Abstract: Olefin polymerization comprising catalysts based on a metallocene, an alumoxane and a support are disclosed. The process for the preparation of a supported olefin ploymerization catalyst comprises: a) a metallocene/activator reaction product, a solvent capable of dissolving it, and a porous support are brought into mutual contact, and b) the solvent is removed, and wherein step a) is carried out so that the porous support is impregnated with a volume of the metallocene/activator reaction product and solvent, which does not exceed the total pore volume of the support.

Abstract: A crosslinkable polymer composition contains a crosslinkable polymer with hydrolysable silane groups and at least one silanol condensation catalyst. The polymer composition is distinguished by the silanol condensation catalyst being a compound of the formula ArSO.sub.3 H (I) or a precursor thereof, Ar being a substituted benzene or naphthalene ring, the substituent or substituents containing 4-20 carbon atoms, preferably 10-18 carbon atoms. The precursor may be an anhydride of the sulphonic acid of formula (I), or a sulphonic acid of formula (I) provided with a hydrolysable protective group, eg. an acetyl group. Specific examples of compounds of formula (I) are dodecyl benzene sulphonic acid and tetrapropyl benzene sulphonic acid.

Abstract: An improved process for the production of polyolefins in an autoclave reactor having several reaction zones operated at a pressure of 100 to 300 MPa and a temperature of 100 to 300.degree. C. is disclosed. Dunng operation, temperatures are measured continuously inside the autoclave reactor at specific points distributed along the reactor length, each of said measured temperatures is compared with a corresponding preset temperature and the detected deviation between each pair of preset and measured temperatures is used in regulating the amount of monomer and initiator fed into the autoclave through several feed inlets distributed along the reactor length, in order to minimize the temperature deviations and thus obtain an improved control of the polymerization process.

Abstract: The active carrier particles of even size of the polymerization catalyst are prepared so that a melt of a complex composition is provided having the formula (I)MgCl.sub.2 nROH mED (I)in which ROH depicts an aliphatic alcohol, R is a C.sub.1 -C.sub.6 alkyl, ED depicts an electron donor, n is 1 to 6 and m is 0 to 1; the melt provided is fed to a nozzle (4); the melt is sprayed from the nozzle (4) to the spraying area (5), in which it is divided into fine melt droplets and possibly partly solidifies; the possibly partly solidified melt particles are transferred to a cooled crystallization area (6), where they crystallize to solid carrier particles; and the solid carrier particles are recovered. The melt mentioned is sprayed through a nozzle (4), which is rotated or which has attached to it a member that rotates and throws melt outwards from the rotating center to the spraying area (5).

Abstract: A cross-linkable polymer composition contains a cross-linkable polymer with hydrolysable silane groups and at least one silanol condensation catalyst. The polymer composition is distinguished by the silanol condensation catalyst being a tinorganic compound of formula (I); RSn(OH).sub.k X.sub.1 OSn(OH).sub.m X.sub.n R', wherein R and R' are hydrocarbon radicals, R' being the same as or different from R, X is a halogen, h is 1 or 2, j is 1 or 2, h+j=3, k, l, m and n are 1 or 2, k+1=2, m+n=2 and at least one of 1 and n is different from 0. Preferably, the composition contains 0.0001-3% by weight of the silanol condensation catalyst.

Abstract: Olefins or mixtures of olefins, particularly propene or mixtures of propene advantageously with ethene, can be polymerized using a Ziegler-Natta catalyst system containing, besides a transition-metal-based procatalyst and cocatalyst which is an organometallic compound, a compound particularly suited for controlling the stereospecificity of the produced polymer. Such a compound called an external donor may also have other effects. By using an acetal derivative of an aldehyde that has two ether groups for this purpose, advantageously selected from the group of dialkoxyphenylalkanes, e.g., dimethoxyphenylpropane, a good stereospecificity of the product is attained combined with the high hydrogen sensitivity of the catalyst system, whereby the use of hydrogen as the chain transfer agent offers an easy control method of the molecular weight of the product by means of adjusting the amount of hydrogen available in the polymerization reaction.

Abstract: The invention relates to a method for preparing polyolefins. In the polymerization, a procatalyst composition is being used, which has been prepared by contacting MgCl.sub.2, a lower alcohol, a titanium compound and a phthalic acid ester. The polyolefin is given the adequate coarseness by using a procatalyst of the said type, which has been prepared by carrying out a transesterification between the lower alcohol and the phthalic acid ester and by selecting dioctyl phthalate (DOP) as phthalic acid ester.

Abstract: The invention relates to a method for preparing polyolefins by polymerizing an olefin with a procatalyst composition prepared by bringing together MgCl.sub.2, a lower alcohol, a titanium compound and a phthalic acid ester. The invention also relates to a polyolefin obtained by polymerizing an olefin in the presence of a procatalyst prepared by bringing together MgCl.sub.2, a lower alcohol, a titanium compound and a phthalic acid ester, as well as to a procatalyst composition suitable for the preparation of a large-pore polyolefin, which composition has been prepared by bringing together MgCl.sub.2, a lower alcohol, a titanium compound and a phthalic acid ester.

Abstract: A method for modifying polyolefins by grafting with a carboxylic acid, carboxylic acid anhydride or other functionalized monomer in the presence of two additional comonomers, one being an aliphatic diolefin and the other an aromatic vinyl or (meth)acrylate monomer.

Abstract: The invention relates to sealable and peelable polymer composition which comprises 5-35 weight-% styrene modified ethylene copolymer and 95-65 weight-% ethylene butyl acrylate copolymer. Ethylene copolymer is preferably ethylene butylacrylate copolymer (E/BA) or ethylene vinyl acetate copolymer (E/VA).

Abstract: Olefin polymerization catalysts the procatalyst component of which comprises a transition-metal compound on a magnesium chloride support material are known to all. Now the procatalyst component has been improved by incorporating a manganese (II) halide into it at a rate of at minimum approx. 0.1% and at maximum approx. 50% of the total molar amount of magnesium chloride and manganese (II) halide. The new polymerization catalyst has, among other things, the excellent special property that it yields a polyolefin with a broad molecular weight distribution.

Abstract: The invention relates to sealable and pealable polymer compositions which contain 20-80 weight % polyolefin and 80-20 weight % ethylene-hyaroxyacrylate co- or terpolymer in which as one comonomer is 5-30 weight % hydroxyacrylate and as another comonomer 0-40 weight % vinyl compound. The composition is pealable also after heat processing.

Abstract: The invention concerns an unsaturated ethylene copolymer, a method for producing the ethylene copolymer, and the use of the ethylene copolymer in compositions for producing cross-linked structures, such as material for electric cables. In the method, ethylene and at least one monomer which is copolymerizable with ethylene and includes a polyunsaturated comonomer having a chain of at least 8 carbon atoms and at least 2 non-conjugated double bonds, of which at least one is terminal, are polymerized at a pressure of about 100-300 MPa and a temperature of about 80.degree.-300.degree. C. under the action of a radical initiator. The polyunsaturated comonomer preferably is an .alpha.,.omega.-alkadiene having 8-16 carbon atoms, most preferred 1,9-decadiene. Apart from the polyunsaturated comonomer, polymerization may also involve another vinyl-unsaturated monomer, preferably containing at least one functional group selected from hydroxyl groups, alkoxy groups, carbonyl groups, carboxyl groups and ester groups.

Abstract: The invention relates to a process for the preparation of a solid procatalyst composition of a catalyst system for the polymerization of olefins wherein a magnesium halide such as magnesium chloride is dissolved and/or suspended into an alkyl ester of a monocarboxylic acid such as ethyl acetate, impregnated to a carrier, treated with an organometallic compound or a silicon compound and thereafter with a transition metal compound. The invention also relates to a procatalyst composition and its use together with a cocatalyst for the polymerization of olefins. The activity has been enhanced according to the invention by the use of a carrier containing hydroxyl groups, which carrier is kept at a temperature of at most about 200.degree. C. prior to the impregnation so that the hydroxyl groups are retained in the carrier to an essential extent until the impregnation step. The carrier is preferably silica which is treated thermally at 100.degree.-200.degree. C.

Abstract: A method for the preparation of a solid procatalyst suitable for the polymerization of olefins wherein the procatalyst comprises a transition metal compound reacted with a carrier by carrying out in the method the following consecutive steps: (a) feeding the transition metal compound and particles of the carrier into a vessel, which in its initial position has an essentially horizontal bottom sieve, (b) mixing and reacting the metal transitional compound and the particles of the carrier to produce raw procatalyst particles and a liquid reaction residue, (c) removing the liquid reaction residue through the bottom sieve of the vessel, (d) washing the raw procatalyst particles with a washing liquid, so that impurities in the raw procatalyst are removed through the bottom sieve, (e) drying the washed raw procatalyst particles by conducting an inert gas therethrough to give the solid procatalyst, and (f) removing the solid procatalyst from the vessel.

Abstract: The invention relates to a method for preparing a particulate carrier for an olefin polymerization procatalyst comprising a complex of an organic compound/transition metal compound as a carrier. In the method a melt MgCl.sub.2 --C.sub.2 H.sub.5 OH-complex is provided containing on average 3.3 to 5.5 C.sub.2 H.sub.5 OH-molecules per each MgCl.sub.2 -molecule, the melt MgCl.sub.2 -complex is sprayed through a nozzle dispersing it into a chamber, wherein a particulate carrier is formed of it and the particulate carrier is removed from the chamber. Unlike prior known methods to produce a carrier having an optimal C.sub.2 H.sub.5 OH content in this invention the removal rate--by the aid of heat--of C.sub.2 H.sub.5 OH from the MgCl.sub.2 --C.sub.2 H.sub.5 OH-complex in connection with the spraying that the particulate carrier is controlled. As a result, the particulate carrier obtained possesses on average 2.0 to 3.2 C.sub.2 H.sub.5 OH molecules per each MgCl.sub.2 molecule. Such a carrier has a suitable C.sub.2 H.

Abstract: The present invention relates to a procatalyst composition for the polymerization of alpha-olefines, which has been prepared in steps, in which is arranged a carrier agent based on at least one inorganic oxide, having few or no hydroxyl groups on its surface, and the carier agent is reacted with the magnesium compound and one or more transition metal compounds of the groups IVB and VB of the periodic table.

Abstract: It is known that an electron donor together with a compound of tetravalent titanium on a magnesium halide carrier is usable if it is a mono- or polyester of an unsaturated polycarboxylic acid in which at least two carboxyl groups are joined to contiguous carbon atoms which form double bonds. It has now been observed that activity and stereospecificity increase if at least one of the said carbon atoms, or a carbon atom joined thereto by a double bond, is substituted by a hydrocarbon group having 1-20 carbon atoms. Maleic and fumaric acid esters substituted with the said hydrocarbon group can be mentioned as examples.

Abstract: The invention relates to a method for the preparation of a solid procatalyst composition for a catalyst system intended for the polymerization of olefins, wherein a magnesium halide, such as magnesium chloride, is dissolved and/or slurried in a mono-carboxylic acid alkyl ester, such as ethyl acetate, is impregnated into a support material, dried, treated with an organometallic compound or a silicon compound and thereafter with a transition metal compound. The invention also relates to such a procatalyst composition and its use together with a cocatalyst for the polymerization of olefins. According to the invention it has been possible to increase the activity of the catalyst composition by using a silanated support material, such as silanated silica, which is then treated with an organometallic or silicon compound before treatment with a transition metal compound. The silanated silica is preferably a silicon dioxide which has been heat-treated at 1000.degree.-200.degree.

Abstract: A method is provided for controlling the dosage of a fluidized polymerizing catalyst into a polymerization reactor. The method comprises mixing a solid polymerization catalyst with wax and feeding the flowing catalyst-wax mixture through a pipe to the dosage pump. The inlet opening of the cylinder of the dosage pump is opened to draw catalyst-wax mixture through the inlet opening by means of the back motion of the piston. The inlet opening is then closed and the outlet opening is opened. Flowing catalyst-wax mixture is then pressed from the cylinder through the outlet opening by means of the back motion of the piston. The outlet opening is then closed. Opening and closing of the inlet and outlet openings is carried out by rotating an intermediate pipe arranged between the cylinder and piston so that a transmission opening in the intermediate pipe moves upon either the inlet or outlet opening. The intermediate pipe surface always covers at least one of the inlet or outlet openings.