Enhanced tactile responsive and optically translucent film for packaging

Patent metadata

Field	Value
Publication number	US-10087315-B2
Application number	US-201515304386-A
Country	US
Kind code	B2
Filing date	Apr 15, 2015
Priority date	Apr 15, 2014
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

A polymeric composition suitable for blown film applications comprising a) 80 to 99.5 percent by weight of a continuous polymeric phase comprising a polyolefin, and b) 0.5 to 20 percent by weight of polymeric particles having i) an average particle diameter of 0.85 to 20 μm; ii) a refractive index from 1.46 to 1.61; iii) an average particle hardness from 1.2367E+10 N/m 2 to 8.4617E+10 N/m 2 ; and iv) at least 60% polymerized acrylic monomer units, is disclosed. The polymeric composition can be used to form blown film characterized by having a thickness in the range of from 5 to 350 μm, a modulus of elasticity in the range of from 5 to 133 MPa, a melt strength in the range of from 4 to 40 cN, an elongation at break in the range of from 100 to 1000%, a 45 degree gloss in the range of from 7 to 136 and a softness measured by human panel handfeel-ranking methodology, measured by ISO 8587 Sensory analysis that is higher than a film which does not contain the polymeric composition.

First claim

The invention claimed is:

1. A blown film having at least one layer comprising a polymeric composition, the polymeric composition, comprising:
a) 80 to 99.5 percent by weight of a continuous polymeric phase comprising a polyolefin, and
b) 0.5 to 20 percent by weight of polymeric particles having:
i) an average particle diameter of 0.85 to 20 μm;
ii) a refractive index from 1.46 to 1.61;
and
iii) at least 60 mole percent of acrylic monomer units

wherein the blown film is characterized by having a thickness in the range of from 5 to 350 μm, a modulus of elasticity in the range of from 5 to 133 MPa, a melt strength in the range of from 4 to 40 cN, an elongation at break in the range of from 100 to 1000%, a 45 degree gloss in the range of from 7 to 36 and a softness measured by human panel handfeel-ranking methodology, measured by ISO 8587 Sensory analysis that is higher than a film which does not contain the polymeric composition.

2. The polymeric composition in accordance with claim 1 , wherein the polyolefin is selected from the group consisting of polypropylene, polyethylene, polybutylene and copolymers and blends thereof.

3. The polymeric composition in accordance with claim 1 , wherein the polymeric particles have a continuous refractive index gradient.

4. The polymeric composition in accordance with claim 3 , wherein the polymeric particles have a refractive index at the surface from 1.46 to 1.61 and a refractive index at the center from 1.46 to 1.53.

5. The polymeric composition in accordance with claim 1 , wherein the polymeric particles comprise at least 70 mole % of acrylic and styrenic monomer units.

6. A composition comprising the polymeric composition of claim 1 and a pigment selected from the group consisting of titanium dioxide, calcium carbonate, and mixtures thereof.

7. An article comprising the blown film according to claim 1 .

8. The article according to claim 7 , wherein the article is a flexible package selected from the group consisting of a bag, a flowpack, a pillow pouch, and a soft good overwrap.

Assignees

• Dow Global Technologies Llc
• Rohm & Haas

Inventors

• Lafleur Edward E
• Hernandez Claudia
• Nungesser Edwin
• Chen Xuming

Classifications

• C08J2433/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C08J5/18 Primary

  Manufacture of films or sheets · CPC title

• C08K7/16

  Solid spheres · CPC title

• C08J2323/02

  not modified by chemical after treatment · CPC title

• C08L23/02 Primary

  not modified by chemical after-treatment · CPC title