US4532265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkenyl aromatic monomer olefinically unsaturated acid foams and method for the preparation thereof
Assignee: Dow Chemical Co
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Filing: 1984-03-12
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Granted: 1985-07-30
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Expires: 2004-03-12
Abstract
Abstract Highly desirable alkenylaromatic monomer olefinically unsaturated acid foams are prepared by extrusion using as a blowing agent inorganic compounds such as sodium bicarbonate, either alone or in combination with volatile fluid foaming agents.
Inventors
- 👤 Chung P. Park
- 👤 Kyung W. Suh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:38
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/127; C08J9/06; C08J9/08; C08J2203/00; C08J2203/02; C08J2325/00; C08J2325/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
188 words
An improved alkenyl aromatic polymer foam, the foam having a density of from about 0.5 to 8 pounds per cubic foot, a cell size of from about 0.1 to 5 millimeters, the foam having a synthetic resinous thermoplastic body comprised of a polymer having a weight average molecular weight of from about 100,000 to about 350,000 gram moles, the polymer having polymerized therein from about 99 to 70 parts by weight of alkenyl aromatic monomer and from about 1 to 30 parts by weight of an olefinically unsaturated acid selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid and mixtures thereof, the body defining a plurality of closed gas filled cells, the foam body having an ion therein, the ion being selected from a group consisting of sodium, magnesium, zinc, ammonium and mixtures thereof, wherein the foam was prepared by extrusion of heat plastified polymer containing as a blowing agent from about 0.5 to 20 parts by weight per 100 parts of polymer of a member selected from the group consisting of carbonates, carbonate hydrates and bicarbonates of sodium, magnesium, zinc, ammonium and mixtures thereof.
Claim 2
Dependent Claim
188 words
An improved alkenyl aromatic polymer foam, the foam having a density of from about 0.5 to 8 pounds per cubic foot, a cell size of from about 0.1 to 5 millimeters, the foam having a synthetic resinous thermoplastic body comprised of a polymer having a weight average molecular weight of from about 100,000 to about 350,000 gram moles, the polymer having polymerized therein from about 99 to 70 parts by weight of alkenyl aromatic monomer and from about 1 to 30 parts by weight of an olefinically unsaturated acid selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid and mixtures thereof, the body defining a plurality of closed gas filled cells, the foam body having an ion therein, the ion being selected from a group consisting of sodium, magnesium, zinc, ammonium and mixtures thereof, wherein the foam was prepared by extrusion of heat plastified polymer containing as a blowing agent from about 0.5 to 20 parts by weight per 100 parts of polymer of a member selected from the group consisting of carbonates, carbonate hydrates and bicarbonates of sodium, magnesium, zinc, ammonium and mixtures thereof.
Claim 3
Dependent Claim
20 words
The foam of claim 1 wherein the molecular weight of the polymer is from about 150,000 to 300,000 gram moles.
Claim 4
Dependent Claim
29 words
The foam of claim 1 wherein the acid is present in a proportion of from about 5 to 20 parts by weight based on the weight of the polymer.
Claim 5
Dependent Claim
14 words
The foam of claim 1 which was prepared employing sodium bicarbonate as blowing agent.
Claim 6
Dependent Claim
16 words
The foam of claim 1 wherein the polymer is a polymer of styrene and acrylic acid.
Claim 7
Dependent Claim
17 words
The foam of claim 1 wherein the polymer is a polymer of vinyl toluene and acrylic acid.
Claim 8
Dependent Claim
17 words
The foam of claim 1 having a density of about 1 to 5 pounds per cubic foot.
Claim 9
Dependent Claim
16 words
The foam of claim 1 having a cell size of from about 0.1 to 2.5 millimeters.
Claim 10
Dependent Claim
102 words
An improved styrene polymer foam, the foam having a density of from about 1 to 5 pounds per cubic foot, the foam having a synthetic resinous thermoplastic body comprised of a polymer having a weight average molecular weight of from about 150,000 to about 300,000 gram moles, the polymer having polymerized therein from about 95 to 80 parts by weight of styrene and from about 5 to 20 parts by weight of acrylic acid, the body defining a plurality of closed gas filled cells, having a cell size of from about 0.1 to 2.5 millimeters, the foam body having sodium ions therein.
Claim 11
Dependent Claim
102 words
An improved styrene polymer foam, the foam having a density of from about 1 to 5 pounds per cubic foot, the foam having a synthetic resinous thermoplastic body comprised of a polymer having a weight average molecular weight of from about 150,000 to about 300,000 gram moles, the polymer having polymerized therein from about 95 to 80 parts by weight of styrene and from about 5 to 20 parts by weight of acrylic acid, the body defining a plurality of closed gas filled cells, having a cell size of from about 0.1 to 2.5 millimeters, the foam body having sodium ions therein.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |