US 11,987,718 B2
Coating composition for producing a layer composite
Nora Wilke, Flensburg (DE); and Martin Schreer, Melle (DE)
Assigned to MITSUBISHI HITEC PAPER EUROPE GMBH, Bielefeld (DE)
Appl. No. 16/613,734
Filed by Mitsubishi HiTec Paper Europe GmbH, Bielefeld (DE)
PCT Filed May 18, 2018, PCT No. PCT/EP2018/063065
§ 371(c)(1), (2) Date Dec. 11, 2019,
PCT Pub. No. WO2018/211063, PCT Pub. Date Nov. 22, 2018.
Claims priority of application No. 10 2017 111 022.4 (DE), filed on May 19, 2017; and application No. 10 2017 127 680.7 (DE), filed on Nov. 23, 2017.
Prior Publication US 2020/0354602 A1, Nov. 12, 2020
Int. Cl. C09D 129/04 (2006.01); B41M 5/337 (2006.01); B41M 5/44 (2006.01); C08K 3/013 (2018.01); C08K 3/34 (2006.01); C08K 3/36 (2006.01); C08K 5/00 (2006.01); C09D 123/08 (2006.01); C09D 133/02 (2006.01)
CPC C09D 129/04 (2013.01) [B41M 5/3372 (2013.01); B41M 5/44 (2013.01); C08K 3/013 (2018.01); C08K 3/346 (2013.01); C08K 3/36 (2013.01); C08K 5/0025 (2013.01); C09D 123/08 (2013.01); C09D 133/02 (2013.01)] 2 Claims
 
1. A layer composite comprising:
a carrier layer; and
an enhancement layer, produced from a coating composition, comprising:
an acetoacetyl-modified polyvinyl alcohol;
an alkylene/(meth)acrylic acid copolymer;
wherein the alkylene (methyl) acrylic acid polymer is ethylene/acrylacid copolymer;
a crosslinker; and
at least one pigment:,
wherein the layer composite comprises:
a heat-sensitive recording layer which is disposed between the carrier layer and the coating composition and which comprises a dye precursor and a color developer, and the color developer on exposure to heat is able to induce color formation in the dye precursor,
wherein the heat-sensitive recording layer comprises an acetoacetyl-modified polyvinyl alcohol and
wherein at least one pigment in the coating composition comprises two pigments, which are kaolin, in a mass fraction of 0.3 to 0.4 and precipitated silica, in a mass fraction of 0.02 to 0.04, which has a mean particle size in the range from 6 to 10 μm, determined by particle size analysis by a laser diffraction method.