METHOD FOR IMPROVING THE SHELF LIFE OF POLYAMIDE ... | 合法醫療器材資訊網
Amethodisprovidedforimprovingtheshelflifeofpolyamideaciddispersionswhichareusefulaselectrocoatingcompositionsformakingcompositesof ...
The present invention relates to polyamide acid dispersions having improved shelf stability and a method for making such compositions.Prior to the present invention polyamide acid mixtures as shown by Holub et al. U.S. Pat. No. 3,507,765, were useful for making composite structures of polyimide film and metal substrates by effecting the electrodeposition of the polyamide acid onto the metal substrate followed by heating the polyamide acid to the polyimide state.
Experience has shown that aqueous dispersions of polyamide acid can degrade rapidly at ambient temperature i.e. between 25° to 35° C, if they have a sufficient number of chemically combined un-neutralized amide acid units of the formula, ##SPC1##
To provide for at about 0.4 meq of carboxy/g of polyamide acid, where the unsatisfied valence bonds of the un-neutralized amide acid unit of formula (1) can be joined to a monovalent or poly...
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Material Specifications | 合法醫療器材資訊網
METHOD FOR IMPROVING THE SHELF LIFE OF POLYAMIDE ... | 合法醫療器材資訊網
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