Appeal No. 1997-4433
Application No. 08/414,381
The subject matter on appeal relates to an adhesive
composition for adhering together roofing materials comprising
a rubbery polymer and a compatible tackifier wherein the
rubbery polymer comprises a blend of from about 12% or less by
weight of the total composition of an ethylene-propylene-diene
terpolymer. This composition results in a peel strength of at
least 1000 grams/cm at room temperature, and at least 500
grams/cm at 70EC. Further details of this appealed subject
matter are set forth in representative independent claim 1
which reads as follows:
1. A cured adhesive composition for adhering together
EPDM roofing materials comprising a) a rubbery polymer
comprising a blend of (i) from about 12% or less by weight of
the total composition of an ethylene-propylene-diene
terpolymer, (ii) a halogenated butyl rubber or a halogenated
copolymer of p-methylstyrene and isobutylene, and (iii)
polyisobutylene, and b) a compatible tackifier, said
composition being fully vulcanized prior to use by heating to
achieve essentially full crosslinking of the components, said
composition having a peel strength of at least 1000 grams/cm
at room temperature, at least 500 grams/cm at 70EC, and
support a static load of at least 300 grams at 70EC.
The reference relied upon by the examiner as evidence of
obviousness is:
Briddell et al. (Briddell) 5,242,727 Sep. 7, 1993
All of the appealed claims stand rejected under 35 U.S.C.
§ 103 as being unpatentable over Briddell.
2
Page: Previous 1 2 3 4 5 6 7 8 Next
Last modified: November 3, 2007