Patent US4733919B1 successfully refreshed from Google Patents.
US4417002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foam manufacture
Assignee: KABEL-UND-GUMMIWERKE AG MALMEDYER STRASSE B-4700 EUPEN BELGIUM
•
Filing: 1982-07-07
•
Granted: 1983-11-22
•
Expires: 2002-07-07
Abstract
Abstract A carboxylic acid or carboxylate is reacted with an isocyanate to produce gas which is used to give a blowing action in the manufacture of a foam plastics material, especially foam polyurethane. Preferably formic acid or a formate is used.
Inventors
- 👤 Bernhard Liessem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:25
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/149; C08J9/06; C08J9/08; C08J9/142; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
48 words
A method of manufacturing foam material in which such material is formed in the presence of a blowing agent, characterised in that the blowing agent comprises at least one substance, selected from formic acid and salts of formic acid, which is reacted with an isocyanate to liberate gas.
Claim 2
Independent Claim
48 words
A method of manufacturing foam material in which such material is formed in the presence of a blowing agent, characterised in that the blowing agent comprises at least one substance, selected from formic acid and salts of formic acid, which is reacted with an isocyanate to liberate gas.
Claim 3
Dependent Claim
25 words
A method according to claim 1, characterised in that said blowing agent comprises at least one salt of formic acid with a weak organic base.
Claim 4
Dependent Claim
20 words
A method according to claim 2, characterised in that said weak organic base is selected from hydrazine, triethylamine, dimethylbenzylamine, triethylenediamine.
Claim 5
Dependent Claim
26 words
A method according to claim 1, characterised in that said acid and/or carboxylate blowing agent is used in conjunction with at least one other blowing agent.
Claim 6
Dependent Claim
43 words
A method according to claim 4, characterised in that said other blowing agent comprises at least one substance selected from the group consisting of: water which reacts with an isocyanate and a volatile, inert organic compound which boils during the foam manufacturing process.
Claim 7
Dependent Claim
26 words
A method according to claim 1, characterised in that it is applied to the manufacture of foam polyurethane by reaction of a polyol with an isocyanate.
Claim 8
Dependent Claim
31 words
A method according to claim 6, characterised in that said isocyanate used for reaction with the carboxylic acid/blowing agent is the same substance as that used for reaction with the polyol.
Claim 9
Dependent Claim
35 words
A method according to claim 6, characterised in that said acid/carboxylate blowing agent comprises formic acid and this is present in the range 0.05 to 5.0 parts per hundred parts by weight of the polyol.
Claim 10
Dependent Claim
51 words
Polyurethane foam made by reaction of a polyol with an isocyanate in the presence of a blowing agent characterised in that said blowing agent comprises at least one substance selected from the group consisting of formic acid and salts of formic acid, which substance reacts with said isocyanate to liberate gas.
Claim 11
Dependent Claim
51 words
Polyurethane foam made by reaction of a polyol with an isocyanate in the presence of a blowing agent characterised in that said blowing agent comprises at least one substance selected from the group consisting of formic acid and salts of formic acid, which substance reacts with said isocyanate to liberate gas.
Claim 12
Dependent Claim
20 words
A method according to claim 1, characterized in that said blowing agent comprises a mixture of salts of formic acid.
References Cited (Backward Citations)
US2932621A
Cited
US3087900A
Cited
US3567663A
Cited
US3663465A
Cited
GB1482213A
Cited
GB1453258A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |