C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 297/04 (2006.01) A61F 13/58 (2006.01) A61L 15/58 (2006.01) C09J 153/02 (2006.01)
Patent
CA 2109826
Radial block copolymers characterized by the formulae: (1) (pS-pI)n X and (2) (pS-pI-pB)n X where pS is polystyrene, pI is polyisoprene, pB is butadiene, X is a residue of a multifunctional coupling agent used in the production of the radial block copolymer, and n is a number greater than 2 representative of the number of branches appended to X; hot-melt adhe- sive compositions constituted of said radial block copolymers, and articles of manufacture produced therefrom. These com- polymers possess blocks of high average molecular weight polystyrene (10,000 to 25,000) and an overall average molecular weight (90,000 to 380,000) such that when blended in requisite proportions with a compatible tackifier resin, preferably also a secondary tackifying resin or plasticizing oil, and stabilizer, superior hot- melt adhesive compositions can be formed. The hot-melt adhesive compositions possess, inter alia, superior heat resistance, superior static time to failure with low viscosity, good peel adhesion, good tack, and high ability to bond to a polyethylene or polypropylene substrate at temperatures below that which may damage the substrate.
Diehl Charles F.
Marchand Gary R.
Myers Michael O.
Tancrede Jean M.
Exxon Chemical Patents Inc.
Smart & Biggar
The Dow Chemical Company
Tsrc (usa) Investment Corporation
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