Method for the preparation of non-crystalline polymers of high molecular weight
US4358572A · kind A · utility
40Cited by
2References
9Claims
0Family size
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Key dates
| Filing date | May 7, 1981 |
| Grant date | Nov 9, 1982 |
| Priority date | — |
| Expiry date | May 7, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/0391
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for the preparation of a drag reducing substance which comprises: PA1 (a) a transition metal catalyst slurry containing: PA2 1. crystalline titanium halide having the general formula TiXn where n=2.5 to 3.0 and X is halogen, PA2 2. a hydrocarbon diluent, and PA2 3. an ether; PA1 (b) a co-catalyst; PA1 (c) alpha-monoolefinic hydrocarbons containing from 2 to 30 carbon atoms under suitable polymerization conditions providing for an ultrahigh molecular weight polymer that is soluble in hydrocarbons; and PA1 (d) ceasing the polymerization at a polymer content of 20 percent by weight or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.