Studies on Synthetic Leather Sheet of Polyamide:Effects of Paste Composition, Polymerization Degree of Polyamide and Solidifying Conditions on Leather Sheet Properties

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Effects of three remarkable factors liable to affect various properties of the leather sheet prepared synthetically from polyamide, i. e. the paste composition, polymerization degree of the polyamide used and solidifying conditions were studied. Their relations with the apparent density, tensile strength and elongation at the breaking point are specially investigated and led to the following conclusion: 1) The strength of a leather sheet increases according as the apparet density increases. 2) The apparent density of a leather sheet is largely affected by the working conditions under which methanol and CaCl2 are removed off from the paste, while it is hardly affected by the paste composition. 3) The strength of a leather sheet increases to a certain extent by using a polyamide having a higher polymerization degree. 4) The ideal thickness obtainable of leather sheet in this system is assumed to be about 0.4mm, but the best possible strength obtainable is observed to be only 30-40% of that of the ideal sheet due to various defects discussed in the undergoing derscription.
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