Shaped articles containing copolymers of polybenzazoles
AssigneeThe Dow Chemical Company
InventorsWen-Fang Hwang, Otto C. Raspor, William J. Harris, Thuan P. Dixit
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Abstract
Granular compositions which comprise a block copolymer containing blocks of polybenzazole polymer and blocks of thermoplastic polymer can be compression molded to provide a molded article having physical properties superior to molded articles made from the thermoplastic polymer alone.
Claims66
A granular composition comprising a block copolymer having polybenzazole polymer blocks and thermoplastic polymer blocks selected such that the block copolymer is thermoplastic and can be compression molded without substantial phase separation, said granular composition having an average particle diameter of no more than about 1000.mu..
A granular composition comprising a block copolymer having polybenzazole polymer blocks and thermoplastic polymer blocks selected such that the block copolymer is flowable at a temperature below its decomposition temperature, wherein said granular composition has an average particle diameter of no more than about 1000.mu..
A block copolymer comprising:
- (a) at least one polybenzazole block containing on average at least about 5 mer units and less than 10 mer units;
- and
- (b) at least one thermoplastic block linked to said polybenzazole block
- selected such that the block copolymer becomes flowable at a temperature at which it does not substantially decompose.
A molded article comprising a block copolymer having polybenzazole polymer blocks and thermoplastic polymer blocks, wherein said block copolymer is not substantially phase separated.
A process for molding a shaped article comprising the step of molding a granular composition, containing a block copolymer having polybenzazole polymer blocks and thermoplastic polymer blocks selected such that the block copolymer is thermoplastic and can be compression molded without substantial phase separation, in a mold at a temperature at which the granular composition is flowable and a pressure sufficient to cause the granular composition to consolidate and conform to the shape of the mold.
A process for molding a shaped article comprising the step of molding a granular composition, containing a block copolymer having polybenzazole polymer blocks and thermoplastic polymer blocks selected such that the block copolymer is flowable at a temperature below its decomposition temperature, in a mold at a temperature at which the granular composition is flowable and a pressure sufficient to cause the granular composition to consolidate and conform to the shape of the mold.
Dependencies are inferred from the claim text.