A film for stretch packaging comprising as a substrate a film of a linear low density polyethylene having a melt flow rate (190°C.), as measured by an ASTM-D-1238E method, of 0.3 to 8 g/10 min., a density, as measured by an ASTM-D-1505 method, of 0.900 to 0.918 g/cm3, a molecular weight distribution
A film for stretch packaging comprising as a substrate a film of a linear low density polyethylene having a melt flow rate (190°C.), as measured by an ASTM-D-1238E method, of 0.3 to 8 g/10 min., a density, as measured by an ASTM-D-1505 method, of 0.900 to 0.918 g/cm3, a molecular weight distribution (w/n) of 2 to 6, two or more melting points existing as measured by a differential scanning calorimeter, a maximum melting point Tm1 of 118°to 125°C. and a ratio of the height Tm1H of the peak of the highest melting point Tm1 to the height Tm1H of the melting point Tm2 adjacent thereto (i.e., Tm1H/Tm2H), of 1.3 or less.
대표청구항▼
In a method for stretch packaging a plurality of articles by wrapping the articles in a stretchable film while stretching said stretchable film about said articles, the improvement comprising using as said stretchable film a multi-layer film for stretch packaging and having a non-tacky surface and a
In a method for stretch packaging a plurality of articles by wrapping the articles in a stretchable film while stretching said stretchable film about said articles, the improvement comprising using as said stretchable film a multi-layer film for stretch packaging and having a non-tacky surface and a tacky surface, said multi-layer film comprising an intermediate layer of a linear low density polyethylene having a melt flow rate (190°C.), as measured by an ASTM-D-1238E method, of 0.3 to 8 g/10 min., a density, as measured by an ASTM-D-1505 method, of 0.900 to 0.918 g/cm3, a molecular weight distribution (M/M) of 2 to 6, two or more melting points existing as measured by a differential scanning calorimeter, a maximum melting point Tm1 of 118°to 125°C. and a ratio of the height Tm1H of the peak of the highest melting point Tm1 to the height Tm2H of the melting point Tm2 adjacent thereto (i.e., Tm1H/Tm 2H), of 1.3 or less, a non-tacky surface layer on one surface of said intermediate layer and comprising a non-tacky linear low density polyethylene having a density greater than 0.918 g/cm3, and, on the opposite surface of said intermediate layer, a tacky surface layer comprising a mixture of linear low density polyethylene having a melt flow rate (190°C.), as measured by an ASTM-D-1238E method, of 0.3 to 8 g/10 min., a density, as measured by an ASTM-D-1505 method, of 0.900 to 0.918 g/cm3, a molecular weight distribution (M/M) of 2 to 6, two or more melting points existing as measured by a differential scanning calorimeter, a maximum melting point Tm1 of 118°to 125°C. and a ratio of the height Tm1H of the peak of the highest melting point Tm1 to the height Tm2H of the melting point Tm2 adjacent thereto (i.e., Tm1H/Tm2H), of 1.3 or less and from 2 to 10% by weight of liquid polyisobutylene or liquid polybutadiene, said non-tacky surface layer having a thickness of from about 5 to 30% of the total thickness.
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