US5059631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extruded ethylenic polymer foam containing both open and closed cells
Assignee: Applied Extrusion Technologies Inc
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Filing: 1990-05-22
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Granted: 1991-10-22
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Expires: 2010-05-22
Abstract
Abstract Disclosed is an extruded, low density, non-outgassing ethylenic polymer foam containing 30-85% open cells and the remainder closed cells and having an essentially integral surface. The foam possesses superior compression recovery and lower compression resistance when compared with similarly comprised ethylenic closed cell foams and superior moisture resistance and handling characteristics when compared to open cell foams.
Inventors
- 👤 Edward E. Hovis
- 👤 Eric D. Johnson
- 👤 Michael J. Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:59
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J9/34; C08J2323/00; C08J2323/02; C08J2423/00; Y; Y10; Y10S; Y10S264/00; Y10S264/18; Y10S521/00; Y10S521/908; Y10S521/909; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249976; Y10T428/249977; Y10T428/249987; Y10T428/249988; Y10T428/249989; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
122 words
A method of producing a polymeric foam comprising the steps of feeding an ethylenic polymer material selected from the group consisting of polyethylene, soft ethylenic copolymers and blends thereof to an extruder, and extruding the material in a foam form having a cross-section of from about 0.20 in 2 to about 40 in 2 , a density of from about 1.5 lb./ft 3 to about 10 lb./ft 3 , a compression resistance of 10 psi or less at 50% compression, where the foam contains from about 30% to about 85% open cells and the remainder closed cells, an integral skin covering the foam, and the foam is non-outgassing as determined by ASTM C24.32.13 (Task Group 13) Proposed Test Method for Determining Outgassing.
Claim 2
Independent Claim
122 words
A method of producing a polymeric foam comprising the steps of feeding an ethylenic polymer material selected from the group consisting of polyethylene, soft ethylenic copolymers and blends thereof to an extruder, and extruding the material in a foam form having a cross-section of from about 0.20 in 2 to about 40 in 2 , a density of from about 1.5 lb./ft 3 to about 10 lb./ft 3 , a compression resistance of 10 psi or less at 50% compression, where the foam contains from about 30% to about 85% open cells and the remainder closed cells, an integral skin covering the foam, and the foam is non-outgassing as determined by ASTM C24.32.13 (Task Group 13) Proposed Test Method for Determining Outgassing.
Claim 3
Dependent Claim
36 words
A method as in claim 1, where the ethylenic polymer is low density polyethylene, a soft ethylene copolymer having a secant modulus of less than 15,000, when measured by ASTM method D-882, or a blend thereof.
Claim 4
Dependent Claim
15 words
A method as in claim 2, where the soft ethylene copolymer is ethylene vinyl acetate.
Claim 5
Dependent Claim
32 words
A method as in claim 2, where the ethylenic polymer is a blend of from about 85% to about 10% low density polyethylene and about 15% to about 90% ethylene vinyl acetate.
Claim 6
Dependent Claim
25 words
A method as in claim 2, where the ethylenic polymer is a blend of about 50% low density polyethylene and about 50% ethylene vinyl acetate.
Claim 7
Dependent Claim
33 words
A method as in claim 1, where the foam is in the shape of a rod having an essentially circular cross section with a diameter of from about 0.25 to about 3.5 inches.
Claim 8
Dependent Claim
36 words
A method as in claim 6, where the ethylenic polymer is low density polyethylene, a soft ethylene copolymer having a secant modulus of less than 15,000, when measured by ASTM method D-882, or a blend thereof.
Claim 9
Dependent Claim
15 words
A method as in claim 7, where the soft ethylene copolymer is ethylene vinyl acetate.
Claim 10
Dependent Claim
32 words
A method as in claim 7, where the ethylenic polymer is a blend of from about 85% to about 10% low density polyethylene and about 15% to about 90% ethylene vinyl acetate.
Claim 11
Dependent Claim
25 words
A method as in claim 7, where the ethylenic polymer is a blend of about 50% low density polyethylene and about 50% ethylene vinyl acetate.
Claim 12
Dependent Claim
47 words
A method as in claim 7, where the ethylenic polymer is a blend of from, about 25% to about 75% low density polyethylene and afrom about 25% to about 75% ethylene vinyl acetate and where the polymer foam has a density about 1.5 lb/ft to 3.5 lb/ft.
Claim 13
Dependent Claim
33 words
A method as in claim 1, where the ethylenic polymer is comprised of a blend of low density polyethylene, a silane modified cross-linkable ethylene copolymer and a cross-linking catalyst for the cross-linkable copolymer.
Claim 14
Dependent Claim
16 words
A method as in claim 1, where the compression resistance is no greater than 8.5 psi.
Claim 15
Dependent Claim
39 words
A method as in claim 13, where the compression resistance is in the range of 2-7 psi, the open cell content is in the range of 40-85%, and the density is in the range of 1.9-10 lb/ft 3 .
Claim 16
Dependent Claim
39 words
A method as in claim 14, where the compression resistance is in the range of 3-6 psi, the open cell content is in the range of 60-80%, and the density is in the range of 2-5 lb/ft 3 .
Claim 17
Dependent Claim
29 words
A method as in claim 15, where the compression resistance is in the range of 3-5 psi, and the density is in the range of 2.3-3.5 lb/ft 3 .
Claim 18
Dependent Claim
23 words
A method as in claim 16, where the open cell content is about 63.5%, and the density is about 2.5 lb/ft 3 .
Claim 19
Dependent Claim
14 words
A method as in claim 1, where the open cell content is about 63.5%.
References Cited (Backward Citations)
US4387169A
Cited
US4931484A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-21 | 1995-04-22 | 1995-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-21 | 1999-04-22 | 1999-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-21 | 2003-04-22 | 2003-10-22 | $7700.00 | Window Closed / Lapsed |