Drinking cups made from cardboard coated with printing layer and crosslinked polysiloxane layer

Abstract

The invention relates to drinking cups comprising a sidewall that is composed of a multilayer cardboard comprising one or more crosslinked polysiloxane layers [A]; a pigment coating or barrier coating layer [B]; a fiber based substrate layer [C]; optionally, a pigment coating layer [D]; a printed layer [E] comprising a printed image and/or decoration; and optionally, one or more crosslinked polysiloxane layers [F]. The multilayer cardboard preferably has a Cobb 600 value determined according to EN ISO 535 of at least 0.2 g·m 2 . Preferably, the multilayer cardboard has a total content of polyolefins of at most 5.0 wt.-%, relative to the total weight of the multilayer cardboard.

1 . A drinking cup for receiving a beverage, a sidewall having a rim, and a bottom, wherein the sidewall has a first edge and a second edge which are arranged in an overlapping manner at a side seam area; wherein the sidewall is composed of a multilayer cardboard further comprising:
 one or more crosslinked polysiloxane layers [A] having a total area weight, determined according to EN ISO 536, within the range of from 0.1 to 50 g·m −2 ;   a pigment coating or barrier coating layer [B] having an area weight, determined according to EN ISO 536, within the range of from 0.1 to 50 g·m −2 ;   a fiber based substrate layer [C] having an area weight, determined according to EN ISO 536, within the range of from 50 to 750 g·m 2 ;   optionally, a pigment coating layer [D] having an area weight, determined according to EN ISO 536, within the range of from 0.1 to 50 g·m −2 ;   a printed layer [E] comprising at least one of a printed image and a decoration; and   optionally, one or more crosslinked polysiloxane layers [F] having a total area weight, determined according to EN ISO 536, within the range of from 0.1 to 50 g·m 2 ;   
       wherein the one or more crosslinked polysiloxane layers [A] face the interior of the drinking cup. 
     
     
         2 . The drinking cup according to  claim 1 , which has a total content of polyolefins of at most 5.0 wt.-%, relative to a total weight of the multilayer cardboard. 
     
     
         3 . The drinking cup according to  claim 1 , wherein the one or more crosslinked polysiloxane layers [A], the pigment coating or barrier coating layer [B], the fiber based substrate layer [C], the pigment coating layer [D], if present, the printed layer [E], and the one or more crosslinked polysiloxane layers [F], if present, are arranged in alphabetical order. 
     
     
         4 . (canceled) 
     
     
         5 . (canceled) 
     
     
         6 . (canceled) 
     
     
         7 . The drinking cup according to  claim 1 , wherein the one or more crosslinked polysiloxane layers [A] are in direct contact with the pigment coating or barrier coating layer [B]. 
     
     
         8 . The drinking cup according to  claim 1 , wherein the printed layer [E] is in direct contact with the fiber based substrate layer [C] or the optionally present pigment coating layer [D]. 
     
     
         9 . (canceled) 
     
     
         10 . (canceled) 
     
     
         11 . (canceled) 
     
     
         12 . (canceled) 
     
     
         13 . The drinking cup according to  claim 1 , wherein the fiber based substrate layer [C] comprises cellulose fibers. 
     
     
         14 . The drinking cup according to  claim 1 , wherein the fiber based substrate layer [C] has an area weight, determined according to EN ISO 536, within the range of 200±100 g·m −2 , or 225±100 g·m −2 , or 250±100 g·m −2 , or 275±100 g·m −2 , or 300±100 g·m −2 , or 325±100 g·m −2 , or 350±100 g·m −2 , or 375±100 g·m −2 , or 400±100 g·m −2  or 425±100 g·m −2 , or 450±100 g·m −2 . 
     
     
         15 . (canceled) 
     
     
         16 . The drinking cup according to  claim 1 , wherein the pigment coating or barrier coating layer [B] and the optionally present pigment coating layer [D] independently of one another comprise a pigment selected from the group consisting of kaolin, feldspar, mica, calcined kaolin, clay, natural clay, delaminated clay, calcined clay, calcium carbonate, chalk, ground calcium carbonate, precipitated calcium carbonate, prespite calcium carbonate, talc, gypsum, aluminum trihydrates, titanium dioxide, zinc sulfide, zinc oxide, calcium sulfite, barium sulfate, magnesium hydroxide, amorphous silica, silicates, plastic pigments, and combinations thereof. 
     
     
         17 . (canceled) 
     
     
         18 . (canceled) 
     
     
         19 . (canceled) 
     
     
         20 . The drinking cup according to claim  18 , wherein:
 the pigment coating or barrier coating layer [B] and the optionally present pigment coating layer [D] independently of one another each comprise a binder,   each of the pigment coating or barrier coating layer [B] and the optionally present pigment coating layer [D] independently of one another comprise, relative to a total weight of the pigment coating or barrier coating layer [B] and the optionally present pigment coating layer [D]:
 the binder within a range of from 5.0 to 20 wt.-%, and 
 the pigment within a range of from 80 to 95 wt.-%. 
   
     
     
         21 . The drinking cup according to  claim 1 , wherein the pigment coating or barrier coating layer [B] and the optionally present pigment coating layer [D] independently of one another have an area weight, determined according to EN ISO 536, within the range of 10.0±5.0 g·m −2 , or 12.5±5.0 g·m −2 , or 15.0±5.0 g·m −2 . 
     
     
         22 . (canceled) 
     
     
         23 . The drinking cup according to  claim 1 , wherein the pigment coating or barrier coating layer [B] is provided in the form of a barrier coating layer [B], and the barrier coating layer [B] is free of polyolefins. 
     
     
         24 . The drinking cup according to  claim 1 , wherein the printed layer covers at least 40% of an area of the multilayer cardboard. 
     
     
         25 . (canceled) 
     
     
         26 . (canceled) 
     
     
         27 . The drinking cup according to  claim 1 , wherein the one or more crosslinked polysiloxane layers [A] and the optionally present one or more crosslinked polysiloxane layers [F] independently of one another: do not contain a pigment selected from the group consisting of kaolin, feldspar, mica, calcined kaolin, clay, natural clay, delaminated clay, calcined clay, calcium carbonate, chalk, ground calcium carbonate, precipitated calcium carbonate, prespite calcium carbonate, talc, gypsum, aluminum trihydrates, titanium dioxide, zinc sulfide, zinc oxide, calcium sulfite, barium sulfate, magnesium hydroxide, amorphous silica, silicates, plastic pigments, and combinations thereof; and do not contain any pigment or mineral filler. 
     
     
         28 . (canceled) 
     
     
         29 . The drinking cup according to  claim 1 , wherein the one or more crosslinked polysiloxane layers [A] and the optionally present one or more crosslinked polysiloxane layers [F] independently of one another are each derived from a sol-gel composition and the sol-gel composition comprises a non-functionalized silane of general formula (I) 
       
         
           
           
               
               
           
         
       
       wherein R1 means —C 1-18 -alkyl, —C(═O)—C 1-18 -alkyl, or —C 6-12 -aryl; and R2, R3 and R4 independently of one another mean —C 1-18 -alkyl, —C 3-8 -cycloalkyl, —O—C 1-18 -alkyl, —O—C 3-8 -cycloalkyl, —O—C(═O)—C 1-18 -alkyl, —C 6-12 -aryl, or —O—C 6-12 -aryl. 
     
     
         30 . (canceled) 
     
     
         31 . The drinking cup according to  claim 1 , wherein the one or more crosslinked polysiloxane layers [A] and the optionally present one or more crosslinked polysiloxane layers [F] independently of one another are each derived from a sol-gel composition and the sol-gel composition comprises a non-functionalized silane of general formula (II) 
       
         
           
           
               
               
           
         
       
       wherein R5 means —C 1-18 -alkyl-Si(O—C 1-6 -alkyl) 3 . 
     
     
         32 . The drinking cup according to  claim 1 , wherein the one or more crosslinked polysiloxane layers [A] and the optionally present one or more crosslinked polysiloxane layers [F] independently of one another are each derived from a sol-gel composition and the sol-gel composition comprises a non-functionalized alkyl trialkoxy silane oligomer of general formula (III) 
       
         
           
           
               
               
           
         
       
       wherein R6, R7 and R8 independently of one another mean —C 1-6 -alkyl; and R9 means —C(═O)—O— or —NH—C(═O)—O. 
     
     
         33 . The drinking cup according to  claim 1 , wherein the one or more crosslinked polysiloxane layers [A] and the optionally present one or more crosslinked polysiloxane layers [F] independently of one another are each derived from a sol-gel composition and the sol-gel composition comprises a functionalized silane of general formula (IV) 
       
         
           
           
               
               
           
         
       
       wherein
 R10 means —C 1-18 -alkyl, —C(═O)—C 1-18 -alkyl, or —C 6-12 -aryl; 
 R11 means —CH═CH 2 , —C 1-18 -alkyl-NH 2 , —C 1-18 -alkyl-NH—C 1-6 -alkyl, —C 1-18 -alkyl-NH—C 1-6 -alkyl-NH 2 , —C 1-18 -alkyl-NH—C 1-6 -alkyl-NH—C 1-6 -alkyl-NH 2 , —C 1-18 -alkyl-NH—C 3-8 -cycloalkyl, —C 1-18 -alkyl-C 6-10 -aryl-NH 2 , —C 1-18 -alkyl-imidazolinyl, —C 1-18 -alkyl-NH—C(═O)—NH 2 , —C 1-18 -alkyl-glycidoxy, —C 1-18 -alkyl-acryloxy, —C 1-18 -alkyl-methacryloxy, —C 1-18 -alkyl-NCO, —C 1-18 -alkyl-NH—C(═O)—O—C 1-6 -alkyl, or —C 1-18 -alkyl-O—C(═O)—NH—C 1-6 -alkyl; 
 R12 and R13 independently of one another mean —C 1-18 -alkyl, —C 3-8 -cycloalkyl, —O—C 1-8 -alkyl, —O—C 3-8 -cycloalkyl, —O—C(═O)—C 1-18 -alkyl, —C 6-12 -aryl, or —O—C 6-12 -aryl. 
 
     
     
         34 . (canceled) 
     
     
         35 . The drinking cup according to  claim 1 , wherein the one or more crosslinked polysiloxane layers [A] and the optionally present one or more crosslinked polysiloxane layers [F] independently of one another are each derived from a sol-gel composition and the sol-gel composition comprises a metal alcoholate. 
     
     
         36 . The drinking cup according to  claim 1 , wherein the one or more crosslinked polysiloxane layers [A] and the optionally present one or more crosslinked polysiloxane layers [F] independently of one another are each derived from a sol-gel composition and the sol-gel composition comprises at least one of:
 one or more tetraalkoxy silanes;   one or more glycidoxyalkyl trialkoxy silanes;   one or more polyols; and   one or more metal alcoholates.   
     
     
         37 . (canceled) 
     
     
         38 . The drinking cup according to  claim 1 , wherein the one or more crosslinked polysiloxane layers [A] and the optionally present one or more crosslinked polysiloxane layers [F] independently of one another are each derived from a sol-gel composition and the sol-gel composition comprises:
 optionally, one or more tetraalkoxy silanes;   one or more glycidoxyalkyl trialkoxy silanes;   one or more fluoroalkyl trialkoxy silanes; and   optionally, one or more metal alcoholates.   
     
     
         39 . The drinking cup according to  claim 1 , wherein the one or more crosslinked polysiloxane layers [A] and the optionally present one or more crosslinked polysiloxane layers [F] independently of one another are each derived from a sol-gel composition and the sol-gel composition comprises:
 one or more tetraalkoxy silanes; and   one or more vinyl trialkoxy silanes.   
     
     
         40 . The drinking cup according to  claim 1 , wherein the one or more crosslinked polysiloxane layers [A] and the optionally present one or more crosslinked polysiloxane layers [F] independently of one another are each derived from a sol-gel composition and the sol-gel composition comprises:
 optionally, one or more tetraalkoxy silanes;   acryloxyalkyl trialkoxy silanes;   optionally, a reactive diluent; and   optionally, one or more metal alcoholates.   
     
     
         41 . (canceled) 
     
     
         42 . The drinking cup according to  claim 1 , wherein a content of crosslinked polysiloxane in the one or more crosslinked polysiloxane layers [A] and the optionally present one or more crosslinked polysiloxane layers [F] independently of one another is at least 35 wt.-%, relative to a total weight of the one or more crosslinked polysiloxane layers [A] and the optionally present one or more crosslinked polysiloxane layers [F]. 
     
     
         43 . The drinking cup according to  claim 1 , wherein the one or more crosslinked polysiloxane layers [A] and the optionally present one or more crosslinked polysiloxane layers [F] independently of one another have a total area weight, determined according to EN ISO 536, of not more than 25 g·m 2 . 
     
     
         44 . (canceled) 
     
     
         45 . The drinking cup according to  claim 1 , wherein the one or more crosslinked polysiloxane layers [A] and the optionally present one or more crosslinked polysiloxane layers [F] independently of one another are transparent. 
     
     
         46 . The drinking cup according to  claim 1 , wherein at least one of (a) the surface of the side seam area that faces the interior and (b) the surface of the side seam area that is opposite the interior is sealed with a primer; and wherein the surface of the side seam area that is opposite the interior is an exterior of the drinking cup. 
     
     
         47 . (canceled) 
     
     
         48 . The drinking cup according to  claim 1 , wherein the multilayer cardboard comprises the layer [A], the layer [B], the layer [C] and the layer [E]; wherein a strip of primer is arranged along the side seam area that is formed in an overlapping manner by a section at the first edge and a section at the second edge of one and the same multilayer cardboard; wherein the drinking cup is arranged in at least one of the following configurations:
 the layer [E] only partially covers the layer [C] along the side seam area at the first edge and the strip of primer along the side seam area is applied on top of the layer [C] at the first edge; and   the layer [A] only partially covers the layer [B] along the side seam area at the second edge and the strip of primer along the side seam area is applied on top of the layer [B] at the second edge.   
     
     
         49 . (canceled) 
     
     
         50 . (canceled) 
     
     
         51 . The drinking cup according to  claim 1 , wherein the multilayer cardboard has a Cobb 600 value determined according to EN ISO 535 of at least 0.1 g·m −2  and at most 5.0 g·m −2 , wherein the Cobb 600 value is measured on a side of the drinking cup that forms an inside of the drinking cup. 
     
     
         52 . (canceled) 
     
     
         53 . (canceled) 
     
     
         54 . The drinking cup according to  claim 1 , wherein the multilayer cardboard has a Cobb 600 value determined according to EN ISO 535 of at least 0.8 g·m −2  and at most 44 g·m −2 , wherein the Cobb 600 value is measured on a side of the drinking cup that forms an outside of the drinking cup. 
     
     
         55 . (canceled) 
     
     
         56 . (canceled) 
     
     
         57 . (canceled) 
     
     
         58 . The drinking cup according to  claim 1 , wherein
 (i) the drinking cup has a total content of polyolefins of at most 5.0 wt.-%, relative to a total weight of the multilayer cardboard; and   (ii) the one or more crosslinked polysiloxane layers [A] and the optionally present one or more crosslinked polysiloxane layers [F] independently of one another have a total area weight, determined according to EN ISO 536, of not more than 25 g·m −2 ; and   (iii) a content of crosslinked polysiloxane in the one or more crosslinked polysiloxane layers [A] and the optionally present one or more crosslinked polysiloxane layers [F] independently of one another is at least 35 wt.-%, relative to a total weight of the one or more crosslinked polysiloxane layers [A] and the optionally present one or more crosslinked polysiloxane layers [F].   
     
     
         59 . A process for the preparation of a drinking cup, the process comprising the steps of:
 (a) providing a laminate of:
 a pigment coating or barrier coating layer [B] having an area weight, determined according to EN ISO 536, within the range of from 0.1 to 50 g·m −2 ; 
 a fiber based substrate layer [C] having an area weight, determined according to EN ISO 536, within the range of from 50 to 750 g·m −2 ; and 
 optionally, a pigment coating layer [D] having an area weight, determined according to EN ISO 536, within the range of from 0.1 to 50 g·m −2 ; 
   (b) applying at least one of a printed image and a decoration to (i) the surface of the fiber based substrate layer [C] or (ii), when the laminate comprises the optional pigment coating layer [D], to (ii) the surface of the pigment coating layer [D], thereby providing a printed laminate of:
 the pigment coating or barrier coating layer [B] having an area weight, determined according to EN ISO 536, within the range of from 0.1 to 50 g·m −2 ; 
 the fiber based substrate layer [C] having an area weight, determined according to EN ISO 536, within the range of from 50 to 750 g·m −2 ; 
 optionally, the pigment coating layer [D] having an area weight, determined according to EN ISO 536, within the range of from 0.1 to 50 g·m −2 ; and 
 the printed layer [E] comprising at least one of the printed image and the decoration; 
   (c) applying a sol-gel composition to the surface of the pigment coating or barrier coating layer [B] and optionally also to the surface of the printed layer [E], independently of one another as a single layer or a multitude of layers; wherein the sol-gel composition comprises at least one of a crosslinkable non-functionalized silane and a crosslinkable functionalized silane;   (d) crosslinking at least one of the non-functionalized silane and the functionalized silane;   (e) optionally, drying the sol-gel composition; and   (f) obtaining an element from the thus obtained laminated cardboard and forming the drinking cup from the element.   
     
     
         60 . (canceled) 
     
     
         61 . (canceled) 
     
     
         62 . (canceled)