Patent EP0288226A2 successfully refreshed from Google Patents.
EP0288226A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for reducing the melt flow of olefin polymer products
Assignee: Shell USA Inc
•
Filing: 1988-04-15
•
Granted: —
•
Expires: 2008-04-15
Abstract
Abstract A process for adjusting the melt flow of an olefin polymer product during a polymerization reaction comprising the polymerization of at least one alpha olefin in the presence of a polymerization catalyst, polymerization cocatalyst, and hydrogen as a molecular weight control agent, characterised by reacting at least part of the hydrogen with at least part of the alpha olefin in the presence of a hydrogenation catalyst when it is desired to reduce the melt flow of the polymer product.
Inventors
- 👤 Israel Gershon Burstain
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 08:37
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/38; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/904; Y10S526/905
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
79 words
A process for adjusting the melt flow of an olefin polymer product during a polymerization reaction comprising the polymerization of at least one alpha olefin in the presence of a polymerization catalyst, polymerization cocatalyst, and hydrogen as a molecular weight control agent, characterised by reacting at least part of the hydrogen with at least part of the alpha olefin in the presence of a hydrogenation catalyst when it is desired to reduce the melt flow of the polymer product.
Claim 2
Dependent Claim
79 words
A process for adjusting the melt flow of an olefin polymer product during a polymerization reaction comprising the polymerization of at least one alpha olefin in the presence of a polymerization catalyst, polymerization cocatalyst, and hydrogen as a molecular weight control agent, characterised by reacting at least part of the hydrogen with at least part of the alpha olefin in the presence of a hydrogenation catalyst when it is desired to reduce the melt flow of the polymer product.
Claim 3
Dependent Claim
16 words
A process according to claim 1, wherein the hydrogen concentration is 0.01 mole% to 20 mole%.
Claim 4
Dependent Claim
30 words
A process according to claim 1 or 2, wherein said hydrogenation catalyst is at least one of a transition metal catalyst, benzenetricarbonylchromium, dibenzenechromium, dihydridochlorotris(triphenylphosphine) iridium (III), hydridodichlorotris(triphenylphosphine)iridium (III) and dicarbonylcyclopentadienylcobalt.
Claim 5
Dependent Claim
25 words
A process according to claim 3, wherein the transition metal catalyst is a supported nickel catalyst, a supported platinum catalyst or a supported palladium catalyst.
Claim 6
Dependent Claim
19 words
A process according to claim 4, wherein the support is at least one of alumina, silica, carbon and carborundum.
Claim 7
Dependent Claim
15 words
A process according to claim 4 or 5, wherein said nickel catalyst is bis-1,5-cyclooctadiene nickel.
Claim 8
Dependent Claim
24 words
A process according to claim 4, 5 or 6, wherein said nickel catalyst has been stabilized with an alkyl aluminium in a hydrocarbon solvent.
Claim 9
Dependent Claim
13 words
A process according to claim 7, wherein said alkyl aluminium is triethyl aluminium.
Claim 10
Dependent Claim
15 words
A process according to claim 4 or 5, wherein said nickel catalyst is nickel octanoate.
Claim 11
Dependent Claim
39 words
A process according to any one of the preceding claims, wherein the hydrogenation catalyst is contained in a fixed bed external to the reactor and at least part of the reactor contents are circulated through the external fixed bed.
Claim 12
Dependent Claim
36 words
A process according to any one of claims 1 to 9, wherein the hydrogenation catalyst is added to the reactor in an amount of 0.01 to 3000 ppm based on the total weight of reactor contents.
Claim 13
Dependent Claim
30 words
A process according to claim 11, wherein the amount of hydrogenation catalyst added to the reactor is 0.1 to 100 ppm based on the total weight of the reactor contents.
Claim 14
Dependent Claim
30 words
A process according to claim 12, wherein the amount of hydrogenation catalyst added to the reactor is 1 to 20 ppm based on the total weight of the reactor contents.
Claim 15
Dependent Claim
26 words
A process according to claim 13, wherein the amount of hydrogenation catalyst is 5 to 15 ppm based on the total weight of the reactor contents.
Claim 16
Dependent Claim
23 words
A process according to any one of claims 11 to 14, wherein after use the hydrogenation catalyst is removed together with polymer product.
Claim 17
Dependent Claim
26 words
A process according to any one of the preceding claims, wherein said reactor is a gas phase reactor, liquid phase reactor, solvent/slurry reactor or solution reactor.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.