# US 7,608,661 B2 · Water-soluble film from copolymers of vinyl alcohol and itaconic acid, and paper coating articles therefrom

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 7,608,661 B2
- Document ID: US7608661B2
- Status: Granted
- Kind: B2
- Application number: 12/077,308
- Filed: 2008-03-17
- Published: 2008-07-24
- Granted: 2009-10-27
- Earliest claimed: 2003-12-15
- Assignees: E.I. du Pont de Nemours and Company
- Inventors: Elliott Echt; Peter A. Morken; G. Michael Collins
- Web page: https://patentgrep.com/patent/US7608661B2

## CPC

- C09D 129/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- D21H 19/20: comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H 19/58: Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
- D21H 19/60: Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
- 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)
- D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR

## Abstract

The present invention is a composition useful for coating the surface of paper wherein the coating composition is an aqueous solution comprising less than 40 wt % water and consisting essentially of a polyvinyl alcohol copolymer that is at least about 95 % hydrolyzed, and a process for preparing the same.

## Claims

### Claim 1

A water-soluble film useful for coating the surface of paper wherein said film is prepared from a coating composition having an aqueous phase, said aqueous phase comprising a copolymer comprising units of vinyl alcohol, alkyl acrylate, itaconic acid and optionally vinyl acetate, said copolymer comprising i) less than about 5 mol % vinyl acetate units; (ii) about 1 mol % to about 10 mol % itaconic acid units; (iii) at least about 90 mol % vinyl alcohol units and (iv) about 1 mol % to about 9 mol % alkyl acrylate units, wherein said copolymer is completely dissolved in said aqueous phase of the coating composition and the amount of water present in said aqueous phase is such that the concentration of water in the coating composition is less than 40% by weight, based on the total weight of the coating composition.

### Claim 2 (depends on 1)

An article comprising the water-soluble film of claim 1.

### Claim 3 (depends on 1)

The film of claim 1 wherein the copolymer comprises less than about 3 mol % vinyl acetate units and from about 2 mol % to about 8 mol % itaconic acid units.

### Claim 4 (depends on 3)

The film of claim 3 wherein the copolymer comprises less than about 1 mol % vinyl acetate units and from about 3 mol % to about 6 mol % itaconic acid units.

### Claim 5 (depends on 1)

The film of claim 1 wherein the copolymer comprises from about 2 mol % to about 8 mol % itaconic acid units and from about 1 mol % to about 9 mol % alkyl acrylate units.

### Claim 6 (depends on 5)

The film of claim 5 wherein the copolymer comprises from about 3 mol % to about 6 mol % itaconic acid units and from about 1 mol % to about 9 mol % alkyl acrylate units.

### Claim 7

A water-soluble film comprising a hydrolyzed, lactonized vinyl acetate terpolymer composition comprising vinyl alcohol, methyl acrylate, and itaconic acid moieties, wherein: (i) the terpolymer comprises less than about 5 mol % of vinyl acetate moieties; (ii) the methyl acrylate comonomer units in the terpolymer are present in an amount of at least about 1 mol % up to about 9 mol %; (iii) the itaconic acid comonomer units in the terpolymer are is present in an amount of at least about 1 mol % up to about 9 mol %, and, (iv) the methyl acrylate comonomer units of the terpolymer exists in the form of lactones.

### Claim 8 (depends on 7)

An article comprising the water-soluble film of claim 7.