Shell Oil Comapny

David Lee Shafer

Glenn R Himes

David Romme Hansen

James R Erickson

Michael John Modic

Larry McArthur Kegley

Linda Joanne Oliveri

It has been surprisingly found that certain properties including adhesion strength to smooth surfaces may be improved by making hot melt adhesives from blends comprising a poly-1-butene polymer, a tackifier resin, and from 3 wt. % to 25 wt. % of a liquid or semi-liquid, hydrogenated or partially hydrogenated low molecular weight conjugated diene polymer prepared by anionic polymerization. Any one of the following three polymers can be used in the adhesive formulation of this invention: 1) a hydrogenated styrene isoprene diblock copolymer having a number average molecular weight from 4000 to 30,000, preferably 6000 to 15,000, a polystyrene content of 5 to 15 percent by weight, preferably 8 to 12 percent by weight, which is at least 75 percent hydrogenated, preferably at least 85 percent hydrogenated; or 2) a hydrogenated polydiene polymer which may have one diene block of either isoprene or butadiene or maybe a diblock polymer wherein one block is of isoprene and the other block is of butadiene, and wherein the polymer may have a terminal hydroxy group, and wherein the polymer has a number average molecular weight of 500 to 20,000, preferably 1000 to 10,000, and is at least 75 percent hydrogenated, preferably at least 85 percent hydrogenated; or 3) a polyisoprene homopolymer having a number average molecular weight of 15,000 to 40,000, preferably 20,000 to 30,000 which is at least 75 percent hydrogenated, preferably at least 85 percent hydrogenated.

Polybutene/liquid polydiene hot melt adhesive

This invention provides oil gel compositions which comprise a hydrogenated styrene-butadiene-styrene (SEBS) block copolymer (although other vinyl aromatic hydrocarbons may be used) which has an overall weight average molecular weight of from 30,000 to 300,000, a styrene block weight average molecular weight of from 4000 to 35,000, and a vinyl content of at least 45% by weight (% wt), preferably 45 to 90%, and an oil and, optionally, a polyolefin wax and/or an extender liquid. For every 100 parts by weight of copolymer, there should be at least 900 parts of oil or a mixture of oil and polyolefin wax and/or an extender liquid.

Oil gel formulations containing high vinyl content hydrogenated

This invention provides sealant compositions which comprise a hydrogenated styrene-butadiene-styrene (SEBS) block copolymer which has an overall weight average molecular weight of from 30,000 to 300,000, a styrene block weight average molecular weight of from 4000 to 35,000, and a vinyl content of at least 45% by weight (% wt), preferably 45 to 90%, and an adhesion promoting resin. For every 100 parts by weight of copolymer, there should be at least 20 parts of adhesion promoting resin.

Sealant formulations containing high vinyl content hydrogenated

This invention is an EPDM roofing membrane adhesive system which comprises an outer protective layer of EPDM and an adhesive layer coated on the underside of said EPDM layer to adhere the membrane to a similarly coated EPDM membrane or to the primed surface of a roof. The adhesive layer comprises from 40 to 60 percent by weight of a hydrogenated styrene-diene-styrene block copolymer having a polystyrene content of from 20 to 40 percent by weight and an overall weight average molecular weight of from 50,000 to 150,000, from 15 to 35 percent by weight of a polyphenylene ether resin having an intrinsic viscosity of less than 0.35 deciliters per gram or of a high softening point endblock resin and from 15 to 35 percent by weight of a tackifying resin. Preferably, the molecular weight of the block copolymer is from 50,000 to 100,000 and the intrinsic viscosity of the polyphenylene ether is less than 0.2.

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Houston, TX, United States of America

David Lee Shafer