Adhesive composition and method of preparation
AssigneeThe Goodyear Tire & Rubber Company
InventorsGeorge W. Feeney, William G. Stevenson
Life of this patent
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Abstract
Adhesive composition comprised of an unvulcanized block polymer product and a compatible tackifier resin. Said adhesive composition is required to be prepared by (A) mixing a solution of a block styrene/isoprene polymer product with a solution of a tackifying resin and (B) optionally removing the solvent.
Claims12
An adhesive composition which comprises an admixture of an unvulcanized block polymer product and a compatible tackifier resin therefor prepared by the method which comprises (A) mixing (1) 100 parts by weight of a solution polymerizate comprised of 100 parts by weight of an unvulcanized block styrene/isoprene polymer product with an overall styrene polymer content in the range of about 10 to 35 weight percent and its polymerization solvent in the range of about 300 to about 1100 parts by weight with (2) about 50 to about 200 parts by weight of a solution polymerizate comprised of 100 parts by weight of a tackifying resin for said block polymer product and its polymerization solvent in the range of about 25 to about 1100 parts by weight and (B) removing said solvent from the prepared mixture prior to its application as an adhesive;
- wherein the total of said polymerization solvents is a solvent for the combination of said block polymer and said resin;
- wherein said block polymer polymerizate is produced by the process of contacting isoprene and a suitable amount of divinylbenzene under solution polymerization conditions with a polystyryllithium catalyst, said amount of divinylbenzene being from about 0.5/1 to about 10/1 moles of divinylbenzene per mole of active lithium catalyst;
- and wherein said tackifier resin polymerizate is prepared by copolymerizing in the presence of a catalyst selected from the group consisting of aluminum chloride, boron trifluoride and boron trifluoride etherate, a mixture of piperylene and at least one olefin containing 4-6 carbon atoms in a diolefin/olefin more ratio in the range of about 0.6/1 to about 2.5/1, optionally modified by copolymerizing about 5 to about 20 weight percent, based on the total monomers, of at least one additional monomer selected from .alpha.-methyl styrene and di-cyclopentadiene in which the resin itself has a softening point in the range of about 50.degree. C. to about 150.degree. C.
A method of preparing an adhesive composition which comprises (A) mixing (1) 100 parts by weight of a solution polymerizate comprised of 100 parts by weight of an unvulcanized block styrene/isoprene polymer product with molecular weight in the range of 8,000 to 45,000 and overall styrene polymer weight in the range of about 10 to 35 weight percent and its polymerization solvent in the range of about 300 to about 1100 parts by weight with (2) about 50 to about 200 parts by weight of a solution polymerizate comprised of 100 parts by weight of a tackifying resin for said block polymer product and its polymerization solvent in the range of about 25 to about 1100 parts by weight and (B) removing said solvent from the prepared mixture prior to its application as an adhesive;
- wherein the total of said polymerization solvents is a solvent for the combination of said block polymer and said resin;
- wherein said block polymer polymerizate is produced by the process of contacting isoprene and a suitable amount of divinylbenzene under solution polymerization conditions with a polystyryllithium catalyst, said amount of divinly benzene being from about 0.5/1 to about 10/1 moles of divinyl benzene per mole of active lithium catalyst and wherein said resin has a softening point in the range of about 50.degree. C. to about 120.degree. C.;
- and wherein said tackifier resin polymerixate is prepared by copolymerizing in the presence of a catalyst selected from the group consisting of aluminum chloride, boron trifluoride and boron trifluoride etherate, a mixture of piperylene and at least one olefin containing 4-6 carbon atoms in a diolefin/olefin mole ratio in the range of about 0.6/1 to about 2.5/1, optionally modified by copolymerizing about 5 to 20 weight percent, based on the total monomers of at least one additional monomer selected from .alpha.-methyl styrene and di-cyclopentadiene in which the resin itself has a softening point in the range of about 50.degree. C. to about 150.degree. C.
Dependencies are inferred from the claim text.