C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/7828
C08L 77/12 (2006.01) C08G 69/44 (2006.01) C08K 3/32 (2006.01) C08K 5/00 (2006.01) C08K 5/50 (2006.01)
Patent
CA 1039892
ABSTRACT OF THE DISCLOSURE: Known method of producing polyester amides, if the starting material includes condensed-in hexamethylene diammonium adipate (AH salt), result in the formation of a skin of infuse- ble and insoluble material on the surface of the polyester amide melt when the product is kept in the molten condition in open, heated storage containers. When additional polyester amide is added to the melt, the skin is easily torn and passes into the interior of the melt in the for of solid or jelly-like pieces. If the pieces of skin get into the applicator feed lines and into the applicators themselves, the uniform application of the product is either impeded or shut off completely, resulting in inconve- nient and expensive cleaning operations. While it is known that polyester amides can be produced without the formation of a skin, such processes do not include the use of AH salt. The use of the AH salt, however, is an advantage in that it increases the rate of crystallization of the polyester amide, as well as increasing the number of glueing operations per unit of time. According to the subject invention, the method of stabilizing polyester amides containing AH salt comprises the use in combination of: phospho- rous acid or an alkyl or aryl ester thereof, or both; triphenyl phosphine; and sterically hindered phenols; in an overall amount of preferably 0.01 to 0.5% by weight in relation to the overall amount of polyester-amide-forming initial substances.
198207
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