Sensitized record sheet

Claim 2

A thin spongy porous color developler film for use in producing a color when in contact with a suitable dye precursor, produced by thinly depositing on a substrate a composition consisting essentially of: an organic solvent soluble phenolic resin capable of serving as an acidic image former when in combination with a suitable dye precursor, in an amount sufficient to serve as such an image former in the final film; a lipophilic amorphous silica having a stable size not exceeding 50 millimicrons; a fatty alcohol capable of serving as an adjunct in combination with said silica to obtain a porous film structure without substantially adversely affecting the color forming reaction or the color so formed, the combined amounts of said fatty alcohol and lipophilic silica being sufficient to form a spongy capillary skeletal structure in the deposited film; and an organic solvent capable of dissolving said phenolic resin and said fatty alcohol and which does not substantially interfere with the color-forming reaction.

Claim 3

A film in accordance with claim 1, wherein said phenolic resin is an acetylated phenolic resin, salicylic acid modified phenolic resin or a novolac-type phenolic resin.

Claim 4

A film in accordance with claim 1, wherein said phenolic resin is one which has been reacted with or is present in conjunction with a metal cation capable of enhancing the color forming ability of the resin.

Claim 5

A film in accordance with claim 3, wherein said cation is zinc.

Claim 6

A film in accordance with claim 1, wherein said fatty alcohol is cetyl alcohol.

Claim 7

A film in accordance with claim 1 or claim 5, wherein said lipophilic silica is a pyrogenic hydrophobic silica.

Claim 8

A film in accordance with claim 1, wherein said solvent is a non-volatile solvent having a boiling point above about 175° C. and present in an amount sufficient to act as a plasticizer when retained in the deposited film.

Claim 9

A film in accordance with claim 1, wherein said solvent is mineral seal oil.

Claim 10

A film in accordance with claim 1, wherein said composition further includes gelatinous polyethylene in an amount sufficient to provide mechanical rigidity to the deposited film structure without otherwise affecting the spongy nature thereof and which will not substantially affect the color-forming reaction or the color so formed.

Claim 11

A film in accordance with claim 9, wherein said polyethylene comprises oxidized polyethylene.

Claim 12

A film in accordance with claim 1, wherein said composition further includes a liquid zinc salt, soluble in the system, in an amount sufficient to improve the color forming ability of said phenolic resin and reduce the tack of the composition to improve press performance of the composition.

Claim 13

A film in accordance with claim 1, wherein said solvent is a volatile solvent and said phenolic resin, fatty alcohol and lipophilic silica are present in the following relative quantities: ______________________________________ phenolic resin 54-95% fatty alcohol 2-40% lipophilic silica 0.5-6% ______________________________________

Claim 14

A film in accordance with claim 7, wherein the relative proportions of components of said composition are: ______________________________________ phenolic resin 10-70% fatty alcohol 2-20% lipophilic silica 0.5-6% non-volatile solvent 18-82% ______________________________________

Claim 15

A film in accordance with claim 13, wherein said proportions are: ______________________________________ phenolic resin 20-50% fatty alcohol 2-15% lipophilic silica 0.5-5% non-volatile solvent 35-69.5% ______________________________________

Claim 16

A film in accordance with claim 1 in a quantity corresponding to 0.4-1.4 g/m 2 .

Claim 17

A film in accordance with claim 1, wherein said composition consists essentially of: ______________________________________ non-volatile solvent 25-32% oil with volatility of no more than 7% weight loss over 22 hour period at 225° F. 5-9% liquid zinc salt 4-8% granular oxidized polyethylene 2-4% pyrogenic hydrophobic silica 2-4% cetyl alcohol 5-10% zinc abietate 5-12% zincated novolac resin 30-40% ______________________________________

Claim 18

A film in accordance with one of claims 12, 13 or 14 wherein said fatty alcohol is cetyl alcohol and said lipophilic silica is pyrogenic hydrophobic silica.

Claim 19

A record sheet comprising a sheet substrate having deposited thereon a thin continuous or discontinuous film in accordance with claim 1.