Expanded bead foams from propylene-diene copolymers and their use
OwnerAspy Mehta, Pawan Agarwalinventors
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Abstract
Disclosed herein is an expanded olefin resin comprising a copolymer base resin and a blowing agent, wherein the copolymer base resin is comprised of about 90 to 99.999 weight percent of an olefin and about 0.001 to 10 weight percent of an α-ω diene, wherein the copolymer base resin has a weight average molecular weight of about 30,000 to 500,000 Daltons, a crystallization temperature in a range from 115° C. to 135° C., and a melt flow rate in a range from 0.1 dg/min to 100 dg/min as determined using ASTM D-1238 at 230° C. and 2.16 kg load.
Claims18
An expanded olefin resin comprising:
- a copolymer base resin and a blowing agent,
- the copolymer base resin comprising about 99.95 to 99.999 weight percent of an olefin and about 0.001 to 0.05 weight percent of an α-ω diene, wherein the copolymer base resin has a weight average molecular weight of about 30,000 to 500,000 Daltons, a crystallization temperature of about 115° C. to 135° C., and a melt flow rate of about 0.1 dg/min to 100 dg/min as determined using ASTM D-1238 at 230° C. and 2.16 kg load.
A process to produce an expanded olefin resin, comprising:
- contacting a copolymer base resin with a blowing agent under a pressure greater than or equal to atmospheric pressure,
- heating the copolymer base resin and the blowing agent to a temperature greater than or equal to the softening point of the olefin copolymer base resin, to produce an expanded olefin resin,
- wherein copolymer base resin comprises about 99.95 to 99.999 weight percent of an olefin, and about 0.001 to 0.05 weight percent of an α-ω diene, and
- wherein the copolymer base resin has a weight average molecular weight of about 30,000 to 500,000 Daltons, a crystallization temperature in a range from 115° C. to 135° C., and a melt flow rate in a range from 0.1 dg/min to 100 dg/min as determined using ASTM D-1238 at 230° C. and 2.16 kg load.
A foamed article comprising a foamed expanded olefin resin, wherein prior to foaming, the expanded olefin resin comprises a copolymer base resin and a blowing agent, wherein the copolymer base resin comprises about 99.95 to 99.999 weight percent of an olefin and about 0.001 to 0.05 wt % of an α-ω diene, wherein the copolymer base resin has a weight average molecular weight of about 30,000 to 500,000 Daltons, a crystallization temperature in a range from 115° C. to 135° C., and a melt flow rate in a range from 0.1 dg/min to 100 dg/min, as determined using ASTM D-1238 at 230° C. and 2.16 kg load, and wherein the foamed article has a bulk density of about 0.001 g/ml to about 0.8 g/ml.
Dependencies are inferred from the claim text.