Patent GB-564993-A (GB)
Title: Improvements relating to the prevention of mist and frost on glass and similar sheetmaterial
IPC: C03C17/32
Filed: 1942-04-16
Abstract: A thin dry transparent sheet for application to glass or organic glass substitute windscreens of aircraft and motor cars to render them non-misting and non-frosting comprises transparent regenerated cellulose, viscose or other foil coated with an adhesive composition adapted to be activated and softened for sticking to the glass &c. by wetting by aqueous media and containing a nitro-ester of a polyhydroxy organic compound particularly nitro-cellulose or a mixture of such nitro-esters, such as nitro-cellulose and nitro-glycerine or nitro-cellulose compounded with camphor &c. (celluloid), an essential constituent of the adhesive composition being a transparent gel-forming substance such as glue or gelatin. It is convenient to prepare a water-alcohol solution of the glue or gelatine and to dissolve the nitro-ester or esters in acetic or other monobasic aliphatic acid before mixing therewith and clarifiers and surface tension reducers may be added.  One example comprises gelatine 40 gms. nitro-cellulose 1-5 gms., glacial acetic acid 250-400 c.c., sodium choleate 10-15 gms., water 100-150 c.c., and methylated spirit 600-750 c.c. and a small proportion of salicylic acid may be added.  An improved wetting liquid for wetting and softening the coated sheet just before its application to the glass &c. consists of an aqueous solution of glycol, glycerine or a water-soluble ester or ether of glycol or glycerine singly or in any grouping such as diethylene glycol mono-butyl ether or diethylene glycol mono-ethyl ether acetate and/or a penetrant oil such as "Calsolene" (Registered Trade Mark).  Specifications 564,987 and 564,989 are referred to.ALSO:A thin dry transparent sheet for application to glass or organic glass substitute windscreens of aircraft and motor cars to render them non-misting and non-frosting, comprises transparent regenerated cellulose, viscose or other foil coated with an adhesive composition adapted to be activated and softened for sticking to the glass &c., by wetting by aqueous media and containing a nitro-ester of a poly-hydroxy organic compound particularly nitro-cellulose or a mixture of such nitro-esters such as nitro-cellulose and nitro-glycerine or nitro-cellulose compounded with camphor &c. (celluloid), an essential constituent of the adhesive composition being a transparent gel-forming substance such as glue or gelatin.  It is convenient to prepare a water-alcohol solution of the glue or gelatine and to dissolve the nitro-ester or esters in acetic or other mono-basic aliphatic acid before mixing therewith and clarifies and surface tension reducers may be added. One example comprises gelatin 40 gms., nitro-cellulose 1-5 gms., glacial acetic acid 250-400 c.c., sodium choleate 10-15 gms., water 100-150 c.c. and methylated spirit 600-750 c.c. and a small porportion of salicylic acid may be added.  An improved wetting liquid for wetting and softening the coated sheet just before its application to the glass &c. consists of an aqueous solution of glycol, glycerine or a water-soluble ester or ether of glycol or glycerine, singly or in any grouping, such as diethylene glycol mono-butyl ether or diethylene glycol mono-ethyl ether acetate and/or a penetrant oil such as "Calsolene" (Registered Trade Mark). Specifications 564,987 and 564,989, [both in Group X], are referred to.