Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1995-03-21
1997-03-11
Jagannathan, Vasu S.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525185, 525539, 524504, C08L 5106
Patent
active
056102348
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, non-halogen-containing polymer composition which comprises a blend of: unsaturated organic compound; and or derivative thereof grafted olefin polymer.
DETAILED DESCRIPTION OF THE INVENTION
The invention relates to flexible, non-halogen 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. A compatibilizing agent is required in order to affect the blend. 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" means any polyolefin polymer which is thermoplastic but which excludes polar ethylene copolymers as defined herein. 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). Useful 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 (VLPE), 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 be highly crystalline isotactic or syndiotactic polypropylene. The copolymer can be either a random or block copolymer. The density of the PP or copolymer can be from about 0.88 to about 0.92 g/cc; generally, from about 0.89 to about 0.91 g/cc.
High density polyethylene useful as a polyolefin resin of this invention, has a density of about 0.941 to about 0.965 g/cc. High density polyethylene is an established product of commerce and its manufacture and general properties are well known to the art. Typically, HDPE has a relatively broad molecular weight distribution, characterized by the ratio of weight average molecular weight to number average molecular weight of from about 20 to about 40.
Low density polyethylene (LDPE) as used herein means both low and medium density polyethylene having densities of about 0.910 to about 0.940 g/cc. The terms include linear polyethylene as well as copolymers of ethylene which are thermoplastic resins, but non-polar.
Very low density polyethylene (VLDPE) is used herein to mean polyethylene having a density below about 0.910 g/cc and includes linear polyethylene as well as copolymers of ethylene which are thermoplastic resins, but non-polar.
Linear low density polyethylene
REFERENCES:
patent: 4868242 (1989-09-01), George
patent: 5089556 (1992-02-01), Tabor
patent: 5395881 (1995-03-01), Spelthann
E. I. Du Pont de Nemours and Company
Jagannathan Vasu S.
LandOfFree
Flexible polar thermoplastic polyolefin compositions does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flexible polar thermoplastic polyolefin compositions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flexible polar thermoplastic polyolefin compositions will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-444290