Novel foams and coatings from low crystallinity vinylidene fluoride hexafluoropropylene copolymers

Abstract

Processes for the preparation of adherent polyvinylidene fluoride, hexafluoropropylene coatings on objects of glass, metal, stone, bricks, cementitious objects, mortar, title and the like without the need of primers or alloying polymers and open celled foams from polymers having a Tg below the freezing point of the aqueous phase of the latex (either emulsion or suspension) of their formation are disclosed.

1 - 4 . (canceled)  
   
   
       5 . A process for the adherent coating of a substrate with a vinylidene fluoride, hexafluoropropylene (HFP) based copolymer having low crystallinity which consists of applying an aqueous suspension or emulsion of said polymer to said substrate, evaporating the water and any other volatile materials in said aqueous suspension or emulsion, and then, optionally heating the substrate on which said adherent coating has been applied, said low crystallinity copolymer having a DSC melting point defined by the relationship:  
       Melt Temp. (° C.)=162.16−3.192(HFP wt %)  
     when the copolymer has from 1 to 30 weight % hexafluoropropylene, said copolymer having an endotherm on melting defined by the relationship:  
         ΔH= 54.81−1.53(HFP wt %)  when the copolymer has from greater than 30 up to less than 36 weight % hexafluoropropylene, and said copolymer having a ΔH of melting of zero when the copolymer has from 36 to 66 weight % hexafluoropropylene.    
   
   
       6 . A coated substrate prepared by the process of  claim 5 .  
   
   
       7 . The process of  claim 5  wherein the substrate is selected from the group consisting of metal, glass, stone, brick, tile, cementitious materials, mortar and breathable fabric.  
   
   
       8 . A process for the adherent coating of a substrate selected from the group consisting of natural and synthetic fibers, cloth, paper, leather, and woven and non-woven fabrics with a vinylidene fluoride, hexafluoropropylene copolymer which consists of applying an aqueous suspension or emulsion, of said vinylidene fluoride, hexafluoropropylene copolymer which consists of applying an aqueous suspension or emulsion of said vinylidene fluoride, hexafluoropropylene copolymer to said substrate and evaporating the water and any other volatile materials in said aqueous suspension or emulsion and then, optionally heating the substrate on which said adherent coating has been applied.  
   
   
       9 - 14 . (canceled)  
   
   
       15 . A process for the application of a clear and self adherent polyvinylidene fluoride, hexafluoropropylene HFP) based copolymer film coating on a substrate which comprises (a) applying on said substrate a latex of a polyvinylidene fluoride based polymer which has low internal crystallinity and which contains triethylphosphate; (b) evaporating the aqueous phase of the latex to create the film; and (c) heating the film, wherein said low crystallinity copolymer having a DSC melting point defined by the relationship:  
       Melt Temp. (° C.)=162.16−3.192(HFP wt %)  
     when the copolymer has from 1 to 30 weight % hexafluoropropylene, said copolymer having an endotherm on melting defined by the relationship:  
         ΔH= 54.81−1.53(HFP wt %)  when the copolymer has from greater than 30 up to less than 36 weight % hexafluoropropylene, and said copolymer having a ΔH of melting of zero when the copolymer has from 36 to 66 weight % hexafluoropropylene.    
   
   
       16 . A coated substrate prepared by the process of  claim 15 .  
   
   
       17 . The process of  claim 15  wherein the substrate is selected from the group consisting of metal glass stone, brick tile, cementitious materials and mortar and breathable fabric.  
   
   
       18 . The process of  claim 5  wherein said vinylidene fluoride based polymer is a vinylidene fluoride, hexafluoropropylene copolymer.