Fibre-based support containing a layer of a functionalized watersoluble polymer, method of production and use thereof
A cellulose and/or synthetic fiber-based support of which at least one surface is coated with a layer containing at least one water-soluble polymer comprising hydroxyl or primary-secondary amino functional groups, at least some of which have been functionalized beforehand with at least one organic compound comprising at least one epoxy functional group, and at least one R 1 group wherein R 1 is a vinyl functional group or at least one Si(R 2 )3 functional group and wherein R 2 =hydrogen atom, hydroxyl, alkoxy, alkyl, and combinations thereof.
1. A method for producing a coated cellulose and/or synthetic fibre-based support which comprises a cellulose and/or synthetic fiber-based support sheet and a coating layer on at least one surface of the support sheet, wherein the method comprises the steps of:
(a) forming a cellulose and/or synthetic fibre-based support sheet with or without a parchementizing process;
(b) functionalizing at least one water-soluble polymer comprising hydroxyl or primary-secondary amino functional groups by grafting at least one organic molecule comprising at least one epoxy group and at least one R 1 functional group onto the water-soluble polymer, wherein R 1 is a vinyl group or at least one —Si(R 2 ) 3 functional group, where R 2 is selected from the group consisting of hydrogen, hydroxyl, alkoxy, alkyl, and combinations thereof;
(c) coating the cellulose and/or synthetic fibre-based support sheet obtained according to step (a) with a layer comprising the at least one functionalized water-soluble polymer obtained according to step (b) to obtain the coated cellulose and/or synthetic fibre-based support; and
(d) optionally calendering or supercalendering the coated cellulose and/or synthetic fibre-based support.
2. The method as recited in claim 1 , wherein the organic molecule is prepared from a chloro-hydrin precursor.
3. The method as recited in claim 1 , wherein the water-soluble polymer is functionalized according to step (b) at a temperature between 20 and 95° C. in an aqueous medium and in the presence of an organic or inorganic acid or base.
4. The method as recited in claim 1 , wherein step (c) is practiced by a coating technique selected from the group consisting of size-press coating, metering-size-press coating, foulard coating, rod coating, “Champion” bar coating, “Meyer” bar coating, air-knife coating, gravure coating, scraper blade coating, sliding blade coating, single- and multilayer curtain coating, reverse roll coating, spray coating, atomisation coating, liquid application system (LAS) coating, kiss coating, and foam coating.
5. The method as recited in claim 1 , wherein the coating of the cellulose and/or synthetic fibre-based support according to step (c) is carried out at a temperature between 20 and 95° C.
6. The method as recited in claim 1 , wherein the at least one organic compound is grafted onto the water-soluble polymer via the at least one epoxy functional group by an alkylation reaction.