Composition for polyolefin resin foam, foam of the same, and process for producing foam
AssigneeNitto Denko Corporation
InventorsMitsuhiro Kanada, Katsuhiko Tachibana
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Abstract
A composition for polyolefin resin foam, which comprises a polymer component comprising a polyolefin resin and a rubber and/or thermoplastic elastomer, and a powder particle, wherein the composition has an extensional viscosity as measured with a capillary rheometer (temperature, 200° C.; shear rate, 5,000 [1/s]) of from 20 to 100 kPa·s.
Claims6
A polyolefin resin foam obtained by subjecting a composition for polyolefin resin foam to foam molding using carbon dioxide in a supercritical state, wherein the composition comprises:
- a polymer component comprising 100 parts by weight of at least one of polyethylene and polypropylene and 10 to 150 parts by weight an elastomer having a micro-domain structure made up of an olefin ingredient and an ethylene/propylene rubber, and
- a powder particle having a particle diameter of from 0.1 to 10 μm,
- wherein the powder particle is contained in an amount of from 5 to 150 parts by weight based on 100 parts by weight of the polymer component,
- wherein the composition has an extensional viscosity as measured with a capillary rheometer (temperature, 200° C.;
- shear rate, 5,000 [1/s]) of from 20 to 100 kPa·s,
- wherein the polyolefin resin foam has a relative density in the range of from 0.02 to 0.30,
- wherein the polyolefin resin foam has a load against repulsion upon compressing to 50% (50% compression strength) of 5.0 N/cm2 or lower, and
- wherein the final thickness of the obtained foam is from 0.5 to 5.0 mm.
A process for producing a polyolef resin foam, which comprises foam-molding a composition for polyolefin resin foam which comprises:
- a polymer component comprising 100 parts by weight of at least one of polyethylene and polypropylene and 10 to 150 parts by weight an elastomer having a micro-domain structure made up of an olefin ingredient and an ethylene/propylene rubber, and
- a powder particle having a particle diameter of from 0.1 to 10 μm,
- wherein the composition has an extensional viscosity as measured with a capillary rheometer (temperature, 200° C.;
- shear rate, 5,000 [1/s]) of from 20 to 100 kPa·s,
- wherein the polyolefin resin foam has a relative density in the range of from 0.02 to 0.30,
- wherein the polyolefin resin foam has a load against repulsion upon compressing to 50% (50% compression strength) of 5.0 N/cm2 or lower, and
- wherein the final thickness of the obtained foam is from 0.5 to 5.0 mm.
Dependencies are inferred from the claim text.