The present invention relates to novel Ruthenium-based complex compounds which represent viable catalysts, in particular for all sorts of metathesis reactions. Such complex compounds can be prepared by a novel, very favorable and cost efficient method which includes the introduction of an alkylidene ligand into the complex by using vinyl sulfides or vinyl ethers.

The present disclosure relates to tertiary amine co-initiators that demonstrate reduced leaching and which may be utilized in dental restoration and other biomedical applications. Embodiments of the present disclosure provide compounds and compositions for use in preparing polymers and light curable dental resin composites, as well as methods for preparing photocurable polymer-based dental restorative materials. In one or more disclosed embodiments, a co-initiator for use in preparing a polymer comprises a tertiary amine core and two or more pendant, terminal methacrylate groups. In some embodiments, the co-initiator may also act as a co-monomer in a co-polymerization reaction.

##STR00001##

A procedure for improved temperature control in controlled radical polymerization processes is disclosed. The procedure is directed at controlling the concentration of the persistent radical in ATRP and NMP polymerizations procedures and the concentration of radicals in a RAFT polymerization process by feeding a reducing agent or radical precursor continuously or intermittently to the reaction medium through one of more ports.

A procedure for improved temperature control in controlled radical polymerization processes is disclosed. The procedure is directed at controlling the concentration of the persistent radical in ATRP and NMP polymerizations procedures and the concentration of radicals in a RAFT polymerization process by feeding a reducing agent or radical precursor continuously or intermittently to the reaction medium through one of more ports.

Methods and compositions, and components comprising the compositions, are disclosed relating to improved resin-based adhesives comprising encapsulating at least a catalyst compound. Further methods and compositions are disclosed relating to encapsulated catalysts in uncured resin-based adhesives, said encapsulated catalysts configured to release the catalyst compound and cure the uncured resin-based adhesive on-demand

Methods and compositions, and components comprising the compositions, are disclosed relating to improved resin-based adhesives comprising encapsulating at least a catalyst compound. Further methods and compositions are disclosed relating to encapsulated catalysts in uncured resin-based adhesives, said encapsulated catalysts configured to release the catalyst compound and cure the uncured resin-based adhesive on-demand

An ethylene-based polymer, e.g., LDPE, with a low dissipation factor is made by a process comprising the step of contacting at polymerization conditions ethylene and, optionally, one or more comonomers, e.g., an alpha-olefin, with at least one carbon-carbon (CC) hydrocarbyl, free-radical initiator of Structure 1: wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6, are each, independently, hydrogen or a hydrocarbyl group and wherein, optionally, two or more R groups (R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6) form a ring structure, with the provisos that at least one of R.sub.2 and R.sub.5, and at least one of R.sub.3 and R.sub.6 is a hydrocarbyl group of at least two carbon atoms, e.g., an alkaryl of at least seven carbon atoms.

An ethylene-based polymer, e.g., LDPE, with a low dissipation factor is made by a process comprising the step of contacting at polymerization conditions ethylene and, optionally, one or more comonomers, e.g., an alpha-olefin, with at least one carbon-carbon (CC) hydrocarbyl, free-radical initiator of Structure 1: wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6, are each, independently, hydrogen or a hydrocarbyl group and wherein, optionally, two or more R groups (R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6) form a ring structure, with the provisos that at least one of R.sub.2 and R.sub.5, and at least one of R.sub.3 and R.sub.6 is a hydrocarbyl group of at least two carbon atoms, e.g., an alkaryl of at least seven carbon atoms.

An ethylene-based polymer, e.g., LDPE, with a low dissipation factor is made by a process comprising the step of contacting at polymerization conditions ethylene and, optionally, one or more comonomers, e.g., an alpha-olefin, with at least one carbon-carbon (CC) hydrocarbyl, free-radical initiator of Structure 1: wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6, are each, independently, hydrogen or a hydrocarbyl group and wherein, optionally, two or more R groups (R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.6) form a ring structure, with the provisos that at least one of R.sub.2 and R.sub.5, and at least one of R.sub.3 and R.sub.6 is a hydrocarbyl group of at least two carbon atoms, e.g., an alkaryl of at least seven carbon atoms.

Methods and compositions, and components comprising the compositions, are disclosed relating to improved resin-based adhesives comprising encapsulating at least a catalyst compound. Further methods and compositions are disclosed relating to encapsulated catalysts in uncured resin-based adhesives, said encapsulated catalysts configured to release the catalyst compound and cure the uncured resin-based adhesive on-demand.