Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1997-11-03
2000-05-09
Hampton-Hightower, P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528310, 528322, 528363, 528422, 525418, 524765, 524779, 524781, 524785, 424DIG16, C08G 7300
Patent
active
060605804
ABSTRACT:
The invention relates to a star-shaped branched polyamide that has a high thermal stability and can be produced in existing production facilities for the corresponding linear polyamide. This is achieved by allowing the polyamide branches, at least three, to be formed from a multifunctional core having functional groups chosen from the group comprising amine and carboxyl groups, the amine or carboxyl groups being bound to an acyclic compound in which branching occures, if it is branched, at a carbon atom, or via an acyclic chain to a heterocyclic compound showing point symmetry.
The process for the preparation is carried out under the conditions of the preparation of the corresponding linear polyamide. It proves to be possible to obtain, after shorter polymerization times, a product with mechanical properties that are comparable with those of the linear polyamide after significantly longer polymerization times.
Examples of suitable multifunctional nuclei are 2,4,6-trisaminocaproic acid-1,3,5-triazine and 4-aminomethyl-1,1-octanediamine.
REFERENCES:
patent: 5530092 (1996-06-01), Meijer
patent: 5610268 (1997-03-01), Meijer et al.
patent: 5698662 (1997-12-01), Stoelwinder et al.
Chemical Engineering News Dendrimers Fundamental Studies Suggest Unique Applications, pp. 28-30, Sep. 27, 1997, Stephen C. Stinson.
J. Am. Chem. Soc. 70, 2709-18 (Aug. 1948), G. R. Schaefgen et al "Synthesis of Multichain Polymers & Investigation of their Viscosities".
Chem. Mater. Sep./Oct., 1992, 4, pp. 1000-1004, G. M. Wara Komski, "Synthesis & Properties of Star-Branched Nylon 6".
Aberson Rene
de Brabander-van den Berg Ellen M. M.
Nijenhuis Atze J
Serne Martien
DSM N. V.
Hampton-Hightower P.
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