Use of agents to reduce crystallinity in polypropylene for BOPP applications

Patent metadata

Field	Value
Publication number	US-10683408-B2
Application number	US-201715796547-A
Country	US
Kind code	B2
Filing date	Oct 27, 2017
Priority date	Oct 28, 2016
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

The BOPP film includes a polypropylene, an absence of a nucleating agent, and an additive blended with the polypropylene forming a polypropylene/additive blend, wherein the additive is potassium stearate.

First claim

What is claimed is:

1. A process of manufacturing a BOPP film comprising:
blending polypropylene with an additive to form a polypropylene/additive blend without adding a nucleating agent, wherein the additive is potassium stearate;
casting the polypropylene/additive blend to form a sheet, wherein the sheet consists essentially of the propylene/additive blend wherein the level of crystallinity in the sheet during processing is less than if the additive had not been blended with the polypropylene; and
biaxially orienting the sheet to form a thin film.

2. The process of claim 1 , wherein the concentration of potassium stearate in the polypropylene/additive blend is between 100 ppm and 2000 ppm.

3. The process of claim 1 , wherein a speed of crystallization in the process of manufacturing the BOPP film is slower than if the additive had not been blended with the polypropylene.

4. The process of claim 1 wherein the process of manufacturing the BOPP film requires less heat, has a lower induction time, has a higher process speed or a combination thereof than if the additive had not been blended with the polypropylene.

5. The process of claim 1 , wherein a crystallization rate in the thin film during processing is less than if the additive had not been blended with the polypropylene.

6. The process of claim 1 , wherein the haze, gloss 45°, elongation, ultimate tensile, tensile modulus, and WVTR of the thin film are not negatively impacted by the addition of the additive.

7. The process of claim 1 , wherein at any point during the steps of casting the polypropylene/additive blend to form a sheet and biaxially orienting the sheet to form a thin film the crystallinity will be lower than if the additive had not been blended with the polypropylene.

Assignees

• Fina Technology

Inventors

• Leland Mark
• Lawton Jill
• Sun Likuo
• Cortes Leonardo Rodriguez
• Vazquez Enrique

Classifications

• C08K2201/019

  the composition being defined by the absence of a certain additive · CPC title

• C08L23/12

  Polypropene · CPC title

• C08J5/18 Primary

  Manufacture of films or sheets · CPC title

• C08J2323/12

  Polypropene · CPC title

• C08K5/098 Primary

  Metal salts of carboxylic acids · CPC title