Highly filled polymer compositions
View Patent ↗This invention pertains to highly filled polymer compositions comprising a low molecular weight ethylene and/or alpha olefin homopolymers and copolymers, or blends therefrom, filled with high concentrations of fillers or additives. Examples of such fillers or additives include fire retardants, talc, ceramic manufacturing agents, color concentrates, crosslinking agents, and blowing agents. Because of the low crystallinity (and therefore high percentage of amorphous phase) and low viscosities of the base polymers, highly processable compositions can be formed containing even if containing relatively high loadings of fillers or additives. Such highly filled compositions are thus ideally suited as concentrates or masterbatch formulations for a variety of different compounding applications.
1. A composition comprising a blend of Component A), Component B) and at least one organic additive;
A) one or more inorganic fillers, present in an amount greater than, or equal to, 40 percent by weight (based on the combined weights of Component A and B); and
B) one or more base polymers present in an amount less than 60 percent by weight (based on the combined weights of Component A and B); and
wherein said one or more base polymers are selected from polypropylene homopolymers, propylene/ethylene copolymers or propylene/C4-C20 alpha-olefin copolymers, and have
1) a total crystallinity from 0 to 30 percent; and
2) a Brookfield viscosity from 500 to 50,000 cP, measured at 350° F. (177° C.), and
wherein the one or more base polymers (Component B) have a density from 0.865 g/cm 3 to 0.885 g/cm 3 .
2. The composition of claim 1 , wherein the one or more base polymers are selected from propylene/ethylene copolymers.
3. The composition of claim 1 , wherein the one or more base polymers are selected from propylene/C4-C20 alpha-olefin copolymers.
4. The composition of claim 1 , wherein
A) Component A is selected from the group consisting of glass fibers, talc, calcium carbonate, alumina trihydrate, marble dust, cement dust, clay, feldspar, silica or glass, fumed silica, alumina, magnesium oxide, magnesium hydroxide, antimony oxide, zinc oxide, barium sulfate, aluminum silicate, calcium silicate, titanium dioxide, titanates, glass microspheres, chalk, and combinations thereof.
5. An article comprising at least one component formed from the composition of claim 1 .
6. An article comprising at least one component formed from the composition of claim 2 .
7. An article comprising at least one component formed from the composition of claim 3 .
8. A multilayered structure comprising at least one layer formed from the composition of claim 1 .
9. A multilayered structure comprising at least one layer formed from the composition of claim 2 .
10. A multilayered structure comprising at least one layer formed from the composition of claim 3 .
11. A film or sheet formed from the composition of claim 1 .
12. A film or sheet formed from the composition of claim 1 .
13. A film or sheet formed from the composition of claim 3 .
14. An injection molded or blow molded part formed from the composition of claim 1 .
15. An injection molded or blow molded part formed from the composition of claim 1 .
16. An injection molded or blow molded part formed from the composition of claim 3 .