B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 27/32 (2006.01)
Patent
CA 2548324
Stretch films which exhibit good puncture and impact resistance while also exhibiting resistance to defect propagation are desired. The films of the present invention have an ultimate stretch of at least 200 percent, a dart impact strength of at least about 700 gms/mil and a catastrophic failure stretch of at least 95 percent of the elongation to break value (CF of 5 or less). The films preferably comprise at least 3 layers and preferably comprise at least 50 percent by weight of polyethylene polymers.
L'invention concerne des films étirables présentant une résistance élevée à la perforation, aux chocs et à la propagation de défauts. Ces films présentent un étirement ultime d'au moins 200 %, une résistance aux chocs à la torpille d'au moins 700 gm/mil environ et un étirement de défaillance catalectique d'au moins 95 % d'élongation par rapport à la valeur de rupture (CF <= 5). Ces films comprennent de préférence au moins trois couches et au moins 50 % en poids de polymères de polyéthylène.
Dekunder Staci A.
Liang Wenbin
Nieto Jesus
Pirtle Shaun E.
Presa John L.
Dow Global Technologies Inc.
Dow Global Technologies Llc
Smart & Biggar
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