Back to results
US 11,976,177 B2Granted
Polymer composition and membranes made therefrom with improved mechanical strength
AssigneeCelanese International Corporation
InventorsChristian Ohm, Fangfang Tao, Man Cheng Li
Life of this patent
Estimating the term…
Abstract
A polymer composition for producing gel extruded articles is described. The polymer composition contains polyethylene particles combined with a plasticizer and one or more strength enhancing additives. Polymer articles made in accordance with the present disclosure have enhanced strength properties. In one embodiment, the polymer composition is used to form a porous membrane for use as a separator in electronic devices.
Claims20
A polymer composition for producing gel extruded articles comprising:
- a plasticizer;
- high density polyethylene particles, wherein the high density polyethylene particles are formed from high density polyethylene polymer that has a half crystallization time period during an isothermal crystallization at 123° C. of greater than 2.5 minutes;
- and
- one or more strength enhancing agents that influences the crystalline structure of the high density polyethylene particles, the one or more strength enhancing agents comprising a metal salt of a carboxylic acid, a metal salt of a phosphate, an inorganic filler or mixtures thereof, the one or more strength enhancing agents being present in the polymer composition in an amount sufficient for a membrane made from the polymer composition to have an increase in tensile strength in at least one direction or an increase in puncture strength of greater than about 2%.
1 more element
A porous membrane comprising:
- a polymer composition comprising a high density polyethylene combined with one or more strength enhancing agents, the one or more strength enhancing agents being present in the polymer composition in an amount sufficient for a membrane made from the polymer composition to have an increase in tensile strength in at least one direction or an increase in puncture strength of greater than about 2%, the one or more strength enhancing agents comprising a metal salt of a carboxylic acid, a metal salt of a phosphate, an inorganic filler, or mixtures thereof, the porous membrane being sorbitol-free and polypropylene-free, the high density polyethylene polymer having a half crystallization time period during an isothermal crystallization at 123° C. of greater than 2 minutes.
A polymer composition for producing gel extruded articles comprising:
- a plasticizer;
- high density polyethylene particles, wherein the high density polyethylene particles are formed from a high density polyethylene polymer that has a full width at half maximum of a melting endothermic peak of greater than 6 degrees C. when measured using a differential scanning calorimeter when tested at an isothermal temperature of 40° C.;
- and
- one or more strength enhancing agents that influences the crystalline structure of the high density polyethylene particles, the one or more strength enhancing agents comprising a metal salt of a carboxylic acid, a metal salt of a phosphate, an inorganic filler or mixtures thereof, the one or more strength enhancing agents being present in the polymer composition in an amount sufficient for a membrane made from the polymer composition to have an increase in tensile strength in at least one direction or an increase in puncture strength of greater than about 2%.
1 more element
Dependencies are inferred from the claim text.