Elastic polypropylene-based film compositions
AssigneeExxonMobil Chemical Patents Inc.
InventorHans J. Pip
Life of this patent
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Abstract
Disclosed in part is a composition comprising one or more propylene-α-olefin copolymer(s) comprising propylene-derived units and from 5 to 35 wt % (by weight of the propylene-α-olefin copolymer) of ethylene-derived units and/or C4 to C10 α-olefin-derived units, and having a Mooney viscosity [ML (1+4) @ 125° C.] as determined according to ASTM D1646, of less than 50, and a Hf of less than 75 J/g; and one or more ethylene-ester copolymer(s). The composition is suitable for an elastic film, and in particular suitable for a two or more layered film wherein the skin (outer) layer also includes anti-block and slip agents.
Claims23
A film comprising a composition comprising
- (a) one or more propylene-α-olefin copolymer(s) comprising propylene-derived units and from 5 to 35 wt % (by weight of the propylene-α-olefin copolymer) of ethylene-derived units and/or C4 to C10 α-olefin-derived units, and having a Mooney viscosity [ML (1+4) @ 125° C.] as determined according to ASTM D1646, of less than 50, a Hf of less than 75 J/g, and a triad tacticity of three propylene units of at least 75%;
- and
- (b) one or more ethylene-ester copolymer(s).
A film comprising one or more skin layer and a middle layer, wherein:
- (a) the one or more skin layer comprises:
- (i) propylene-α-olefin copolymer(s) comprising propylene-derived units and from 5 to 35 wt % (by weight of the propylene-α-olefin copolymer) of ethylene-derived units and/or C4 to C10 α-olefin-derived units, and having a Mooney viscosity [ML (1+4) @ 125° C.] as determined according to ASTM D1646, of less than 50, a Hf of less than 75 J/g, and a triad tacticity of three propylene units of at least 75%;
- (ii) one or more ethylene-ester copolymer(s);
- (iii) one or more anti-block agent(s);
- (iv) one or more slip agent(s);
- and
- (b) the middle layer comprises:
- (i) one or more propylene-α-olefin copolymer(s) comprising propylene-derived units and from 5 to 35 wt % (by weight of the propylene-α-olefin copolymer) of ethylene-derived units and/or C4 to C10 α-olefin-derived units, and having a Mooney viscosity [ML (1+4) @ 125° C.] as determined according to ASTM D1646, of less than 50, a Hf of less than 75 J/g, and a triad tacticity of three propylene units of at least 75%;
- and
- (ii) one or more ethylene-ester copolymer(s).
A process for making a film comprising:
- (a) melt blending one or more propylene-α-olefin copolymer comprising propylene-derived units and from 5 to 35 wt % (by weight of the propylene-α-olefin copolymer) of ethylene-derived units and/or C4 to C10 α-olefin-derived units, and having a Mooney viscosity [ML (1+4) @ 125° C.] as determined according to ASTM D1646, of less than 50, a Hf of less than 75 J/g, and a triad tacticity of three propylene units of at least 75%;
- and one more ethylene-ester copolymer;
- and
- (b) extruding the intimately blended melt through one or more die having one or more die gap within the range of from 0.8 to 3 mm.
Dependencies are inferred from the claim text.