The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 12, 1992
Filed:
Nov. 08, 1989
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A method of forming a silver image receiving element in diffusion transfer photography by hydrolyzing a surface of an alkali-impermeable polymer layer on a continuous running web so as to convert the polymer to an alkali-permeable polymer. The method includes the steps of first applying a liquid mixture of a hydrolyzing agent and a softening agent to the surface of the alkali-impermeable polymer layer, evaporating the softening agent in the liquid mixture by blowing air on the surface to form a concentrated layer of the hydrolyzing agent; and thereafter accelerating the occurrence of hydrolysis by blowing air on the surface so as to initiate hydrolysis reaction of the surface to as to convert the alkali-impermeable polymer layer to an alkali-permeable polymer layer. The temperature of the air which is blown on the surface is in the range of 50.degree. to 120.degree. C.