Hydrocarbonaceous resins, method for their preparation and means therefor
AssigneeAnic S.p.A.
InventorsGiuseppe Ferraris, Sebastiano Cesca
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Abstract
A process for preparing hydrocarbonaceous resins from C.sub.5 fractions is disclosed in which the starting hydrocarbonaceous fraction is enriched with cis-piperylene. A catalyst system is also disclosed for the formation of the resins by polymerization and the simplest catalyst is an aluminum halide. In other embodiments, the aluminum halide is used together with a second component such as a hydrocarbyl halide and/or a halide of a metal selected from Sn, Si, B, Ti, Pb, Sb, As and others. Resins having improved physico-chemical properties are obtained.
Claims14
A process for the preparation of hydrocarbonaceous resins from C.sub.5 hydrocarbon fractions containing at least 22% by weight of cis-piperylene comprising passing a hydrocarbonaceous fraction exiting a steam-cracker to a dimerizer and subsequently to a plurality of distillation columns, separating said hydrocarbonaceous fraction into light components and heavy components, passing said heavy components through a rectification column, recovering as heads a fraction containing a high percentage of cis-piperylene and trans-piperylene, introducing the heads fraction into a polymerization reactor with butadiene and forming a copolymer of butadiene and transpiperylene, removing said copolymer and unreacted butadiene from the polymerization reaction and obtaining a C.sub.5 hydrocarbon fraction enriched with at least 22% by weight of cis-piperylene, polymerizing the enriched C.sub.5 hydrocarbon fraction in the presence of a catalyst selected from an aluminum halide of the formula AlX.sub.3, wherein X is a halogen atom or an organic metallic compound of aluminum having the general formula:
- R.sub.m AlX.sub.3-m
- wherein X is a halogen atom, R is hydrogen or a monovalent alkyl, aryl, cycloalkyl, aralkyl, alkaryl, alkoxy or ester radical having from 1 to 12 carbon atoms and m is a number from 1 and 3, in a solvent selected from the group consisting of aromatic hydrocarbon solvents and aliphatic, halogen-substituted hydrocarbon solvents containing from 1 to 12 carbon atoms and obtaining a hydrocarbonaceous resin adhesive enriched with cis-piperylene having a softening point from below 20.degree. C. up to 140.degree. C.
Dependencies are inferred from the claim text.