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 rigid rod polybenzazole polymer and blocks of thermoplastic polybenzazole polymer can be compression molded to provide a molded article having physical properties superior to molded articles made from the thermoplastic polymer alone.
Claims68
A granular composition comprising a block copolymer having at least one rigid rod polybenzazole polymer block and at least one thermoplastic polybenzazole polymer block 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 at least one rigid rod polybenzazole polymer block and at least one thermoplastic polybenzazole polymer block 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 process for molding a shaped article comprising the step of molding a plurality of moldable particles, containing a block copolymer having at least one rigid rod polybenzazole polymer block and at least one thermoplastic polybenzazole polymer block 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 plurality of moldable particles, containing a block copolymer having at least one rigid rod polybenzazole polymer block and at least one thermoplastic polybenzazole polymer block 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.
A molded article comprising a block copolymer having at least one rigid rod polybenzazole polymer block and at least one thermoplastic polybenzazole polymer block, wherein said block copolymer is not substantially phase separated.
A block copolymer comprising:
- (a) at least one rigid rod polybenzazole block containing on average at least about 5 mer units and less than 10 mer units;
- and
- (b) at least one thermoplastic polybenzazole block linked to said rigid rod polybenzazole block
- wherein the composition and proportions of the rigid rod polybenzazole block and the thermoplastic polybenzazole block are chosen such that the block copolymer becomes flowable at a temperature at which it does not substantially decompose.
Dependencies are inferred from the claim text.