US3891577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing vesiculated polymers
Assignee: Dulux Australia Ltd
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Filing: 1970-12-01
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Granted: 1975-06-24
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Expires: 1990-12-01
Abstract
Abstract A process of preparing vesiculated polymer by converting to solid polymer a liquid medium in which is dispersed particles of a second polymer swollen by a liquid swellant, the swellant then being removed to provide vesicles in the solid polymer. Granular vesiculated polymer may be prepared by carrying out the process on a liquid medium which is itself pre-dispersed in a suspending liquid in which it is insoluble.
Inventors
- 👤 Robert William Kershaw
- 👤 Frederick John Lubbock
- 👤 Livia Polgar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:17
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C09; C09D; C09D7/00; C09D7/40; C09D7/42
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
75 words
A PROCESS OF PREPARING VESICULATED POLYMER WHICH COMPRISES CONVERTING TO SOLID NON-POROUS POLYMER THE LIQUID MEDIUM OF A DISPERSION IN WHICH PARTICLES OF ANOTHER POLYMER ARE DISPERSED, THE DISPERSED PARTICLES BEING SWOLLEN BY A LIQUID SWELLANT, WHEREBY THERE IS FORMED SOLID POLYMER CONTAINING SAID SWOLLEN POLYMER PARTICLES, AND THEREAFTER REMOVING AT LEAST PART OF SAID SWELLANT FROM SAID SWOLLEN POLYMER PARTILCES TO FORM A PLURALITY OF ISOLATED VESICLES WITHIN A MATRIX OF SOLID NON-POROUS POLYMER.
Claim 2
Dependent Claim
75 words
A PROCESS OF PREPARING VESICULATED POLYMER WHICH COMPRISES CONVERTING TO SOLID NON-POROUS POLYMER THE LIQUID MEDIUM OF A DISPERSION IN WHICH PARTICLES OF ANOTHER POLYMER ARE DISPERSED, THE DISPERSED PARTICLES BEING SWOLLEN BY A LIQUID SWELLANT, WHEREBY THERE IS FORMED SOLID POLYMER CONTAINING SAID SWOLLEN POLYMER PARTICLES, AND THEREAFTER REMOVING AT LEAST PART OF SAID SWELLANT FROM SAID SWOLLEN POLYMER PARTILCES TO FORM A PLURALITY OF ISOLATED VESICLES WITHIN A MATRIX OF SOLID NON-POROUS POLYMER.
Claim 3
Dependent Claim
79 words
A process of preparing vesiculated polymer in granular form which comprises dispersing, in a suspending liquid, a liquid medium in which are dispersed particles of a first polymer, said first polymer particles being swollen by a liquid swellant, converting said liquid medium to solid, non-porous granules of a second polymer, and at least partially removing said swellant from said swollen polymer particles to form in said granules a plurality of isolated vesicles within a matrix of solid non-porous polymer.
Claim 4
Dependent Claim
79 words
A process of preparing vesiculated polymer in granular form which comprises dispersing, in a suspending liquid, a liquid medium in which are dispersed particles of a first polymer, said first polymer particles being swollen by a liquid swellant, converting said liquid medium to solid, non-porous granules of a second polymer, and at least partially removing said swellant from said swollen polymer particles to form in said granules a plurality of isolated vesicles within a matrix of solid non-porous polymer.
Claim 5
Dependent Claim
35 words
A process according to claim 1 in which the liquid medium is a solution of a polymer in a solvent and is converted to solid polymer by removal therefrom of the solvent for the polymer.
Claim 6
Dependent Claim
24 words
A process according to claim 1 in which the liquid medium comprises polymerisable material which is converted to solid polymer by a polymerisation reaction.
Claim 7
Dependent Claim
23 words
A process according to claim 4 in which the liquid medium is converted to solid polymer by a polymerisation reaction producing cross-linked polymer.
Claim 8
Dependent Claim
24 words
A process according to claim 2 in which the liquid medium comprises polymerisable material which is converted to solid polymer by a polymerisation reaction.
Claim 9
Dependent Claim
23 words
A process according to claim 6 in which the liquid medium is converted to solid polymer by a polymerisation reaction producing cross-linked polymer.
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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |