Process for preparing novel petroleum resin employing AlRX.sub.2

Details Process for preparing novel petroleum resin employing AlRX.sub.2 Process for preparing novel petroleum resin employing AlRX.sub.2

1975-04-07

1977-07-26

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526290, C08F 452, C08F 1000, C08F12000, C08F13600

Patent

active

040384748

ABSTRACT:
A novel petroleum resin having not only a relatively low molecular weight but a narrow molecular weight distribution and having excellent characteristics as a tackifier particularly suitable for use in hot-melt adhesives and also suitable for synthetic rubbers, adhesive tapes, sealants, and the like, which resin is obtained by copolymerizing 20 to 80 parts by weight of a so-called spent C.sub.4 - or C.sub.5 -fraction obtained by removing most of the dienic constituents from the fractions mainly of C.sub.4 or C.sub.5 carbon atoms produced by petroleum cracking and 80 to 20 parts by weight of styrene and/or a styrene derivative with a catalyst system comprising an organoaluminum compound represented by the general formula AlRX.sub.2 (wherein R is an alkyl group having 1 to 4 carbon atoms and X is a halogen atom) as main catalyst and an alkyl halide or a hydrogen halide as co-catalyst, in a hydrocarbon solvent at a temperature of 0.degree. to 60.degree. C.

REFERENCES:
patent: 2523150 (1950-09-01), Schneider et al.
patent: 2604465 (1952-07-01), Schneider et al.
patent: 2770614 (1956-11-01), Howarth et al.
patent: 3644252 (1972-02-01), Shenfeld et al.
patent: 3860543 (1975-01-01), Masuda et al.
patent: 3875095 (1975-04-01), Yamada et al.

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