Decorative resin composition and multilayered directly blow-formed bottle having a metallic layer formed by using the same composition

Patent metadata

Field	Value
Publication number	US-10173402-B2
Application number	US-201615749687-A
Country	US
Kind code	B2
Filing date	Aug 25, 2016
Priority date	Aug 31, 2015
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

A decorative resin composition containing a metal pigment having an average thickness of not more than 600 nm dispersed in a blend of a low-density polyethylene (LDPE) having a density of not less than 0.910 g/cm3 but less than 0.930 g/cm3 and a linear low-density polyethylene (LLDPE) having a density of 0.910 to 0.925 g/cm3.

First claim

The invention claimed is:

1. A decorative resin composition containing a metal pigment having an average thickness of not more than 600 nm dispersed in a blend of a low-density polyethylene (LDPE) having a density of not less than 0.910 g/cm 3 but less than 0.930 g/cm 3 and a linear low-density polyethylene (LLDPE) having a density of 0.910 to 0.925 g/cm 3 .

2. The decorative resin composition according to claim 1 , wherein said low-density polyethylene (LDPE) and said linear low-density polyethylene (LLDPE) are blended together at a mass ratio of LDPE:LLDPE=1:9 to 9:1.

3. The decorative resin composition according to claim 1 , wherein both said low-density polyethylene (LDPE) and said linear low-density polyethylene (LLDPE) have melt flow rate (190° C.) of not more than 1.0 g/10 min.

4. The decorative resin composition according to claim 1 , wherein said metal pigment is dispersed in an amount of 0.1 to 30.0 parts by mass per a total amount of 100 parts by mass of said low-density polyethylene (LDPE) and said linear low-density polyethylene (LLDPE).

5. The decorative resin composition according to claim 1 , wherein said metal pigment is an aluminum pigment.

6. A multilayered directly blow-formed bottle in which a metallic layer formed by using the decorative resin composition of claim 1 is located at a position where it can be seen from the outer surface side.

7. The multilayered directly blow-formed bottle according to claim 6 , wherein when light is incident on the outer surface of a bottle wall at an angle of 45 degrees by using a multi-angle colorimeter, a lightness L* 15 (L*a*b* color system) due to light reflected in a direction of 15 degrees relative to regularly reflected light is not less than 150.

8. The multilayered directly blow-formed bottle according to claim 6 , wherein said metallic layer is formed on a lower side of an outer surface layer or an outer surface transparent resin layer.

9. The multilayered directly blow-formed bottle according to claim 6 , wherein when shear viscosities (Pa·s) of a resin that is forming a layer neighboring the metallic layer on an inner side thereof are denoted by V 6 and V 30 , shear viscosities (Pa·s) being values at shear rate 6 s −1 and 30 s −1 measured at a temperature of 210° C., then the blend used for forming the metallic layer satisfies following viscosity condition formulas (1) and (2):
η 6 ≥V 6 −2000  (1)

η 30 ≥V 30 −2000  (2)

wherein η 6 and η 30 are, respectively, shear viscosities (Pa·s) at shear rate 6 s −1 and 30 s −1 measured at a temperature of 210° C.

10. A method of producing the multilayered directly blow-formed bottle by preparing the decorative resin composition of claim 1 by a melt-mixing method in an extruder, co-extruding a resin composition prepared in the extruder into a preform of a shape of a pipe in which a layer of said composition is formed at a position where it can be seen from an outer surface side, and blowing a fluid into said preform that is closed at one end thereof so that said preform is shaped into a bottle.

Assignees

• Toyo Seikan Kaisha Ltd
• Toyo Aluminium Kk

Inventors

• Katou Yuuichirou
• Ozawa Satomi
• Anzai Yusuke
• Fudaba Tetsuya
• Ikeya Akihiko

Classifications

• C08L23/06

  Polyethylene · CPC title

• B32B27/00

  Layered products comprising {a layer of} synthetic resin {(fibrous or filamentary layer made of a synthetic resin B32B5/02; particulate layer made of a synthetic resin B32B5/16; foamed layer made of a synthetic resin B32B5/18)} · CPC title

• C08K3/013

  Fillers, pigments or reinforcing additives · CPC title

• C08L2207/066

  LDPE (radical process) · CPC title

• B65D1/00

  Rigid or semi-rigid containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material or by deep-drawing operations performed on sheet material (with curved or partially-curved cross-section made by winding or bending paper B65D3/00; with polygonal cross-section formed by folding B65D5/00; specially constructed to be opened by cutting, piercing or tearing of wall portions B65D17/00; rigid pallets with side walls B65D19/02) · CPC title