Process for producing a polyolefin coating, substrate provided with the said coating, and its use for coming into contact with moving powders
AssigneeElf Atochem S.A.
InventorClaude Brun
Life of this patent
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Abstract
The process according to the invention consists in bringing the substrate to be coated into contact with a solution of a catalyst of olefin polymerization and in then polymerizing at least one olefin in gaseous phase in the presence of the said substrate. The invention also relates to the use of an item including a coating made of polymer for coming into contact with polyolefin particles, the polymer forming the coating including chain sequences of formula --CH.sub.2 --CHR--.
Claims57
Process for producing a polyolefin coating on a metal substrate, comprising:
- a) bringing the substrate into contact with a liquid composition comprising a catalyst of olefin polymerization, then
- b) separating the substrate from the said liquid composition, then
- c) conducting in situ gas-phase polymerization of at least one olefin in the presence of the substrate to form the polyolefin coating thereon.
Method of use of a product including a substrate and a polymer coating for coming into contact with polyolefin particles, comprising contacting said particles with a polymer in which the polymer constituting the coating includes chain sequences of formula --CH.sub.2 --CHR-- in which R denotes a hydrogen atom or an alkyl radical containing from 1 to 10 carbon atoms.
A process for producing a polyolefin coating on a metal substrate comprising:
- covering said substrate with a catalyst solution for olefin polymerization which includes:
- (a) a catalyst system comprising a derivative of a transition metal having formula ML.sub.x
- in which:
- M denotes the transition metal,
- L denotes at least one ligand coordinated to the transition metal, and
- x denotes a number equal to the valency of the transition metal;
- (b) a linear aluminoxane cocatalyst for activating the transition metal M and having the formula:
- ##STR5## or a cyclic one having the formula:
- ##STR6## in which:
- R denotes an alkyl radical containing from one to six carbon atoms, and
- n denotes an integer ranging from 2 to 40;
- (c) a solvent;
- and
- conducting in situ gas-phase polymerization of at least one olefin in the presence of said substrate to form the polyolefin coating thereon.
Process comprising reducing the phenomena of accumulation of electrostatic charges and of the covering of an item with aggregates of particles, said item being employed for coming into contact with polyolefin particles, wherein the item includes a substrate and a coating of polymer including chain sequences of formula CH.sub.2 --CHR-- in which R denotes a hydrogen atom or an alkyl radical containing from 1 to 10 carbon atoms.
Process comprising containing or conveying or agitating polyolefin particles in motion in a plant, wherein at least one item employed for coming into contact with said particles includes a substrate and a coating of polymer including chain sequences of formula CH.sub.2 --CHR-- in which R denotes a hydrogen atom or an alkyl radical containing from 1 to 10 carbon atoms.
Process comprising contacting an item with polyolefin particles in motion, wherein the item includes a substrate and a coating of polymer including chain sequences of formula CH.sub.2 --CHR-- in which R denotes a hydrogen atom or an alkyl radical containing from 1 to 10 carbon atoms.
A method of using a vessel to contain, convey and/or agitate polyolefin particles comprising coating the interior of the vessel with a polymer including chain sequences of formula CH.sub.2 --CHR-- in which R denotes a hydrogen atom or an alkyl radical containing from 1 to 10 carbon atoms;
- and containing, conveying and/or agitating polyolefin particles in the vessel with a reduction in a phenomena of accumulating electrostatic charges that result in covering the interior surfaces of the vessel with aggregates of the polyolefin particles.
A method of using a chemical reactor to contain, convey and/or agitate polyolefin particles comprising coating the interior of the reactor with a polymer including chain sequences of formula CH.sub.2 --CHR-- in which R denotes a hydrogen atom or an alkyl radical containing from 1 to 10 carbon atoms;
- and containing, conveying and/or agitating polyolefin particles in the reactor with a reduction in a phenomena of accumulating electrostatic charges that result in covering the interior surfaces of the reactor with aggregates of the polyolefin particles.
A method of reducing the accumulation of electrostatic charges and the formation of aggregates of polyolefin particles in plants in which said particles are set in motion, comprising utilizing for coming into contact with said particles an item including a substrate and a coating of a polymer including chain sequences of formula CH.sub.2 --CHR-- in which R denotes a hydrogen atom or an alkyl radical containing from 1 to 10 carbon atoms.
A vessel for containing, conveying and/or agitating polyolefin particles comprising a polymer coating the interior of said vessel, said polymer including chain sequences of formula CH.sub.2 --CHR-- in which R denotes a hydrogen atom or an alkyl radical containing from 1 to 10 carbon atoms.
Dependencies are inferred from the claim text.