Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Patent
1982-07-09
1988-01-12
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
528 52, 528 59, 528 57, 528 85, 524726, 524770, 524875, 21050021, C08G 1808, C08G 1818
Patent
active
047192771
ABSTRACT:
In a process for the production of linear segmented polyurethane by simultaneous reaction of macrodiols, low-molecular diols as chain-lengthener and aromatic diisocyanate, in a solvent in the presence of catalyst, and in the presence of catalytic amounts of a magnesium or calcium salt, an aromatic carboxylic acid macrodiol, monomeric, lower-molecular diol and aromatic diisocyanate are reacted, the macrodiol being used in such amounts as to adjust in the prepared polyurethane a weight ratio of soft segment to hard segment of about 4:1 to 1:4. Preferred embodiments include reaction at temperature from about 70.degree. to 120.degree. C.; use of an inert solvent; and having the concentration of starting material amount to about 10-40% by weight relative to the mixture of starting material and solvent. Also provided are polyurethanes obtained according to this process, having a molecular non-uniformity from 2 to 7. Preferred embodiments include that the polyurethane have an average molecular weight from 60,000 to 250,000. The polyurethanes are useful for the production of membranes, specifically those to be used for sterile filtration or blood oxygenation.
REFERENCES:
patent: 3664979 (1972-05-01), Tanomura et al.
patent: 3769245 (1973-10-01), Stewart et al.
patent: 4148734 (1979-04-01), Hilterhaus et al.
Behnke Joachim
Josefiak Christoph
Akzo NV
Foelak Morton
Moore M. L.
Striker Michael J.
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