Impact modification of filled thermoplastics
AssigneeThe Dow Chemical Company
InventorsStephen R. Betso, Martin J. Guest
Life of this patent
Estimating the term…
Abstract
Filled compositions having good low temperature impact performance made from a thermoplastic (e.g., a polyolefin such as polypropylene) and either at least one linear ethylene/C.sub.5 -C.sub.20 .alpha.-olefin or at least one substantially linear ethylene/C.sub.3 -C.sub.20 .alpha.-olefin polymer are disclosed. The compositions are easily molded and have particular utility in making automotive facia, parts and other household articles.
Claims21
A thermoplastic olefinic polymer composition having good low temperature impact performance comprising:
- (A) a polyolefin,
- (B) at least one substantially linear interpolymer of ethylene with at least one C.sub.3 -C.sub.20 .alpha.-olefin, wherein the substantially linear interpolymer is characterized as having:
- a) a melt flow ratio, I.sub.10 /I.sub.2,.gtoreq.5.63,
- b) a molecular weight distribution, M.sub.w /M.sub.n, defined by the equation:
- M.sub.w /M.sub.n .ltoreq.(I.sub.10 /I.sub.2)-4.63, and
- c) a critical shear rate at onset of surface melt fracture of at least 50 percent greater than the critical shear rate at the onset of surface melt fracture of a linear ethylene/a-olefin polymer having about the same I.sub.2 and M.sub.w /M.sub.n,
- (C) from about 0.1% to about 80% of at least one filler.
A thermoplastic olefinic polymer composition having good low temperature impact performance comprising:
- (A) a polyolefin,
- (B) at least one substantially linear interpolymer of ethylene with at least one C.sub.3 -C.sub.20 .alpha.-olefin, wherein the substantially linear interpolymer is characterized as having:
- a) a melt flow ratio, I.sub.10 /I.sub.2,.gtoreq.5.63,
- b) a molecular weight distribution, M.sub.w /M.sub.n, defined by the equation:
- M.sub.w /M.sub.n .ltoreq.(I.sub.10 /I.sub.2)-4.63, and
- c) a processing index less than or equal to about 70 percent of the PI of a linear ethylene/a-olefin polymer having about the same I.sub.2 and M.sub.w /M.sub.n, and
- (C) from about 0.1% to about 80% of at least one filler.
A thermoplastic olefinic polymer composition having good low temperature impact performance comprising:
- (A) a polyolefin,
- (B) at least one substantially linear interpolymer of ethylene with at least one C.sub.3 -C.sub.20 .alpha.-olefin, wherein the substantially linear interpolymer is characterized as having:
- a) a melt flow ratio, I.sub.10 /I.sub.2,.gtoreq.5.63, and
- b) a molecular weight distribution, M.sub.w /M.sub.n, from about 1.5 to about 2.5, and
- (C) from about 0.1% to about 80% of at least one filler.
A thermoplastic olefinic polymer composition having an impact performance of at least about 3.6 kJ/m.sup.2 at a temperature of -30.degree. C. comprising:
- (A) a thermoplastic selected from the group consisting of thermoplastic polyurethanes, polyvinyl chlorides, styrenics, engineering thermoplastics, and polyolefins,
- (B) about 20 percent by weight of at least one substantially linear interpolymer of ethylene with at least one C.sub.3 -C.sub.20 .alpha.-olefin, wherein the substantially linear interpolymer is characterized as having:
- a) a melt flow ratio, I.sub.10 /I.sub.2,.gtoreq.5.63,
- b) a molecular weight distribution, M.sub.w /M.sub.n, defined by the equation:
- M.sub.w /M.sub.n .ltoreq.(I.sub.10 /I.sub.2)-4.63, and
- c) a critical shear rate at onset of surface melt fracture of at least 50 percent greater than the critical shear rate at the onset of surface melt fracture of a linear ethylene/a-olefin polymer having about the same I.sub.2 and M.sub.w /M.sub.n, and
- (C) from about 0.1% to about 80% of at least one filler.
A thermoplastic olefinic polymer composition having an impact performance of at least about 3.6 kJ/m.sup.2 at a temperature of -30.degree. C. comprising:
- (A) a thermoplastic selected from the group consisting of thermoplastic polyurethanes, polyvinyl chlorides, styrenics, engineering thermoplastics, and polyolefins,
- (B) about 20 percent by weight of at least one substantially linear interpolymer of ethylene with at least one C.sub.3 -C.sub.20 .alpha.-olefin, wherein the substantially linear interpolymer is characterized as having:
- a) a melt flow ratio, I.sub.10 /I.sub.2,.gtoreq.5.63,
- b) a molecular weight distribution, M.sub.w /M.sub.n, defined by the equation:
- M.sub.w /M.sub.n .ltoreq.(I.sub.10 /I.sub.2)-4.63, and
- c) a processing index less than or equal to about 70 percent of the PI of a linear ethylene/a-olefin polymer having about the same I.sub.2 and M.sub.w /M.sub.n,
- (C) from about 0.1% to about 80% of at least one filler.
A thermoplastic olefinic polymer composition having an impact performance of at least about 3.6 kJ/m.sup.2 at a temperature of -30.degree. C. comprising:
- (A) a thermoplastic selected from the group consisting of thermoplastic polyurethanes, polyvinyl chlorides, styrenics, engineering thermoplastics, and polyolefins,
- (B) about 20 percent by weight of at least one substantially linear interpolymer of ethylene with at least one C.sub.3 -C.sub.20 .alpha.-olefin, wherein the substantially linear interpolymer is characterized as having:
- a) a melt flow ratio, I.sub.10 /I.sub.2,.gtoreq.5.63, and
- b) a molecular weight distribution, M.sub.w /M.sub.n, from about 1.5 to about 2.5, and
- (C) from about 0.1% to about 80% of at least one filler.
Dependencies are inferred from the claim text.