Batch inclusion packages

• US 5,580,914 A
• Filed: 06/07/1995
• Issued: 12/03/1996
• Est. Priority Date: 09/08/1993
• Status: Expired due to Fees

• Current Assignee: The Dow Chemical Company (Dow, Inc.)
• Original Assignee: The Dow Chemical Company (Dow, Inc.)
• Inventors: Falla, Daniel J., Walker, Debbie-Lee
• Primary Examiner(s): WU, DAVID WEI HSIUNG
• Application Number:
  US08/479,984
• Time in Patent Office: 545 Days
• Field of Search: 524/257, 524/418, 524/420, 524/425, 524/432, 524/445, 524/348.1, 526/348.2, 526/348.3, 526/348.4, 526/348.5, 526/348.6
• US Class Current: 524/257
• CPC Class Codes: C08J 2323/08 Copolymers of ethene C08J2323/16 takes precedence
• CPC Class Codes: C08J 3/223 Packed additives
• CPC Class Codes: C08J 5/18 Manufacture of films or sheets
• CPC Class Codes: Y10T 428/31913 Monoolefin polymer
• CPC Class Codes: Y10T 428/3192 Next to vinyl or vinylidene chloride polymer
• CPC Class Codes: Y10T 428/31938 Polymer of monoethylenically unsaturated hydrocarbon

Abstract

Batch inclusion packages made from films and film structures are disclosed. The films and film structures have at least one layer of at least one substantially linear ethylene/α-olefin polymer. The batch inclusion packages are useful in wrapping or containing various materials, such as carbon black, titanium dioxide, and rubber compounding ingredients.

Claims

1. A method of incorporating an ingredient into a finished article in a manufacturing process comprising melting a batch inclusion package to form the finished article, wherein said package comprises

(A) an ingredient used to make an article packaged in

(B) a protective film comprising at least one layer of at least one substantially linear ethylene/C₃ -C₂₀ α

-olefin polymer, wherein the protective film (B) becomes part of the final article comprising the ingredient and wherein the substantially linear ethylene/α

-olefin polymer is characterized as having;

(a) a melt flow ratio, I₁₀ /I₂, ≧

5.63,

(b) a molecular weight distribution, M_w /M_n, defined by the equation;

M_w /M_n ≦

(I₁₀ /I₂)-4.63, and

c) a critical shear rate at onset of surface melt fracture of at least 50 percent greater than the critical shear rate at the onset of surface melt fracture of a linear ethylene/α

-olefin polymer having about the same I₂ and M_w /M_n.

2. The method of claim 1 wherein the molecular weight distribution, Mw/Mn, of the substantially linear ethylene/C₃ -C₂₀ α

-olefin polymer is from about 1.5 to about 2.5.

3. The method of claims 1 or 2 wherein said substantially linear ethylene/α

-olefin polymer has melting range of about 25°

C. as indicated by the difference between said polymer'"'"'s melting point and said polymer'"'"'s softening point.

4. The method of claims 1 or 2 wherein said substantially linear ethylene/α

-olefin polymer has melting range of about 9°

C. as indicated by the difference between said polymer'"'"'s melting point and said polymer'"'"'s softening point.

5. The method of claims 1 or 2 wherein said substantially linear ethylene/α

-olefin polymer has melting point from about 50°

C. to about 115°

C.

6. The method of claims 1 or 2 wherein said ingredient is a free flowing ingredient selected from the group consisting of clay, silicates, calcium carbonate, cadmium diethyldithiocarbanate, tetramethylthiuram disulfide, benzothiazyl disulfide, substituted thio esters and amine type antioxidants, aniline antiozonant derivatives, curatives, ultraviolet agents, color pigments, reinforcing pigments, processing aids and rubber processing oils.

7. The method of claims 1 or 2 wherein said protective film is a cast film and has a Dart impact of greater than 1030 grams.