Patent US3968060A successfully refreshed from Google Patents.
US3968060A
Expired / Lapsed
US
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Encapsulated flame retardant system
Assignee: Champion International Corp
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Filing: 1973-08-22
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Granted: 1976-07-06
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Expires: 1993-08-22
Abstract
Abstract Microcapsules having an average diameter below 5 microns and containing a flame retardant material are incorporated into polymeric materials, such as polyurethane foams without affecting the structural integrity of the cell walls of the foam. The capsules are chemically bonded to the foam, as well as physically incorporated therein by employing polyhydroxy polymer-containing capsule wall materials which react with the isocyanate used in the polyurethane. The minute capsules are incorporated into paint to give increased hiding power as well as flame resistance, and are co-extruded into filaments.
Inventors
- 👤 David N. Vincent
- 👤 Ronald Golden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:10
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/10; C08G; C08G18/00; C08G18/06; C08G18/08; C08J; C08J9/00; C08J9/009; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S521/00; Y10S521/906; Y10S521/907; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249954; Y10T428/249986; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
46 words
A self-extinguishing composition comprising a foamed plastic containing microcapsules in the cell walls thereof, said microcapsules having substantially spherical, solid, polymeric walls surrounding a substantially spherical core consisting essentially of a flame retardant material, said microcapsules having an average particle diameter of below about 5 microns.
Claim 2
Dependent Claim
46 words
A self-extinguishing composition comprising a foamed plastic containing microcapsules in the cell walls thereof, said microcapsules having substantially spherical, solid, polymeric walls surrounding a substantially spherical core consisting essentially of a flame retardant material, said microcapsules having an average particle diameter of below about 5 microns.
Claim 3
Dependent Claim
14 words
The self-extinguishing article of claim 1 wherein said plastic foam is a polyurethane foam.
Claim 4
Dependent Claim
16 words
The self-extinguishing article of claim 2 wherein said microcapsules have walls comprising a polyhydroxy bearing polymer.
Claim 5
Dependent Claim
13 words
The self-extinguishing article of claim 3 wherein said polyhydroxy polymer is poly(vinyl alcohol).
Claim 6
Dependent Claim
22 words
The shaped article of claim 2 wherein said microcapsules have an average particle diameter of between about 2 and about 4 microns.
Claim 7
Dependent Claim
15 words
The self-extinguishing composition of claim 1 wherein said flame retardant material is tris (2,3-dibromopropyl) phosphate.
Claim 8
Dependent Claim
14 words
The self-extinguishing composition of claim 3 wherein said polyhydroxy polymer is methylcellulose or starch.
Claim 9
Dependent Claim
19 words
The self-extinguishing composition of claim 2 wherein said microcapsules have an average particle diameter of below about 2 microns.
Claim 10
Dependent Claim
59 words
A self-extinguishing composition comprising a foamed plastic, said foamed plastic having cell walls having a thickness in the range of 10 to 25 microns, said cell walls containing microcapsules having substantially spherical, solid, polymeric walls surrounding a substantially spherical core consisting essentially of a flame retardant material said microcapsules having an average particle diameter of below about 5 microns.
Claim 11
Dependent Claim
59 words
A self-extinguishing composition comprising a foamed plastic, said foamed plastic having cell walls having a thickness in the range of 10 to 25 microns, said cell walls containing microcapsules having substantially spherical, solid, polymeric walls surrounding a substantially spherical core consisting essentially of a flame retardant material said microcapsules having an average particle diameter of below about 5 microns.
Claim 12
Dependent Claim
13 words
The composition of claim 9 wherein said foamed plastic is a polyurethane foam.
Claim 13
Dependent Claim
16 words
The composition of claim 10 wherein said microcapsules have polymeric walls comprising a polyhydroxy bearing polymer.
Claim 14
Dependent Claim
21 words
The composition of claim 9 wherein said microcapsules have an average particle diameter of between about 2 and about 4 microns.
Claim 15
Dependent Claim
13 words
The composition of claim 11 wherein said polyhydroxy bearing polymer is poly(vinyl alcohol).
Claim 16
Dependent Claim
14 words
The composition of claim 13 wherein said polymer is cross-linked by a polyfunctional isocyanate.
Claim 17
Dependent Claim
83 words
A self-extinguishing composition comprising a polyurethane foam, said foamed polyurethane having cell walls having a thickness in the range of 10 to 25 microns, said cell walls containing microcapsules having substantially spherical, solid, polymeric walls comprising a polyhydroxy bearing polymer, said microcapsules having an average particle diameter of between about 2 and about 4 microns, said microcapsules being chemically bonded to said polyurethane by virtue of a chemical reaction between the polyisocyanate forming said polyurethane and hydroxy groups available from said capsule walls.
Claim 18
Dependent Claim
83 words
A self-extinguishing composition comprising a polyurethane foam, said foamed polyurethane having cell walls having a thickness in the range of 10 to 25 microns, said cell walls containing microcapsules having substantially spherical, solid, polymeric walls comprising a polyhydroxy bearing polymer, said microcapsules having an average particle diameter of between about 2 and about 4 microns, said microcapsules being chemically bonded to said polyurethane by virtue of a chemical reaction between the polyisocyanate forming said polyurethane and hydroxy groups available from said capsule walls.
Claim 19
Dependent Claim
13 words
The composition of claim 15 wherein said polyhydroxy bearing polymer is poly(vinyl alcohol).
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) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |