US 11,890,845 B2
Decorative sheet
Ryosuke Takahashi, Tokyo (JP); Mamiko Sano, Tokyo (JP); and Hayato Funaki, Tokyo (JP)
Assigned to TOPPAN PRINTING CO., LTD., Tokyo (JP)
Filed by Toppan Inc., Tokyo (JP)
Filed on May 25, 2022, as Appl. No. 17/824,493.
Application 17/824,493 is a division of application No. 16/939,908, filed on Jul. 27, 2020.
Application 16/939,908 is a continuation of application No. PCT/JP2019/017429, filed on Apr. 24, 2019.
Claims priority of application No. 2018-084414 (JP), filed on Apr. 25, 2018; application No. 2018-191838 (JP), filed on Oct. 10, 2018; application No. 2018-191839 (JP), filed on Oct. 10, 2018; and application No. 2019-070717 (JP), filed on Apr. 2, 2019.
Prior Publication US 2022/0281205 A1, Sep. 8, 2022
Int. Cl. B32B 3/30 (2006.01); B32B 7/022 (2019.01); B32B 27/08 (2006.01); B32B 27/30 (2006.01)
CPC B32B 3/30 (2013.01) [B32B 7/022 (2019.01); B32B 27/08 (2013.01); B32B 27/30 (2013.01); B32B 2270/00 (2013.01); B32B 2307/31 (2013.01); B32B 2307/4023 (2013.01); B32B 2307/412 (2013.01); B32B 2307/718 (2013.01); B32B 2307/732 (2013.01); B32B 2451/00 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A decorative sheet, comprising:
a substrate layer;
a thermoplastic resin layer that is provided on a side of a front surface of the substrate layer;
a surface protection layer that is provided on a front surface of the thermoplastic resin layer;
a pattern layer made of an acrylic ink; and
an adhesive layer made of acrylic-vinyl chloride acetate, the pattern layer and the adhesive layer being between the thermoplastic layer and the substrate layer;
wherein the substrate layer is an ABS resin layer;
the substrate layer is an outermost layer of the decorative sheet;
the thermoplastic resin layer is a PMMA layer or a polypropylene layer;
the surface protection layer is made of an acrylic urethane-based resin;
a thickness of the substrate layer is 375 μm;
a thickness of the thermoplastic resin layer is 125 μm;
and wherein
when a test piece with a width of 8 mm is prepared from the decorative sheet and a storage modulus is measured for the prepared test piece with an initial chuck distance of 10.77 mm, at a start temperature of 30° C., an end temperature of 150° C., an environmental temperature that is changed at a temperature increase rate of 5° C./min, and a measurement frequency of 1.0 Hz, wherein the decorative sheet has a first storage modulus when the environmental temperature is 30° C., a second storage modulus when the decorative sheet changes from a glassy region to a transition region, and a third storage modulus when the decorative sheet changes from a transition region to a rubbery flat region, wherein a ratio of a difference between the second storage modulus and the third storage modulus relative to a difference between the first storage modulus when the environmental temperature is 30° C. and the second storage modulus is 2.0 or less.