Appeal No. 1996-3934
Application 08/288,670
forming a polyolefin composition comprising a polyolefin
resin, an organic phosphite ester stabilizer, and a metal salt
of a lactic acid, said phosphite stabilizer being selected
from the group consisting of tetrakis(2,4-di-t-butyl-
phenyl)4,-4'-biphenylylene diphosphonite, tris(2,4-di-t-
butylphenyl)
-phosphite, trisnonylphenyl phosphite, bis(2,4-di-t-
butylphenyl)pentaerythritol diphosphite, and
bis(distearyl)pentaerythritol diphosphite, said metal salt
being a bivalent salt of lactic acid, said polyolefin
composition comprising from 90 to 99.5 weight percent
polyolefin resin, from 0.001 to 5 weight percent phosphite
stabilizer, and from 0.01 to about 5 weight percent of said
metal salt,
b) melt extruding said composition through a filtration
system to produce a filtered polyolefin melt stream, said
filtration system (sic. comprising) a plurality of filter
screens,
c) passing said filtered melt stream through an elongated
die orifice to form a polyolefin film.
The references of record relied upon by the examiner are:
Yukawa 4,366,280 Dec. 28, 1982
Allen et al. (Allen) 4,425,464 Jan. 10, 1984
The appealed claims stand rejected under 35 U.S.C. § 103
as unpatentable over Allen in view of Yukawa and admissions of
prior art (specification, page 10).
We cannot sustain the stated rejection.
The subject matter on appeal is directed to an extrusion
process for making a polyolefin film by melt extruding a
particular polyolefin composition through a filtration system
comprising a plurality of filter screens to produce a filtered
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