Process for coextruding a tacky amorphous propylene copolymer composition with a low viscosity polyolefin and article prepared thereby
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United States of America Patent
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Jun 19, 2007
Grant Date -
N/A
app pub date -
Sep 23, 1997
filing date -
May 8, 1995
priority date (Note) -
Expired
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Abstract
Disclosed is a process for producing non-blocking slats of normally tacky amorphous propylene copolymers. The process entails coextruding the normally tacky amorphous propylene copolymer with a low viscosity polyolefin such as a polyethylene wax forming a core of amorphous propylene copolymer covered with a sheath of polyethylene wax. The coextruded article is cooled, cut (while exposing less than 40 percent of the core) and then coated with a non-tacky powder; thereby, forming non-blocking slats. Disclosed is also a novel amorphous propylene copolymer composition containing no more than 90 weight percent propylene and up to 70 weight percent of an alpha olefin comonomer having a needle penetration greater than 70 to less than 100 dmm at 23.degree. C. and a Brookfield Thermosel Viscosity below 1000 cP at 190.degree. C.
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- EASTMAN CHEMICAL COMPANY
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Somers, Marc Stacey | Longview, TX | 31 | 174 |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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