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US 11,377,514 B2Granted
Combined seals, compositions, and methods of making the same
AssigneeCooper-Standard Automotive Inc.
InventorsKrishnamachari Gopalan, Robert J. Lenhart, Gending Ji, Roland Herd-Smith
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Abstract
A combined sealing member is provided that includes a composition comprising two or more polyolefin elastomers selected from the group consisting of a dense, a micro-dense and a dynamic silane-crosslinked polyolefin elastomer having a respective density of less than 0.90 g/cm3, less than 0.70 g/cm3, and less than 0.60 g/cm3. The combined sealing member exhibits a compression set of from about 5.0% to about 35.0%, as measured according to ASTM D 395 (22 hrs @ 70° C.).
Claims18
A combined sealing member comprising:
- a composition comprising two or more polyolefin elastomers selected from the group consisting of
- a dense silane-crosslinked polyolefin elastomer having a density of less than 0.90 g/cm3, a tensile strength ranging from 10.4 to about 14.5 MPa as measured according to ASTM D412, a Shore A hardness ranging from about 76 to about 88 as measured according to ASTM D412, and a crystallinity of from about 5% to about 15%, wherein from about 1 wt % to about 20 wt % of the dense silane-crosslinked polyolefin elastomer is a polypropylene filler having a crystallinity greater than 40%,
- a microdense silane-crosslinked polyolefin elastomer having a density of less than 0.70 g/cm3, a tensile strength ranging from about 5.0 to about 8.7 MPa as measured according to ASTM D412, a Shore A hardness ranging from 60 to 87 as measured according to ASTM D412, and a crystallinity of from about 5% to about 15%, wherein from about 1 wt % to about 20 wt % of the microdense silane-crosslinked polyolefin elastomer is a polypropylene filler having a crystallinity greater than 40%, and
- a dynamic silane-crosslinked polyolefin elastomer having a density of less than 0.60 g/cm3, a tensile strength ranging from about 2.0 to about 2.9 MPa as measured according to ASTM D412 and a crystallinity of from about 5% to about 15%,
- wherein the polyolefin elastomers do not display a Mullins effect or a Payne effect,
- wherein the combined sealing member and the foamed silane-crosslinked polyolefin elastomers are thermosets, and
- wherein the combined sealing member exhibits a compression set of from about 5.0% to about 35.0%, as measured according to ASTM D 395 (22 hrs @ 70° C.).
4 more elements
A combined sealing member comprising:
- comprising a first and a second polyolefin elastomer,
- wherein the first elastomer comprises a microdense silane-crosslinked polyolefin elastomer having a density of less than 0.70 g/cm3, a tensile strength ranging from about 5.0 to about 8.7 MPa as measured according to ASTM D412, and a Shore A hardness ranging from 60 to 87 as measured according to ASTM D412, and a crystallinity of from about 5% to about 15%, wherein from about 1 wt % to about 20 wt % of the microdense silane-crosslinked polyolefin elastomer is a polypropylene filler having a crystallinity greater than 40%, and
- wherein the second elastomer comprises
- a dense silane-crosslinked polyolefin elastomer having a density of less than 0.90 g/cm3, a tensile strength ranging from 10.4 to about 14.5 MPa as measured according to ASTM D412, a Shore A hardness ranging from about 76 to about 88 as measured according to ASTM D412, and a crystallinity of from about 5% to about 15%, wherein from about 1 wt % to about 20 wt % of the dense silane-crosslinked polyolefin elastomer is a polypropylene filler having a crystallinity greater than 40%, or
- a dynamic silane-crosslinked polyolefin elastomer having a density of less than 0.60 g/cm3, a tensile strength ranging from about 2.0 to about 2.9 MPa as measured according to ASTM D412, and a crystallinity of from about 5% to about 15%,
- wherein the polyolefin elastomers do not display a Mullins effect or a Payne effect,
- wherein the combined sealing member and the foamed silane-crosslinked polyolefin elastomers are thermosets, and
- wherein the combined sealing member exhibits a compression set of from about 5.0% to about 35.0%, as measured according to ASTM D 395 (22 hrs @ 70° C.).
5 more elements
A combined sealing member comprising:
- a dense silane-crosslinked polyolefin elastomer having a density of less than 0.90 g/cm3, a tensile strength ranging from 10.4 to about 14.5 MPa as measured according to ASTM D412, a Shore A hardness ranging from about 76 to about 88 as measured according to ASTM D412, and a crystallinity of from about 5% to about 15%, wherein from about 1 wt % to about 20 wt % of the dense silane-crosslinked polyolefin elastomer is a polypropylene filler having a crystallinity greater than 40%, and
- a dynamic silane-crosslinked polyolefin elastomer having a density of less than 0.60 g/cm3, a tensile strength ranging from about 2.0 to about 2.9 MPa as measured according to ASTM D412 and a crystallinity of from about 5% to about 15%,
- wherein the polyolefin elastomers do not display a Mullins effect or a Payne effect,
- wherein the combined sealing member and the foamed silane-crosslinked polyolefin elastomers are thermosets, and
- wherein the combined sealing member exhibits a compression set of from about 5.0% to about 35.0%, as measured according to ASTM D 395 (22 hrs @ 70° C.).
2 more elements
Dependencies are inferred from the claim text.