Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1975-02-26
1976-07-13
Jacobs, Lewis T.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 28R, 260 4575R, 260 4585R, 260829, 260184R, 260873, C08L 9300
Patent
active
039692949
ABSTRACT:
Thermally stabilized thermoplastic hot melt adhesive compositions which comprise, based on the total thermoplastic components, (A) 1 to 99 percent by weight of thermoplastic segmented copolyester elastomer consisting essentially of a multiplicity of recurring short chain ester units and long chain ester units joined through ester linkages, said short chain ester units amounting to 15 to 75 percent by weight of said copolyester and being of the formula ##EQU1## and said long chain ester units amounting to 25 to 85 percent by weight of said copolyester and being of the formula ##EQU2## wherein R is the divalent radical remaining after removal of the carboxyl groups from a dicarboxylic acid having a molecular weight of less than 350, D is the divalent radical remaining after removal of the hydroxyl groups from organic diol having a molecular weight of less than 250, and G is the divalent radical remaining after removal of the terminal hydroxyl groups from long chain glycol having an average molecular weight of 350 to 6000, said copolyester having a melt index of less than 150 and a melting point of at least 90.degree.C.; (B) 1 to 99 percent by weight of low molecular weight thermoplastic resin which forms compatible mixtures with the segmented copolyester, is thermally stable at 150.degree.C., and has a melt viscosity of less than 10,000 centipoises at 200.degree.C.; stabilized with (C) 5 to 30 percent by weight, preferably 8.0 to 20 percent by weight, based on the weight of elastomer and resin, of an alkaline earth oxide, in combination with (D) 0.05 to 5.0 percent by weight of a carboxylic compound of an aromatic or aliphatic compound having at least two carboxylic acid groups or anhydrides thereof. Preferably (C) is calcium oxide and (D) is pyromellitic dianhydride.
REFERENCES:
patent: 3832314 (1974-08-01), Hoh et al.
E. I. Du Pont de Nemours and Company
Jacobs Lewis T.
Parker William E.
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