# US 9,518,363 B2 · Antimicrobial size emulsion and gypsum panel made therewith

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- Number: US 9,518,363 B2
- Document ID: US9518363B2
- Status: Granted
- Kind: B2
- Application number: 14/257,411
- Filed: 2014-04-21
- Published: 2014-08-14
- Granted: 2016-12-13
- Earliest claimed: 2010-12-29
- Assignees: United States Gypsum Company
- Applicants: United States Gypsum Company
- Inventors: Evan V. Rohlf; Mark B. Scalf
- Web page: https://patentgrep.com/patent/US9518363B2

## CPC

- D21H 21/36: Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents
- A01N 33/12: Quaternary ammonium compounds
- D21H 17/07: Nitrogen-containing compounds
- D21H 21/16: Sizing or water-repelling agents
- E04C 2/043: {of plaster (E04C2/049 takes precedence)}
- Y10T 428/31993: Of paper
- Y10T 428/31996: Next to layer of metal salt [e.g., plasterboard, etc.]
- 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
- A01N: PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF (preservation of food or foodstuff A23); BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES (preparations for medical, dental or toiletry purposes which kill or prevent the growth or proliferation of unwanted organisms A61K); PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- E04C: STRUCTURAL ELEMENTS; BUILDING MATERIALS (for bridges E01D; specially designed for insulation or other protection E04B; elements used as building aids E04G; for mining E21; for tunnels E21D; structural elements with broader range of application than for building engineering F16, particularly F16S)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Disclosed is an emulsion of an internal paper size and a biocidal emulsifying agent, such as a cationic non-starchy quaternary ammonium compounds, that is introduced into a paper-making furnish to produce an anti-microbial paper. The antimicrobial paper is useful as facing for gypsum panels. A method of making the paper includes emulsifying the internal size with a biocide before introducing the size to the paper furnish. A method of making a microbial growth resistant gypsum panel that incorporates the antimicrobial paper is also disclosed.

## Claims

### Claim 1

A mold-resistant gypsum panel comprising:
a gypsum core;
at least one facer comprising
paper made from a furnish that includes a paper sizing emulsion comprising an emulsion of a biocidal emulsifying agent and an internal sizing agent, wherein the biocidal emulsifying agent is a non-starchy quaternary ammonium compound, and wherein the internal sizing agent and biocidal emulsifying agent are emulsified in water.

### Claim 2 (depends on 1)

The mold-resistant gypsum panel of claim 1 wherein said emulsion is free of additional emulsifying agents.

### Claim 3 (depends on 1)

The mold-resistant gypsum panel of claim 1 wherein said internal sizing agent is selected from the group consisting of alkenyl succinic anhydride and alkyl ketene dimer.

### Claim 4 (depends on 1)

The mold-resistant gypsum panel of claim 1 wherein said internal sizing agent is alkenyl succinic anhydride.

### Claim 5 (depends on 1)

The mold-resistant gypsum panel of claim 1 wherein the biocidal emulsifying agent is a non-starchy cationic quaternary ammonium compound.

### Claim 6 (depends on 1)

The mold-resistant gypsum panel of claim 1, wherein said non-starchy quaternary ammonium compound is at least one selected from the group consisting of alkyl dimethyl benzyl ammonium chloride, alkyl dimethyl ethyl benzyl ammonium chloride, dialkyl dimethyl ammonium chloride, didecyl dimethyl ammonium chloride, and combinations thereof.

### Claim 7 (depends on 1)

The mold-resistant gypsum panel of claim 1, wherein said biocidal emulsifying agent is selected from the group consisting of dequalinium chloride, didecyl-dimethylphosphonium chloride, didodecyl-ethyl-isobutylphosphonium, dihexyldecyl-ethyl-isobutylphosphonium, long chain alkyl amines, guanidines, bis (3-aminopropyl) dodecylamine and polyaminopropyl biguanide, or a combination thereof.

### Claim 8 (depends on 1)

The mold-resistant gypsum panel of claim 1, wherein the ratio of the internal sizing agent to the biocidal emulsifying agent is 1.5 parts of the internal sizing agent to one part of the biocidal emulsifying agent.