Glossy paper

Abstract

The invention concerns a glossy or scintillating paper provided with a roughness more than 30 ml/mm measured in accordance with the ISO 8791-2 standard, entirely manufactured on a paper machine, and characterized in that it comprises reflecting microplates or microbeads of dimensions less than 300μ incorporating at least one optically transparent material in their structure.

1 . A glossy or scintillating paper with a roughness greater than 30 ml/min measured in accordance with ISO 8791-2 standard, produced entirely on a paper machine, said paper including reflecting microplatelets or microbeads with size less than 300 μm incorporating at least one optically transparent material in their structure. 
   
   
       2 . The glossy or scintillating paper as claimed in  claim 1 , wherein the roughness is greater than 100 ml/min in accordance with ISO 8791-2 standard and the reflecting microplatelets or microbeads are incorporated at a rate of at least 0.05%, preferably at least 0.15% by dry weight based on the finished paper. 
   
   
       3 . The glossy or scintillating paper as claimed in  claim 1 , obtained by coating with a treatment composition containing reflecting microplatelets or microbeads as well as at least one polymeric binder, which treatment composition enables said microplatelets or microbeads to be incorporated at a rate of at least 0.05% and preferably at least 0.15% by dry weight based on the finished paper, as well as said polymeric binder at a rate of at least 0.1% and preferably more than 1% by dry weight based on the paper weight. 
   
   
       4 . The glossy or scintillating paper as claimed in  claim 3 , obtained by coating with a treatment composition containing a dry binder weight at least equal to the weight of reflecting microplatelets or microbeads. 
   
   
       5 . The glossy or scintillating paper as claimed in  claim 4 , wherein the binder employed is chosen from the family of polyvinyl alcohols, acrylic latices or polyvinylpyrrolidones. 
   
   
       6 . The glossy or scintillating paper as claimed in  claim 3 , wherein the treatment composition is coated by means of equipment possessing at least one roller, for example of the size press, “Massey”, “gate-roll” or “BMSP” type. 
   
   
       7 . The glossy or scintillating paper as claimed in  claim 3 , and which can be colored, textured, watermarked, laid, marked with felts or engraved presses, so as to give embossing or non-uniformity to the paper inside the paper machine, before the treatment formulation is applied to its surface. 
   
   
       8 . A method for obtaining a glossy or scintillating paper with a roughness greater than 30 ml/min measured in accordance with ISO 8791-2 standard, produced on a paper machine in a single step, characterized by the following successive steps:
 producing a substrate paper,   coating said substrate with a treatment composition comprising reflecting microplatelets or microbeads with a size less than 300 μm incorporating at least one optically transparent material in their structure, and containing at least one polymeric binder in a dry quantity at least equal to that of said microplatelets or said microbeads,   drying said composition and reeling the finished paper.   
   
   
       9 . The method for obtaining a glossy or scintillating paper as claimed in  claim 8 , wherein the substrate can be colored, textured, watermarked, laid, marked with felts or engraved presses, so as to give embossing or non-uniformity to the paper inside the paper machine, before the treatment formulation is applied to its surface. 
   
   
       10 . The method for obtaining a glossy or scintillating paper as claimed in  claim 8 , wherein the treatment composition is applied by means of a coating device possessing at least one roller, for example of the size press, “Massey”, “gate-roll” or “BMSP” type, making it possible to incorporate in the paper a quantity of at least 0.05% and preferably at least 0.15% by dry weight of said microplatelets or microbeads based on the finished paper, as well as at least one polymeric binder at a rate of at least 0.5% and preferably more than 1% by dry weight based on the paper weight.