$^{29 }$Sekine, M.; Hata. T. J Chem. Soc. Chem Commun. 1978, 285 

$^{30 }$Lecouvey, M.; Leroux, Y. Heteroatom Chem. 2000, 11(7), 556-561 

$^{31 }$Sekine, M.; Okimoto, K.; Yamada, K.; Hata, T. J. Org. Chem. 1981, 46, 2097-2107 

$^{32 }$Guenin. E.; Degache. E.; Liquier, J.; Lecouvey, M. Eur. J. Org. Chem. 2004, 2983-2987 

[0046] A special embodiment of these blends is that between the polymers and the low molecular phosphonic acids ionic cross-links may be formed, for instance between the cation exchange groups of the polymer with a basic group (e.g. pyridine moiety) of the low molecular phospho› nic acid compound, see FIG. 8. Another possibility of bonding of the low molecular hydroxymethylenephosphonic acids on the polymers is a covalent cross-link, for instance by crosslinking of the OH-group of the phosphonic acid compoand with an OH-group of the polymer via a ’v’,T› dihalogene alcane, see FIG. 9. Other possible cross-linking reactions for the OH-group of the l-hydroxymethylene-1,1- bisphosphonic acid group and if necessary with OH-groups of polymers according to the invention are: 

[0047] Cross-linking by addition of AgNO$_{3 }$ to the mix› ture of I-hydroxy methylene-1,1-bisphosphonic acid containing OH-groups and if necessary polymers con› taining OH-groups ander hydrothermal conditions and reduction of AgNO$_{3 }$ to elemental silver nanoparticles and liberation of HNO/ 3 (FIG. 10 concerning the cross-linking of OH-groups of different l-hydroxym› ethylene-1, 1-bisphosphonic acid molecules, if neces› sary by formation of never ending 3D networks by use of molecules with several l-hydroxymethylene-1, 1- bisphosphonic acid groups); 

$^{33 }$Luo, L.-B.; Yu, S.-H.; Qian, H.-S.; Zhou, T. J. Am. Chem. Soc. 2005, 127, 2822 

[0048] Cross-linking of l-hydroxymethylene-1,1-bis› phosphonic acids with OH groups containing polymers by use of epichlorhydrine as cross-linker (FIG. 11)3 4 • 35 ; 

$^{34 }$Wang, Z.; Luo, J.; Zhu, X. X.; Jin, S.; Tomaszewski, M. J. J. Comb. Chem. 2004, 6, 961-966 

$^{35 }$Wan, Y.; Huang, W. Q.; Wang, Z.; Zhu, X. X. Polymer 2004, 45(1), 71-77 

[0049] Cross-linking of OH groups of l-hydroxymeth› ylene-1,1-bisphosphonic acids and if necessary of OH groups of the polymer with glutaraldehyde 36 ; 

$^{36 }$Zhao, D.; Liao, G.; Gao, G.; Liu, F. Macromolecules 2006, published on Web Jan. 12, 2006, http://pubs.acs.org/cgi-bin/asap.cgi/mamobx/ asap/pdf/ma0524191.pdf 

[0050] Cross-linking of OH groups of l-hydroxymeth› ylene-1,1-bisphosphonic acids and if necessary of OH groups of the polymer with melamine-formaldehyd cross-linker 37 ; 

$^{37 }$Benson, M. T. Ind. Eng. Chem. Res. 2003, 42, 4147-4155 

[0051] Cross-linking of OH groups of l-hydroxymeth› ylene-1,1-bisphosphonic acids and if necessary of OH groups of the polymers after reaction of the OH groups with Zcinnamon acid chloride by photocross-linking (cycloaddition) under UV light3 8 ; 

$^{38 }$Hu, Y; Gamble, V; Painter, P. C.; Coleman, M. M. Macromolecules 2002, 35, 1289-1298 

[0052] Cross-linking of OH groups of l-hydroxymeth› ylene-1,1-bisphosphonic acids and if necessary of OH groups of the polymer with polyvalent cations, e.g. ca2+ 39; 

$^{39 }$Bonapasta, A. A.; Buda, F., Colombet, P.; Guerrini, G. Chem. Mater. 2002, 14, 1016-1022 

[0053] In principal all types of cross-linking reactions which rely on cross-linking reactions of OH groups are applicable to the l-hydroxymethylene-1, 1-bisphospho- 

nic acids according to the invention and if necessary OH groups containing polymers. 

[0054] Covalent cross-linking prevents diffusion of the phosphonic acid compound out of the polymer and increases the mechanical stability of the blended films. 

[0055] By the above described covalent cross-linking pro› cesses interpenetrating network (IPN) of the most different structure and composition can be formed. An example of this follows below. Exemplarily the following components are dissolved in an aprotic solvent such as N-methylpyrrolidone (NMP), N,N-dimethylacetamide (DMAc), N,N-dimethyl› formamide (DMF) or dimethylsulfoxide (DMSO): a poly› mer with sulfochloride groups, a cross-linker for sulfochlo› ride groups like 4,4’-diaminodiphenylsulfone 40 , a bifunctional l-hydroxymethylene-1, 1-bisphosphonic acid like 1,4-bis(l-hydroxymethylene-1,1-bisphosphonic acid) benzene and a cross-linker for the OH groups of l-hy› droxymethylene-1,1-bisphosphonic acid like glutaralde› hyde. After making a homogeneous solution of all components, it is coated on a support with a doctor knife and the solvent is evaporated. An IPN is formed from the network of sulfochlorated polymer with difunctional amine and the network of 1,4-bis(l-hydroxymethylene-l, 1-bispho› sphonic acid)benzene and glutaraldehyde, that can be post› treated by mineral acid (0,1 to 80% H$_{2}$SO$_{4}$ , 0,1 to 37% HCl or 0,1 to 85% phosphoric acid) and if necessary storage in water to remove an excess of mineral acid. An example of a hybride polymer network (HPN) is for example: in a dipolar-aprotic solvent (see above) the following compo› nents are dissolved: a polymer with sulfonate groups (-SO$_{3}$Me) and sulfinate groups (-SO$_{2}$Me) in the salt form with Me representing alkali metal cation, earth alkali metal cation, any ammonium ion, Ag+-Ion, 3-(1-hydroxy-l,1-bis› phosphonic acid)-pyridine, a a,w-dihalogene alcane like 1,4-diiodine butane as cross-linker for the sulfinate groups (S-alkylation of the sulfinate groups 41 ) and as cross-linker for the OH groups of l-hydroxymethylene-1,1-bisphospho› nic acid groups e.g. glutaraldehye 36 . After making a homo› geneous solution of all components, it is coated on a support with a doctor blade and the solvent is evaporated. The formed HPN can be posttreated as follows: 1. Post-treatment in mineral acid (0,1 to 80% H$_{2}$ SO$_{4}$ , 0,1 to 37% HCl or 0,1 to 85% phosphoric acid) and if necessary 2. subsequent storage in water to remove an excess of mineral acid. The formed HPN consists of a covalent network of the polymer with sulfinate and sulfonate groups 42 , whereby the sulfinate groups are cross-linked by S-alkylation with 1,4-diiodine butane and the network of 3-(1-hydroxy-l, 1-bisphosphonic acid)-pyridine and glutaraldehyde. In addition ionic inter› actions exist between both networks between the pyridine groups of 3-(1-hydroxy-l, 1-bisphosphonic acids )-pyridins and the sulfonate groups of the sulfonated polymer. Also the 1,4-diiodine butane cross-linker can cross-link also a part of the pyridine groups by alkylation, whereby mixed cross› linking bridges between the sulfinate groups and the pyri› dine groups are formed 43 . 

$^{40 }$R. Nolte. K. Ledjeff, M. Bauer, R. Miilhaupt, R., J. Memb. Sci. 1993, 83, 211-220 

$^{41 }$Kerres, J.; Cui, W.; Junginger, M. J. Memb. Sci. 1998, 139, 227-241 

$^{36 }$Zhao, D.; Liao, G.; Gao, G.; Liu, F. Macromolecules 2006, published on Web Jan. 12, 2006, http://pubs.acs.org/cgi-bin/asap.cgi/mamobx/asap/pdf/ ma0524191.pdf 

$^{42 }$Kerres. J.; Zhang, W.; Cui, W. J Polym. Sci.: Part A: Polym. Chem. 1998, 36, 1441-1448 

$^{43 }$Kerres, J.; Zhang, W. Tang, C. M. U.S. Pat. No. 6,767,585; granted at 27 Jul. 2004 

