Mold release composition and process therewith

Abstract

A composition that can be used as mold release agent is disclosed. The composition comprises a solvent; a silicone resin, gum, or fluid; and optionally a catalyst, a co-solvent, or both in which the solvent is a volatile siloxane. Also provided is a process for applying a thin, continuous film coating on or onto a mold. The process comprises combining a solvent, a silicone resin or silicone gum or silicone fluid, and optionally a catalyst, a co-solvent, or both to produce a mold release composition; applying the mold release composition on or onto a mold, and optionally curing the composition in which the solvent is a volatile siloxane.

1 . A composition comprising a solvent; a silicone resin, gum, or fluid; and optionally a catalyst, a co-solvent, or both in which the solvent is a volatile siloxane.  
     
     
         2 . A composition according to  claim 1  comprising said catalyst, said co-solvent, or both.  
     
     
         3 . A composition according to  claim 1  comprising said catalyst and said co-solvent.  
     
     
         4 . A composition according to  claim 1  wherein said solvent has the formula of R(R 2 SiO) x SiR 3  or (R 2 SiO) y  wherein each R is independently an alkyl group, alkoxy group, a phenyl group, a phenoxy group, or combinations of two or more thereof having 1 to about 10 carbon atoms per group.  
     
     
         5 . A composition according to  claim 2  wherein said solvent has the formula of R(R 2 SiO) x SiR 3  or (R 2 SiO) y  wherein each R is independently an alkyl group, alkoxy group, a phenyl group, a phenoxy group, or combinations of two or more thereof having 1 to about 10 carbon atoms per group.  
     
     
         6 . A composition according to  claim 1  wherein said solvent is hexamethyidisiloxane, hexamethylcyclotrisiloxane, 2,5-dichloro-1,1,3,3,5,5,-hexamethyltrisiloxane, 1,3-dimethyltetramethoxydisiloxane, 1,1,1,3,5,5,5,-heptamethyltrisiloxane, 3-(heptafluoropropyl)trimethysiloxane, octamethyltrisiloxane, octamethylcyclotetrasiloxane, decamethyltetrasiloxane, decamethylcyclopentasiloxane, dodecamethylpentasiloxane, dodecamethylcyclohexasiloxane, or combinations of two or more thereof.  
     
     
         7 . A composition according to  claim 6  wherein said solvent is octamethyltrisiloxane, octamethylcyclotetrasiloxane, decamethyltetrasiloxane, or combinations of two or more thereof.  
     
     
         8 . A composition according to  claim 2  wherein said solvent is hexamethyldisiloxane, hexamethylcyclotrisiloxane, 2,5-dichloro-1,1,3,3,5,5,-hexamethyltrisiloxane, 1,3-dimethyltetramethoxydisiloxane, 1,1,1,3,5,5,5,-heptamethyltrisiloxane, 3-(heptafluoropropyl)trimethysiloxane, octamethyltrisiloxane, octamethylcyclotetrasiloxane, decamethyltetrasiloxane, decamethylcyclopentasiloxane, dodecamethylpentasiloxane, dodecamethylcyclohexasiloxane, or combinations of two or more thereof.  
     
     
         9 . A composition according to  claim 3  wherein said solvent is octamethyltrisiloxane, octamethylcyclotetrasiloxane, decamethyltetrasiloxane, or combinations of two or more thereof.  
     
     
         10 . A composition according to  claim 9  wherein said catalyst is a titanium compound, dibutyltin diacetate, or combinations thereof.  
     
     
         11 . A composition according to  claim 6  wherein said silicone resin, gum, or fluid is a polyorganosiloxane.  
     
     
         12 . A composition according to  claim 11  wherein said silicone resin, gum, or fluid is a polydimethylsiloxane, a polymethylhydrogensiloxane, a polysilsesquioxane, a polytrimethylsiloxane, a polydimethylcyclosiloxane, or combinations of two or more thereof.  
     
     
         13 . A composition according to  claim 8  wherein said silicone resin, gum, or fluid is a polyorganosiloxane.  
     
     
         14 . A composition according to  claim 9  wherein said silicone resin, gum, or fluid is a polydimethylsiloxane, a polymethylhydrogensiloxane, a polysilsesquioxane, a polytrimethylsiloxane, a polydimethylcyclosiloxane, or combinations of two or more thereof.  
     
     
         15 . A composition according to  claim 10  wherein said silicone resin, gum, or fluid is a methoxy-terminated polyakylsiloxane, a hydroxy-terminated polydimethylsiloxane, or combinations of two or more thereof.  
     
     
         16 . A composition according to  claim 15  wherein said silicone resin, gum, or fluid is a polydimethylsiloxane, a polymethylhydrogensiloxane, a polysilsesquioxane, a polytrimethylsiloxane, a polydimethylcyclosiloxane, or combinations of two or more thereof.  
     
     
         17 . A composition according to  claim 16  further comprising modified fumed silica, a surfactant, a fluoropolymer, a wax, a fatty acid, a fatty acid salt, a finely dispersed solid, an emulsifier, a biocide, a corrosion inhibitor, or combinations of two or more thereof.  
     
     
         18 . A process comprising combining a solvent, a silicone resin or silicone gum or silicone fluid, and optionally a catalyst, a co-solvent, or both to produce a mold release composition; applying said composition on or onto a mold, and optionally curing said composition wherein said solvent is a volatile siloxane.  
     
     
         19 . A process according to  claim 18  wherein said solvent has the formula of R(R 2 SiO) x SiR 3  or (R 2 SiO) y  wherein each R is independently a halogen, an alkyl group, alkoxy group, a phenyl group, a phenoxy group, or combinations of two or more thereof having 1 to about 10 carbon atoms per group.  
     
     
         20 . A process according to  claim 18  wherein said solvent is hexamethyldisiloxane, hexamethylcyclotrisiloxane, 2,5-dichloro-1,1,3,3,5,5,-hexamethyltrisiloxane, 1,3-dimethyltetramethoxydisiloxane, 1,1,1,3,5,5,5,-heptamethyltrisiloxane, 3-(heptafluoropropyl)trimethysiloxane, octamethyltrisiloxane, octamethylcyclotetrasiloxane, decamethyltetrasiloxane, decamethylcyclopentasiloxane, dodecamethylpentasiloxane, dodecamethylcyclohexasiloxane, or combinations of two or more thereof.  
     
     
         21 . A process according to  claim 20  wherein said solvent is octamethyltrisiloxane, octamethylcyclotetrasiloxane, decamethyltetrasiloxane, or combinations of two or more thereof.  
     
     
         22 . A process according to  claim 21  wherein said catalyst is a titanium compound, dibutyltin diacetate, or combinations thereof.  
     
     
         23 . A process according to  claim 20  wherein said silicone resin, gum, or fluid is a methoxy-terminated polyakylsiloxane, a hydroxy-terminated polydimethylsiloxane, or combinations of two or more thereof.  
     
     
         24 . A process according to  claim 21  wherein said silicone resin, gum, or fluid is a polydimethylsiloxane, a polymethylhydrogensiloxane, a polysilsesquioxane, a polytrimethylsiloxane, a polydimethylcyclosiloxane, or combinations of two or more thereof.  
     
     
         25 . A process according to  claim 24  further comprising modified fumed silica, a surfactant, a fluoropolymer, a wax, a fatty acid, a fatty acid salt, a finely dispersed solid, an emulsifier, a biocide, a corrosion inhibitor, or combinations of two or more thereof.  
     
     
         26 . A process according to  claim 24  wherein said process comprises combining said solvent, said silicone resin or silicone gum or silicone fluid, and said catalyst and said co-solvent.  
     
     
         27 . A process according to  claim 26  further comprising curing said composition.  
     
     
         28 . A process according to  claim 27  further comprising introducing a molding material into or onto said mold, converting said material into a molded article, and recovering said article.