Polyamide composition and method of producing goods
AssigneeE. I. Du Pont de Nemours and Company
InventorTsunao Kenmochi
Life of this patent
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Abstract
Certain polyamide resin compositions make it possible to shorten the injection molding processing cycle for polyamide resins. The polyamide resin compositions are obtained by adding an external lubricant to polyamide resin granules composed of from 55 to 85% by weight of polyamide resin, 10 to 40% by weight of filler, and 0.3 to 2.0% by weight of at least one type of higher fatty acid ester type internal lubricant selected from among esters of higher alcohols and higher fatty acids and higher fatty acid partial esters of polyhydric alcohol compounds.
Claims6
A process for preparing a coated polyamide resin pellet for use in injection molding, comprising
- providing polyamide resin pellets comprising from 55 to 85% by weight of a polyamide resin, 10 to 40% by weight of a filler, and 0.3 to 2.0% by weight of an internal lubricant selected from the group consisting of (a) esters of higher alcohols and higher fatty acids, and (b) partial esters of polyhydridic alcohols and higher fatty acids, and
- coating the pellet surface with from about 0.3 to 3.0% by weight, in relation to the polyamide resin pellets, of an external lubricant.
In a process for preparing injection molded polyamide parts by providing polyamide resin pellets comprising polyamide resin and a filler, plasticizing the polyamide resin pellets and injection molding the plasticized polyamide resin pellets, wherein the improvement comprises
- providing polyamide resin pellets which exhibit improved plasticization properties comprising 55 to 85% by weight of a polyamide resin, 10 to 40% by weight of a filler, and 0.3 to 2.0% by weight of an internal lubricant selected from the group consisting of (a) esters of higher alcohols and higher fatty acids, and (b) partial esters of polyhydric alcohols and higher fatty acids, and
- coating the polyamide resin pellets with from about 0.3 to 3.0% by weight, in relation to the polyamide resin pellets, of an external lubricant prior to plasticizing the polyamide resin pellets.
Dependencies are inferred from the claim text.