Polymerizing C.sub.5 and C.sub.6 olefins and diolefins with 3.degree. hydrocarbyl halide to produce narrow molecular weight petroleum resins having low softening points
AssigneeExxon Research & Engineering Co.
InventorAndre Lepert
Life of this patent
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Abstract
A petroleum resin is prepared by a process which comprises polymerizing using a Friedel-Crafts catalyst: A. a petroleum resin feed comprising C.sub.5 and C.sub.5 diolefins, C.sub.6 olefins and C.sub.6 diolefins or a mixture of C.sub.5 and C.sub.6 olefins and diolefins, said feed being obtained from the cracking of petroleum feedstock and B. at least 0.5 wt.% based on the petroleum resin feed of a tertiary hydrocarbyl halide. The resulting resin usually has a softening point of 20.degree. to 125.degree. C. These resins have an extremely narrow molecular weight distribution and hence have good wax compatibility, viscosity, flexibility and tackifying properties for rubber.
Claims13
In the process of preparing a low softening point petroleum resin which comprises polymerising using a Friedel-Crafts catalyst
- a. a petroleum resin feed comprising C.sub.5 olefins and C.sub.5 diolefins, C.sub.6 olefins and C.sub.6 diolefins or a mixture of C.sub.5 and C.sub.6 olefins and diolefins, said feed being obtained from the cracking of a petroleum feedstock the improvement which comprises including therewith
- b. at least 0.5 wt.% based on the petroleum resin feed of a tertiary hydrocarbyl halide to obtain a resin of narrowed molecular weight distribution having tackifying properties for natural and synthetic rubbers.
Dependencies are inferred from the claim text.