Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Identified backing or protective layer containing
Patent
1996-06-27
1999-03-30
Chea, Thorl
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Identified backing or protective layer containing
430530, 430631, 4233281, 25251932, 25251933, 2525213, G03C 189
Patent
active
058887113
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a novel polymeric conductive alumino-silicate and a process for preparing it. The present invention also concerns an element having thereon said new polymeric material.
Aluminosilicate in fiber form is known in the Art. A filamentous, tubular and crystallized aluminosilicate called Imogolite has been found in volcanic ashes and other soils. Farmer in U.S. Pat. No. 4,152,404 and 4,252,779 describes an inorganic material related to natural imogolite. This inorganic material is synthesized by reacting soluble silica or a soluble silicate compound with an aluminum compound to form a soluble hydroxyaluminum silicate complex in an aqueous solution at a pH of 3.2 to 5.5; and digesting at pH 3.1 to 5.0 soluble hydroxyaluminum complexes freshly formed, thereby forming a colloidal dispersion of the inorganic material. This inorganic material can be used as molecular sieve, catalyst support, coagulant or sorbent. By evaporating imogolite colloidal solutions onto a flat surface, coherent films can be formed and used as membranes. When the product is not isolated from its colloidal solution, it may be used as a flocculant, a hydrophilizer or a thickener.
Aluminum silicon metal oxide particles have been described in a large number of patents. Theses particles are crystallized electrically conductive particles which are used dispersed in a binder as antistatic material. For example, a composite oxide from aluminum and silicon has been described in U.S. Pat. No. 4,495,276. In this patent, the crystalline metal oxide particles are used as an antistatic layer in a photographic element.
EP 250,154 describes a photographic element comprising a polymeric surface to which is adhered a layer comprising a gelled network of inorganic particles, preferably inorganic oxide particles. According to that patent, the gelled network is a porous coating having voids between the inorganic oxide particles. The porous coating is obtained from a dispersion or suspension of finely divided particles in a liquid medium. Inorganic oxide particles can be boehmite (aluminum oxide), silica or alumina-coated silica. The "gelled network" is formed by an aggregation of colloidal particles linked together to form a porous three-dimensional network. The gelled network provides a subbing layer having antistatic properties.
An object of the present invention is to provide a new homogeneous polymeric alumino-silicate material having antistatic properties. An other object of the present invention is to provide a new process to obtain this polymeric material. A third object of the present invention is to provide an element comprising an antistatic layer consisting of the polymeric material of the present invention.
In accordance with the invention, there is provided a process to obtain the polymeric alumino-silicate according to the invention which comprises the following steps: precursor, with an aqueous alkali, whilst maintaining the pH at a value between 4 and 6.5; the Al molar concentration being maintained in the range of 5.times.10.sup.-4 to 10.sup.-2, and the Al/Si molar ratio between 1 and 3; 100.degree. C., and in the presence of silanol groups, for a period sufficient to have a complete reaction whereby a polymeric material is obtained; and
The material thus obtained is a polymeric fibrous alumino-silicate which can be directly applied onto a support in order to unexpectedly form an antistatic layer.
An other object of the present invention is a polymeric inorganic material comprising more than 80 moles % of a fibrous alumino-silicate of formula Al.sub.x Si.sub.y O.sub.z, wherein the ratio x:y is between 1 and 3, preferably between 1.5 and 2.5; z is between 1 and 10, preferably between 2 and 6. According to one embodiment, the polymeric material comprises more than 98 moles % of a fibrous alumino-silicate having the above formula. This new polymeric material has properties which make it possible to envisage its use for producing in particular antistatic coatings or permeable membranes.
In accordance with the invention,
REFERENCES:
patent: 4152404 (1979-05-01), Farmer
patent: 4252779 (1981-02-01), Farmer
patent: 4495276 (1985-01-01), Takimoto et al.
patent: 5714309 (1998-02-01), Poncelet et al.
Chemical Abstracts, vol. 91, No. 22, Nov. 26, 1979, abstract no. 178284.
European Polymer Journal, col. 27, No. 7, (1991), Oxford GB, pp. 609-612, S. M. Barrett et al.
Poncelet Olivier Jean Christian
Rigola Jeannine
Anderson Andrew J.
Chea Thorl
Eastman Kodak Company
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