Polyamide-imide and mica pulp particles and paper-like sheets made therefrom
AssigneeTeijin Limited
InventorsShuichi Uchiyama, Satoshi Utsunomiya, Hideo Watase
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Abstract
Pulp particles consisting essentially of 50 to 90% by weight of mica particles and 50 to 10% by weight of polyamide-imide, said polyamide-imide forming a continuous phase in which said mica particles are dispersed discontinuously. A paper-like sheet comprising an integrated intimate mixture of 20 to 95% by weight of the pulp particles and 80 to 5% by weight of staple fibers of a thermally stable polymer.
Claims17
Pulp particles consisting essentially of 50 to 90% by weight of mica particles having a particle size in a range of 60 - 3000 Tyler mesh and 50 to 10% by weight of a film-forming polyamide-imide at least 70 mol % of which recurring units consist of at least one or more of recurring units of the following formula ##STR10## wherein X is --O-- or --CH.sub.2 -- in which said polyamide-imide forms a continuous phase and said mica particles are dispersed discontinuously in said continuous phase.
A paper-like sheet comprising an integrated intimate mixture of 20 to 95% by weight of the pulp particles of claim 1 and 80 to 5% by weight of staple fibers of a thermally stable polymer.
Pulp particles consisting essentially of 50 - 90% by weight of mica particles having a particle size such that at least 90% by weight are from 1 to 150 microns, and 50 - 10% by weight of a film-forming polyamide-imide having recurring units which consist essentially of ##STR11## wherein X is --O-- or --CH.sub.2 -- in which said polyamide-imide forms a continuous phase and said mica particles are dispersed discontinuously in said continuous phase.
A paper-like sheet comprising an integrated intimate mixture of 20 to 95% by weight of the pulp particles of claim 10 and 80 to 5% by weight of staple fibers of a thermally stable polymer.
Dependencies are inferred from the claim text.