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US 4,046,838 AGranted
Adhesive compositions of a block copolymer and tackifying resin
AssigneeThe Goodyear Tire & Rubber Company
InventorGeorge W. Feeney
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AssigneeThe Goodyear Tire & Rubber Company
InventorGeorge W. Feeney
Estimating the term…
A composition which comprises a mixture of (a) an unvulcanized elastomeric block copolymer having the general configuration A -- B -- A, where A is a non-elastomeric styrene polymer block and B is an elastomeric diene polymer block of 1,3-butadiene and (b) a tackifying resin containing carbon-to-carbon unsaturation, characterized by having a softening point of about 60.degree. C. to about 110.degree. C. and comprising about 30 to about 55 weight percent units derived from piperylene, about 20 to about 45 weight percent units derived from 2-methyl-2-butene, about 15 to about 30 weight percent units derived from dicyclopentadiene and about 20 to about 35 weight percent units derived from .alpha.-methyl styrene. The composition has particular utility as a pressure-sensitive adhesive.
A pressure sensitive adhesive which comprises a mixture of (a) an unvulcanized elastomeric block copolymer comprised of both non-elastomeric and elastomeric polymer blocks having the general configuration A -- B -- A wherein each A is an independently selected non-elastomeric styrene polymer block having an average molecular weight of 5000 to 30,000 and a glass transition temperature above about 25.degree. C., the total block A content being from about 10 to about 50 percent by weight of the copolymer, and B is an elastomeric conjugated diene polymer block of 1,3-butadiene having an average molecular weight from about 50,000 to about 500,000 and a glass transition temperature below about 10.degree. C., said copolymer having a tensile strenght at 25.degree. C., in excess of about 200 pounds per square inch, prepared by first strength polymerizing sytrene with a lithium-based initiator to a polymer of molecular weight in the range of about 5,000 to about 30,000, followed by adding 1,3-butadiene and additional amounts of styrene to the polymerization mixture, and (b) about 20 to about 80 weight percent of a compatible, thermoplastic tackifying resin containing carbon-to-carbon unsaturation therein, based on the total tackifying resin and block copolymer, and characterized by having a softening point in the range of about 70.degree. C. to about 110.degree. C. consisting essentially of from about 30 to about 55 weight percent units derived from piperylene, from about 20 to about 45 weight percent units derived from 2-methyl-2-butene, from about 20 to about 35 weight percent units derived from dicyclopentadiene and from about 20 to about 35 weight percent units derived from .alpha.-methyl styrene prepared by the method which comprises polymerizing said monomers in the presence of aluminum chloride and a solvent selected from aliphatic hydrocarbons and steam stripping the resin product.
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
Conjugated: conjugated hydrocarbons other than butadiene or isoprene
Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon…: vinyl…
Organic macromolecular compounds, natural resins, waxes or and bituminous materials: macromolecular compounds according to groups C08L7/00 -…
Of polyester [e.g., alkyd, etc.]: next to addition polymer from unsaturated monomers
Term ended 6 Sep 1994 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
The invention relates to adhesive compositions and to methods for their preparation. While the invention is not restricted thereto, it has particular reference to pressure-sensitive adhesives. It further relates to pressure-sensitive tapes.
Various adhesives can advantageously be used as pressure-sensitive, laminate and hot melt adhesives. Most are generally known for their ability to form bonded laminated articles and some are more particularly known as pressure-sensitive adhesives and some as hot melt adhesives.
Pressure-sensitive adhesives and adhesive-coated masking tapes and the like are well known. These products commonly contain natural rubber and a thermoplastic tackifier resin compatible therewith. The adhesive, coated on a flexible backing to form a tape, is tacky at normal room temperatures and adheres instantly and tightly to surfaces against which it is pressed without requiring moistening or heating. It typically is required to have good shear strength, 180.degree. peel strength and rolling ball tack in order to be commercially useful.
Into a reactor were placed 100 parts of heptane and 3 parts of anhydrous aluminum chloride. While continuously stirring the mixture, 200 parts of a hydrocarbon mixture were slowly added to the reactor over a period of about 90 minutes. The hydrocarbon mixture had the following composition:
______________________________________ Component Percent ______________________________________ Piperylene (1,3-pentadiene) 28.5 2-methyl-2-butene 28.0 Dicyclopentadiene 20.0 .alpha.-methyl styrene 20.0 Other unsaturated hydrocarbons containing 4 to 6 carbon atoms 3.5 100.0 ______________________________________
The temperature of the reaction was maintained in a range of about 25.degree. C. to 30.degree. C. After an hour of agitation from the time of final addition of the hydrocarbon mixture, approximately 5 parts water and 20 parts lime, hydrated calcium hydroxide, were added to neutralize and decompose the aluminum chloride. The mixture was filtered to remove particles of decomposed aluminum chloride and lime.