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Patent US4312910A successfully refreshed from Google Patents.
US4312910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Styrene-acrylic acid copolymer foam
Assignee: Dow Chemical Co
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Filing: 1980-04-04
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Granted: 1982-01-26
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Expires: 2000-04-04
Abstract
Abstract Machinable foams having improved solvent resistance are prepared from a styrene-acrylic acid copolymer.
Inventors
- 👤 Kyung W. Suh
- 👤 Jonathan R. Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:05
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/141; C08J2325/00; C08J2325/02; C08J2325/04; C08J2325/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
111 words
A synthetic resinous thermoplastic extruded foam having a direction of extrusion and an axis of extrusion, the foam having a plurality of generally closed cells containing gas, the foam having a cross sectional configuration taken in a plane normal to the axis of extrusion of at least 8 square inches and a minimum dimension of at least 0.7 inch, the foam comprising a copolymer of from about 99.5 parts by weight of styrene to about 70 parts by weight styrene copolymerized therein from about 0.5 to about 30 parts by weight of acrylic acid, the molecular weight of the styrene-acrylic acid copolymer is from about 100,000 to about 350,000 gram moles.
Claim 2
Dependent Claim
111 words
A synthetic resinous thermoplastic extruded foam having a direction of extrusion and an axis of extrusion, the foam having a plurality of generally closed cells containing gas, the foam having a cross sectional configuration taken in a plane normal to the axis of extrusion of at least 8 square inches and a minimum dimension of at least 0.7 inch, the foam comprising a copolymer of from about 99.5 parts by weight of styrene to about 70 parts by weight styrene copolymerized therein from about 0.5 to about 30 parts by weight of acrylic acid, the molecular weight of the styrene-acrylic acid copolymer is from about 100,000 to about 350,000 gram moles.
Claim 3
Dependent Claim
29 words
The foam of claim 1 wherein the copolymer contains from about 1 to 20 parts by weight acrylic acid and from about 99 to 80 parts by weight styrene.
Claim 4
Dependent Claim
30 words
The foam of claim 2 wherein the copolymer contains from about 5 to 20 parts by weight acrylic acid and from about 95 to 80 parts by weight of polystyrene.
Claim 5
Dependent Claim
17 words
The foam of claim 1 having a density of about 1.2 to 5 pounds per cubic foot.
Claim 6
Dependent Claim
19 words
The foam of claim 1 having an average cell size within the range of 0.5 to about 3 millimeters.
Claim 7
Dependent Claim
140 words
A synthetic resinous thermoplastic extruded foam having a direction of extrusion and an axis of extrusion, the foam having a plurality of generally closed cells containing gas, the foam having a cross sectional configuration taken in a plane normal to the axis of extrusion of at least 8 square inches and a minimum dimension of at least 0.7 inch, the foam comprising a copolymer of from about 99.5 parts by weight of styrene to about 70 parts by weight styrene copolymerized therein from about 0.5 to about 30 parts by weight of acrylic acid, the molecular weight of the styrene-acrylic acid copolymer is from about 100,000 to about 300,000 gram moles, the foam having a density of from about 1.2 to 5 pounds per cubic foot and an average cell size within the range of 0.5 to about 3 millimeters.
Claim 8
Dependent Claim
140 words
A synthetic resinous thermoplastic extruded foam having a direction of extrusion and an axis of extrusion, the foam having a plurality of generally closed cells containing gas, the foam having a cross sectional configuration taken in a plane normal to the axis of extrusion of at least 8 square inches and a minimum dimension of at least 0.7 inch, the foam comprising a copolymer of from about 99.5 parts by weight of styrene to about 70 parts by weight styrene copolymerized therein from about 0.5 to about 30 parts by weight of acrylic acid, the molecular weight of the styrene-acrylic acid copolymer is from about 100,000 to about 300,000 gram moles, the foam having a density of from about 1.2 to 5 pounds per cubic foot and an average cell size within the range of 0.5 to about 3 millimeters.
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) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |