Patent US4328319A successfully refreshed from Google Patents.
US4328319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing propellant compositions forming foamed structures containing open and/or closed cells
Assignee: RESTECH RESEARCH A Ltd PARTNERSHIP LP
•
Filing: 1980-10-27
•
Granted: 1982-05-04
•
Expires: 2000-10-27
Abstract
Abstract A process is provided for preparing propellant compositions including a film-forming synthetic polymer that are capable of forming foamed structures containing open and/or closed cells, which may optionally contain a material which is deposited in the pores and/or walls of the structure as the structure is formed, which comprises coating the synthetic polymer in particulate form with an inert solid material insoluble in the propellant and in solutions of the synthetic resin the propellant at atmospheric temperature; and then adding the propellant and dissolving the synthetic polymer in the propellant. The process is of particular application for preparing such synthetic polymer-propellant compositions in situ in closed containers capable of withstanding an internal pressure sufficient to keep the propellant in the liquid phase at atmospheric temperature, and when the composition is withdrawn from the container to atmospheric pressure, the propellant volatilizes rapidly and a foamed structure is formed within a few seconds.
Inventors
- 👤 Lloyd I. Osipow
- 👤 J. George Spitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:17
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; A; A61; A61K; A61K8/00; A61K8/02; A61K8/04; A61K8/046; A61K8/18; A61K8/72; A61K8/73; A61K8/731; A61K8/81; A61K8/8135; A61K8/8141; A61K8/8152; A61Q; A61Q1/00; A61Q1/14; A61Q19/00; A61Q19/10; C08J2207/00; C08J2207/04; Y; Y10; Y10S; Y10S264/00; Y10S264/16; Y10S264/17
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
75 words
A process for preparing propellant compositions including a film-forming synthetic polymer that are capable of forming foamed structures containing open and/or closed cells which comprises coating the synthetic polymer in particulate form with an inert solid material insoluble in the propellant and in solutions of the synthetic resin in the propellant at atmospheric temperature; and then adding the propellant and dissolving the synthetic polymer in the propellant, thereby forming a synthetic polymer-propellant composition in situ.
Claim 2
Dependent Claim
75 words
A process for preparing propellant compositions including a film-forming synthetic polymer that are capable of forming foamed structures containing open and/or closed cells which comprises coating the synthetic polymer in particulate form with an inert solid material insoluble in the propellant and in solutions of the synthetic resin in the propellant at atmospheric temperature; and then adding the propellant and dissolving the synthetic polymer in the propellant, thereby forming a synthetic polymer-propellant composition in situ.
Claim 3
Dependent Claim
61 words
A process according to claim 1 in which the process is carried out in a closed container capable of withstanding an internal pressure sufficient to keep the propellant in the liquid phase at atmospheric temperature, and when the composition is withdrawn from the container to atmospheric pressure, the propellant volatilizes rapidly and a foamed structure is formed within a few seconds.
Claim 4
Dependent Claim
33 words
A process according to claim 1 in which the synthetic polymer-propellant composition includes an additive which is deposited in the pores and/or walls of the foamed structure as the foamed structure is formed.
Claim 5
Dependent Claim
33 words
A process according to claim 3 in which the additive is in liquid form as a solution in a separate liquid phase that is itself dispersed in the propellant phase of the composition.
Claim 6
Dependent Claim
13 words
A process according to claim 3 in which the additive is an antiperspirant.
Claim 7
Dependent Claim
14 words
A process according to claim 3 in which the additive is an aqueous solution.
Claim 8
Dependent Claim
20 words
A process according to claim 3, in which the additive is in liquid form as a solution with the propellant.
Claim 9
Dependent Claim
20 words
A process in accordance with claim 3 in which the additive is in liquid form as dispersed in the propellant.
Claim 10
Dependent Claim
31 words
A process in accordance with claim 3, in which the additive is in liquid form as a separate liquid phase that is itself dispersed in the propellant phase of the composition.
Claim 11
Dependent Claim
26 words
A process in accordance with claim 9, in which the additive is an aqueous solution that is itself dispersed in the propellant phase of the composition.
Claim 12
Dependent Claim
33 words
A process according to claim 3 in which the additive is in liquid form as a dispersion in a separate liquid phase that is itself dispersed in the propellant phase of the composition.
Claim 13
Dependent Claim
16 words
A process according to claim 11 in which the separate liquid phase is an aqueous phase.
Claim 14
Dependent Claim
23 words
A process according to claim 3 in which an organic liquid solvent for the polymer is present in solution in the propellant phase.
Claim 15
Dependent Claim
21 words
A process according to claim 13 in which the organic solvent is a lower alkanol having up to three carbon atoms.
Claim 16
Dependent Claim
14 words
A process according to claim 3 in which the propellant is a hydrocarbon propellant.
Claim 17
Dependent Claim
92 words
A process according to claim 3 wherein the liquid propellant is inert to the synthetic polymer; wherein the additive is in liquid or solid form at atmospheric temperature and pressure in an amount in excess of any solubility of the additive in the polymer in the absence of the propellant, the additive being substantially inert to the synthetic polymer and to the propellant, the foamed structure being in a shaped form for immediate use as a pad from which the additive can be removed in liquid form by compression of the pad.
Claim 18
Dependent Claim
66 words
A process according to claim 3 in which the composition upon rapid volatilization of the propellant at atmospheric temperature and pressure forms a foamed polymeric structure which immediately is nonsticky, coherent, voluminous and self-supporting, which contains the additive, and which is in a shaped form for immediate use as a pad, from which the additive can be removed in liquid form by compression of the pad.
Claim 19
Dependent Claim
20 words
A process according to claim 17 in which the composition contains up to 50% by weight of the synthetic polymer.
Claim 20
Dependent Claim
54 words
A process according to claim 18 in which the polymer is dissolved in a liquid comprising, in addition to the liquid propellant, a solvent which has a boiling point above 45° F., said solvent being present in an amount not exceeding three times the weight of polymer and not exceeding the weight of propellant.
Claim 21
Dependent Claim
13 words
A process according to claim 18 in which the polymer is polyisobutyl methacrylate.
Claim 22
Dependent Claim
25 words
A process according to claim 18 in which the synthetic polymer is selected from the group consisting of cellulose derivatives, vinyl polymers and vinyl copolymers.
Claim 23
Dependent Claim
17 words
A process according to claim 21 in which the vinyl polymer is a methacrylate polymer or copolymer.
Claim 24
Dependent Claim
14 words
A process according to claim 21 in which the vinyl polymer is polyisobutyl methacrylate.
Claim 25
Dependent Claim
37 words
A process according to claim 3 in which the additive is selected from the group consisting of antimicrobial agents, coating compositions, fungistatic agents, fungicidal agents, abrasives, detergents, antibiotics, antiperspirants, medicaments, silicone oils, mineral oils and vegetable oils.
Claim 26
Dependent Claim
17 words
A process according to claim 1 in which the inert solid material is not wetted by water.
Claim 27
Dependent Claim
48 words
A process according to claim 25 in which the inert solid material is selected from the group consisting of water-soluble or water dispersible gums; water soluble or water-dispersible cellulose ethers and esters; hydrocarbon waxes; polyoxyalkylene glycols and glycol ethers; water-insoluble metallic soaps; and finely-divided fillers for synthetic polymers.
Claim 28
Dependent Claim
16 words
A process according to claim 26 in which the coating material is a water-insoluble metallic soap.
Claim 29
Dependent Claim
41 words
A process according to claim 25 in which the composition is packaged in a 4 to 12 oz aerosol container and the coating material has a particle size below about 50 microns, to avoid clogging of valves in the aerosol container.
Claim 30
Dependent Claim
25 words
A process according to claim 1 in which the coating material is applied to the particles of polymer by blending the two particulate materials together.
Claim 31
Dependent Claim
50 words
A process according to claim 1 in which the coating material is applied to the particles of polymer as a solution or dispersion of the coating material in a liquid solvent or suspending agent in which the coating material is insoluble, but which is not a solvent for the polymer.
Claim 32
Dependent Claim
42 words
A process according to claim 1 in which the polymer particles are coated with a liquid which is inert to and insoluble in the polymer, and then the coating material applied, the liquid bonding the coating material to the particles of polymer.
Claim 33
Dependent Claim
32 words
A process according to claim 31 in which the liquid is selected from the group consisting of mineral oil, vegetable oil, silicone oil, propylene glycol, glycerine, water, and aqueous solutions of surfactants.
Claim 34
Dependent Claim
30 words
A process according to claim 31 in which the liquid is in an amount within the range from 0 to about 100 parts per 100 parts by weight of polymer.
Claim 35
Dependent Claim
29 words
A process according to claim 1 in which the amount of coating material is within the range from about 2% to about 40% by weight of the polymer particles.
Claim 36
Dependent Claim
29 words
A process according to claim 1 in which the amount of coating material is within the range from about 5% to about 20% by weight of the polymer particles.
Claim 37
Dependent Claim
26 words
A process according to claim 1 in which the particle size of the polymer particles is within the range from about 50 to about 2000 microns.
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) | 1985-05-03 | 1985-11-02 | 1986-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-03 | 1989-11-02 | 1990-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-03 | 1993-11-02 | 1994-05-04 | $7700.00 | Window Closed / Lapsed |