Thermographic cholesteric coating compositions and plates

Claim 2

A thermographic plate particularly for medical investigation comprising a polymer film substrate sheet and a coat of about 1 to 6 mils thickness comprising single-droplet microcapsules having transparent wall material, and having core material consisting essentially of about 55 to about 75% of cholesteryl pelargonate, about 14 to about 35% of isostearyl cholesteryl carbonate, about 2.0 to about 6.0% of cholesteryl propionate and about 4.5 to about 7.2% of cholesteryl chloride.

Claim 3

The thermographic plate of claim 1, wherein the single-droplet microcapsules are of uniform size.

Claim 4

The thermographic plate of claim 1, wherein the microcapsules have an average diameter of 30 to 50 microns.

Claim 5

The thermographic plate of claim 1, wherein the substrate sheet is transparent.

Claim 6

The thermographic plate of claim 1, wherein the substrate sheet is black and non-transparent.

Claim 7

The thermographic plate of claim 1, wherein the substrate sheet is transparent and in which the thermographic plate includes an opaque overcoat.

Claim 8

The thermographic plate of claim 1, wherein the coat bears an overcoat of transparent polymer film material.

Claim 9

The thermograhic plate of claim 1, wherein the coat further comprises a polymer film binding material and wherein the microcapsule wall material is urea-formaldehyde resin.

Claim 10

The thermographic plate of claim 1 comprising an overcoating about 3 to 10 mils thickness consisting essentially of about 53% styrene-acrylic latex (45% solids), about 27% aqueous carbon black (35% solids), about 20% polyvinyl alcohol (10% solution).

Claim 11

The thermographic plate of claim 1, wherein the substrate sheet is elastic.

Claim 12

The thermographic plate of claim 1, wherein the substrate sheet is polyurethane.

Claim 13

The thermographic plate of claim 1, wherein the substrate sheet contains carbon black.

Claim 14

The thermographic plate of claim 1, wherein the microcapsules are of two kinds, distinguished from each other by the core material compositions of each, wherein the microcapsule core material compositions are selected from the following: ______________________________________ % Isostearyl % Choles- % Cholesteryl Cholesteryl % Cholesteryl teryl Pelargonate Carbonate Propionate Chloride ______________________________________ (a) 66.4 21.6 5.5 6.5 (b) 66.5 22.0 4.6 6.9 (c) 68.0 20.3 4.7 7.0 (d) 70.0 18.3 4.7 7.0 (e) 71.0 17.3 4.7 7.0 (f) 72.7 15.6 4.7 7.0 (g) 73.2 15.0 5.4 6.4 (h) 73.4 14.5 5.6 6.5 ______________________________________ and wherein the two kinds of microcapsules are used in about equal portions selected as follows: (a) and (d), (b) and (e), (c) and (f), (d) and (g), or (e) and (h).

Claim 15

The thermographic plate of claim 1, wherein the microcapsules are of two kinds, distinguished from each other by the core material compositions of each, wherein the microcapsule core material compositions are selected from the following: ______________________________________ % Isostearyl % Choles- % Cholesteryl Cholesteryl % Cholesteryl teryl Pelargonate Carbonate Propionate Chloride ______________________________________ (a) 66.4 21.6 5.5 6.5 (b) 66.5 22.0 4.6 6.9 (c) 68.0 20.3 4.7 7.0 (d) 70.0 18.3 4.7 7.0 (e) 71.0 17.3 4.7 7.0 (f) 72.7 15.6 4.7 7.0 (g) 73.2 15.0 5.4 6.4 (h) 73.4 14.5 5.6 6.5 ______________________________________ and wherein the two kinds of microcapsules are used in about equal portions selected as follows: (a) and (d), (b) and (e), (c) and (f), (d) and (g), or (e) and (h), and wherein the substrate sheet is transparent and in which the thermographic plate includes an opaque overcoat.

Claim 16

The thermographic plate of claim 1, wherein the core material consists essentially of about 65-75% cholesteryl pelargonate, about 14-22% isostearyl cholesteryl carbonate, about 4.5-6.0% cholesteryl propionate and about 6.2-7.2% cholesteryl chloride.

Claim 17

The thermographic plate of claim 1, wherein the microcapsules are of two kinds, distinguished from each other by the core material compositions of each, wherein the microcapsule core material compositions are selected from the following: ______________________________________ % Isostearyl % Choles- % Cholesteryl Cholesteryl % Cholesteryl teryl Pelargonate Carbonate Propionate Chloride ______________________________________ (a) 58.5 33.9 2.4 5.2 (b) 60.7 31.5 2.4 5.4 (c) 61.2 31.5 2.5 4.8 (d) 62.2 30.7 2.1 5.0 (e) 63.5 29.2 2.2 5.1 (f) 65.3 27.2 2.6 4.9 (g) 66.3 26.2 2.6 4.9 ______________________________________ and wherein two microcapsule core materials are used in about equal portions, selected as follows: (a) and (c), (b) and (d), (c) and (e), (d) and (f) or (e) and (g).

Claim 18

The thermographic plate of claim 1, wherein the microcapsules are of two kinds, distinguished from each other by the core material compositions of each, wherein the microcapsule core material compositions are selected from the following: ______________________________________ % Isostearyl % Choles- % Cholesteryl Cholesteryl % Cholesteryl teryl Pelargonate Carbonate Propionate Chloride ______________________________________ (a) 58.5 33.9 2.4 5.2 (b) 60.7 31.5 2.4 5.4 (c) 61.2 31.5 2.5 4.8 (d) 62.2 30.7 2.1 5.0 (e) 63.5 29.2 2.2 5.1 (f) 65.3 27.2 2.6 4.9 (g) 66.3 26.2 2.6 4.9 ______________________________________ and wherein two microcapsule core materials are used in about equal portions, selected as follows: (a) and (c), (b) and (d), (c) and (e), (d) and (f) or (e) and (g), and wherein the substrate sheet is transparent and in which the thermographic plate includes an opaque overcoat.

Claim 19

A thermographic plate of claim 1, wherein the core material consists essentially of about 55-67% cholesteryl pelargonate, about 25-35% isostearyl cholesteryl carbonate, about 2.0-2.8 cholesteryl propionate and about 4.5 to 5.5 cholesteryl chloride.