Gypsum board with a fluorine-containing antifungal agent

a fluorine-containing, antifungal technology, applied in the field of gypsum board, can solve the problems of inconvenient use, seepage, and inability to meet the needs of indoor construction products, and achieve the effects of reducing susceptibility to fungal growth, effective inhibiting fungal growth, and cost-effective and commercially viabl

Inactive Publication Date: 2009-04-23
QUICK MED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]There is an ongoing need for gypsum board products that offer reduced susceptibility to fungal growth without compromising their beneficial properties. In addition, there is an ongoing need for commercially viable manufacturing methods for such products

Problems solved by technology

One fundamental limitation of traditional gypsum board products is their susceptibility to moisture absorption in damp environments.
Unfortunately, products used in interior construction sometimes encounter water due to seepage, leaky roofs or pipes, flooding, condensation, and the lik

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0241]First and second sets of 0.5 inch thick sample gypsum boards comprising about 0.5 and about 1.0 weight percent CPC, respectively, based on the dry weight of the gypsum in the board are produced. The board manufacturing line is run at a speed of 255 linear feet per minute, and separate 5-minute trials are conducted for each set of sample boards. For each five minute trial, the total water in the gypsum slurry is 1133 pounds per thousand square feet per minute of run time (lbs / MSF / min), for a total of 5665 lbs and the total dry gypsum powder is 1300 lbs / MSF / min of run time, for a total of 6500 lbs. For the 0.5% PAA with or without CPC board, 0.005.times.6500=32.5 lbs of PAA with or without CPC is added to the slurry as a 15 weight percent PAA with or without CPC solution, based on total weight of the solution. For the 1.0% PAA with or without CPC board, 0.01.times.6500=65.0 lbs of PAA with or without CPC is added to the slurry as a 15 weight percent PAA with or without CPC solut...

example 2

[0243]In this example, polyDADMAC is formed by polymerization of DADMAC monomers in the presence of a polymerization initiator in an inert atmosphere, in the presence of a gypsum board component, selected from: the front or back paper facings, the pulp used to make the front and back paper facings, the starch included as a component of the gypsum core, or another component to which the nascent polymer becomes covalently bonded as it is formed. Appropriate polymerization initiators are known, including various salts of cerium. Alternatively, an initiator such as a so-called “Azo” initiator, such as VA-057, V-50 and the like, available from Wako Pure Chemical Industries, is utilized. Other initiators, including but not limited to hydrogen peroxide, sodium persulfate (“SPS”), and the like are utilized to advantage according to this invention to initiate polymerization

example 3

[0244]In this example, polyDADMAC is formed by polymerization prior to contact of the polymer with a gypsum board component. An appropriate amount of polyDADMAC is then mixed with the gypsum core components or is sprayed onto the paper facing components of the gypsum board, either prior to or after the paper is affixed to the gypsum core.

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PUM

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Abstract

A novel gypsum board having improved antifungal properties is disclosed. The board comprises a gypsum core, front and back paper facings, and a polymeric antifungal agent effective at inhibiting fungal growth. A preferred polymeric antifungal agent is polyDADMAC or polyTMMC. The novel gypsum board further comprises a non-polymeric antifungal agent comprising a fluorine-containing quaternary ammonium compound. Preferred non-polymeric ammonium compounds include Tetra-n-butylammonium fluoride and Tetraethylammonium fluoride. The polymeric antifungal agent can be present in the gypsum core and/or on one or both of the paper facings. The non-polymeric antifungal agent may be encapsulated in a material or ionically associated with the polymeric antifungal agent to allow releases of the non-polymeric antifungal agent over time and/or upon exposure to moisture. Methods for preparing the aforementioned novel gypsum board are also disclosed.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This non-provisional application is a continuation of U.S. patent application Ser. No. 10 / 546,850 issued as U.S. Pat. No. 7,473,474 on Jan. 6, 2009, which was a national stage filing of PCT / US04 / 05616 filed Feb. 25, 2004 which claims priority to U.S. Provisional Application No. 60 / 449,915 filed on Feb. 25, 2003.BACKGROUND OF THE INVENTION[0002]1. Technical Field of the Invention[0003]The present invention relates generally to gypsum board and methods for making gypsum board. More specifically, the present invention relates to improved gypsum board possessing antifungal properties and improved methods of making the same.[0004]2. Description of Related Art[0005]Gypsum board, which is sold as wallboard and drywall, is a common building material used in various applications including interior walls, partitions and ceiling construction. Commercial gypsum board products are popular for a variety of reasons. They are durable, economical and fire...

Claims

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Application Information

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IPC IPC(8): A01N33/02A01P3/00E04C2/04
CPCA01N25/34A01N33/12B32B13/08E04C2/043A01N43/40A01N37/12A01N55/02A01N2300/00Y10T428/31986Y10T428/31996Y10T428/31993
Inventor TOREKI, WILLIAMOLDERMAN, GERALDSTAAB, GREGORY
Owner QUICK MED TECH
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