Seals for plastic bags

Details Seals for plastic bags Seals for plastic bags

1996-12-05

1998-12-22

Wu, David W.

Flexible bags

With closure

Rib and groove

428516, 428523, 525240, B65D 3316

Patent

active

058510702

ABSTRACT:
The present invention improves performance of the side and/or fin seals of plastic bags through the use of resins that have a narrow molecular weight distribution or polydispersity. The performance of the side seal and/or fin seal of a plastic bag is improved by using body panels which comprise a first resin, and optionally, a second resin. The first resin is preferably prepared in the presence of a single site catalyst. The first resin has a polydispersity of from about 1 to about 4, a melt index of from about 0.2 to about 20, and a melt flow ratio (I.sub.20 /I.sub.2) of from about 12 to about 35. The use of such first resins results in side and fin seals which are stronger, tougher, and less likely to leak. The second resin is a polymer such as LDPE, LLDPE, or a blend thereof In body panels comprising both a first and a second resin, the first resin may be coextruded with LDPE or LLDPE as a thin layer of the body panel or the first resin may be blended with the LDPE and/or LLDPE.

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