a melt viscosity of 110.sup.2 to 710.sup.5 Pa.Math.s at 380 C., having an average particle size of 1.0 to 50 m, and containing 30 or more carboxyl groups at ends of the molecule chain per 10.sup.6 carbon atoms in the main chain, wherein the powder is substantially free from C8-C14 perfluorocarboxylic acids and salts thereof.

Powder including low molecular weight polytetrafluoroethylene having a melt viscosity of 110.sup.2 to 710.sup.5 Pa.Math.s at 380 C., having a melt viscosity of 110.sup.2 to 710.sup.5 Pa.Math.s at 380 C., having an average particle size of 1.0 to 50 m, and containing 30 or more carboxyl groups at ends of the molecule chain per 10.sup.6 carbon atoms in the main chain, wherein the powder is substantially free from C8-C14 perfluorocarboxylic acids and salts thereof.

Provided are a method of preparing a dicyclopentadiene-based resin and a dicyclopentadiene-based resin. According to the present invention, provided is a dicyclopentadiene-based resin including an aromatic olefin-based comonomer as a comonomer to have improved quality including high compatibility, a favorable color characteristic, and a low softening point, and also having improved adhesive strength due to a low molecular weight and a narrow molecular weight distribution.

Provided are a method of preparing a dicyclopentadiene-based resin and a dicyclopentadiene-based resin. According to the present invention, provided is a dicyclopentadiene-based resin including an aromatic olefin-based comonomer as a comonomer to have improved quality including high compatibility, a favorable color characteristic, and a low softening point, and also having improved adhesive strength due to a low molecular weight and a narrow molecular weight distribution.

The present invention relates to a method for preparing a graft copolymer including polymerizing a conjugated diene-based monomer to prepare a small-size conjugated diene-based polymer; enlarging the small-size conjugated diene-based polymer to prepare a large-size conjugated diene-based polymer; and polymerizing the small-size conjugated diene-based polymer, the large-size conjugated diene-based polymer, an aromatic vinyl-based monomer and a vinyl cyan-based monomer to prepare a graft copolymer, wherein a weight ratio of the small-size conjugated diene-based polymer and the large-size conjugated diene-based polymer is 10:90 to 40:60 in preparing the graft copolymer.