Decorative sheet
AssigneeToppan Inc.
InventorsToru Okubo, Daisuke Murata
Life of this patent
Estimating the term…
Abstract
Decorative sheets having improved or even excellent adhesiveness and heat and moisture resistance. A decorative sheet includes at least a substrate layer, an adhesive layer, and a transparent resin layer, which are laminated in this order. The adhesive layer contains a polyester resin and a bisphenol A epoxy resin. The polyester resin contains, as components, phthalic acid, a linear dicarboxylic acid, and an alkylenediol. The polyester resin and the bisphenol A epoxy resin are contained in the adhesive layer in a mass ratio (polyester resin/bisphenol A epoxy resin) of 50/50 to 90/10.
Claims13
A decorative sheet, comprising:
- a substrate layer;
- an adhesive layer;
- a transparent resin layer, and
- a surface protective layer laminated on the transparent resin layer,
- the substrate layer, the adhesive layer, and the transparent resin layer being laminated in this order, wherein
- the adhesive layer consists of a polyester resin and a bisphenol A epoxy resin in a mass ratio between the polyester resin and the bisphenol A epoxy of 60/40 to 80/20,
- the polyester resin is synthesized using (a) an isophthalic acid (IP) and an adipic acid (AD) as dicarboxylic acids and (b) an ethylene glycol, a hexanediol and optionally a neopentyl glycol as diols, wherein a mass ratio between the IP and the AD is 65/35 to 90/10,
- the transparent resin layer does not comprise polypropylene,
- the surface protective layer does not comprise a fluorine-based resin material.
A decorative sheet, comprising:
- a substrate layer;
- a pattern layer;
- an adhesive layer;
- a transparent resin layer, and
- a surface protective layer laminated on the transparent resin layer,
- the substrate layer, the pattern layer, the adhesive layer, and the transparent resin layer being laminated in this order, wherein
- the adhesive layer consists of a polyester resin and a bisphenol A epoxy resin in a mass ratio between the polyester resin and the bisphenol A epoxy of 60/40 to 80/20,
- the polyester resin is synthesized using (a) an isophthalic acid (IP) and an adipic acid (AD) as dicarboxylic acids and (b) an ethylene glycol, a hexanediol and optionally a neopentyl glycol as diols, wherein a mass ratio between the IP and the AD is 65/35 to 90/10,
- the surface protective layer does not comprise a fluorine-based resin material,
- the pattern layer comprises a binder resin that is an urethane resin comprising a caprolactone unit (CL), an alkylene glycol unit (AG), a diisocyanate unit (I), and a neopentyl glycol (NPG), the urethane resin satisfies the following expressions:
- 3<(X+Y+N)/Z<50 (expression 1)
- 0.1<X/Y<10 (expression 2)
- N/(X+Y+X+N)<0.2 (expression 3),
- wherein X is a content of the caprolactone unit, Y is a content of the alkylene glycol unit, Z is a content of the diisocyanate unit and N is a content of the neopentyl glycol unit.
Dependencies are inferred from the claim text.