| abstract |
The present invention describes an adhesive composition and article. The adhesive composition comprises a polyisobutylene polymer component; up to 20% by weight of a polyolefin copolymer comprising polymerized units of an acidic monomer; and optionally, at least one tackifier . The polyolefin copolymer typically contains C2 - C4 alkylidene units. The polyolefin copolymer contains polymerized units of carboxylic acid or an unsaturated derivative thereof. In some embodiments, the polyolefin copolymer has a melting temperature in the range of 50°C to 150°C. In some embodiments, the polyolefin copolymer has an acid value of less than 40 mgKOH/g, 35 mgKOH/g, 30 mgKOH/g, or 25 mgKOH/g. |