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US 5,470,663 AGranted
Meltblowing of ethylene and fluorinated ethylene copolymers
AssigneeExxon Chemical Patents Inc.
InventorsLarry C. Wadsworth, Ahamad Y. Khan
Life of this patent
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Abstract
High MI, high MP ethylene-fluorinated ethylene copolymers (preferably ECTFE) are meltblown through relatively large orifices. The web produced by the process is characterized by low fiber size and high strength.
Claims6
The meltblown web comprising a copolymer of ethylene and a fluorocarbon having the following properties:
- a) an average fiber size of less than 3.2 um;
- b) an MD breaking load of greater than 400 g/in;
- and
- c) a CD breaking load of greater than 1000 g/in;
- wherein the copolymer is ethylene-chlorotrifluoroethylene (ECTFE);
- wherein said ECTFE has an ethylene content in the range of from about 30 to about 70 weight percent, a melting point of 240.degree. C., a melt index in the range of from about 100 to about 1500 dg/10 min, a molecular weight in the range of from about 80,000 to about 120,000, and a T.sub.g about 80.degree. C.
3 more elements
A meltblown web comprising a copolymer of ethylene and a fluorocarbon, wherein
- a) said meltblown web has:
- i) a fiber diameter average in the range of from about 1.5 to about 3.2 .mu.m;
- ii) a packing factor of 0.1 to 0.15, a MD break load greater than about 450 g/in;
- iii) a MD break elongation in the range of from about 3 to about 7%;
- v) a CD break load of at least 1500 g/in;
- vi) a CD break elongation in the range of from about 80 to about 110 %;
- and
- b) said ethylene-fluorocarbon copolymer has:
- i) an ethylene content in the range of from about 40 to about 60 weight percent;
- ii) a melting point of about 240.degree. C.;
- iii) a melt index in the range of from about 300 to about 1000 g/10min;
- iv) a molecular weight in the range of from about 80,000 to about 120,000;
- and
- v) T.sub.g of about 80.degree. C.
11 more elements
A meltblown web comprising a copolymer of ethylene and a fluorocarbon, wherein
- a) said meltblown web has:
- i) fiber diameter in the range of from about 2.0 to about 3.0 .mu.m;
- ii) a packing factor in the range of from about 0.11 to about 0.14;
- iii) a MD break load greater than about 500 g/in;
- iv) a MD break elongation about 4%;
- v) a CD break load greater than about 2000 g/in;
- and
- vi) a CD break elongation in the range of from about 90 to about 105 percent;
- and
- b) said ethylene copolymer has:
- i) an ethylene monomer content about 50 weight percent;
- ii) a melting point about 240.degree. C.;
- iii) a melt index in the range of from about 400 to 800 g/10 min;
- v) a MW about 100,000;
- and
- vi) a T.sub.g about 80.degree. C.
13 more elements
Dependencies are inferred from the claim text.