The present disclosure relates to a polypropylene resin exhibiting excellent processability and capable of producing fine fibers, a polypropylene fiber including the same, and a method for preparing the same.

The present disclosure relates to a method of preparing a graft polymer, which includes: performing primary continuous polymerization by adding a diene-based rubber polymer and an aromatic vinyl-based monomer to a first reactor; and performing secondary continuous polymerization by adding the polymerization product discharged from the first reactor, a maleimide-based monomer, and a vinyl cyanide-based monomer to a second reactor.

A combination comprising a receptacle of defined internal volume, which contains a chemical reaction product. The product may be made in apparatus for undertaking a chemical reaction which comprises an elongate housing and a receptacle. The elongate housing may include a cooling means and end fittings which may include ports where fluids may be introduced and/or removed.

A combination comprising a receptacle of defined internal volume, which contains a chemical reaction product. The product may be made in apparatus for undertaking a chemical reaction which comprises an elongate housing and a receptacle. The elongate housing may include a cooling means and end fittings which may include ports where fluids may be introduced and/or removed.

The present invention relates to a water-soluble polymer obtained by polymerization of at least a 2-dimethylaminoethyl acrylate monomer and/or its salts, in presence of at least a tocopherol and/or its derivatives, or a tocotrienol and/or its derivatives, and its uses.

The present invention provides a polypropylene resin pellet that is environment friendly, has excellent workability, and enables preparation of fine denier fiber, and a method for preparing the same.

The present invention provides a polypropylene resin pellet that is environment friendly, has excellent workability, and enables preparation of fine denier fiber, and a method for preparing the same.

Controlling the shutdown of a polyethylene reactor system that includes a secondary compressor, a reactor, a high pressure let down valve (HPLDV), a high-pressure separator, and a high-pressure recycle gas system is provided. After a partial or complete shutdown of secondary compressor, HPLDV opens to a pre-set open position until the reactor pressure reduces to either a pre-set reduced pressure limit or a until the slope of the reactor gas density to reactor pressure exceeds 0.15. The HPLDV controls the pressure to a pressure set point.

Controlling the shutdown of a polyethylene reactor system that includes a secondary compressor, a reactor, a high pressure let down valve (HPLDV), a high-pressure separator, and a high-pressure recycle gas system is provided. After a partial or complete shutdown of secondary compressor, HPLDV opens to a pre-set open position until the reactor pressure reduces to either a pre-set reduced pressure limit or a until the slope of the reactor gas density to reactor pressure exceeds 0.15. The HPLDV controls the pressure to a pressure set point.

The present disclosure provides a method of preparing a vinyl chloride-based polymer having improved processability due to excellent blendability, and the vinyl chloride-based polymer having a particle non-uniformity of 10 or more defined by Equation 1. $\begin{array}{cc}\mathrm{Particle}\mathrm{non}\text{-}\mathrm{uniformity}\left[E\left(X\right)\right]=\frac{1}{50}\underset{i=1}{\overset{50}{.Math.}}{X}_i& \left[\mathrm{Equation}1\right]\end{array}$