# US 4,395,499 A · High strength pigment binders for paper coatings containing carboxylated vinyl ester alkyl acrylic interpolymers

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- Number: US 4,395,499 A
- Document ID: US4395499A
- Status: Granted
- Kind: A
- Application number: 06/417,291
- Filed: 1982-09-13
- Granted: 1983-07-26
- Earliest claimed: 1982-09-13
- Assignees: National Starch and Chemical Corporation
- Inventors: Josephine M. Rosenski; Joseph M. Fernandez
- Web page: https://patentgrep.com/patent/US4395499A

## CPC

- D21H 19/58: Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
- D21H 19/60: Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
- Y10T 428/31906: Ester, halide or nitrile of addition polymer
- 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
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

High strength pigment binders for paper coating having increased water retention and stability are disclosed. The coating compositions comprise an aqueous synthetic polymer latex and pigment and may contain other additives used in the art of pigmented paper coating. The latex comprises a dispersed interpolymer of a vinyl ester, a polyethylenically unsaturated comonomer and a ethylenically unsaturated mono- or dicarboxylic acid and optionally an alkyl acrylate.

## Claims

### Claim 1

A pigmented paper coating composition comprising an aqueous synthetic polymer latex binder, pigment and sufficient alkali to achieve a pH of 6 to 10, the latex comprising dispersed therein an interpolymer having a T.sub.g value of +30.degree. to -40.degree. C. which consists essentially of:
(a) a vinyl ester of an alkanoic acid having one to 13 carbon atoms interpolymerized with the following comonomers:
(b) from 0 to 75% by weight of an alkyl acrylate;
(c) from 0.01 to 1 parts per 100 parts (a) and (b) of a polyethylenically unsaturated comonomer selected from the group consisting of triallyl cyanurate, triallyl isocyanurate, diallyl maleate, diallyl fumarate, divinyl benzene and diallyl phthalate; and
(d) from 0.5 to 15 parts per 100 parts (a) and (b) of an ethylenically unsaturated mono- or dicarboxylic acid or the half esters thereof.

### Claim 2 (depends on 1)

The composition of claim 1 wherein the carboxylic acid component of (d) is selected from the group consisting of acrylic acid, vinyl acetic acid, crotonic acid, methacrylic acid, tiglic acid, maleic acid, fumaric acid, itaconic acid, maleic acid, citraconic acid, hydromusonic acid, and allylmolonic acid, mono(2-ethylhexyl) maleate, monoethyl maleate and monobutyl maleate.

### Claim 3 (depends on 1)

The composition of claim 1 wherein the alkyl acrylate contains 1 to 8 carbon atoms in the alkyl portion thereof.

### Claim 4 (depends on 3)

The composition of claim 3 wherein the alkyl acrylate is butyl acrylate.

### Claim 5 (depends on 1)

The composition of claim 1 wherein the vinyl ester is selected from the group consisting of vinyl formate, vinyl acetate, vinyl propionate, vinyl butyrate, vinyl isobutyrate, vinyl valerate, vinyl 2-ethylhexanoate, vinyl isooctanoate, vinyl nonate, vinyl decanoate, vinyl pivalate and vinyl versatate.

### Claim 6 (depends on 5)

The composition of claim 5 wherein the vinyl ester is vinyl acetate.

### Claim 7 (depends on 1)

The composition of claim 1 wherein the interpolymer consists essentially of 50-90% vinyl acetate, 10-50% butyl acrylate, 0.2-0.4 parts diallyl maleate and 3-5 parts monoethyl maleate per 100 parts vinyl acetate and butyl acrylate.

### Claim 8 (depends on 1)

The composition of claim 1 wherin the coating comprises 100 parts of the pigment, 0.01-0.5 parts dispersing agent, 3-30 parts (solids) latex, 0-25 parts co-binder, 0-0.2 parts defoamer and sufficient water to obtain a solids level of 35 to 70 weight percent.

### Claim 9 (depends on 1)

A fibrous web coated with the pigmented paper coating composition of claim 1, said coating being that deposited upon the evaporation of water from the aqueous coating composition applied to said web.

### Claim 10 (depends on 9)

A fibrous web as defined in claim 9 wherein said composition has a solids content of 35 to 70% and said latex is present, on a latex solids basis, in the amount of 3 to 30 parts by weight per 100 parts of said pigment.

### Claim 11 (depends on 1)

A method for coating a fibrous web which comprises applying to said web the aqueous pigmented paper coating composition of claim 1.