# US 9,752,042 B2 · Sacrificial coating compositions comprising polyvinyl alcohol and waxy starch

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- Number: US 9,752,042 B2
- Document ID: US9752042B2
- Status: Granted
- Kind: B2
- Application number: 15/228,919
- Filed: 2016-08-04
- Published: 2016-11-24
- Granted: 2017-09-05
- Earliest claimed: 2015-02-12
- Assignees: Xerox Corporation
- Applicants: Xerox Corporation
- Inventors: Guiqin Song; Chu-Heng Liu; Marcel P. Breton
- Web page: https://patentgrep.com/patent/US9752042B2

## CPC

- C09D 103/02: Starch; Degradation products thereof, e.g. dextrin
- C09D 5/008: {Temporary coatings (C09D5/20 takes precedence)}
- C09D 103/00: Coating compositions based on starch, amylose or amylopectin or on their derivatives or degradation products
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)

## Abstract

Disclosed herein are sacrificial coating compositions comprising at least one polyvinyl alcohol; at least one waxy starch; at least one hygroscopic agent; at least one surfactant; and water, wherein the ratio by weight of the at least one waxy starch to the at least one polyvinyl alcohol is at least two to one. In certain embodiments, the at least one polyvinyl alcohol has a degree of hydrolysis of at least about 95%, such as at least about 98%, or at least about 99.3%. In certain embodiments, the viscosity of the at least one polyvinyl alcohol in a deionized water solution at 20° C. ranges from about 30 cps to about 80 cps, wherein the solution contains 4% by weight polyvinyl alcohol relative to the total weight of polyvinyl alcohol and deionized water in the solution. Also disclosed herein are methods of making a sacrificial coating composition.

## Claims

### Claim 1

A coating composition comprising:
at least one polyvinyl alcohol having a degree of hydrolysis of at least about 95%;
at least one waxy starch;
at least one hygroscopic agent;
at least one surfactant; and
water,
wherein the ratio by weight of the at least one waxy starch to the at least one polyvinyl alcohol is at least 2:1.

### Claim 2 (depends on 1)

The coating composition according to claim 1, wherein the at least one waxy starch comprises at least 90% amylopectin.

### Claim 3 (depends on 1)

The coating composition according to claim 1, wherein the at least one waxy starch is selected from the group consisting of a waxy maize starch, a waxy rice starch, a waxy cassava starch, a waxy potato starch, a waxy wheat starch, and a waxy barley starch.

### Claim 4 (depends on 1)

The coating composition according to claim 1, wherein the ratio by weight of the at least one waxy starch to the at least one polyvinyl alcohol ranges from about 2:1 to about 4:1.

### Claim 5 (depends on 4)

The coating composition according to claim 4, wherein the at least one waxy starch is selected from the group consisting of a waxy maize starch, a waxy rice starch, a waxy cassava starch, a waxy potato starch, a waxy wheat starch, and a waxy barley starch.

### Claim 6

A coating composition comprising:
at least one polyvinyl alcohol having a degree of hydrolysis of at least 95%;
at least one waxy starch;
at least one hygroscopic agent;
at least one surfactant; and
water,
wherein the ratio by weight of the at least one waxy starch to the at least one polyvinyl alcohol is at least 2:1.

### Claim 7 (depends on 6)

The coating composition according to claim 6, wherein the at least one waxy starch comprises at least 90% amylopectin.

### Claim 8 (depends on 6)

The coating composition according to claim 6, wherein the at least one waxy starch is selected from the group consisting of a waxy maize starch, a waxy rice starch, a waxy cassava starch, a waxy potato starch, a waxy wheat starch, and a waxy barley starch.

### Claim 9 (depends on 6)

The coating composition according to claim 6, wherein the ratio by weight of the at least one waxy starch to the at least one polyvinyl alcohol ranges from about 2:1 to about 4:1.

### Claim 10 (depends on 9)

The coating composition according to claim 9, wherein the at least one waxy starch is selected from the group consisting of a waxy maize starch, a waxy rice starch, a waxy cassava starch, a waxy potato starch, a waxy wheat starch, and a waxy barley starch.