Novel polymeric foams and foaming compositions
US4612332A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 1985 |
| Grant date | Sep 16, 1986 |
| Priority date | — |
| Expiry date | Dec 12, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2333/26
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Surfactant-free stable aqueous foams may be produced by water soluble copolymers of acrylamide and N-alkylacrylamide with chain lengths greater than or equal to 6 carbons. Additionally, these polymers may contain an anionic monomer, such as a monovalent salt of acrylic acid. These copolymers and terpolymers are added to water or brine at a concentration of 0.005 to 2 parts per 100 of solvent. When the resulting solutions are subjected to intensive mixing with the addition of air or other gases, such as nitrogen or carbon dioxide, high quality, persistent foams are formed. These foams are formed at relatively low polymer concentrations without added surfactants. They have good high temperature stability and excellent salt tolerance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.