Low temperature injection molding of polyarylene sulfide compositions
AssigneeTicona LLC
InventorsRong Luo, Xinyu Zhao
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Abstract
A method for injection molding a thermoplastic composition that contains a polyarylene sulfide and an aromatic amide oligomer is provided. Due to the improved crystallization properties imparted by the oligomer, the present inventors have discovered that the thermoplastic composition can be molded at lower temperatures to still achieve the same degree of crystallization. In addition to minimizing the energy requirements for the molding operation, such low mold temperatures may be accomplished using heating mediums that are less corrosive and expensive than some conventional techniques.
Claims22
A method for injection molding a thermoplastic composition, the method comprising:
- injecting a thermoplastic composition into a mold cavity, wherein the thermoplastic composition comprises a polyarylene sulfide and aromatic amide oligomer;
- cooling the thermoplastic composition within the mold cavity at a mold temperature of from about 50° C. to about 120° C., wherein the normalized cooling ratio is from about 0.2 to about 8 second per millimeter;
- and
- ejecting the molded part from the mold cavity.
The method of c aim 1, wherein the oligomer is N1,N4-diphenylterephthalamide.
Dependencies are inferred from the claim text.