Process for the manufacture of heat resistant multicellular materials
US4057518A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 17, 1975 |
| Grant date | Nov 8, 1977 |
| Priority date | — |
| Expiry date | Apr 17, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2379/08
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Multicellular materials having excellent heat-resistance are provided by preparing granules of PA1 1. a prepolymer obtained from: PA2 A. a product containing an imide group, which is PA3 A. a bis-imide of the formula: ##STR1## in which D represents a radical of the formula: ##STR2## WHEREIN Y represents H, CH.sub.3 or Cl, m is 0 or 1, and A represents a divalent organic radical containing 2 to 30 carbon atoms, or PA3 B. a mixture comprising a bis-imide of formula (I) and a mono-imide of the formula: ##STR3## in which D is as defined above and R represents a hydrogen atom or a monovalent organic radical containing 1 to 20 carbon atoms, and PA2 B. an amine product which is PA3 A. one or more polyamines containing from 2 to 5 primary or secondary amino groups, at least one of these groups being primary, or PA3 B. a mixture comprising one or more polyamines as defined under a) and one or more primary and/or secondary monoamines and/or one or more secondary polyamines, PA1 2. a pore-forming agent and PA1 3. a cell-forming agent, the degree of expansion (as hereinbefore defined) of which is a maximum of 90%, placing these granules in a mould, and effecting complete expansion and thermo-s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.