C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/192
C08G 63/12 (2006.01) C08G 63/16 (2006.01) C08G 63/20 (2006.01) C08G 63/42 (2006.01) C08G 63/58 (2006.01) C08L 67/00 (2006.01)
Patent
CA 1279433
SKP:833 NARROW MOLECULAR WEIGHT POLYESTER OLIGOMERS AND METHOD OF PREPARATION Astract Or the Disclosure A polyester composition having an average molecular weight of greater than 500 comprising a most prevalent compound having a main polyester chain containing at least 17 and fewer than 52 carbon atoms and at least 6 and fewer than 18 oxygen atoms, at least 52 weight percent of the molecules of said composition having a molecular weight within 50% of the average molecular weight of the composition. The polyester composition desirably contains at least 1.6 equivalents of unreacted hydroxy groups or at least 1.6 equivalents of unreacted carboxy groups per mole. The composition contains at least four equivalents of ester links in the main chains of the molecules per mole. The composition of the present invention is obtained by the method, of the invention wherein alternating series of reactions are each driven essentially to completion where the final molecule of each reaction provides the only available reaction site for the next alternate monomer reaction. The reactions used are the reaction of an anhydride with a hydroxyl to give an ester and a carboxyl group and the reaction of an oxirane group with a carboxyl to give an ester and a hydroxyl group. To start the alternating reaction sequence either a polyol (to react with anhydride) or a polycarboxylic acid (to react with an oxirane) is used. 51
530685
Kirby Eades Gale Baker
Nl Spencer Kellogg Inc.
Reichhold Chemicals Inc.
Williams Roy C.
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