US4240998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of composite foamed material
Assignee: PENDING NO 1 Inc
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Filing: 1979-04-05
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Granted: 1980-12-23
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Expires: 1999-04-05
Abstract
Abstract A process is disclosed herein for the production of a composite foamed material which comprises premixing expandable polystyrene beads and a binder and adding the premix to fragments of resilient, open-celled material. The materials are combined in the proportions of about 4-15% polystyrene beads, about 6-25% binder and about 60-90% open-celled material. The combined materials are compressed to a density of about 5-30 lbs per cubic foot, preferably 5-17 lbs per cubic foot, and steam is applied to the compressed materials to cure the binder and expand the polystyrene beads, producing the desired composite foamed material.
Inventors
- 👤 Seymour Lichter
- 👤 Frank P. Nold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:57
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/228; C08J9/236; B; B29; B29C; B29C44/00; B29C44/02; B29C44/10; B29C44/34; B29C44/36; B29C44/38; B29C44/44; B29C44/445; B29C67/00; B29C67/20; B29C67/207; C08J9/232; C08J9/35; B29C44/3415; B29C44/3426; B29K; B29K2025/00; B29K2105/00; B29K2105/04; B29K2105/045; C08J2375/00; C08J2375/04; C08J2425/00; C08J2425/02; C08J2425/04; C08J2425/06; Y; Y10; Y10S; Y10S264/00; Y10S264/07; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
94 words
A process for producing a composite foamed material which comprises the steps of: a. combining into a mix from about 4% to about 15% of expandable polystyrene beads, from about 6% to about 25% of a binder and from about 60% to about 90% of fragments of resilient, open-celled material; b. compressing the mix within a mold to a density of from about 5 to about 30 lbs/ft 3 ; c. curing the binder while the mix is held in compression; and d. expanding the polystyrene beads while the mix is held in compression.
Claim 2
Dependent Claim
94 words
A process for producing a composite foamed material which comprises the steps of: a. combining into a mix from about 4% to about 15% of expandable polystyrene beads, from about 6% to about 25% of a binder and from about 60% to about 90% of fragments of resilient, open-celled material; b. compressing the mix within a mold to a density of from about 5 to about 30 lbs/ft 3 ; c. curing the binder while the mix is held in compression; and d. expanding the polystyrene beads while the mix is held in compression.
Claim 3
Dependent Claim
29 words
The process of claim 1 in which the compressing of step b. comprises compressing the mix to a density of from about 5 to about 17 lbs/ft 3 .
Claim 4
Dependent Claim
44 words
The process of claim 1 in which the combining of step a. comprises the substeps of premixing the polystyrene beads and the binder of disperse the polystyrene beads within the binder, and adding the premixed polystyrene beads and binder to the resilient, open-celled material.
Claim 5
Dependent Claim
35 words
The process of claim 3 in which the combining of step a. comprises the combining of about 7.5% of the polystyrene beads, about 12.5% of the binder and about 80% of the resilient, open-celled material.
Claim 6
Dependent Claim
14 words
The process of claim 3 in which the resilient, open-celled material is polyurethane foam.
Claim 7
Dependent Claim
14 words
The process of claim 5 in which the binder is a polyurethane prepolymer binder.
Claim 8
Dependent Claim
29 words
The process of claim 3 in which the compressing of step b. comprises compressing the mix to a density of from about 7 to about 9 lbs/ft 3 .
Claim 9
Dependent Claim
23 words
The process of claim 7 in which the amount of the binder is about 10% of the amount of the resilient, open-celled material.
Claim 10
Dependent Claim
21 words
The process of claim 7 in which the polystyrene beads have a maximum diameter of about 0.1 mm prior to expansion.
Claim 11
Dependent Claim
34 words
The process of claim 7 in which the combining of step a. comprises the combining of about 7.5% of expandable polystyrene beads, about 12.5% of a binder and about 80% of resilient, open-celled material.
Claim 12
Dependent Claim
32 words
The process of claim 3 in which the curing of step c. and the expanding of step d. comprise applying steam to the mold in which the mix is held in compression.
Claim 13
Dependent Claim
38 words
The process of claim 11 in which the applying of steam is for a period of about 2-5 minutes, but for a period less than the amount of time which would cause collapse of the expanded polystyrene beads.
Claim 14
Dependent Claim
48 words
The process of claim 11 in which the compressing of step b. comprises compressing the mix between a pair of spaced apart, perforate members, and the applying of steam comprises passing steam successively through one of the perforate members, the mix, and the other of the perforate members.
References Cited (Backward Citations)
US2878153A
Cited
US2892216A
Cited
US2959508A
Cited
GB889278A
Cited
US3114722A
Cited
US2958905A
Cited
GB1033702A
Cited
US3251916A
Cited
US3300421A
Cited
US3585157A
Cited
US3503840A
Cited
US3607797A
Cited
US3878133A
Cited
US3894973A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |