Process for preparing elastomers for pressure-sensitive adhesive application
AssigneeGulf Research & Development Company
InventorsPallavoor R. Lakshmanan, Harold E. Swift, Ching Y. Wu
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Abstract
A process for producing an elastomer comprising selected copolymerized C.sub.5 -hydrocarbons from a hydrocarbon mixture containing C.sub.5 -monoolefinic hydrocarbons, C.sub.5 -diolefinic hydrocarbons (cyclic and acyclic) C.sub.5 -paraffins, C.sub.6 -aliphatics and benzene which comprises separating the C.sub.5 -hydrocarbons from the mixture and copolymerizing a selected portion of the resulting C.sub.5 -hydrocarbon mixture in the presence of a catalyst system to form an elastomer. The elastomers produced are suitable for use in adhesive compositions in general but particularly useful as a component in pressure sensitive adhesive compositions.
Claims18
In a process for preparing an elastomer comprising copolymerized C.sub.5 -hydrocarbons prepared from a hydrocarbon mixture containing C.sub.5 -monoolefinic hydrocarbons, C.sub.5 -diolefinic hydrocarbons C.sub.5 -paraffins, C.sub.6 -paraffins and benzene which comprises (A) heat-soaking said hydrocarbon mixture at a temperature sufficient to dimerize cyclopentadiene;
- (B) separating the resulting hydrocarbon mixture from the cyclopentadiene dimer;
- (C) copolymerizing the resulting hydrocarbon mixture in the presence of a catalyst which comprises an iron complex, a trialkyl aluminum and a bidentate ligand capable of both pi and sigma bonding to form an elastomer.
Dependencies are inferred from the claim text.