Low molecular weight, high Tg resins, with applications including tire additives and adhesives. An oligomer is obtained by ring opening metathesis polymerization (ROMP) of a sterically encumbered cyclic monomer with an olefinic chain transfer agent. The sterically encumbered cyclic monomer and the olefinic chain transfer agent are present in the polymerization at a molar ratio of from 2:1 to about 40:1. Also, methods for making the oligomer by ROMP.

The copolymerization of ethylene with a cyclic mono olefin (such as norbornene) is conducted in the presence of a catalyst system comprising a bridged hafnocene catalyst and a three part activator. The catalyst system provides excellent activity at high polymerization temperatures. Copolymers produced according to this invention have unique microstructure (with methyl branching being observed) and unique rheology.

The copolymerization of ethylene with a cyclic mono olefin (such as norbornene) is conducted in the presence of a catalyst system comprising a bridged hafnocene catalyst and a three part activator. The catalyst system provides excellent activity at high polymerization temperatures. Copolymers produced according to this invention have unique microstructure (with methyl branching being observed) and unique rheology.

Disclosed are polymers derived from biomass. More specifically described are -pinene-based polymers, copolymers and compositions comprising -pinene-based polymers. Also disclosed are methods of making the same.

Disclosed are polymers derived from biomass. More specifically described are -pinene-based polymers, copolymers and compositions comprising -pinene-based polymers. Also disclosed are methods of making the same.

The present invention relates to an ethylene polymer comprising moieties according to Formula (IB): wherein R is a moiety comprising 1 and 10 carbon atoms; wherein R.sup.1 and R.sup.2 are each individually hydrogen or a moiety comprising 1 and 5 carbon atoms, R.sup.1 and R.sup.2 may be the same or different; wherein the ethylene polymer has a molecular weight distribution of 3.0 and 40.0; the ethylene polymer has a melting temperature of 115 C.; the ethylene polymer has a density 935 and 960 kg/m3; the ethylene polymer is essentially free from chromium, hafnium, zirconium and tetrahydrofuran; for the fraction of the ethylene polymer having a molecular weight >100 kg/mol, the intrinsic viscosity of the ethylene polymer is related to the molecular weight according to the inequality: log I.V.<0.65*log M3.10 Such polymers have high density, high purity and good processability, whilst maintaining barrier properties for oxygen and water vapour at a level similar to high-density polyethylenes produced via catalytic processes. ##STR00001##

The present invention relates to an ethylene polymer comprising moieties according to Formula (IB): wherein R is a moiety comprising 1 and 10 carbon atoms; wherein R.sup.1 and R.sup.2 are each individually hydrogen or a moiety comprising 1 and 5 carbon atoms, R.sup.1 and R.sup.2 may be the same or different; wherein the ethylene polymer has a molecular weight distribution of 3.0 and 40.0; the ethylene polymer has a melting temperature of 115 C.; the ethylene polymer has a density 935 and 960 kg/m3; the ethylene polymer is essentially free from chromium, hafnium, zirconium and tetrahydrofuran; for the fraction of the ethylene polymer having a molecular weight >100 kg/mol, the intrinsic viscosity of the ethylene polymer is related to the molecular weight according to the inequality: log I.V.<0.65*log M3.10 Such polymers have high density, high purity and good processability, whilst maintaining barrier properties for oxygen and water vapour at a level similar to high-density polyethylenes produced via catalytic processes. ##STR00001##

The present invention relates to an ethylene polymer comprising moieties according to Formula (IB): wherein R is a moiety comprising 1 and 10 carbon atoms; wherein R.sup.1 and R.sup.2 are each individually hydrogen or a moiety comprising 1 and 5 carbon atoms, R.sup.1 and R.sup.2 may be the same or different; wherein the ethylene polymer has a molecular weight distribution of 3.0 and 40.0; the ethylene polymer has a melting temperature of 115 C.; the ethylene polymer has a density 935 and 960 kg/m3; the ethylene polymer is essentially free from chromium, hafnium, zirconium and tetrahydrofuran; for the fraction of the ethylene polymer having a molecular weight >100 kg/mol, the intrinsic viscosity of the ethylene polymer is related to the molecular weight according to the inequality: log I.V.<0.65*log M3.10 Such polymers have high density, high purity and good processability, whilst maintaining barrier properties for oxygen and water vapour at a level similar to high-density polyethylenes produced via catalytic processes. ##STR00001##

This invention relates to the field of polymers and olefin polymerization, and more specifically olefin metathesis polymerization. Specifically, the present invention provides a polymer comprising rigorously alternating AB subunits and methods of formation of the AB alternating polymers. In the polymers and process of the invention, the A monomer is derived from a cyclobutene derivative, and the B monomer is derived from a cyclohexene derivative. The polymerization takes place in the presence of an olefin metathesis catalyst.

This invention relates to the field of polymers and olefin polymerization, and more specifically olefin metathesis polymerization. Specifically, the present invention provides a polymer comprising rigorously alternating AB subunits and methods of formation of the AB alternating polymers. In the polymers and process of the invention, the A monomer is derived from a cyclobutene derivative, and the B monomer is derived from a cyclohexene derivative. The polymerization takes place in the presence of an olefin metathesis catalyst.