Paper coated with synthetic alkali metal aluminosilicates

DETAILED DESCRIPTION The present invention relates to a novel family of unique synthetic compositions hereinafter designated as synthetic alkali metal alumino-silicates or "SAMS" or simply SAMS.
The products of the instant invention relate to a novel family of unique synthetic materials which are shown by transmission electron microscopy (TEM), Fourier Transform-Infrared spectroscopy (FT-IR), x-ray diffraction (XRD), and electron diffraction (ED) to be unique in composition and morphology and which characteristically contain as a minor portion partially altered kaolin particles which give the characteristic peaks for kaolin seen in the x-ray diffraction patterns of the SAMS compositions, but which also contain as the major portion a non-diffracting amorphous or microcrystalline reaction product primarily around the edges, but also to some extent over the face of the altered kaolin particle as illustrated by TEM FIGS.
18 through 23.
The TEM FIGS.
18 to 23 show the SAMS product to be altered kaolin platelets having an integrated rimmed area of amorphous, non-diffracting alkali metal silicate-kaolin reaction product.
The integrated composition of the SAMS product is a unique entity having an overall composition of: xM.
sub.
2 O:Al.
sub.
2 O.
sub.
3 :ySiO.
sub.
2 :zH.
sub.
2 O where x is the number of moles of alkali metal oxide and M is the alkali metal, y is the number of moles of SiO.
sub.
2 in the SAMS composition, and z is the number of moles of bound water.
The unique products are further characterized by XRD as being essentially amorphous and having attenuated kaolin peaks as illustrated by FIGS.
33, 34, 35 and 36.
The SAMS products are also characterized as having infrared spectra (IR) which differ from the IR spectra of the starting clays, zeolites, and both crystalline and amorphous silicas and silicates.
FIG.
1 compares the infrared spectrum of a SAMS composition with the spectra of an amorphous synthetic silicate (Zeolex 23) and silica (Hi-Sil 233), and with calcined clay.
FIG.
2, likewise, compares the infrared spectrum of a SAMS composition with the spectra of zeolites A, X, Y, and analcime