Heat-stable cellular materials
US4016114A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1976 |
| Grant date | Apr 5, 1977 |
| Priority date | — |
| Expiry date | Jun 14, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2379/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A cellular material is disclosed based on a polymer with imide groups, characterized in that it is obtained by heating a mixture comprising: PA1 A. a bis-maleimide of the formula ##STR1## in which the symbol B represents a phenylene radical or a radical of the formula ##STR2## where T represents --CH.sub.2 --, --O-- or --SO.sub.2 --; b. a furfuraldehyde derivative of the formula EQU .SIGMA.-- R.sub.1 -- CO -- R.sub.1 --.SIGMA.' in which the symbol .SIGMA. represents a radical of the formula ##STR3## and the symbols R.sub.1 represent a valency bond or a --CH=CH-- group, and the symbol .SIGMA.' represents a radical .SIGMA., an aliphatic, cycloaliphatic or aromatic monovalent radical R containing up to 12 carbon atoms, or a --R'--CO--R" radical, where R' represents an aliphatic, cycloaliphatic or aromatic divalent radical containing up to 12 carbon atoms and R" represents a monovalent radical R or a radical .SIGMA.; and PA1 C. a blowing agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.