US3887730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microporous styrene polymers and method of making same
Assignee: Philip Morris USA Inc
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Filing: 1972-08-21
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Granted: 1975-06-03
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Expires: 1992-08-21
Abstract
Abstract Microporous styrene polymers are provided having randomly interconnected open network of irregularly shaped pores whose walls consist of cohered spherical particles of the polymer. These microporous styrene polymers are produced by mixing styrene polymer latex with a water-soluble ether, casting, molding, or impregnating the resulting mixture into a fibrous material, heating same to a temperature of from about 80*C to about 120*C and removing the ether.
Inventors
- 👤 Norman B Rainer
- 👤 Peter Allen Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:26
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; A; A24; A24D; A24D3/00; A24D3/06; A24D3/08; C08J9/00; C08J9/28; C08J2201/00; C08J2201/04; C08J2201/054; C08J2201/0542; C08J2201/0543; C08J2201/0545; C08J2201/0546; C08J2325/00; C08J2325/02; C08J2325/04; Y; Y10; Y10S; Y10S428/00; Y10S428/904
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
113 words
A PROCESS FOR PREPARING A MICROPOROUS PRODUCT WHICH PROCESS COMPRISES: A. DILUTING A STYRENE POLYMER LATEX, SAID STYRENE POLYMER BEING NON-FILM FORMING AND COMPRISING AT LEAST 80 PERCENT STYRENE, WITH A WATER-SOLUBLE ETHER COMPATIBLE WITH SAID POLYMER AND HAVING A BOILING POINT ABOVE ABOUT 85*C, SAID ETHER BEING EMPLOYED IN AN AMOUNT SUFFICIENT TO FORM A DISPERSION CONTAINING FROM ABOUT 5 TO ABOUT 30 WEIGHT PERCENT OF SAID POLYMER, B. IMPREGNATING SAID DISPERSION INTO A FIBROUS MATERIAL, AND C. HEATING THE IMPREGNATED FIBROUS MATERIAL TO A TEMPERATURE OF FROM ABOUT 80*C TO ABOUT 120*C, SAID TEMPERATURE BEING LOWER THAN THE BOILING POINT OF SAID ETHER, FOR ABOUT 1 MINUTE TO ABOUT 60 MINUTES.
Claim 2
Dependent Claim
113 words
A PROCESS FOR PREPARING A MICROPOROUS PRODUCT WHICH PROCESS COMPRISES: A. DILUTING A STYRENE POLYMER LATEX, SAID STYRENE POLYMER BEING NON-FILM FORMING AND COMPRISING AT LEAST 80 PERCENT STYRENE, WITH A WATER-SOLUBLE ETHER COMPATIBLE WITH SAID POLYMER AND HAVING A BOILING POINT ABOVE ABOUT 85*C, SAID ETHER BEING EMPLOYED IN AN AMOUNT SUFFICIENT TO FORM A DISPERSION CONTAINING FROM ABOUT 5 TO ABOUT 30 WEIGHT PERCENT OF SAID POLYMER, B. IMPREGNATING SAID DISPERSION INTO A FIBROUS MATERIAL, AND C. HEATING THE IMPREGNATED FIBROUS MATERIAL TO A TEMPERATURE OF FROM ABOUT 80*C TO ABOUT 120*C, SAID TEMPERATURE BEING LOWER THAN THE BOILING POINT OF SAID ETHER, FOR ABOUT 1 MINUTE TO ABOUT 60 MINUTES.
Claim 3
Dependent Claim
113 words
A process foR preparing a microporous product which process comprises: a. diluting a styrene polymer latex, said styrene polymer being non-film forming and comprising at least 80 percent styrene, with a water-soluble ether compatible with said polymer and having a boiling point above about 85*C, said ether being employed in an amount sufficient to form a dispersion containing from about 5 to about 30 weight percent of said polymer, b. impregnating said dispersion into a fibrous material, and c. heating the impregnated fibrous material to a temperature of from about 80*C to about 120*C, said temperature being lower than the boiling point of said ether, for about 1 minute to about 60 minutes.
Claim 4
Dependent Claim
113 words
A process foR preparing a microporous product which process comprises: a. diluting a styrene polymer latex, said styrene polymer being non-film forming and comprising at least 80 percent styrene, with a water-soluble ether compatible with said polymer and having a boiling point above about 85*C, said ether being employed in an amount sufficient to form a dispersion containing from about 5 to about 30 weight percent of said polymer, b. impregnating said dispersion into a fibrous material, and c. heating the impregnated fibrous material to a temperature of from about 80*C to about 120*C, said temperature being lower than the boiling point of said ether, for about 1 minute to about 60 minutes.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein said ether is removed from said heated impregnated fibrous material.
Claim 6
Dependent Claim
10 words
The process of claim 1 wherein said polymer is polystyrene.
Claim 7
Dependent Claim
10 words
The process of claim 2 wherein said polymer is polystyrene.
Claim 8
Dependent Claim
19 words
The process of claim 1 wherein said polymer is a copolymer of styrene and a monomer copolymerizable with styrene.
Claim 9
Dependent Claim
19 words
The process of claim 2 wherein said polymer is a copolymer of styrene and a monomer copolymerizable with styrene.
Claim 10
Dependent Claim
115 words
A process for preparing a microporous product which process comprises: a. diluting a styrene polymer latex, said styrene polymer being non-film forming and comprising at least 80 percent styrene, with a water-soluble ether compatible with said polymer and having a boiling point above about 85*C, said ether being employed in an amount sufficient to form a dispersion containing from about 5 to about 30 weight percent of said polymer, b. forming said dispersion into a shaped article, and c. heating said dispersion in said shaped article at a temperature of from about 80*C to about 120*C, said temperature being lower than the boiling point of said ether, for about 1 minute to about 60 minutes.
Claim 11
Dependent Claim
115 words
A process for preparing a microporous product which process comprises: a. diluting a styrene polymer latex, said styrene polymer being non-film forming and comprising at least 80 percent styrene, with a water-soluble ether compatible with said polymer and having a boiling point above about 85*C, said ether being employed in an amount sufficient to form a dispersion containing from about 5 to about 30 weight percent of said polymer, b. forming said dispersion into a shaped article, and c. heating said dispersion in said shaped article at a temperature of from about 80*C to about 120*C, said temperature being lower than the boiling point of said ether, for about 1 minute to about 60 minutes.
Claim 12
Dependent Claim
10 words
The process of claim 7 wherein said polymer is polystyrene.
Claim 13
Dependent Claim
19 words
The process of claim 7 wherein said polymer is a copolymer of styrene and a monomer copolymerizable with styrene.
Claim 14
Dependent Claim
14 words
The process of claim 7 wherein said ether is removed from said heated dispersion.
Claim 15
Dependent Claim
10 words
The process of claim 10 wherein said polymer is polystyrene.
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |