According to an embodiment of the present invention, provided is a process for polymerizing molecular weight—adjustable polymer, comprising: a reactant supply step of supplying a gaseous monomer, a surfactant, and an initiator; a polymerization reaction step of performing a polymerization reaction in which the monomer, the surfactant, and the initiator participate; and a product discharging step of discharging the polymer compound produced by the polymerization reaction, wherein the flow rate of the supplied initiator is inversely proportional to the molecular weight of the polymer compound, and the molecular weight of the polymer compound produced by the polymerization reaction is adjusted by controlling the flow rate of the initiator.

According to an embodiment of the present invention, provided is a process for polymerizing molecular weight—adjustable polymer, comprising: a reactant supply step of supplying a gaseous monomer, a surfactant, and an initiator; a polymerization reaction step of performing a polymerization reaction in which the monomer, the surfactant, and the initiator participate; and a product discharging step of discharging the polymer compound produced by the polymerization reaction, wherein the flow rate of the supplied initiator is inversely proportional to the molecular weight of the polymer compound, and the molecular weight of the polymer compound produced by the polymerization reaction is adjusted by controlling the flow rate of the initiator.

The present invention relates to aqueous acrylic polymer latexes, which are suitable as binders in coating compositions for providing flexible roofing. The present invention also relates to coating compositions containing such binders, which are suitable for providing flexible roofing. The aqueous acrylic polymer latexes have a glass transition temperature T.sub.g of at most from −10° C., in particular at most −20° C., or, in case of a multi-stage polymer latex a weight average glass transition temperature T.sub.g of at most from −10° C., where the polymer of the acrylic polymer latex has a carbon polymer backbone formed by polymerized ethylenically unsaturated monomers M comprising acrylic monomers, and where the carbon polymer backbone bears functional groups of the formula (I) attached to carbon atoms of the polymer backbone *—C(═O)—O-[A-NH].sub.nH (I) where the asterisk indicates the atom attached to a carbon atom of the polymer backbone, n is an integer, the number average of n in all functional groups of the formula (I) being >1, in particular at least 1.1 or at least 1.2 or at least 1.3, and A is selected from the group consisting of 1,2-ethandiyl or 1,2-propandiyl, where the functional groups of the formula (I) contribute to the total weight of the polymer in the acrylic polymer latex by 0.1 to 10% by weight.

A heterophasic propylene polymerization material, including a propylene polymer component (I) and an ethylene-α-olefin copolymer component (II), the heterophasic propylene polymerization material satisfying features (i) to (v): (i) the heterophasic propylene polymerization material contains a xylene-soluble content by 20 wt % or more; (ii) xylene-soluble content in the heterophasic propylene polymerization material has a limiting viscosity [η].sub.CXS not less than 5 dL/g; (iii) a melt flow rate of the propylene polymer component (I) is 70 g/10 min or more; (iv) MFR of the heterophasic propylene polymerization material is not less than 5 g/10 min; and (v) the number of gels of 100 μm or more in diameter on a sheet for counting gels, including the heterophasic propylene polymerization material, is 1000 or less per 100 cm.sup.2 of the sheet.

A heterophasic propylene polymerization material, including a propylene polymer component (I) and an ethylene-α-olefin copolymer component (II), the heterophasic propylene polymerization material satisfying features (i) to (v): (i) the heterophasic propylene polymerization material contains a xylene-soluble content by 20 wt % or more; (ii) xylene-soluble content in the heterophasic propylene polymerization material has a limiting viscosity [η].sub.CXS not less than 5 dL/g; (iii) a melt flow rate of the propylene polymer component (I) is 70 g/10 min or more; (iv) MFR of the heterophasic propylene polymerization material is not less than 5 g/10 min; and (v) the number of gels of 100 μm or more in diameter on a sheet for counting gels, including the heterophasic propylene polymerization material, is 1000 or less per 100 cm.sup.2 of the sheet.

A process for preliminary polymerization may include washing a catalyst mud comprising a supported metallocene catalyst with at least one saturated hydrocarbon at a temperature from 0° C. to 40° C., a pressure from 20 to 40 kgf/cm.sup.2, and a residence time of at least 30 minutes; continuously feeding the washed catalytic mud to a continuous pre-polymerization reactor; and pre-polymerizing, in the continuous pre-polymerization reactor, ethylene and at least one C.sub.4 to C.sub.10 α-olefin as comonomer, with the washed catalytic mud, to produce a pre-polymer; wherein an average residence time in the continuous pre-polymerization reactor is more than 90 minutes and less than 240 minutes, a reactor temperature is from 10° C. to 50° C., and a reactor pressure from 20 to 40 kgf/cm.sup.2.

A process for preliminary polymerization may include washing a catalyst mud comprising a supported metallocene catalyst with at least one saturated hydrocarbon at a temperature from 0° C. to 40° C., a pressure from 20 to 40 kgf/cm.sup.2, and a residence time of at least 30 minutes; continuously feeding the washed catalytic mud to a continuous pre-polymerization reactor; and pre-polymerizing, in the continuous pre-polymerization reactor, ethylene and at least one C.sub.4 to C.sub.10 α-olefin as comonomer, with the washed catalytic mud, to produce a pre-polymer; wherein an average residence time in the continuous pre-polymerization reactor is more than 90 minutes and less than 240 minutes, a reactor temperature is from 10° C. to 50° C., and a reactor pressure from 20 to 40 kgf/cm.sup.2.

A polyethylene composition for producing blow-molded hollow articles, having the following features: 1) density from 0.940 to 0.955 g/cm.sup.3, determined according to ISO 1183 at 23° C.; 2) ratio MIF/MIP from 12 to 40; 3) Mz from 500,000 to 3,500,000 g/mol; 4) η.sub.0.02 from 80,000 to 300,000 Pa.Math.s; 5) HMWcopo index from 1 to 15; and 6) Mz/Mw*LCBI lower than 6.4.

A polyethylene composition for producing blow-molded hollow articles, having the following features: 1) density from 0.940 to 0.955 g/cm.sup.3, determined according to ISO 1183 at 23° C.; 2) ratio MIF/MIP from 12 to 40; 3) Mz from 500,000 to 3,500,000 g/mol; 4) η.sub.0.02 from 80,000 to 300,000 Pa.Math.s; 5) HMWcopo index from 1 to 15; and 6) Mz/Mw*LCBI lower than 6.4.

The present invention relates to a fluorosurfactant-free emulsion polymerization method for the synthesis of a fluoropolymer, more in particular of a VDF-based polymer.