Exxon Research and Engineering Company

Vincent L Hughes

Francisco M Benitez

Robert D Lundberg

Pawan K Agarwal

Augustus B Small

Andre Lepert

Jacques B Lechat

Bernard Bossaert

Raymond C Yap

Ralph W Looney

This invention relates to pressure sensitive adhesive formulations which include a saturated midblock thermoplastic elastomer such as a block copolymer of polystyrene and hydrogenated polydiene such as Kraton.RTM. G and a fully saturated tackifying resin derived from petroleum feedstock polymerized in the presence of aluminum chloride and having a Mn ranging from 400 to 800, a softening point of 40.degree. to 70.degree. C. and a glass transition temperature less than 45.degree. C. whereby the adhesive formulations have a rolling ball tack of less than 10 cm., a 180.degree. peel of from 1 to 4 pounds per inch, a 90.degree. quick stick of from 0.5 to 2.0 pounds per inch and a Polyken probe tack of higher than 400 g/cm.sup.2 with a formulation containing 100 to 180 phr of the saturated tackifying resin.

Fully saturated petroleum resin and hot melt pressure sensitive adhesive

Hydrogenated hydrocarbon resins from cyclopentadiene and/or substituted cyclopentadiene of softening point below 90.degree. C. and having a (Tg) as from 35 to 70 lower than the softening point with less than 12 wt. % of the resin having a molecular weight above 1000 are particularly useful as tackifiers in pressure sensitive adhesives especially in hydrogenated styrene/butadiene/styrene block copolymer adhesive formulations where their use can obviate the need for plasticizing oil.

Novel hydrocarbon resins and their use in adhesives

Petroleum resins of lightened color while retaining satisfactory melting point and compatiblity are provided by a process which comprises heat soaking a petroleum cracking or reforming fraction containing cationically polymerizable hydrocarbons and from 2 to more than 0.5 weight percent of cyclodienes until the cyclodiene content is no more than 0.5 weight percent distilling said heat soaked petroleum fraction and polymerizing said distilled petroleum fraction in the presence of a polymerization catalyst.

Process for preparing light colored petroleum resins and resins produced

This invention relates to pressure sensitive adhesive formulations which include a block copolymer of styrene and isoprene such as Kraton.RTM. D and a tackifying resin derived from petroleum feedstock polymerized in the presence of aluminum chloride and having a Mw ranging from 800 to 960, a Mn ranging from 500 to 600 with a Mw/Mn ratio of from 1.3 to 1.9, a softening point of 78.degree. to 81.degree. C. and a glass transition temperature of about 50.degree. C. whereby the adhesive formulations have a rolling ball tack of less than 5 cm., a 180.degree. peel of higher than 3 pounds per inch, a 90.degree. quick stick of higher than 3 pounds per inch and a Polyken tack of higher than 1,000 g/cm.sup.2.

Petroleum resin and pressure sensitive adhesive formulations utilizing

Hydrocarbon resins having an increased softening point are obtained by a process featuring the sequential steps of: isomerizing the 2-methylbutene-1 component of a branched olefin modifier stream whereby its 2-methylbutene-2 content is enriched; polymerizing a feedstock consisting of the mixture of said enriched modifier stream and a piperylene rich feed stream; and, recovering said hydrocarbon resin with properties enhancing its utility for adhesive applications.

Isomerization and polymerization of hydrocarbon resins

Petroleum resins of lightened color while retaining satisfactory melting point and compatibility are provided by a process which comprises heat soaking a petroleum cracking or reforming fraction containing cationically polymerizable hydrocarbons and from 2 to more than 0.5 weight percent of cyclodienes until the cyclodiene content is no more than 0.5 weight percent distilling said heat soaked petroleum fraction and polymerizing said distilled petroleum fraction in the presence of a polymerization catalyst.

This invention relates to hot melt adhesive compositions which includes a hydrogenated block copolymer block such as Kraton G, about 25 to about 250 parts by weight of a hydrocarbon resin made from a petroleum or coal tar distillate, aliphatic dienes and mono and diolefins, cyclic olefins of 5 to 6 carbon atoms and hydrogenated polycyclics per 100 parts by weight of the hydrogenated block copolymer, and about 25 to about 200 parts by weight of a polybutene or polyisobutylene per 100 parts of the hydrogenated block copolymer.

Hot melt adhesive compositions

This invention relates to pressure sensitive adhesive compositions which includes a hydrogenated block copolymer such as Kraton G, about 25 to about 250 parts by weight of a hydrocarbon resin of a petroleum or coal tar distillate, aliphatic dienes and mono- and diolefins, cyclic olefins of 5 or 6 carbon atoms and hydrogenated poly cyclics per 100 parts by weight of the hydrogenated block copolymer, and about 25 to 200 parts by weight of a polybutene or polyisobutylene per 100 parts of the hydrogenated block copolymer, wherein said mixture of Kraton G, said hydrocarbon resin and said polybutene or polyisobutylene are dissolved in a non-reactive solvent at a concentration level of about 5 to about 25 grams per 100 mil of non-reactive solvent.

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Baton Rouge, LA, United States of America

Vincent L Hughes