Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-08-29
1998-08-25
Nagumo, Mark
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 63, 525 64, 525 69, 525221, 525207, 525208, C08G 6702
Patent
active
057984131
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of Invention
This invention relates to polyolefin compositions and more particularly to such compositions which are flexible and polar, and to shaped articles made from them.
2. Background Discussion
Polyvinyl chloride (PVC) sheets have been on the market for many years and have been the standard liner material in the housing industry. PVC sheets are characterized by being flexible over a variable temperature range, heat-sealable, and oil-resistant. However, with the trend toward a chlorine-free environment, there is a need for a PVC sheeting alternative. Ethylene/propylene/diene monomer (EPDM) rubbers are alternatives, but these are difficult to seal. Thus, there is a need for PVC-free sheets which are thermoplastic and heat-sealable, halogen-free and flexible.
SUMMARY OF THE INVENTION
According to the present invention there is provided a flexible, nonhalogen-containing polymer composition which comprises a blend of: containing less than 20% by weight of a copolymerized polar monomer, and containing 0.01-10% by weight of functional groups selected from the group consisting of an epoxy, a carboxylic acid or a derivative thereof, an amino and a hydroxyl; and of: unsaturated organic compound; and (c) is 100%; functional groups selected from the group consisting of an epoxy, a carboxylic acid or a derivative thereof, an amino and a hydroxyl; whereby then the polar ethylene copolymer (3) is functionalized with a carboxylic acid or a derivative thereof or with an amino or hydroxyl group; compatibilizing polymer (2), then the polar ethylene copolymer (3) is functionalized with an epoxy, an amino or a hydroxyl group; and polymer (2), then the polar ethylene copolymer (3) is functionalized with an epoxy group or with a carboxylic acid or a derivative thereof.
Also provided is a shaped article such as a sheet or film made from the aforesaid composition.
DETAILED DESCRIPTION OF THE INVENTION
The invention relates to flexible, nonhalogen-containing thermoplastic polymer blends which are useful in sheet form as liners for roofing, etc. or for making folders, and in film form as packaging films. These blends generally are formed by combining a non-polar thermoplastic polyolefin and a soft, polar thermoplastic ethylene copolymer. Reactive compatibilizing polymers are used in order to affect the blend and to give good properties to the resulting shaped article. This is accomplished by reaction between functional groups of the compatibilizing polymer and functional groups of the polar ethylene copolymer. Such polymer blends can be formed into sheets, films, and other shaped articles which have many properties comparable to polyvinyl chloride (PVC), but with better elongation and with no chlorine.
The term "non-polar thermoplastic polyolefin" (component (1)) means any polyolefin polymer which is thermoplastic but which excludes polar ethylene copolymers as defined herein. The blends of the invention contain 50-98% of a polyolefin, preferably 60-90% by weight. In general, these polyolefins will have a melt flow index (MFI) in the range of 0.01-100 g/10 min., preferably less than 5 g/10 min. as determined by ASTM D-1238 (measured at 2,16 kg and 190.degree. C. or 230.degree. C. depending on the polyolefin used) and are well-known in the art. Useful and preferred polyolefins are high density polyethylene (HDPE) and polypropylene. Other polyolefin homopolymers and copolymers of ethylene can be utilized in the practice of this invention. Such other polyolefins include low density polyethylene (LDPE), very low density polyethylene (VLDPE), linear low density polyethylene (LLDPE) and polybutylene (PB). However, these other polyolefins can be blended with other polyolefins such as polypropylene ("PP") or high density polyethylene ("HDPE"). As used herein the term "polypropylene" includes homopolymers of propylene as well as copolymers of polypropylene which can contain about 1 to about 20 weight percent ethylene or an alpha olefin comonomer of 4 to 16 carbon atoms. The polypropylene can
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Hausmann Karlheinz
Spelthann Heinz H.
E. I. Du Pont de Nemours and Company
Evans Craig H.
Nagumo Mark
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