Polysaccharide-based impregnated solid material with improved stability, processes for the preparation thereof and impregnating solutions used

A polysaccharide-based solid material comprising at least one active agent, wherein the active agent is selected from the group consisting of a bactericidal active agent, a fungicidal active agent, an insecticidal active agent, and a flame-retardant active agent;

• and said active agent comprises, by weight, more than 50% of at least one compound selected from the group consisting of boron, boron derivatives, silica, silica derivatives, aluminum, aluminum derivatives, aluminosilicate derivatives, phosphorus, phosphorus derivatives, iodine, oxygenated iodine derivatives, and mixtures thereof, and at least one complexing agent at least partly complexing the active agent
• wherein said material further comprises a polymeric matrix optionally forming bonds with functional groups of the polysaccharide,
• and,
• wherein the polymeric matrix is an epoxy matrix obtained by in-situ crosslinking of a polyethylene glycol diglycidyl ether in the presence of amine or hydroxyl functions, in the presence of diamines, and in presence of at least one chelating agent containing a primary or secondary amine which is NMG, THAM or a mixture thereof.

A method for treating a polysaccharide based material, comprising:

• preparing a solution of at least one bactericidal or fungicidal or insecticidal or flame-retardant active agent;
• preparing a solution of at least one complexing agent of said active agent;
• impregnating the polysaccharide based material by the solution of complexing agent;
• impregnating the polysaccharide based material by the solution of active agent;
• and
• heating said material after impregnating by the solution of complexing agent, and after impregnating by the solution of active agent,
• wherein impregnation by the solution of complexing agent and impregnation by the solution of active agent are carried out simultaneously,
• and wherein the active agent comprises boron or a boron compound, and the complexing agent of boron is selected from one of the groups consisting of:
• N-methyl-D-glucamine (NMG), tris(hydroxymethyl)aminomethane (THAM), 1,3-bistris(hydroxymethyl)methylamino]propane, (hydroxyethyl)amine, di(hydroxyethyl)amine, iminodicarboxylic acids, imino diacetic acid and mixtures thereof;
• and
• epichlorohydrin, polyethyleneglycol diglycidyl ethers, compounds of formula Cl—CH2CH(OH)—N(CH3)—(CHOH)5—CH2OH, Cl—CH2CH(OH)—NH—C—(CHOH)3 and mixtures thereof.

A method for treating a polysaccharide based material, comprising:

• preparing a solution of at least one bactericidal or fungicidal or insecticidal or flame-retardant active agent;
• preparing a solution of at least one complexing agent of said active agent;
• impregnating the polysaccharide based material by the solution of complexing agent;
• impregnating the polysaccharide based material by the solution of active agent;
• and
• heating said material after impregnating by the solution of complexing agent, before or after impregnating by the solution of active agent,
• wherein the solution of complexing agent contains the complexing agent in the form of a water-soluble monomer containing said complexing agent,
• and wherein the monomer is a (N-glucidol-N-methyl)-2-hydroxypropyl methacrylate (GMHP) obtained by reaction of glycidyl methacrylate and the complexing agent N-methyl D-glucamine (NMG).

A method for treating a polysaccharide based material, comprising:

• preparing a solution of at least one bactericidal or fungicidal or insecticidal or flame-retardant active agent;
• preparing a solution of at least one complexing agent of said active agent;
• impregnating the polysaccharide based material by the solution of complexing agent;
• impregnating the polysaccharide based material by the solution of active agent;
• and
• heating said material after impregnating by the solution of complexing agent, before or after impregnating by the solution of active agent,
• wherein the solution of complexing agent contains a polyethylene diglycidylether, and the complexing agent has a primary or secondary amino group.

A method for treating a polysaccharide based material, comprising:

• preparing a solution of at least one bactericidal or fungicidal or insecticidal or flame-retardant active agent;
• preparing a solution of at least one complexing agent of said active agent;
• impregnating the polysaccharide based material by the solution of complexing agent;
• impregnating the polysaccharide based material by the solution of active agent;
• and
• heating said material after impregnating by the solution of complexing agent, before or after impregnating by the solution of active agent,
• wherein the solution of complexing agent contains the complexing agent in the form of (N-glucidol-N-methyl)-2-hydroxypropyl methacrylate (GMHP) and a polyalkylacrylate at least partly soluble in water.

A method for treating a polysaccharide based material, comprising:

• preparing a solution of at least one bactericidal or fungicidal or insecticidal or flame-retardant active agent;
• preparing a solution of at least one complexing agent of said active agent;
• impregnating the polysaccharide based material by the solution of complexing agent;
• impregnating the polysaccharide based material by the solution of active agent;
• and
• heating said material after impregnating by the solution of complexing agent, and after impregnating by the solution of active agent,
• wherein impregnation by the solution of complexing agent and impregnation by the solution of active agent are carried out simultaneously,
• and wherein:
• the solution of complexing agent is a solution which contains the compound of formula ClCH2CH(OH)CH2NHC(CHOH)3, the pH of which is between 8 and 12, and which is obtained by:
• dissolution of 0.05 to 0.50 mol of THAM in 50 to 500 ml of water,
• addition of 0.06 to 0.60 mol of epichlorohydrin, and
• stirring of the solution thus obtained, for one hour at ambient temperature,
• the heating is carried out at between 50 and 70° C. for 0.5 to 24 hours;
• and
• the solution of active agent is a 0.33 M aqueous solution of boric acid, the pH of which has gone from 4.68 to 10 through the addition of 4.58 ml of NaOH (50%);
• and
• the impregnation is carried out under partial vacuum.

A method for treating a polysaccharide based material, comprising:

• preparing a solution of at least one bactericidal or fungicidal or insecticidal or flame-retardant active agent;
• preparing a solution of at least one complexing agent of said active agent;
• impregnating the polysaccharide based material by the solution of complexing agent;
• impregnating the polysaccharide based material by the solution of active agent;
• and
• heating said material after impregnating by the solution of complexing agent, and after impregnating by the solution of active agent,
• wherein impregnation by the solution of complexing agent and impregnation by the solution of active agent are carried out simultaneously,
• and wherein the active agent and the complexing agent are in the same solution which contains:
• from 0.2% to 2.5% of H3BO3;
• from 10% to 40% of GMHP in solution;
• and
• from 0.1% to 2.5% of a thermoinitiator.