Appeal No. 1997-2924
Application No. 08/320,726
The subject matter on appeal relates to an article of
manufacture having at least one weld line such as an
automobile fender made by injection molding via a composition
comprising a polyamide, a polypropylene and a resin
compatibilization agent, for example, maleinized
polypropylene. Further details of this appealed subject
matter are set forth in representative independent claim 1
which reads as follows:
1. An article of manufacture comprising per hundred parts
by weight a mixture of (i) 65 to 68 parts by weight of
polyamide, (ii) 20 to 30 parts by weight of a polypropylene
having a melt flow index, measured at 230EC/2.16 kg, lower
than 0.5, and (iii) 4 to 8 parts by weight of a resin
compatibilization agent selected from the group consisting of
maleinized polypropylene, maleinized polypropylene grafted
with PA6, and maleinized polypropylene grated with PA66/12 and
including at least one weld line, wherein (a) the ratio of the
viscosities of the polyolefin (ii) to the polyamide (i),
measured at a shear rate higher than 100 s , is greater than-1
0.70, and (b) the quantity of polyamide (i) is sufficient for
the elongation at break of said article to be greater than
10%.
The references relied upon by the examiner as evidence of
obviousness are:
Fukui et al (Fukui) 5,206,284 Apr.
27, 1993
Glotin et al. (Glotin)(EP) 0 342 066 Nov. 15,
1989
2
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