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US 10,538,655 B2Granted
Bamboo fibers reinforced polypropylene compositions
AssigneeTotal Research & Technology Feluy
InventorsGabriel Desille, Caroline Schils
Life of this patent
Estimating the term…
Abstract
A bamboo fibers reinforced polypropylene composition may include at least 50 wt % of a heterophasic propylene copolymer; from 2 to 40 wt % of bamboo fibers; and from 0.1 to 10 wt % of a coupling agent. The composition may show a melt flow index that is at least 5 g/10 min at 190° C. under a load of 2.16 kg according to ISO 1133, condition L; a density that is in the range of 0.900 and 1.010 g/cm3 according to ISO 1183; and a flexural modulus is in the range of 1100 MPa and 4000 MPa according to ISO 178. The composition may be prepared by mixing and kneading, and may be used to form articles.
Claims19
A composition comprising:
- a) at least 50 weight percent (wt %) relative to a total weight of the composition of a heterophasic propylene copolymer, wherein the heterophasic propylene copolymer has a melt flow index measured at 230° C. under a load of 2.16 kg according to ISO 1133, condition L, of at least 15 g/10 min, and is a product of a polymer blend comprising from 50 to 98 wt % of a first polymer and from 2 to 50 wt % of a second polymer, wherein the first polymer is a first heterophasic propylene copolymer having a melt flow index measured at 230° C. under a load of 2.16 kg according to ISO 1133, condition L, in a range of from 5 to 25 g/10 min, and wherein the second polymer is a second heterophasic propylene copolymer having a melt flow index measured at 230° C. under a load of 2.16 kg according to ISO 1133, condition L, of greater than 25 g/10 min;
- b) from 2 to 40 wt % relative to the total weight of the composition of bamboo fibers, wherein the bamboo fibers have an average length in a range of from 1000 μm to 1500 μm;
- c) from 0.1 to 10 wt % relative to the total weight of the composition of a coupling agent;
- and
- d) from 0 to 30 wt % relative to the total weight of the composition of an inorganic filler;
- wherein the composition exhibits the following properties:
- a melt flow index that is at least 5 g/10 min at 190° C. under a load of 2.16 kg according to ISO 1133, condition L;
- a density that is in the range of 0.900 and 1.010 g/cm3 according to ISO 1183;
- a flexural modulus that is in the range of 1100 MPa and 4000 MPa according to ISO 178;
- and
- a charpy impact strength notched of the composition at 23° C. according to ISO 179 of at least 3 kJ/m2.
8 more elements
A method of forming a composition, the method comprising:
- introducing a heterophasic polypropylene copolymer and a coupling agent into an extruder through a first feed port to form a mixture, wherein the heterophasic polypropylene copolymer has a melt flow index measured at 230° C. under a load of 2.16 kg according to ISO 1133, condition L, of at least 15 g/10 min, and is a product of a polymer blend comprising from 50 to 98 wt % of a first polymer and from 2 to 50 wt % of a second polymer, wherein the first polymer is a first heterophasic propylene copolymer having a melt flow index measured at 230° C. under a load of 2.16 kg according to ISO 1133, condition L, in a range of from 5 to 25 g/10 min, and wherein the second polymer is a second heterophasic propylene copolymer having a melt flow index measured at 230° C. under a load of 2.16 kg according to ISO 1133, condition L, of greater than 25 g/10 min;
- mixing the mixture to a molten state;
- kneading the molten mixture with bamboo fibers and optionally an inorganic filler, wherein the bamboo fibers have an average length in a range of from 1000 μm to 1500 μm, wherein the bamboo fibers and the optional inorganic filler are introduced into the extruder through a second feed port located downstream of the first feed port.
A method comprising:
- producing a molded article from a composition;
- wherein the composition comprises:
- at least 50 weight percent (wt %) relative to a total weight of the composition of a heterophasic propylene copolymer, wherein the heterophasic propylene copolymer has a melt flow index measured at 230° C. under a load of 2.16 kg according to ISO 1133, condition L, of at least 15 g/10 min, and is a product of a polymer blend comprising from 50 to 98 wt % of a first polymer and from 2 to 50 wt % of a second polymer, wherein the first polymer is a first heterophasic propylene copolymer having a melt flow index measured at 230° C. under a load of 2.16 kg according to ISO 1133, condition L, in a range of from 5 to 25 g/10 min, and wherein the second polymer is a second heterophasic propylene copolymer having a melt flow index measured at 230° C. under a load of 2.16 kg according to ISO 1133, condition L, of greater than 25 g/10 min;
- from 2 to 40 wt % relative to the total weight of the composition of bamboo fibers, wherein the bamboo fibers have an average length in a range of from 1000 μm to 1500 μm;
- from 0.1 to 10 wt % relative to the total weight of the composition of a coupling agent;
- and
- from 0 to 30 wt % relative to the total weight of the composition of an inorganic filler;
- and wherein the composition exhibits the following properties:
- a melt flow index that is at least 5 g/10 min at 190° C. under a load of 2.16 kg according to ISO 1133, condition L;
- a density that is in the range of 0.900 and 1.010 g/cm3 according to ISO 1183;
- a flexural modulus that is in the range of 1100 MPa and 4000 MPa according to ISO 178;
- and
- a charpy impact strength notched of the composition at 23° C. according to ISO 179 of at least 3 kJ/m2.
10 more elements
An article comprising a composition, wherein the composition comprises:
- at least 50 weight percent (wt %) relative to a total weight of the composition of a heterophasic propylene copolymer, wherein the heterophasic propylene copolymer has a melt flow index measured at 230° C. under a load of 2.16 kg according to ISO 1133, condition L, of at least 15 g/10 min, and is a product of a polymer blend comprising from 50 to 98 wt % of a first polymer and from 2 to 50 wt % of a second polymer, wherein the first polymer is a first heterophasic propylene copolymer having a melt flow index measured at 230° C. under a load of 2.16 kg according to ISO 1133, condition L, in a range of from 5 to 25 g/10 min, and wherein the second polymer is a second heterophasic propylene copolymer having a melt flow index measured at 230° C. under a load of 2.16 kg according to ISO 1133, condition L, of greater than 25 g/10 min;
- from 2 to 17 wt % relative to the total weight of the composition of bamboo fibers, wherein the bamboo fibers have an average length in a range of from 1000 μm to 1500 μm;
- from 0.1 to 10 wt % relative to the total weight of the composition of a coupling agent;
- and
- from 0 to 30 wt % relative to the total weight of the composition of an inorganic filler;
- and wherein the composition exhibits the following properties:
- a melt flow index that is at least 5 g/10 min at 190° C. under a load of 2.16 kg according to ISO 1133, condition L;
- a density that is in the range of 0.900 and 1.010 g/cm3 according to ISO 1183;
- a flexural modulus that is in the range of 1100 MPa and 4000 MPa according to ISO 178;
- and
- a charpy impact strength notched of the composition at 23° C. according to ISO 179 of at least 8 kJ/m2.
8 more elements
Dependencies are inferred from the claim text.