Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1999-01-15
2000-12-26
Boykin, Terressa M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528176, 528271, C08G 6302
Patent
active
061661694
ABSTRACT:
An aliphatic polyester and/or copolyester, obtained from a polyreaction of at least one monomer from the group comprising lactides, lactones, cyclic carbonates and cyclic anhydrides. To be able to prepare the aliphatic polyester and/or copolyester a reaction mixture is used which contains at least one catalyst of the general formula (M) (X.sub.1, X.sub.2 . . . X), M being a metal selected from the group 3 to 12 of the periodic system (X.sub.1, X.sub.2 . . . X.sub.m) being a substituent selected from one of the families of alkyls, aryls, oxides, carboxylates, halogenides, alkoxides and compounds with elements from group 15 and/or 16 of the periodic system, m being an integer in the range of from 1 to 6, and n being an integer in the range of from 0 to 6, and which also contains a co-catalyst of the general formula (Y) (R.sub.1, R.sub.2 . . . R.sub.q).sub.p, Y being an element selected from the group 15 or 16 of the periodic system. (R.sub.1, R.sub.2 . . . R.sub.q) being a substituent selected from one of the families of the alkyls, aryls, oxides, halogenides, oxyalkyls, aminoalkyls, thiolkyls, phenoxides, aminioaryls, thioaryls, and q and p corresponding to the values for m and n.
REFERENCES:
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patent: 4379914 (1983-04-01), Lundberg
patent: 5378801 (1995-01-01), Reichert et al.
Carriere, F.J., et al. "Polymerization of .beta.-propiolactones by nickel carboxylate/tributylphosphate complexes.sup.a)." Makromol. Chem. 189, No. 4, (1988) pp 717-722.
Dubois, R.J., et al. "Effect of Lewis bases on the ring-opening polymerization of .epsilon.-caprolactone and lactides initiated by aluminum alkoxides." Polymer Preprints, vol. 35, No. 2 (1994) pp 536-537.
Degee, P., et al. "Bulk polymerization of lactides initated by aluminum isopropoxide, 2.sup.a) " Macromol. Chem. Phys., vol. 198, No. 6 (1997), pp 1973-1984.
Watanabe, I., et al. "Catalyst for Preparation of ***lactone*** polymers with good thermal stability." Chemical Abstracts, vol. 122, No. 20 (1995) XP 002044184.
Invention Summary of BE 1008099 dated Jan. 16, 1996.
Degee Philippe
Dubois Philippe
Fritz Hans-Gerhard
Jacobsen Sven
Jerome Robert
Boykin Terressa M.
Brussels Biotech
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