Chemically degradable polyolefin films

• US 5,565,503 A
• Filed: 01/18/1995
• Issued: 10/15/1996
• Est. Priority Date: 08/24/1992
• Status: Expired due to Term

• Current Assignee: EPI Environmental Technologies (Nevada) Inc.
• Original Assignee: EPI Environmental Products Inc.
• Inventors: Gho, Joseph G., Garcia, Rodrigo A.
• Primary Examiner(s): Michl, Paul R.
• Assistant Examiner(s): Asinovsky, Olga
• Application Number:
  US08/374,114
• Time in Patent Office: 636 Days
• Field of Search: 523/124, 523/125, 523/128, 524/425, 264/564, 264/566
• US Class Current: 523/124
• CPC Class Codes: C08J 2323/02 not modified by chemical after treatment
• CPC Class Codes: C08J 2323/04 Homopolymers or copolymers of ethene
• CPC Class Codes: C08J 2323/10 Homopolymers or copolymers of propene
• CPC Class Codes: C08J 5/18 Manufacture of films or sheets
• CPC Class Codes: C08K 3/013 Fillers, pigments or reinforcing additives
• CPC Class Codes: C08K 3/26 Carbonates; Bicarbonates
• CPC Class Codes: C08K 5/098 Metal salts of carboxylic acids
• CPC Class Codes: C08L 23/02 not modified by chemical after-treatment
• CPC Class Codes: F02B 1/04 with fuel-air mixture admission into cylinder

Abstract

The present invention is directed to melt blown polyolefin film which is produced cheaply by melt blowing polyolefin resins which contain 25 to 60 wt % fillers selected from the fillers including an inorganic carbonate, synthetic carbonates, nepheline syenite, talc, magnesium hydroxide, aluminum trihydrate, diatomaceous earth, mica, natural or synthetic silicas and calcined clays or mixtures thereof, having a particle size less than 150 mesh.

A further aspect of the present invention is directed to polyolefin resins, especially polyethylene, which are chemically degradable by the incorporation of the combination of the above group of fillers and a metal carboxylate. The metal carboxylates of the present invention are inclusive of a large number of metals, such as cerium, cobalt, iron, and magnesium.

Claims

1. A polyolefin film produced from the process for melt blowing a degradable polyolefin resin into a film comprising:

extruding a polyethylene composition consisting essentially of 50 to 92wt % polyethylene resin;

47 to 7.5 wt % a filler selected from the group consisting of inorganic carbonates, synthetic carbonates, talc, magnesium hydroxide, mica, natural silicas, synthetic silicas and calcined clays, having a particle size less than 150 mesh; and

3 to 0.5 wt % metal carboxylate through a melt blowing die;

blowing a bubble of said composition; and

collapsing said bubble into a film.

2. A polyolefin film produced from the process according to claim 1 wherein said polyethylene composition consists essentially of:

at least 50 wt % and up to 92 wt % polyethylene resin;

47 to 7.5 wt % filler; and

3 to 0.5 wt % metal carboxylate.