Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1992-09-24
1994-12-06
Kight, III, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528324, 528325, 5283291, C08G 6926, C08G 6936
Patent
active
053711742
ABSTRACT:
The invention relates to a process for the production of high-molecular-weight polytetramethylene adipamide from equivalent amounts of 1,4-diaminobutane and adipic acid at lower pressures. By supplying 1,4-diaminobutane at an advanced stage of the polycondensation a first polycondensate is obtained that can be extruded very well and that can be aftercondensed in the solid phase to obtain a product with a high molecular weight within a short time. Because of this a substantial overall gain in time is realized. It even appears to be possible to prepare a first polycondensate with a relative viscosity that is high enough for the polycondensate to be further processed into shaped objects.
The polycondensation can be carried out both in the melt and in solution.
The diaminobutane can be supplied both via the liquid and via the vapour phase.
REFERENCES:
patent: 4567249 (1986-01-01), Fox et al.
patent: 4983718 (1991-01-01), Blackmon et al.
patent: 4994550 (1991-02-01), Pipper et al
patent: 5030709 (1991-07-01), Pipper et al.
de Goede Elisabeth
Knape Petronella M.
Warnier Jean M. M.
DSM N.V.
Hampton-Hightower P.
Kight III John
LandOfFree
Process for the production of polytetramethylene adipamides does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for the production of polytetramethylene adipamides, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production of polytetramethylene adipamides will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-215333