The present disclosure is directed towards a solution or bulk polymerization process for preparing high-cis polydienes that utilizes at least one vinyl aromatic compound as a molecular weight regulator. The disclosed solution or bulk polymerization processes are useful for preparing high-cis polydienes with a Mooney viscosity between 30 and 55 while allowing the use of lower amounts of catalyst.

The present disclosure is directed towards a solution or bulk polymerization process for preparing high-cis polydienes that utilizes at least one vinyl aromatic compound as a molecular weight regulator. The disclosed solution or bulk polymerization processes are useful for preparing high-cis polydienes with a Mooney viscosity between 30 and 55 while allowing the use of lower amounts of catalyst.

The present disclosure provides a compound, a complex, a preparation method thereof, and a use thereof. The compound is represented by the following structural formula, in which R.sup.1 to R.sup.10 are the same or different and are each independently selected from hydrogen, a hydrocarbon group having a carbon number of C.sub.1 to C.sub.16, a substituted hydrocarbon group, an alkoxy group, an alkylthio group, an alkylamino group, a haloalkylthio group, a halogen-substituted alkoxy group, a halogen-substituted alkylamino group, an aryloxy group, an arylthio group, arylamino group, a diphenylphosphino group, a halogen group, a nitro group, or a nitrile group. The complex of one embodiment of the present disclosure has a high catalytic effect, and can be used to prepare a highly branched, controllable, low molecular weight polymer with a high activity.

##STR00001##

A catalyst configured to be handled more easily than conventional catalysts and configured to copolymerize an α-olefin and a (meth)acrylic acid ester with high activity. The objects are achieved by polymerization using an olefin polymerization catalyst which contains a metal complex obtained by reacting a ligand having a specific structure and a transition metal compound containing a transition metal selected from nickel or palladium having a specific structure.

Disclosed are catalyst systems, processes for making the catalyst systems, and processes for polymerizing at least one olefin monomer comprising ethylene to form a low-density polyethylene (LDPE). The polymerization process uses a catalyst system that can include: at least one diimine complex having the formula I: ##STR00001##
wherein M is Ni, Pd, or Pt; a first activator such as an organoaluminum compound; and a second activator including a solid oxide chemically-treated with an electron withdrawing anion, such as fluoride silica-alumuina. It was discovered that such the complexes could be activated in a manner to provide an active catalyst system that polymerized ethylene to form a low-density polyethylene (LDPE).

A block copolymer is disclosed. The block copolymer has a structure of formula (V) below:

[D].sub.x-[E].sub.y-[F].sub.z  (V) wherein D, E, and F are each independently a compound of formula (VI) below, and D, E, and F are different from each other; and x, y, and z are each independently an integer from 1 to 40;

##STR00001## wherein A.sub.2 is O or S; R.sub.7 is H or a C.sub.1-6 alkyl; and R.sub.8 is a C.sub.1-12 alkyl, (CH.sub.2).sub.qN(R.sub.11).sub.2, CH.sub.2(CH.sub.2OCH.sub.2).sub.rCH.sub.2N(R.sub.12).sub.2, or CH.sub.2(CH.sub.2OCH.sub.2).sub.sCH.sub.2OR.sub.13, wherein R.sub.11, R.sub.12, and R.sub.13 are each independently a C.sub.1-6 alkyl; and q, r, and s are each independently an integer from 1 to 10.

A preparation method for a copolymer includes the step(s) of contacting an olefin and an unsaturated carboxylic acid shown in Formula II or a derivative of the unsaturated carboxylic acid shown in Formula II with a catalyst and optionally a chain transfer agent for reaction in the presence of an alkane solvent to obtain the copolymer. The copolymer is a spherical and/or spherical-like copolymer.

A preparation method for a copolymer includes the step(s) of contacting an olefin and an unsaturated carboxylic acid shown in Formula II or a derivative of the unsaturated carboxylic acid shown in Formula II with a catalyst and optionally a chain transfer agent for reaction in the presence of an alkane solvent to obtain the copolymer. The copolymer is a spherical and/or spherical-like copolymer.

An oligomerization catalyst, oligomer products, methods for making and using same. The catalyst can include a supported nickel phosphate compound. The catalyst is stable at oligomerization temperatures of 500° C. or higher and particularly useful for making oligomer products containing C4 to C26 olefins having a boiling point in the range of 170° C. to 360° C.

The present disclosure provides base stocks and or diesel fuel, and processes for producing such base stocks and or diesel fuel by polymerizing alpha-olefins and internal olefins. The present disclosure further provides polyolefin products useful as base stocks and or diesel fuel. In at least one embodiment, a process includes: i) introducing, neat or in the presence of a solvent, a feed comprising a branched C.sub.5-C.sub.30 internal olefin, with a catalyst compound comprising a group 8, 9, 10, or 11 transition metal and at least one heteroatom; and ii) obtaining a C.sub.6-C.sub.100 polyolefin product having one olefin, a methylene content of from about 1 wt. % to about 98 wt. %, and or a methyl content of from about 1 wt. % to about 75 wt. %. The feed may further include a linear C.sub.4-C.sub.30 internal olefin, a C.sub.2-C.sub.30 alpha-olefin, or a mixture thereof.