US3839241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isocyanate-modified neoprene foam process
Assignee: EIDP Inc
•
Filing: 1973-06-22
•
Granted: 1974-10-01
•
Expires: 1993-06-22
Abstract
Abstract An improved process for the preparation of polyisocyanatemodified neoprene foams, wherein there is added to neoprene latex a nonionic surfactant and an amine having the formula RN(CH2CHR''OH)2, R being methyl or ethyl and R'' being hydrogen or methyl, and adjusting the pH of the latex from more than about 11.5 to about 10.0-11.5. Instead of adding separately the amine and then a pH-lowering acid, it is possible to add both ingredients simultaneously, or to simply add an appropriate amine salt. The resulting foams have excellent wet compression set and excellent cured resilience and load-bearing capacity.
Inventors
- 👤 L Harrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:34
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/30; C08J2311/00; C08J2311/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
70 words
IN A PROCESS FOR MAKING A POLYISOCYANATEMODIFIED FOAM FROM A POLYCHLOROPRENE LATEX, SAID PROCESS INCLUDING THE STEP OF ADJUSTING THE PH OF THE LATEX FROM MORE THAN ABOUT 11.5 TO ABOUT 10.0-11.5, THE IMPROVEMENT OF ADDING TO THE NEOPRENE LATEX, PRIOR TO THE POLYISOCYANATE ADDITION, AT LEAST 0.5 PART OF A NONIONIC SURFACTANT HAVING A HYDROPHILIC-LIPOPHILIC BALANCE OF ABOUT 11-16.5 AND ABOUT 0.5-2.0 PARTS OF AN AMINE HAVING THE FORMULA
Claim 2
Dependent Claim
70 words
IN A PROCESS FOR MAKING A POLYISOCYANATEMODIFIED FOAM FROM A POLYCHLOROPRENE LATEX, SAID PROCESS INCLUDING THE STEP OF ADJUSTING THE PH OF THE LATEX FROM MORE THAN ABOUT 11.5 TO ABOUT 10.0-11.5, THE IMPROVEMENT OF ADDING TO THE NEOPRENE LATEX, PRIOR TO THE POLYISOCYANATE ADDITION, AT LEAST 0.5 PART OF A NONIONIC SURFACTANT HAVING A HYDROPHILIC-LIPOPHILIC BALANCE OF ABOUT 11-16.5 AND ABOUT 0.5-2.0 PARTS OF AN AMINE HAVING THE FORMULA
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein the amine is methyldiethanolamine.
Claim 4
Dependent Claim
10 words
The process of claim 1 wherein the amine is ethyldiethanolamine.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein the latex is a directly polymerized high solids latex.
Claim 6
Dependent Claim
28 words
The improvement of claim 1 wherein the nonionic surfactant is added in an amount of up to about 3 parts by weight per hundred parts of latex solids.
Claim 7
Dependent Claim
19 words
The improvement of claim 1 wherein addition of the amine and pH adjustment are combined into a single step.
Claim 8
Dependent Claim
15 words
The improvement of claim 6 wherein a preformed amine salt is added to the latex.
Claim 9
Dependent Claim
14 words
The improvement of claim 7 wherein the salt is methyldiethanolammonium chloride, or ethyldiethanolammonium chloride.
References Cited (Backward Citations)
US3450649A
Cited
US3627710A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |