Patent US4520137A successfully refreshed from Google Patents.
US4520137A
Expired / Lapsed
US
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One-part activator and blowing agent for foaming plastics
Assignee: ATK Launch Systems LLC
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Filing: 1984-10-18
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Granted: 1985-05-28
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Expires: 2004-10-18
Abstract
Abstract A one-part activator and blowing agent system for foaming plastics comprising an alkali metal borohydride and a salt hydrate blended in a single pellet or as separate pellets with a dry inert resinous polymer carrier. The one-part system is blended with a resinous polymer and then the blend extruded at a temperature at which the blend becomes molten such that the salt hydrate releases its water of hydration to hydrolyze the borohydride and produce a cellular article.
Inventors
- 👤 Roger G. Hamel
- 👤 Susan B. Poulin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:42
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/065; B; B29; B29B; B29B7/00; B29B7/74; B29B7/7404; B29B9/00; B29B9/02; B29B9/06; B29K; B29K2105/00; B29K2105/04; Y; Y10; Y10S; Y10S264/00; Y10S264/05
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
27 words
A stable one-part borohydride activator concentrate which has been previously blended and melted consisting essentially an inert resinous polymer, an alkali metal borohydride and a salt hydrate.
Claim 2
Dependent Claim
27 words
A stable one-part borohydride activator concentrate which has been previously blended and melted consisting essentially an inert resinous polymer, an alkali metal borohydride and a salt hydrate.
Claim 3
Dependent Claim
19 words
The concentrate of claim 1 wherein the borohydride is present at between about 0.5% and about 25.0% by weight.
Claim 4
Dependent Claim
16 words
The concentrate of claim 1 wherein the alkali metal borohydride is sodium borohydride or potassium borohydride.
Claim 5
Dependent Claim
32 words
The concentrate of claim 1 wherein the salt hydrate is Na 2 B 4 O 7 .5H 2 O, MgSO 3 .6H 2 O, MgSO 4 .7H 2 O, or alumina trihydrate.
Claim 6
Dependent Claim
18 words
The concentrate of claim 1 wherein the resin is a polyolefin, polydiene, polystyrene, polyphenylene oxide-styrene, polyacrylate, or polyvinylacetate.
Claim 7
Dependent Claim
63 words
A stable, one-part borohydride activator system consisting essentially a mixture of a first composition and a second composition wherein: (a) the first concentrate which has been previously blended and melted composition comprises an inert resinous polymer and an alkali metal borohydride; and (b) the second concentrate which has been previously blended and melted composition comprises an inert resinous polymer and a salt hydrate.
Claim 8
Dependent Claim
63 words
A stable, one-part borohydride activator system consisting essentially a mixture of a first composition and a second composition wherein: (a) the first concentrate which has been previously blended and melted composition comprises an inert resinous polymer and an alkali metal borohydride; and (b) the second concentrate which has been previously blended and melted composition comprises an inert resinous polymer and a salt hydrate.
Claim 9
Dependent Claim
19 words
The system of claim 6 wherein the borohydride is present at between about 0.5% and about 25.0% by weight.
Claim 10
Dependent Claim
16 words
The system of claim 6 wherein the alkali metal borohydride is sodium borohydride or potassium borohydride.
Claim 11
Dependent Claim
32 words
The system of claim 6 wherein the salt hydrate is Na 2 B 4 O 7 .5H 2 O, MgSO 3 .6H 2 O, MgSO 4 .7H 2 O, or alumina trihydrate.
Claim 12
Dependent Claim
18 words
The system of claim 6 wherein the resin is a polyolefin, polydiene, polystyrene, polyphenylene oxide-styrene, polyacrylate, or polyvinylacetate.
Claim 13
Dependent Claim
50 words
A method of making a cellular article comprising: (a) mixing a foaming effective amount of the concentrate of claim 1 with a resinous polymer; and (b) extruding the mixture at a temperature at which the resinous polymer is molten when the water of hydration is released to hydrolyze the borohydride.
Claim 14
Dependent Claim
50 words
A method of making a cellular article comprising: (a) mixing a foaming effective amount of the system of claim 6 with a resinous polymer; and (b) extruding the mixture at a temperature at which the resinous polymer is molten when the water of hydration is released to hydrolyze the borohydride.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |