Appeal No. 1997-4434
Application No. 08/189,053
Claims 1, 4 and 13 are representative of the subject
matter on appeal and read as follows:
1. A surfactant for forming stable dispersions of rosin
esters compatible with elastomeric latexes which comprises a
1 2 3 1 3
compound of the formula R -R -R , wherein R and R are selected
from the group consisting of a rosin ester and H, provided
1 3 2
that R and R are not both H, and R is selected from the
group consisting of polyethylene glycol and (polyethylene
4 4
glycol)-R -(polyethylene glycol) wherein R is rosin, and
wherein the polyethylene glycol has a molecular weight of from
about 1,500 to about 20,000 such that the surfactant is
substantially solid at room temperature.
4. A stable tackifier dispersion compatible with elastomeric
latexes comprising a rosin ester, water, and a surfactant
1 2 3 1 3
having the formula R -R -R , wherein R and R are selected from
1 3
the group consisting of rosin and H, provided that R and R
are not both H, and R is selected from the group consisting2
of polyethylene glycol and polyethylene glycol)-R -4
(polyethylene glycol) wherein R is rosin, and wherein the PEG4
has a molecular weight of from about 1,500 to about 20,000.
13. A method for preparing a surfactant for forming stable
dispersions of rosin ester, said method comprising estefifying
a rosin with polyethylene glycol, wherein the polyethylene
glycol has a molecular weight of from about 1,500 to about
20,000.
The sole prior art reference relied upon by the examiner
is:
Columbus et al. (Columbus) 4,057,527 Nov. 8,
1977
2
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