USE OF A PISTON REACTOR TO IMPLEMENT A PHOSGENATION PROCESS
申请人:Perret Nicolas
公开号:US20110306786A1
公开(公告)日:2011-12-15
A process for phosgenating an amine comprising employing a plug-flow type reactor with internal recycle is disclosed. The process can be continuous, which makes it possible to prepare, in a single stage, a (poly)isocyanate with a good yield, without formation of byproducts and on simplifying the plant in order to carry out the process so as to promote safety.
Macrocyclic module compositions are made from cyclic synthons. The macrocyclic module structures are prepared by stepwise or concerted schemes which couple synthons in a closed ring. The macrocyclic module structures may have a pore of nanometer dimensions.
[EN] SULFONIUM SULFATES, THEIR PREPARATION AND USE<br/>[FR] SULFATES DE SULFONIUM, LEUR PRÉPARATION ET UTILISATION
申请人:BASF SE
公开号:WO2012113829A1
公开(公告)日:2012-08-30
The present invention relates to a heat-curable composition comprising (a) at least one compound which is capable of undergoing cationic polymerization; and (b) at least one sulfonium sulfate selected from compounds of the formulae Ia and Ib where Yn- is a monovalent or divalent anion selected from (1) where n, M, R1 to R10 are as defined in claim 1 and in the description. The present invention also relates to novel sulfonium sulfates of the formulae Ia and Ib, to a process for curing cationically polymerizable material and to the cured material obtained by said process.
A polyimide resin contains repeating structural units represented by formulas (1) and (2), wherein the content of the repeating structural unit represented by formula (2) relative to the total of the repeating structural unit represented by formula (1) and the repeating structural unit represented by formula (2) falls within a specific range and the content of the divalent group represented by the following structural formula (B1) falls within a specific range:
X
1
represents a tetravalent group containing an alicyclic hydrocarbon structure and having a carbon number of from 4 to 22. X
2
represents a tetravalent group containing an aromatic ring and having a carbon number of from 6 to 22. R
1
and R
2
each independently represent a divalent organic group, and the content of the divalent group represented by the following structural formula (B1) relative to the total of R
1
and R
2
is from 80 to 100 mol %: