Calendered films of plasticized blends of plastomer and impact copolymer
AssigneeExxonMobil Chemical Patents Inc.
InventorsMun F. Tse, Bryan R. Chapman, David B. Dunaway, Bruce R. Lundmark, Bruce A. Harrington
Life of this patent
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Abstract
This invention relates to a film or sheet and a process to make a film or sheet having a thickness of 0.5 to 35 mils comprising a blend composition comprising: a) 4 to 50 wt % of one or more polypropylene-based TPO(s); and b) 30 to 80 wt % of one or more ethylene plastomer(s); and c) 0.5 to 35 wt % of one or more non-functionalized plasticizer(s) having a kinematic viscosity at 100° C. of 4 to 300 cSt, a pour point of −20° C. or less, and a flash point of 200° C. or more; and d) 0 to 69.5 wt % of one or more filler(s); and wherein the blend composition is calendered into a film or sheet.
Claims25
A film having a thickness of from 0.5 to 35 mils (12.7 to 889 microns) comprising a blend composition comprising:
- a) 4 to 50 wt %, based upon the weight of the composition, of one or more polypropylene-based TPO(s) comprising at least 50 wt % propylene and at least 10 wt % ethylene having a melt flow rate (MFR) of 7 dg/min or less, a Tm of 150° C. or more, and a lowest Tg of −30° C. or less;
- and
- b) 30 to 80 wt %, based upon the weight of the composition, of one or more ethylene plastomer(s) having a melt index of 3 dg/min or less and a density of 0.869 to 0.910 g/cc;
- and
- c) 0.5 to 35 wt %, based upon the weight of the composition, of one or more non-functionalized plasticizer(s) having a kinematic viscosity at 100° C. of 4 to 300 cSt, a pour point of −20° C. or less, and a flash point of 200° C. or more;
- and
- d) 0 to 69.5 wt %, based upon the weight of the composition, of one or more filler(s);
- said blend composition having:
- i) a tensile strength of 7 MPa or more, and
- ii) an elongation at break in the machine and transverse directions of 400% or more, and
- iii) a flexural modulus of 50 MPa or less, and
- iv) Vicat softening point of 50° C. or more, and
- v) a highest Tm of 145° C. or more, and
- vi) a Roll Change Point of 5 to less than 29 mils (127 to 737 microns);
- and
- wherein the blend composition is calendered into a film having a thickness of 0.5 to 35 mils (12.7 to 889 microns).
A process to make a film or sheet having a thickness of from 0.5 to 35 mils (12.7 to 889 microns) comprising:
- 1) combining:
- a) 4 to 50 wt %, based upon the weight of the composition, of a polypropylene-based TPO comprising at least 50 wt % propylene and at least 10 wt % ethylene, having an MFR of 10 dg/min or less, a Tm of 150° C. or more, and a lowest Tg of −30° C. or less;
- and
- b) 30 to 80 wt %, based upon the weight of the composition, of an ethylene plastomer having a melt index of 3 dg/min or less and a density of 0.860 to 0.91 g/cc;
- and
- c) 0.25 to 35 wt %, based upon the weight of the composition, of one or more non-functionalized plasticizer(s) having a kinematic viscosity at 100° C. of 4 to 300 cSt, a pour point of −20° C. or less, and a flash point of 200° C. or more;
- and
- d) 0 to 69.5 wt %, based upon the weight of the composition, of one or more filler(s);
- to form a blend;
- and
- 2) calendering the blend between at least two calendering rolls at a temperature of 80° C. to 220° C., said rolls having a nip distance of about 1 to about 50 mils (25.4 to 1270 microns) where the blend has:
- i) a tensile strength (Machine Direction) of 7 MPa or more;
- and
- ii) an elongation at break (Transverse and/or Machine Direction) of 400% or more;
- and
- iii) a flexural modulus of 50 MPa or less;
- and
- iv) a Vicat softening temperature of 50° C. or more;
- and
- v) a highest Tm of 145° C. or more;
- and
- vi) a Roll Change Point of 5 to less than 29 mils (127 to 737 microns);
- and
- 3) wherein the blend composition is calendered into a film or sheet having a thickness of 0.5 to 35 mils (12.7 to 889 microns).
Dependencies are inferred from the claim text.