# US 4,397,984 A · Use of acrylate-based emulsion copolymer as the sole binder for a paper coating composition

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- Number: US 4,397,984 A
- Document ID: US4397984A
- Status: Granted
- Kind: A
- Application number: 06/338,487
- Filed: 1982-01-11
- Granted: 1983-08-09
- Earliest claimed: 1981-02-02
- Assignees: BASF SE
- Inventors: Kurt Wendel; Guenther Addicks
- Web page: https://patentgrep.com/patent/US4397984A

## CPC

- D21H 19/58: Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
- Y10T 428/31775: Paper
- Y10T 428/3188: Next to cellulosic
- Y10T 428/31895: Paper or wood
- 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

An aqueous paper-coating composition which essentially comprises a finely divided pigment and an emulsion copolymer of (a) from 30 to 80% by weight of C.sub.4 -C.sub.8 -alkyl acrylates or mixtures of C.sub.4 -C.sub.8 -alkyl acrylates and di-(C.sub.4 -C.sub.8 -alkyl) maleates, (b) from 8 to 30% by weight of acrylic acid and/or methacrylic acid, (c) from 0 to 50% by weight of vinyl propionate, vinyl acetate, methyl acrylate, ethyl acrylate and/or vinyl .alpha.-branched C.sub.10 -monocarboxylate, (d) from 0 to 5% by weight of acrylamide, methacrylamide, vinylsulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid and/or acrylonitrile and (e) from 0 to 3% by weight of crosslinking monomers in the form of an aqueous dispersion, as the sole binder and thickener.

## Claims

### Claim 1

A process for preparing a coated paper product, comprising:
coating a paper substrate with a composition of a finely divided pigment and a synthetic binder, the sole binder and thickener components of the composition being an emulsion copolymer of (a) from 30 to 80% by weight of at least one C.sub.4 -C.sub.8 alkyl acrylate or a mixture of at least one C.sub.4 -C.sub.8 alkyl acrylate and at least one di-(C.sub.4 -C.sub.8 -alkyl)maleate; (b) from 8 to 30% by weight of acrylic acid and/or methacrylic acid; (c) from 0 to 50% by weight of vinyl propionate, vinyl acetate, methyl acrylate; ethyl acrylate and/or vinyl .alpha.-branched C.sub.10 -monocarboxylate; (d) from 0 to 5% by weight of acrylamide, methacrylamide, vinylsulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid and/or acrylonitrile and (e) from 0 to 3% by weight of a crosslinking monomer in the form of an aqueous dispersion.

### Claim 2 (depends on 1)

The process of claim 1, wherein said emulsion copolymer comprises (a) from 30 to 80% by weight of n-butyl acrylate, (b) from 8 to 30% by weight of acrylic acid and (c) up to 50% by weight of vinyl propionate and/or vinyl acetate.

### Claim 3 (depends on 1)

The process of claim 1, wherein said paper coating composition contains from four to six parts by weight of said emulsion copolymer per hundred parts by weight of a finely divided pigment with the coated paper product obtained being intended for use in gravure printing.

### Claim 4 (depends on 1)

The process of claim 1, wherein said coating composition contains from 10 to 20 parts by weight of said emulsion copolymer in 100 parts by weight of a finely divided pigment, the coated paper product obtained being intended for use in offset printing.

### Claim 5 (depends on 1)

The process of claim 1, wherein said crosslinking monomer is a methylene-bis-acrylamide, a methylene-bis-methacrylamide, a diacrylate, a polyacrylate, a dimethacrylate or a polymethacrylate of a dihydric or polyhydric C.sub.2 -C.sub.6 -alcohol, divinyldioxane, diallylphthalate, a diallyl ether or triallyl ether of a dihydric or polyhydric alcohol or a diacrylate or dimethacrylate of polyethylene glycol or polypropylene glycol.

### Claim 6 (depends on 1)

The process of claim 1, wherein said C.sub.4 -C.sub.8 alkyl acrylate is n-butyl acrylate, isobutyl acrylate, pentyl acrylate, n-hexyl acrylate or 2-ethylhexyl acrylate.

### Claim 7 (depends on 1)

The process of claim 1, wherein said di-(C.sub.4 -C.sub.8 alkyl)maleate is di-n-butyl maleate, di-isobutyl maleate or di-2-ethylhexyl maleate.