Sound-deadening filled thermoplastic polyolefin composition
AssigneeDow Global Technologies LLC
InventorsJames T. Seliskar, James D. Oelberg, Tariq S. Oweimreen, Paul M. Sowers, Thomas Karcz
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Abstract
The present invention relates to filled thermoplastic polyolefin compositions useful e.g., as sound-deadening sheeting for formed automotive applications comprising a propylene polymer having a density equal to or greater than 0.885 g/cm3, one or more linear ethylene polymer and/or substantially linear polymer, a plasticizer, and a filler, preferably calcium carbonate. Said composition demonstrates a good balance of heat properties and stiffness such that it is particularly suitable for sheet extrusion and thermoforming articles therefrom.
Claims8
A filled thermoplastic polyolefin composition consisting of:
- (i) from about 1 to about 15 parts by weight of a propylene polymer having a density equal to or greater than 0.885 g/cm3, wherein the propylene polymer is a copolymer consisting of propylene and ethylene;
- (ii) from about 10 to about 30 parts by weight of one or more linear ethylene polymer, one or more substantially linear ethylene polymer, or mixtures thereof characterized as having
- (ii.a) a density equal to or greater than 0.873 g/cc and equal to or less than 0.885 g/cc and
- (ii.b) an I2 of from greater than 1 g/10 min to less than 5 g/10 min;
- wherein the linear ethylene polymer is prepared by using a metallocene or vanadium based catalyst and the substantially linear ethylene polymer is prepared by using a metallocene based catalyst;
- (iii) from about 2 to about 7 parts by weight of plasticizer;
- (iv) from about 60 to about 85 parts by weight of particulate filler;
- and
- (v) optionally one or more of a slip agent, an ignition resistant additive, a stabilizer, a colorant, a pigment, an antioxidant, an antistat, a flow enhancer, a mold release, or a nucleating agent;
- wherein parts by weight is based on the total weight of the thermoplastic polyolefin composite.
A process to make a thermoformed article comprising the steps of
- (A) extruding a sheet comprising a filled thermoplastic polyolefin composition consisting of
- (i) from 1 to 15 parts by weight of a random propylene copolymer consisting of propylene and ethylene;
- (ii) from 10 to 30 parts by weight of one or more linear ethylene polymer, one or more substantially linear ethylene polymer, or mixtures thereof characterized as having
- (ii.a) a density equal to or greater than 0.873 g/cc and equal to or less than 0.885 g/cc and
- (ii.b) an I2 of from greater than 1 g/10 min to less than 5 g/10 min
- wherein the linear ethylene polymer is prepared by using a metallocene or vanadium based catalyst and the substantially linear ethylene polymer is prepared by using a metallocene based catalyst;
- (iii) from 60 to 80 parts by weight of a filler;
- (iv) from 3 to 7 parts by weight of a plasticizer;
- and
- (v) optionally one or more of a slip agent, an ignition resistant additive, a stabilizer, a colorant, a pigment, an antioxidant, an antistat, a flow enhancer, a mold release, or a nucleating agent, wherein parts by weight are based on the total weight of the filled thermoplastic polyolefin composition
- and
- (B) thermoforming said sheet into a thermoformed article.
Dependencies are inferred from the claim text.