Vinylidene cyanide alternating copolymers
AssigneeHoechst Celanese Corporation
InventorsAnthony J. East, Anthony B. Conciatori
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Abstract
In one embodiment this invention provides vinylidene copolymers with alternating monomeric units as illustrated by the following structure: ##STR1## An invention vinylidene copolymer in the form of an electret film exhibits a high level of longitudinal piezoelectric effect, and has excellent processability and thermal stability properties.
Claims8
A copolymer which is characterized by alternating monomeric units corresponding to the formula:
- ##STR4## where R is hydrogen, halogen or a C.sub.1 -C.sub.4 alkyl substituent;
- and R.sup.1 is hydrogen or a C.sub.1 -C.sub.8 hydrocarbyl substituent.
An electret film of a thermoplastic copolymer which is characterized by alternating monomeric units corresponding to the formula:
- ##STR5## where R is hydrogen, halogen or a C.sub.1 -C.sub.4 alkyl substituent;
- and R.sup.1 is hydrogen or a C.sub.1 -C.sub.8 hydrocarbyl substituent;
- wherein the film has an external electric field-induced net dipolar orientation of polymer molecules, and the film exhibits piezoelectric properties.
An electro-acoustic conversion or electro-mechanic conversion or pressure-sensitive device having an electret film component of a copolymer which is characterized by alternating monomeric units corresponding to the formula:
- ##STR6## where R is hydrogen, halogen or a C.sub.1 -C.sub.4 alkyl substituent;
- and R.sup.1 is hydrogen or a C.sub.1 -C.sub.8 hydrocarbyl substituent;
- wherein the film has an external electric field-induced net dipolar orientation of polymer molecules, and the film exhibits piezoelectric properties.
Dependencies are inferred from the claim text.