A method of making a low-fluoride reactive PIB composition includes in one embodiment: a) providing an isobutylene-enriched C4 feedstock by way of blending a first mixed C4 feedstock with a second feedstock having a lower LB/IsoB index; (b) feeding the isobutylene-enriched C4 feedstock to a polymerization reactor with a catalyst complex comprising BF.sub.3 and a modifier selected from alcohols, ethers and mixtures thereof; (c) polymerizing the isobutylene-enriched C4 feedstock in the reactor while maintaining the reactor at a temperature above 40 C. and most preferably above 15 C. and utilizing a residence time less than 45 minutes to produce a crude PIB composition in a polymerization mixture; and (d) recovering a purified PIB composition from the polymerization mixture having a molecular weight, Mn, from 250 to 5000 Daltons and an alpha vinylidene content of at least 50 mol %. The crude PIB composition suitably has a fluoride content of less than 100 ppm and the purified PIB composition has a fluoride content of less than 20 ppm. In another aspect, ammonium salts are used to neutralize the catalyst and fluoride salts are sublimed from the product at elevated temperatures.

The present invention is directed to a process for the production of high density polyethylene by polymerisation of ethylene in the presence of a supported chromium oxide based catalyst which is modified with an organic compound comprising oxygen and a nitrogen atom which is selected from the group consisting of saturated heterocyclic organic compounds with a five or six membered ring, amino esters and amino alcohols. Such organic compounds allow manufacturing of HDPE with increases molecular weight distribution and increased molecular weight.

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.

Polypropylene having a melt flow rate MFR.sub.2 (230 C.) of at least 20 g/10 min; and a M.sub.w/M.sub.n ratio of at least 15.0.

Provided is a fluorine-containing macroinitiator, particularly a fluorine-containing macroinitiator that enables production of a fluorine-containing block copolymer containing a non-fluorine vinyl-based monomer having a long side chain. The fluorine-containing macroinitiator includes a polymer represented by the following formula (1) and having a number-average molecular weight of 3,000 to 100,000. In the following formula (1), R.sup.2, R.sup.3 and R.sup.4 are each a specific group, and Q is a polymer segment composed of a structural unit represented by the following formula (2). In the following formula (2), R.sup.1 is a hydrogen atom or a methyl group, Rf is a fluoroalkyl group having a specific structure, and k is an appropriate integer that is not 0. ##STR00001##

The present disclosure describes, in part, an enzyme-mediated radical initiating system and methods of using the system to produce polymers, including polymeric hydrogels, at ambient conditions.

The present technology relates to a method of introducing a supported antistatic compound that does not comprise a transition-metal-based catalyst component for use in an olefin polymerization reactor. In some embodiments, the methods disclosed herein avoid the formation of polymer agglomerates in the reactor and minimize potentially negative effects on catalyst yield.

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.