Filled, low gloss, TPO compositions as substitutes for polycarbonate-abs blends
AssigneeDow Global Technologies LLC
InventorHenry G. Heck
Life of this patent
Estimating the term…
Abstract
Compositions comprising (i) a crystalline, isotactic propylene homopolymer, (ii) an ethylene/α-olefin elastomeric impact modifier, and (iii) a reinforcing grade of filler, for example, talc. The crystalline isotactic propylene homopolymer has a flex modulus of greater than about 1930 MPa and a heat deflection temperature (HDT) of greater than about 100° C.; the ethylene/α-olefin interpolymer has a Tg of less than about −30° C., and a tan delta measured at 0.1 radians/s at 190° C. of less than about 2; and the filler has a HDT reinforcing efficiency of at least about 2. The composition has an HDT of greater than about 100° C. and a flex modulus of greater than about 1930 MPa.
Claims21
A polyolefin composition having a heat deflection temperature (HDT) of greater than about 120° C. and flexural modulus of greater than about 1930 MPa, the composition comprising:
- A) a crystalline isotactic propylene homopolymer having a flex modulus of greater than about 1930 MPa and an HDT of greater than about 100° C.;
- B) an ethylene/α-olefin interpolymer having Tg of less than about −30° C., a tan delta measured at 0.1 radians/s at 190° C. of less than about 2, an HDT that is greater than the peak melting temperature of the ethylene/α-olefin interpolymer, measured by differential scanning calorimetry, and
- C) A platy filler, and
- wherein the weight ratio of homopolymer:interpolymer (A:B) is between about 9:1 and about 6:4, and
- wherein the filler has an HDT efficiency factor greater than, or equal to, about 1.5, and a flexural modulus efficiency factor greater than about 3, and wherein each efficiency factor is determined by measuring the effect of a “20 weight percent addition of filler” on the respective HDT or flexural modulus of a blend of the crystalline isotactic propylene homopolymer and the ethylene/α-olefin interpolymer.
Dependencies are inferred from the claim text.