Patent US4138356A successfully refreshed from Google Patents.
US4138356A
Expired / Lapsed
US
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Encapsulated flame retardant system
Assignee: Champion International Corp
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Filing: 1976-02-19
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Granted: 1979-02-06
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Expires: 1996-02-19
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.
Inventors
- 👤 David N. Vincent
- 👤 Ronald Golden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:50
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: 12
Claim 1
Independent Claim
65 words
A composition for use in the production of a foamed plastic containing microcapsules which comprises as separate ingredients, a polyol polymer precursor and flame retardant microcapsules, 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, said capsule wall comprising a polyhydroxy-bearing polymer.
Claim 2
Dependent Claim
65 words
A composition for use in the production of a foamed plastic containing microcapsules which comprises as separate ingredients, a polyol polymer precursor and flame retardant microcapsules, 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, said capsule wall comprising a polyhydroxy-bearing polymer.
Claim 3
Dependent Claim
11 words
The composition of claim 1 wherein said polyol is a polyether.
Claim 4
Dependent Claim
16 words
The composition of claim 2 wherein said microcapsules have walls comprising poly(vinyl alcohol), methylcellulose or starch.
Claim 5
Dependent Claim
13 words
The composition of claim 3 wherein said microcapsules have walls comprising poly(vinyl alcohol).
Claim 6
Dependent Claim
21 words
The composition of claim 2 wherein said microcapsules have an average particle diameter of between about 2 and about 4 microns.
Claim 7
Dependent Claim
18 words
The composition of claim 2 wherein said microcapsules have an average particle diameter of below about 2 microns.
Claim 8
Dependent Claim
13 words
The composition of claim 2 wherein said flame retardant material comprises tris(2,3-dibromopropyl) phosphate.
Claim 9
Dependent Claim
11 words
The composition of claim 2 wherein said foam plastic comprises polyurethane.
Claim 10
Dependent Claim
17 words
The composition of claim 2 wherein said flame retardant material is encapsulated in liquid or solid form.
Claim 11
Dependent Claim
79 words
A composition for use in the production of a polyurethane foam containing microcapsules which comprises as separate ingredients a polyol selected from the group consisting of polyethylene glycol, polypropylene glycol and polyethylene glycol/polypropylene glycol block copolymers, and flame retardant microcapsules, said microcapsules having substantially spherical, solid, polymeric walls surrounding a substantially core consisting of a flame retardant material, said microcapsules having an average particle diameter of between about 2 and about 4 microns, said capsule walls comprising poly(vinyl alcohol).
Claim 12
Dependent Claim
79 words
A composition for use in the production of a polyurethane foam containing microcapsules which comprises as separate ingredients a polyol selected from the group consisting of polyethylene glycol, polypropylene glycol and polyethylene glycol/polypropylene glycol block copolymers, and flame retardant microcapsules, said microcapsules having substantially spherical, solid, polymeric walls surrounding a substantially core consisting of a flame retardant material, said microcapsules having an average particle diameter of between about 2 and about 4 microns, said capsule walls comprising poly(vinyl alcohol).
References Cited (Backward Citations)
US3455848A
Cited
US3852401A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-05 | 1982-08-07 | 1983-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-05 | 1986-08-07 | 1987-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-05 | 1990-08-07 | 1991-02-06 | $7700.00 | Window Closed / Lapsed |