초록 ▼

A novel improved 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. In addition to t

A novel improved 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. In addition to the polymeric antifungal agent, a non-polymeric antifungal agent, such as cetyl pyridinium chloride, sodium or zinc pyrithione, or both, may be included. The polymeric antifungal agent can be present in the gypsum core and/or on one or both of the paper facings. In addition, the antifungal agent may be encapsulated in a material or ionically associated with the polymeric antifungal agent, that releases the antifungal agent over time and/or upon exposure to moisture. Also disclosed are methods for preparing the aforementioned improved antifungal gypsum board.

대표청구항 ▼

What is claimed is: 1. An antifungal gypsum board comprising a gypsum core, front paper facing, and back paper facings, wherein a polymeric antifungal agent is covalently bonded, by use of an initiator, to at least one of said paper facings, and wherein said polymeric antifungal agent is selected f

What is claimed is: 1. An antifungal gypsum board comprising a gypsum core, front paper facing, and back paper facings, wherein a polymeric antifungal agent is covalently bonded, by use of an initiator, to at least one of said paper facings, and wherein said polymeric antifungal agent is selected from the group consisting of polyDADMAC, polyTMMC, and quaternized polyvinyl pyridine derivatives. 2. An improved method for manufacturing a gypsum board comprising covalently bonding, by use of an initiator, a polymeric antifungal agent to the board or a component thereof, adding a non-polymeric antifungal agent to the board or a component thereof, wherein the polymeric antifungal agent is polycationic or polyanionic, and wherein, the non-polymeric antifungal agent is stabilized by the polymeric antifungal agent, whereby the non-polymeric antifungal agent resists leaching. 3. The method of claim 2 further comprising encapsulating or binding the non-polymeric antifungal agent such that the non-polymeric antifungal agent is released over time, upon exposure to moisture, or both. 4. The method of claim 2 wherein, in addition to the polymeric antifungal agent, a non-polymeric_antifungal agent is included in the gypsum board or a component thereof, selected from the group consisting of chlorhexidine, alexidine, cetyl pyridinium chloride, benzalkonium chloride, benzethonium chloride, cetalkonium chloride, cetrimide, cetrimonium bromide, glycidyl trimethylammonium chloride, stearalkonium chloride, hexetidine, sodium pyrithione, zinc pyrithione, triclosan and triclocarban. 5. The method of claim 4 wherein the non-polymeric antifungal agent comprises cetyl pyridinium chloride, pyrithione, or both. 6. The method of claim 5 wherein the polymeric antifungal agent is added in an amount equal to between about 0.01 weight percent and about 1.5 weight percent of the dry gypsum in the gypsum board. 7. An improved process for manufacturing gypsum board comprising covalently bonding, by use of an initiator, an antifungal agent to a paper to be used as a front or back paper facing in the gypsum board, wherein said improvement comprises said antifungal agent being a polymeric antifungal agent selected from the group consisting of polyDADMAC, polyTMMC, and quaternized polyvinyl pyridine derivatives. 8. The process of claim 7 wherein, in addition to a polymeric antifungal agent, an additional non-polymeric antifungal agent is included in the gypsum board or a component thereof selected from the group consisting of chlorhexidine, alexidine, cetyl pyridinium chloride, benzalkonium chloride, benzethonium chloride, cetalkonium chloride, cetrimide, cetrimonium bromide, glycidyl trimethylammonium chloride, stearalkonium chloride, hexetidine, sodium pyrithione, zinc pyrithione, triclosan and triclocarban. 9. A method for making an antifungal gypsum board which comprises treating starch or cellulosic components of gypsum board, whether from the core or the paper facings, with antimicrobial monomer and initiator under conditions which benefit polymerization, optionally washing and recovering the starch or cellulosic component following polymerization, and combining the thus treated starch or cellulosic component with other desired components and at relative concentrations to produce said antifungal gypsum board in which DADMAC monomer is reacted at a final concentration (v/v) of about 25-50%, or TMMC monomer is reacted at a final concentration of about 5-25%; an initiator is mixed with the starch or cellulosic component containing reactive monomer DADMAC or TMMC monomers the thus treated component is heated, washed and the antifungal and antimicrobial starch or cellulosic material is then mixed with the gypsum component of the core or paper facing at different ratios to achieve the physico-chemical characteristics desired, while also imparting an antimicrobially active polymer to the gypsum core, paper facing or both. 10. An improved gypsum board comprising a polymeric antifungal agent formed by a process comprising applying to paper surfaces, either prior to or after application to a gypsum core, a combination of reactive monomer and polymerization initiator, flash heating the reactive monomer and polymerization initiator once in contact with the desired paper surface to initiate polymerization, wherein said polvmeric antifungal agent is selected from the group consisting of polyDADMAC, polyTMMC, and quaternized polyvinyl pyridine derivatives. 11. An antifungal gypsum board comprising a polymeric antifungal agent which is polycationic or polyanionic and a non-polymeric antifungal agent which is stabilized by the polymeric antifungal agent, wherein said polymeric antifungal agent is covalently bound by use of an initiator to a component of the gysum board, and whereby the non-polymeric antifungal agent resists leaching. 12. The antifungal gypsum board of claim 11, wherein the polymeric antifungal agent is polycationic and the non-polymeric antifungal agent is a pyrithione compound. 13. The antifungal gypsum board of claim 11, wherein the polymeric antifungal agent is a poly(quaternary amine). 14. The antifungal gypsum board of claim 13, wherein the polymeric antifungal agent is polyDADMAC. 15. The antifungal gypsum board of claim 1, wherein the polymeric antifungal agent is polyDADMAC.