US5264462A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric foams
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1993-03-01
•
Granted: 1993-11-23
•
Expires: 2013-03-01
Abstract
Abstract A method for the preparation of a polymeric foam which comprises vaporising a fluorine-containing ether in the presence of a foamable polymer or the precursors of a foamable polymer.
Inventors
- 👤 Roger J. Hodson
- 👤 Richard L. Powell
- 👤 David Randall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:01
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/143
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
35 words
A method for the preparation of a polymeric foam which comprises vaporising a fluorine-containing ether which contains no other halogen atoms in the presence of a foamable polymer or the precursors of a foamable polymer.
Claim 2
Independent Claim
35 words
A method for the preparation of a polymeric foam which comprises vaporising a fluorine-containing ether which contains no other halogen atoms in the presence of a foamable polymer or the precursors of a foamable polymer.
Claim 3
Dependent Claim
26 words
A method according to claim 1 wherein the fluorine-containing ether has a boiling point in the range from - 50° to 80° C. at 1 bar.
Claim 4
Dependent Claim
22 words
A method according to claim 2 wherein the ether has a boiling point of from -35° to 70° C. at 1 bar.
Claim 5
Dependent Claim
20 words
A method according to claim 1 wherein the fluorine-containing ether comprises a dimethyl ether containing one or more fluorine atoms.
Claim 6
Dependent Claim
16 words
A method according to claim 1 wherein the fluorine-containing ether contains three or more carbon atoms.
Claim 7
Dependent Claim
18 words
A method according to claim 5 wherein the fluorine-containing ether contains at least one hydrogen atom per molecule.
Claim 8
Dependent Claim
17 words
A method according to claim 6 wherein the ether contains two or more hydrogen atoms per molecule.
Claim 9
Dependent Claim
15 words
A method according to claim 7 wherein the ether contains more fluorine than hydrogen atoms.
Claim 10
Dependent Claim
27 words
A method according to claim 6 wherein the ether has at least one hydrogen atom attached to one or both carbon atoms adjacent to the oxygen atom.
Claim 11
Dependent Claim
36 words
A method according to claim 4 wherein the fluorine-containing ether comprises CF 3 3 OCF 3 2 H, CF 3 OCH 2 F, CF 3 3 OCH 3 or CF 3 2 HOCF 3 2 H.
Claim 12
Dependent Claim
67 words
A method according to claim 5 wherein the fluorine-containing ether comprises (CF 3 ) 2 CHOCH 2 F, HCF 2 CF 2 OCH 3 , CF 3 CF 2 OCHF 2 , CHF 2 CF 2 OCHF 2 , CF 3 2 CH 2 OCHF 2 , CF 3 CHFOCHF 2 , CF 2 HCHFOCHF 2 , CF 3 CF 2 OCF 2 CHF 2 or 2,2,3,3-tetrafluoro-oxacyclobutane.
Claim 13
Dependent Claim
29 words
A method according to claim 11 which comprises the step of incorporating a fluorine-containing ether in a foamable polymer or in one or more precursors of a foamable polymers.
Claim 14
Dependent Claim
16 words
A method according to claim 12 which comprises extruding a styrene polymer containing a fluorine-containing ether.
Claim 15
Dependent Claim
20 words
A method according to claim 13 wherein the styrene polymer contains from 5 to 20% by weight of fluorine-containing ether.
Claim 16
Dependent Claim
28 words
A method according to claim 1 which comprises reacting an organic polyisocyanate with a polymeric polyol in the presence of a fluorine-containing ether to form a polyurethane foam.
Claim 17
Dependent Claim
14 words
A method according to claim 15 wherein the organic polyisocyanate comprises a diphenylmethane diisocyanate.
Claim 18
Dependent Claim
22 words
A method according to claim 15 or claim 16 wherein the polymeric polyol has a hydroxyl number of from 200 to 800.
Claim 19
Dependent Claim
19 words
A method according to claim 17 wherein the polymeric polyol has a hydroxyl number of from 300 to 600.
Claim 20
Dependent Claim
19 words
A method according to claim 15 wherein the polymeric polyol has a hydroxyl functionality of from 2 to 8.
Claim 21
Dependent Claim
19 words
A method according to claim 19 wherein the polymeric polyol has a hydroxyl functionality of from 3 to 8.
References Cited (Backward Citations)
GB659251A
Cited
FR1373014A
Cited
GB1193122A
Cited
US3912666A
Cited
US3912665A
Cited
US3912667A
Cited
US3922228A
Cited
US4041148A
Cited
US4263412A
Cited
US4328319A
Cited
US4422877A
Cited
US5137932A
Cited
US4999127A
Cited
US5169873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-22 | 1997-05-24 | 1997-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-22 | 2001-05-24 | 2001-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-22 | 2005-05-24 | 2005-11-23 | $7700.00 | Window Closed / Lapsed |