GB843750A - Improvements in or relating to the polymerization of olefins, and the resulting polyolefins - Google Patents
Improvements in or relating to the polymerization of olefins, and the resulting polyolefinsInfo
- Publication number
- GB843750A GB843750A GB37734/58A GB3773458A GB843750A GB 843750 A GB843750 A GB 843750A GB 37734/58 A GB37734/58 A GB 37734/58A GB 3773458 A GB3773458 A GB 3773458A GB 843750 A GB843750 A GB 843750A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oxides
- temperature
- catalyst
- aliphatic
- hydrocarbon
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
Abstract
Solid polyolefins are made by first mixing the olefin with a catalyst, described more fully below, which comprises oxides of chromium, aluminium, and silicon, in the presence of a solvent for the polymer under such conditions of temperature and pressure that substantially no polymerization occurs and then starting the polymerization by supplying heat to the polymerizable mix. The catalyst comprising the above ingredients is made by subjecting the abovementioned oxides to a reduction treatment, at a temperature not exceeding 180 DEG C., with a saturated aliphatic hydrocarbon or a saturated cyclo-aliphatic hydrocarbon, or an aliphatic-aromatic hydrocarbon which does not contain unsaturation in the aliphatic portion of the hydrocarbon until any chemically combined chromium is at least in part in a valency state of less than 6. The above oxides may be free oxides or oxides present as chemical compounds. The hydrocarbons which may also act as solvents in the polymerization may be isooctane, propane, butane, pentane, hexane, heptane, decane, cyclohexane, toluene, or a xylene. Olefins mentioned are ethylene and propylene. The preferred condition under which substantially no polymerization occurs is at a temperature below the temperature employed in the reduction of the catalyst. Specifications 804,641 and 804,642 are referred to.ALSO:A catalyst for polymerizing olefins, is made by subjecting a mixture comprising oxides of hexavalent chromium, aluminium, and silicon to a reduction treatment at a temperature not exceeding 180 DEG C., with a saturated aliphatic hydrocarbon, or a saturated cyclo-aliphatic hydrocarbon, or an aliphatic-aromatic hydrocarbon which does not contain unsaturation in the aliphatic portion of the hydrocarbon, until any chemically combined chromium is at least in part in a valency state of less than 6. The above oxides may be free or oxides present in chemical compounds. Hydrocarbons mentioned are iso-octane, propane, butane, pentane, hexane, heptane, decane, cyclohexane, toluene, or a xylene. The starting material for the catalyst is preferably made by impregnating a composition of alumina and silica with a solution of chromic acid or chromic nitrate, ammonium chromate, or ammonium dichromate and heating the treated product at a temperature of at least 300 DEG C. for some time, in the presence of dry air or a dry inert gas. The starting material may be in the form of a powder of particle size up to 1 millimetre. Prior to impregnation the material may be (a) treated with HF or a preferably volatile fluoride; (b) heat-treated in the presence of air or an oxygen - containing gas, preferably together with water vapour, although inert gas treatment is also mentioned. In an example the starting material, a commercial cracking catalyst consisting of fine spherical particles of a gel of alumina and silica was first heated for 10 hours to 650 DEG C. in an air stream then impregnated with an aqueous CrO3 solution, air dried at 120 DEG C. for one hour, then heated in a glass tube at 500 DEG C. in the presence of dry air and the tube sealed. The catalyst was then made by breaking the tube in an autoclave in an atmosphere of nitrogen in the presence of pure iso-octane at a reduction temperature between 30 and 130 DEG C. preferably the latter temperature. Specifications 804,641 and 804,642 are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL843750X | 1957-11-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB843750A true GB843750A (en) | 1960-08-10 |
Family
ID=19845086
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB37734/58A Expired GB843750A (en) | 1957-11-25 | 1958-11-24 | Improvements in or relating to the polymerization of olefins, and the resulting polyolefins |
Country Status (5)
Country | Link |
---|---|
BE (1) | BE573248A (en) |
DE (1) | DE1201998B (en) |
FR (1) | FR1217093A (en) |
GB (1) | GB843750A (en) |
NL (2) | NL222716A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3091605A (en) * | 1960-01-18 | 1963-05-28 | Eastman Kodak Co | Olefin polymerization catalyst pretreatment |
US3166537A (en) * | 1960-11-17 | 1965-01-19 | Phillips Petroleum Co | Chromium, tungsten or manganese oxide olefin polymerization catalyst activated with carbon monoxide and ultraviolet light and polymerization therewith |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
LU34020A1 (en) * | 1953-01-27 | 1956-02-06 |
-
0
- NL NL103863D patent/NL103863C/xx active
- BE BE573248D patent/BE573248A/xx unknown
- NL NL222716D patent/NL222716A/xx unknown
-
1958
- 1958-11-24 DE DEN15895A patent/DE1201998B/en active Pending
- 1958-11-24 GB GB37734/58A patent/GB843750A/en not_active Expired
- 1958-11-24 FR FR779895A patent/FR1217093A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE1201998B (en) | 1965-09-30 |
NL103863C (en) | |
NL222716A (en) | |
BE573248A (en) | |
FR1217093A (en) | 1960-05-02 |
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