Liquid aliphatic resins
AssigneeExxon Chemical Patents Inc.
InventorSteven G. Hentges
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Abstract
A light color aliphatic hydrocarbon petroleum resin including a piperylene component and a chain transfer agent component useful as a tackifying agent, especially with copolymers. The resin of the invention has a softening point of about 0.degree.-40.degree. C., a number average molecular weight of from 100 to about 900, a low Gardner color of about 3 or less, and is formed by the aluminum chloride catalyzed polymerization of a feed stream essentially free of butadiene.
Claims14
A petroleum hydrocarbon resin suitable for use as a tackifier in an adhesive composition, said resin having a softening point of about 0.degree.-40.degree. C., a number average molecular weight Mn of about 100 to 900, a Gardner color of 6 or less, and a piperylene-derived content of about 5-50 weight percent, said resin being prepared by the aluminum chloride catalyzed Friedel-Crafts polymerization of a hydrocarbon feed comprising:
- (a) less than about 5 weight percent vinyl aromatic hydrocarbons;
- (b) less than 1 weight percent butadiene;
- (c) about 10-90 weight percent piperylene stream;
- and
- (d) about 90-10 weight percent monoolefin chain transfer agent stream.
An aluminum chloride-catalyzed petroleum hydrocarbon resin consisting essentially of about 5-40 weight percent piperylene and monoolefin chain transfer agent, said resin having a softening point of 15.degree.-30.degree. C., a Gardner color of 3 or less, a number average molecular weight Mn of about 400 to 700, and a molecular weight distribution of from 1.25 to 1.35.
Dependencies are inferred from the claim text.