Hot melt adhesive composition and tape
AssigneeJohnson & Johnson
InventorRalf Korpman
Life of this patent
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Abstract
A hot melt pressure-sensitive adhesive composition and tape wherein the adhesive comprises an elastomeric component based on an elastomeric and thermoplastic A-B-A block copolymer wherein the B blocks are derived from isoprene and the A blocks are derived from styrene, and a unique tackifier component based on a blend of solid and liquid tackifier resins. The elastomeric and tackifier components are combined in specific proportions, as are the solid and liquid tackifier resins in the tackifier component. Preferred solid and liquid tackifier resins are disclosed.
Claims5
A substantially oil-free hot melt pressure-sensitive adhesive composition comprising an elastomeric component which comprises a major amount by weight of said component of an A-B-A block copolymer wherein B is an elastomeric polymer block derived from isoprene and A is a thermoplastic polymer block derived from styrene, said A blocks constituting about 8-35 percent by weight of the block copolymer;
- and about 125-300 parts per one hundred parts by weight of the elastomeric component of a tackifying component consisting essentially of a blend of normally solid and liquid tackifier resins, the proportion of solid resin to liquid resin in the blend being between about 4 to 1 and 1 to 3, said solid resins being normally friable at about 25.degree. C. and said liquid resins being in a liquid state at about 25.degree. C., and said solid resins consisting essentially of polymerized structures derived from aliphatic dienes and mono-olefins of 5 or 6 carbon atoms, at least 40 percent by weight of said structures being derived from piperylene or from piperylene and isoprene.
Dependencies are inferred from the claim text.