Pressure-sensitive adhesive compositions

Details Pressure-sensitive adhesive compositions Pressure-sensitive adhesive compositions

1977-08-08

1979-03-27

Bleutge, John C.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 4AR, 260888, 260889, 260890, 260892, 260893, 427207B, 526290, C08L 2510, C08L 2516, C08L 1500, C09J 314

Patent

active

041465148

ABSTRACT:
The invention relates to a pressure-sensitive adhesive composition which comprises a rubber component including at least 50 percent by weight of styrene-butadiene copolymers in combination with a resin component consisting of an aromatic hydrocarbon resin resulting from the polymerization of a thermally cracked petroleum fraction at temperatures in the range of -30.degree. to +60.degree. C. in the presence of Friedel-Crafts catalysts. The fraction as recovered from petroleum refining has a boiling range of 140.degree. to 220.degree. C. but is further fractionated to separate components boiling above and below about 180.degree. C. The material which is reacted has a conjugated diolefin content of 0.7 weight percent or less, and a ratio of conjugated diolefin content to total polymerizables of 3% or less. The total content of indene and its alkyl derivatives is 2 weight percent or less, and the ratio of indene content to total polymerizables is 8% or less. The fraction also contains significant amounts of vinyl toluenes boiling from 168.degree. to 171.degree. C.

REFERENCES:
patent: 3554940 (1971-01-01), Arakawa et al.
patent: 3652725 (1972-03-01), Diaz et al.
patent: 3681190 (1972-08-01), Dahlquist
patent: 3932332 (1976-01-01), Douglas et al.

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