Appeal No. 1997-3906
Application No. 08/233,482
APPENDIX
12. A process for the low-temperature extrusion coating
of a substrate with a polyethylene film having a thickness of
at least about 0.0075mm, said process comprising applying a
composition to at least one surface of said substrate by
extrusion coating at a temperature in the range of 175E up to
290EC said composition comprising:
(a) a polyethylene component having a melt index in
the range of about 10 up to 100 dg per minute at
190EC and having a sufficiently broad molecular
weight distribution so that the resulting
composition is capable of being extrusion coated at a
temperature in the range of 175EC up to 290EC,
(b) in the range of about 0.5 up to 15 weight
percent, based on the weight of the total of (a)
plus (b), of a hydrocarbon tackifying resin having a
RBSP in the range of about 90E up to 150EC, and
(c) at least one thermally sensitive additive that
is not sensitive at a point within the range of 175E to
190EC [sic, 290EC] at relatively high loadings of
additives that contain a sufficient amount of
volatiles that create unsatisfactory imperfections at
relatively high temperatures, and a concentration in
excess of about 10 weight percent based on the total
wherein said thermally sensitive additive is a
hygroscopic or hydrophilic additive.
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