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US4801484A
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US
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Highly loaded coalesced foam
Assignee: Dow Chemical Co
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Filing: 1988-01-13
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Granted: 1989-01-31
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Expires: 2008-01-13
Abstract
Abstract Highly loaded improved closed cell foams comprising a plurality of coalesced strands or profiles of an alkenyl aromatic thermoplastic synthetic resin or mixture of an olefin polymer resin and a copolymer of ethylene with one or more copolymerizable comonomers having a lower melting point than the olefin polymer resin. The loading of the nucleating additive is in a range of about 0.5 to about 50 weight percent, based on total resin weight. When highly loaded with carbon black these foams are electroconductive foams.
Inventors
- 👤 Peter C. Yao
- 👤 Bruce A. Malone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:33
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/468; C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; B29K; B29K2023/00; B29K2025/00; B29K2105/00; B29K2105/04; B29K2105/043; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S264/18; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
158 words
A highly loaded closed cell foam structure comprising a plurality of coalesced extruded strands or profiles of a mixture comprising: (a) a thermoplastic resin selected from the group consisting of: (1) an olefin resin blend of (a) an olefin polymer selected from the group consisting of homopolymers of ethylene or propylene, copolymers of ethylene or propylene with one or more C4-8 α-olefins and mixtures thereof; and (b) an interpolymer of ethylene and at least one comonomer, said interpolymer having a melting point less than the melting point of olefin polymer (a); and (2) an alkenyl aromatic synthetic resinous material; and (b) a nucleating additive in a range of about 0.5 to about 50 percent, based on the total weight of the thermoplastic resin; provided further that the foam structure has a density from about 0.5 to about 5.0 lbs/ft 3 and the strands or profiles are disposed in substantially parallel arrangement to the longitudinal axis of the foam.
Claim 2
Dependent Claim
158 words
A highly loaded closed cell foam structure comprising a plurality of coalesced extruded strands or profiles of a mixture comprising: (a) a thermoplastic resin selected from the group consisting of: (1) an olefin resin blend of (a) an olefin polymer selected from the group consisting of homopolymers of ethylene or propylene, copolymers of ethylene or propylene with one or more C4-8 α-olefins and mixtures thereof; and (b) an interpolymer of ethylene and at least one comonomer, said interpolymer having a melting point less than the melting point of olefin polymer (a); and (2) an alkenyl aromatic synthetic resinous material; and (b) a nucleating additive in a range of about 0.5 to about 50 percent, based on the total weight of the thermoplastic resin; provided further that the foam structure has a density from about 0.5 to about 5.0 lbs/ft 3 and the strands or profiles are disposed in substantially parallel arrangement to the longitudinal axis of the foam.
Claim 3
Dependent Claim
32 words
A foam according to claim 1, wherein the foam structure has a minimal cross-sectional area of at least 12 square inches and a minimal cross-sectional dimension of at least one quarter inch.
Claim 4
Dependent Claim
32 words
A foam according to claim 1, wherein the foam structure has a minimal cross-sectional area of at least 18 square inches and a minimal cross-sectional dimension of at least one half inch.
Claim 5
Dependent Claim
13 words
A foam according to claim 1, wherein the nucleating additive is carbon black.
Claim 6
Dependent Claim
22 words
A foam according to claim 4, wherein the carbon black is present in a range of about 5 to about 50 percent.
Claim 7
Dependent Claim
19 words
A foam according to claim 1 having a density of from about 0.5 to about 3.0 lb/ft 3 .
Claim 8
Dependent Claim
19 words
A foam according to claim 1 having a density of from about 1.0 to about 2.8 lb/ft 3 .
Claim 9
Dependent Claim
18 words
A foam according to claim 4 having a density from about 1.2 to about 2.0 lb/ft 3 .
Claim 10
Dependent Claim
72 words
A foam according to claim 1, wherein the thermoplastic resin is: an olefin resin blend of (a) an olefin polymer selected from the group consisting of homopolymers of ethylene or propylene, copolymers of ethylene or propylene with one or more C 4-8 α-olefins and mixtures thereof; and (b) an interpolymer of ethylene and at least one comonomer, said interpolymer having a melting point less than the melting point of olefin polymer (a).
Claim 11
Dependent Claim
22 words
A foam according to claim 9, wherein component (b) is a copolymer of ethylene and acrylic acid or ethylene and vinyl acetate.
Claim 12
Dependent Claim
20 words
A foam according to claim 10, wherein component (b) comprises from about 85 to about 98 percent by weight ethylene.
Claim 13
Dependent Claim
19 words
A foam according to claim 11, wherein component (b) is a homogeneous random copolymer of ethylene and acrylic acid.
Claim 14
Dependent Claim
17 words
A foam according to claim 1, wherein the thermoplastic resin is an alkenyl aromatic synthetic resinous material.
Claim 15
Dependent Claim
15 words
A foam according to claim 13, wherein the alkenyl aromatic synthetic resinous material is polystyrene.
Claim 16
Dependent Claim
36 words
A foam according to claim 1, wherein the strands are each approximately 0.5 to about 10.0 mm in the largest cross-sectional dimension, or the profiles are each approximately 0.5 to about 10.0 mm in cross-sectional thickness.
Claim 17
Dependent Claim
35 words
A foam according to claim 15, wherein the strands are each about 1.0 to 5.0 mm in the largest cross-sectional dimension, or the profiles are each approximately 1.0 to about 5.0 mm in cross-sectional thickness.
Claim 18
Dependent Claim
11 words
A foam according to claim 1 additionally comprising a crosslinking agent.
Claim 19
Dependent Claim
14 words
A foam according to claim 1, wherein the strands have a circular cross-sectional shape.
Claim 20
Dependent Claim
19 words
A foam according to claim 1, wherein the strand's cross-sectional shape is that of a star, cross or X.
Claim 21
Dependent Claim
19 words
A foam according to claim 1 wherein the profiles when coalesced describe in cross-section a repeating structure containing voids.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |