Method of manufacturing a molded article having good dimensional stability
AssigneeHoechst Celanese Corporation
InventorsYukio Ikenaga, Katsuhiko Takahashi, Tsuneyoshi Okada, Kenji Hijikata, Toshio Kanoe
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Abstract
A laminated sheet comprises a first layer of a melt-phase anisotropy exhibiting thermoplastic polymer, having a negative linear expansion coefficient in the direction of the polymer flow and a second layer having a positive linear expansion coefficient in the direction of the polymer flow, both layers having been laminated one on another in the alternative way, further each layer having a thickness such that the negative linear expansion coefficient of said first layer and the positive linear expansion coefficient of the second layer having been offset against each other.
Claims29
A method for manufacturing an article of superior dimensional stability comprising laminating:
- (a) at least one first layer of a molecularly oriented sheet formed by the melt-processing of a thermoplastic polymer which exhibits an anisotropic melt phase wherein said molecularly oriented sheet exhibits a negative linear thermal expansion coefficient in the direction of the polymer flow during its formation, and
- (b) at least one second layer which exhibits a positive linear thermal expansion coefficient,
- wherein said first and second layers are regulated in thickness so that in the resulting article the respective negative and positive linear thermal expansion coefficients of (a) and (b) are substantially balanced thereby imparting stability to the overall laminate.
A laminated article of superior dimensional stability comprising adjoining bonded layers comprising:
- (a) at least one first layer of a molecularly oriented sheet formed by the melt-processing of a thermoplastic polymer which exhibits an anisotropic melt phase wherein said molecularly oriented sheet exhibits a negative linear thermal expansion coefficient in the direction of the polymer flow during its formation, and
- (b) at least one second layer which exhibits a positive linear thermal expansion coefficient,
- wherein said first and second layers are regulated in thickness so that the respective negative and positive linear thermal expansion coefficients of (a) and (b) are substantially balanced thereby imparting stability to the overall laminate.
Dependencies are inferred from the claim text.