US4722972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foams of ionically associated blends of styrenic and ethylenic polymers
Assignee: Dow Chemical Co
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Filing: 1986-02-10
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Granted: 1988-02-02
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Expires: 2006-02-10
Abstract
Abstract Novel foamed thermoplastic resins are disclosed. The foam includes an ionically associated blend containing at least about 60 weight % of a metal salt of a styrene-acrylic acid copolymer and at least 1 weight % of a metal salt of an ethylene-acrylic acid copolymer. The foams typically are prepared by extruding a ternary mixture of a styrene-acrylic acid copolymer, an ethylene-acrylic copolymer and an alkali metal bicarbonate which functions as the foaming agent. The ionically associated blends included in the foam are believed to be novel compositions of matter.
Inventors
- 👤 Chung P. Park
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:56
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J9/04; C08J9/06; C08J9/08; C08J2325/00; C08J2325/02; C08J2423/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
112 words
An ionically associated blend of a styrenic polymer and an ethylenic polymer which comprises: (a) at least about 60 weight % of an ionic styrenic polymer; and (b) at least about 1 weight % of an ionic ethylenic polymer; said ionic styrenic polymer being a ammonium salt of a polymer having polymerized therein at least about 70 weight % of styrene or a right alkyl-substituted styrene and about 1-30 weight % of an ethylenically unsaturated acid monomer polymerizable therewith; said ethylenic polymer being a ammonium salt of a polymer having polymerized therein at least about 60 weight % ethylene and about 1-40 weight % of an ethylenically unsaturated acid monomer polymerizable therewith.
Claim 2
Dependent Claim
112 words
An ionically associated blend of a styrenic polymer and an ethylenic polymer which comprises: (a) at least about 60 weight % of an ionic styrenic polymer; and (b) at least about 1 weight % of an ionic ethylenic polymer; said ionic styrenic polymer being a ammonium salt of a polymer having polymerized therein at least about 70 weight % of styrene or a right alkyl-substituted styrene and about 1-30 weight % of an ethylenically unsaturated acid monomer polymerizable therewith; said ethylenic polymer being a ammonium salt of a polymer having polymerized therein at least about 60 weight % ethylene and about 1-40 weight % of an ethylenically unsaturated acid monomer polymerizable therewith.
Claim 3
Dependent Claim
28 words
A blend of claim 1 in which both the styrenic polymer and the ethylenic polymer have polymerized therein about 3-20 weight % of the ethylenically unsaturated acid monomer.
Claim 4
Dependent Claim
26 words
A blend of claim 2 in which the ethylenically unsaturated acid monomer polymerized in both the styrenic and ethylenic polymer is acrylic acid or methacrylic acid.
References Cited (Backward Citations)
US3437718A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-01 | 1991-08-03 | 1992-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-01 | 1995-08-03 | 1996-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-01 | 1999-08-03 | 2000-02-02 | $7700.00 | Window Closed / Lapsed |