Branched hydroxy-terminated aliphatic polyethers

Details Branched hydroxy-terminated aliphatic polyethers Branched hydroxy-terminated aliphatic polyethers

C - Chemistry, Metallurgy

08

G

402/254, 260/590

C08G 65/32 (2006.01) C08G 65/24 (2006.01) C08G 65/325 (2006.01)

Patent

CA 1300171

ABSTRACT The invention disclosed is a process for the preparation of branched hydroxy -terminated aliphatic polyethers having alkyl azide substituents, having a structural formula Image G = GAP unit Image n1 = number of GAP units in segment 1 n2 = number of GAP units in segment 2 ns = number of GAP units in segment s s = total number of segments in the molecule n = total degree of polymerization (total number of GAP units) n = (n1 + n2 + n3 + n4 ...... + ns) = Image 5 ? n ? 400, and a molecular weight of about 500 to 40,000, and a process for the preparation thereof which comprises the single step of reacting a solid rubbery polyepichlorohydrin (PECH) of molecular weight of about 0.5-5.0 x 106 with epichlorohydrin monomer (ECH) and an ionic azide selected from the group consisting of sodium azide, lithium azide and potassium azide, in a suitable organic solvent at elevated temperature, while agitating. According to a further aspect of the invention, the molecular weight of the polyether product may be controlled by adjusting the weight ratio of ECH:PECH, while maintaining a weight ratio of ionic azide: (ECH + PECH) of about 1:1.

571721

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