Patent US3599642A successfully refreshed from Google Patents.
US4179546A
Expired / Lapsed
US
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Method for expanding microspheres and expandable composition
Assignee: Casco Adhesives AB
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Filing: 1974-09-12
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Granted: 1979-12-18
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Expires: 1994-09-12
Abstract
Abstract Thermoplastic microspheres are readily expanded to low densities by heating in water in the presence of hydrogen peroxide.
Inventors
- 👤 Joseph L. Garner
- 👤 Peter A. Tiffany
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:22
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/228
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
81 words
An aqueous mass of expandable synthetic resinous microspheres, the microspheres beng expandable to form a monocellular hollow gas filled polymer cell at a temperature below the boiling point of water, the microspheres having a synthetic resinous thermosplastic shell symmetrically encapsulating therein a single droplet of volatile liquid raising agent, the microspheres being in an aqueous dispersing medium, the aqueous dispersing medium having dissolved therein from about 0.2 to 5 weight percent, based on the weight of the microspheres, of hydrogen peroxide.
Claim 2
Dependent Claim
81 words
An aqueous mass of expandable synthetic resinous microspheres, the microspheres beng expandable to form a monocellular hollow gas filled polymer cell at a temperature below the boiling point of water, the microspheres having a synthetic resinous thermosplastic shell symmetrically encapsulating therein a single droplet of volatile liquid raising agent, the microspheres being in an aqueous dispersing medium, the aqueous dispersing medium having dissolved therein from about 0.2 to 5 weight percent, based on the weight of the microspheres, of hydrogen peroxide.
Claim 3
Dependent Claim
25 words
The mass of claim 1 wherein a salt is present in an amount to provide at least 0.15 hydrogen equivalents per 100 grams of water.
Claim 4
Dependent Claim
87 words
An aqueous mass of expandable synthetic resinous microspheres, the microspheres being expandable to form a monocellular hollow gas filled polymer cell at a temperature below the boiling point of water, the microspheres having a thermoplastic shell of a polymer containing vinylidene chloride, the shell symmetrically encapsulating therein a single droplet of volatile liquid raising agent, the microspheres being in an aqueous dispersing medium, the aqueous dispersing medium having dissolved therein from about 0.2 to 5 weight percent, based on the weight of the microspheres, of hydrogen peroxide.
Claim 5
Dependent Claim
87 words
An aqueous mass of expandable synthetic resinous microspheres, the microspheres being expandable to form a monocellular hollow gas filled polymer cell at a temperature below the boiling point of water, the microspheres having a thermoplastic shell of a polymer containing vinylidene chloride, the shell symmetrically encapsulating therein a single droplet of volatile liquid raising agent, the microspheres being in an aqueous dispersing medium, the aqueous dispersing medium having dissolved therein from about 0.2 to 5 weight percent, based on the weight of the microspheres, of hydrogen peroxide.
Claim 6
Independent Claim
114 words
A method for the expansion of expandable synthetic resinous microspheres, the microspheres having a synthetic resinous thermoplastic shell symmetrically encapsulating therein a single droplet of a volatile liquid raising agent and on heating being capable of expanding to form a hollow gas filled polymeric monocellular particle, the steps of the method comprising providing a mass of expandable microspheres in an aqueous medium, adding to and dissolving in the aqueous medium from about 0.2 to 5 weight percent, based of the weight of the microspheres, of hydrogen peroxide and subsequently heating the aqueous medium to a temperature below the boiling point of water to cause the microspheres to expand to form monocellular gas filled particles.
Claim 7
Independent Claim
114 words
A method for the expansion of expandable synthetic resinous microspheres, the microspheres having a synthetic resinous thermoplastic shell symmetrically encapsulating therein a single droplet of a volatile liquid raising agent and on heating being capable of expanding to form a hollow gas filled polymeric monocellular particle, the steps of the method comprising providing a mass of expandable microspheres in an aqueous medium, adding to and dissolving in the aqueous medium from about 0.2 to 5 weight percent, based of the weight of the microspheres, of hydrogen peroxide and subsequently heating the aqueous medium to a temperature below the boiling point of water to cause the microspheres to expand to form monocellular gas filled particles.
Claim 8
Dependent Claim
27 words
The method of claim 4 including the step of adding a salt in an amount to provide at least 0.15 hydrogen equivalents per 100 grams of water.
Claim 9
Independent Claim
119 words
A method for the expansion of expandable synthetic resinous microspheres, the microspheres having a synthetic resinous thermoplastic shell of a polymer containing vinylidene chloride symmetrically encapsulating therein a single droplet of a volatile liquid raising agent and on heating being capable of expanding to form a hollow gas filled polymeric monocellular particle, the steps of the method comprising providing a mass of expandable microspheres in an aqueous medium, dissolving in the aqueous medium from about 0.2 to 5 weight percent, based on the weight of the microspheres, of hydrogen peroxide and subsequently heating the medium and microspheres to a temperature below the boiling point of water to cause the microspheres to expand and form hollow monocellular gas filled particles.
Claim 10
Independent Claim
119 words
A method for the expansion of expandable synthetic resinous microspheres, the microspheres having a synthetic resinous thermoplastic shell of a polymer containing vinylidene chloride symmetrically encapsulating therein a single droplet of a volatile liquid raising agent and on heating being capable of expanding to form a hollow gas filled polymeric monocellular particle, the steps of the method comprising providing a mass of expandable microspheres in an aqueous medium, dissolving in the aqueous medium from about 0.2 to 5 weight percent, based on the weight of the microspheres, of hydrogen peroxide and subsequently heating the medium and microspheres to a temperature below the boiling point of water to cause the microspheres to expand and form hollow monocellular gas filled particles.
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) | 1982-12-17 | 1983-06-18 | 1983-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-17 | 1987-06-18 | 1987-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-17 | 1991-06-18 | 1991-12-18 | $7700.00 | Window Closed / Lapsed |