US4843104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Syntactic polymer foam compositions containing microsphere fillers
Assignee: Sovereign Holdings LLC
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Filing: 1987-11-25
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Granted: 1989-06-27
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Expires: 2007-11-25
Abstract
Abstract Microsphere wet cake is mixed with a processing aid efective to prevent agglomeration and surface bonding of the microspheres, and thereafter removing water by drying with continuous mixing, optionally also under reduced pressure, i.e. vacuum drying. By the control of the application of heat and balancing temperature and the mixing, and optionally also the reduced pressure, it is possible to also control expansion of the microspheres from substantially none to substantially theoretical limits of expansion. The processing aid in the present invention is any one of a wide diversity of materials which meet the requirements of the intended function, i.e., to prevent the agglomeration of the microspheres during the process. Suitable materials include, by way of example, dry inorganic pigments or filler materials, and the like, and related organic materials.
Inventors
- 👤 George E. Melber
- 👤 William A. Oswald
- 👤 Leon E. Wolinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:04
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/32; B; B01; B01J; B01J13/00; B01J13/02; B01J13/20; B01J13/206; B82; B82Y; B82Y30/00; C08J3/00; C08J3/12; C08J3/124; C01; C01P; C01P2004/00; C01P2004/30; C01P2004/32; C01P2004/34; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/64; C01P2004/80; C01P2006/00; C01P2006/10; C01P2006/20; C01P2006/32; C01P2006/33; C01P2006/34; C01P2006/60; C01P2006/80; C01P2006/82; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
58 words
A syntactic polymer foam composition comprising a continuous polymer binder matrix and a low density filler comprising dry, free-flowing microspheres, said microspheres comprising from about 3 to about 80 weight percent hollow thermoplastic resin microspheres and from about 97 to about 20 weight percent of a processing aid embedded in and adhered to the surface of said microspheres.
Claim 2
Dependent Claim
58 words
A syntactic polymer foam composition comprising a continuous polymer binder matrix and a low density filler comprising dry, free-flowing microspheres, said microspheres comprising from about 3 to about 80 weight percent hollow thermoplastic resin microspheres and from about 97 to about 20 weight percent of a processing aid embedded in and adhered to the surface of said microspheres.
Claim 3
Dependent Claim
16 words
The syntactic polymer foam composition of claim 1 wherein said polymer binder matrix is a thermoplastic.
Claim 4
Dependent Claim
16 words
The syntactic polymer foam composition of claim 1 wherein said polymer binder matrix is a thermoset.
Claim 5
Dependent Claim
16 words
The syntactic polymer foam composition of claim 1 wherein said polymer binder matrix is cross linked.
Claim 6
Dependent Claim
21 words
The syntactic polymer foam composition of claim 1 wherein said polymer binder matrix bonds to the processing aid of said microspheres.
Claim 7
Dependent Claim
20 words
The syntactic polymer foam composition of claim 1 wherein said processing aid is a reinforcing filler for said polymer binder.
Claim 8
Dependent Claim
26 words
The syntactic polymer foam composition of claim 1 wherein said processing aid at least partially comprises a reinforcing fiber filler in the said polymer binder matrix.
Claim 9
Dependent Claim
48 words
The syntactic polymer foam composition of claim 1 wherein said processing aid is a free-flowing particulate or fibrous solid have a melting point above the temperature of the drying process, finely divided enough to be able to effectively blend with and adhere to the surfaces of the microspheres.
Claim 10
Dependent Claim
53 words
The syntactic polymer foam composition of claim 1 wherein said processing aid is a member selected from the group consisting of talc, calcium carbonate, barium sulfate, alumina, silica, titanium dioxide, zinc oxide, spherical beads, or hollow beads, of ceramics, quartz, or glass, glass fibers, cotton flock, carbon and graphite fibers, and mixtures thereof.
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) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |