Blow Molded Articles and Process For Making Same
First Claim
1. A shaped polymer article comprising:
- a blow molded hollow member including an interior surface and an exterior surface and having a wall thickness between the interior surface and the exterior surface, the hollow member being made from a fiber reinforced polymeric composition comprising on a weight percent basis;
a) a linear polyphenylene sulfide having a melt viscosity of from about 20 Pa·
s to about 500 Pa·
s;
b) reinforcing fibers present in the composition in an amount from about 10% to about 50% by weight;
c) an organosilane coupling agent present in the composition in an amount from about 0.1% to about 2% by weight;
d) a reactive impact modifier reactive with the organosilane coupling agent, the reactive impact modifier being present in an amount from about 0.5% to an upper limit whereby the shaped article exhibits a DTUL of at least 200°
C. and a low shear melt viscosity measured at 1 s−
1 of from 15,000 Pa·
s to 85,000 Pa·
s at 310°
C. measured with a Kayaness capillary rheometer.
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Accused Products
Abstract
Blow molded articles are made from a polymeric composition containing a polyphenylene sulfide resin. The composition can further contain a reinforcing agent, such as glass fibers, and a combination of an organosilane coupling agent and an impact modifier. It was discovered that the combination of the aminosilane coupling agent and the impact modifier substantially increased the low shear viscosity and melt strength of the composition without increasing the high shear viscosity of the composition. The increase in the low shear viscosity makes the composition particularly well suited to molding articles with a complex shape. When producing blow molded articles, for instance, the composition provides better control over wall thickness while having improved interior surface smoothness at higher throughput and extrusion rates.
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Citations
14 Claims
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1. A shaped polymer article comprising:
-
a blow molded hollow member including an interior surface and an exterior surface and having a wall thickness between the interior surface and the exterior surface, the hollow member being made from a fiber reinforced polymeric composition comprising on a weight percent basis; a) a linear polyphenylene sulfide having a melt viscosity of from about 20 Pa·
s to about 500 Pa·
s;b) reinforcing fibers present in the composition in an amount from about 10% to about 50% by weight; c) an organosilane coupling agent present in the composition in an amount from about 0.1% to about 2% by weight; d) a reactive impact modifier reactive with the organosilane coupling agent, the reactive impact modifier being present in an amount from about 0.5% to an upper limit whereby the shaped article exhibits a DTUL of at least 200°
C. and a low shear melt viscosity measured at 1 s−
1 of from 15,000 Pa·
s to 85,000 Pa·
s at 310°
C. measured with a Kayaness capillary rheometer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification