Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1976-07-19
1978-11-28
Jacobs, Lewis T.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 37R, 260 37AL, 260 37PC, 260 40R, 260 4246, C08L 7700, C08L 7102
Patent
active
041275543
ABSTRACT:
A method for manufacturing molded thermoplastic products formed of crystallizable plastic material containing reinforcing elements. The reinforcing elements are added to the molten thermoplastic material and are capable of being moved by the front of recrystallization during growth of the crystallites in the thermoplastic material so that the reinforcing elements are disposed in the interspherulitic zones between crystallites when the crystals have been fully grown. The reinforcing elements are selected so that they have dimensions smaller than the dimensions of the crystallites of thermoplastic material, they are present in an amount of 0.05 to 5% by weight based on the thermoplastic material and they have a shape favorable to the transfer of mechanical stresses and, in addition, the boundary of the reinforcing element particles is sufficiently defined so that the particles can be moved by the growing front of recrystallization of the spherulites. The reinforcing elements may be insoluble in the molten semi-plastic material. The reinforcing particles may be preferentially crystallized from the molten thermoplastic material if soluble or partially soluble therein or, may be grown on a supporting material insoluble in the molten plastic.
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Jenkins: Polymer Science, PT. I, North-Holland Pub. Co., pp. 254-267, 275-277, 287-292, 1972.
Ebauches S.A.
Jacobs Lewis T.
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