Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2005-07-05
2005-07-05
Sellers, Robert E.L. (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S457000, C525S458000, C428S425100, C524S424000, C524S430000, C528S045000, C528S061000, C528S065000, C528S066000, C528S067000
Reexamination Certificate
active
06914102
ABSTRACT:
A thermally curable hot-melt adhesive composition, comprisinga polyurethane prepolymer having isocyanate groups, wherein at least 50% of the reactive isocyanate groups of the prepolymer are blocked, said prepolymer being the reaction product of(1) 20 to 40 wt % of at least one straight-chain amorphous polyester having a number average molecular mass Mn of 3000 to 6000 with(2) 40 to 60 wt % of at least one polyurethane elastomer,(3) 10 to 20 wt % of at least one polyester elastomer,(4) at least one diisocyanate,(5) at least one polyol as a chain extender, and(6) at least one blocking agent; andat least one isocyanate reactive component selected from the group consisting of polyalcohols, polyamines and hydroxy-functionalized epoxide resins;wherein the percentages are based on the total weight of polyester, polyurethane elastomer and polyester elastomer.
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Kleineberg Olaf
Pfeiffer Heinz-Peter
Temeltas Engin
Benjamin Steven C.
E. I. du Pont de Nemours and Company
Sellers Robert E.L.
Zimmer Marc S.
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