Method of preparing an exfoliated vermiculite for the manufacture of finished product
AssigneeTower Technologies (Proprietary) Limited
InventorMichael Windsor Symons
Life of this patent
Estimating the term…
Abstract
A method of preparing particles of an exfoliated vermiculite for the manufacture of a finished product, such as a particle board, includes the steps of, if necessary, chemically modifying the vermiculite by impregnating the vermiculite with a suitable anhydride in a non-aqueous solvent; if necessary, applying to the particles of vermiculite an adhesion promoter to promote the adherence of a resin to the surfaces of the particles of vermiculite; and resinating the particles of vermiculite either with a thermoplastic resin which has been surface modified by irradiation or by fluorination, or by an isocyanate thermosetting resin, or by a dry powder novolac thermosetting resin; and if necessary removing any solvent present.
Claims21
A method of preparing particles of an exfoliated vermiculite for the manufacture of a finished product comprising the steps of:
- (a) if necessary chemically modifying the vermiculite by impregnating the vermiculite with an impregnating composition comprising a dicarboxylic anhydride or a tricarboxylic anhydride dissolved in a suitable non-aqueous solvent;
- (b) if necessary applying to the particles an adhesion promoter to promote the adherence of a resin to the surfaces of the particles of vermiculite;
- (c) resinating the particles of vermiculite by either:
- (i) applying to the particles a thermoplastic resin in dry powder form, so that after the application of the adhesion promoter, the thermoplastic resin adheres to the surfaces of the particles of vermiculite, the thermoplastic resin having been surface modified by irradiation or by fluorination;
- or
- (ii) including in the impregnating composition of step (a) an isocyanate thermosetting resin dissolved in a solvent;
- or
- (iii) applying to the particles a dry powder novolac thermosetting resin and if necessary a catalyst therefor so that after the application of the adhesion promoter, the dry powder novolac thermosetting resin adheres to the surfaces of the particles of vermiculite;
- and
- (d) if necessary after step (c), removing any solvent present.
Dependencies are inferred from the claim text.