Process for coextruding a tacky amorphous propylene copolymer co

Details Process for coextruding a tacky amorphous propylene copolymer co Process for coextruding a tacky amorphous propylene copolymer co

1996-08-05

1999-08-24

Thibodeau, Paul

Stock material or miscellaneous articles

Sheet including cover or casing

428 76, 428143, 428220, 428361, 428372, 428516, C09J12314

Patent

active

059423048

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.

REFERENCES:
patent: 3900694 (1975-08-01), Jurrens
patent: 4748796 (1988-06-01), Viel
patent: 4929509 (1990-05-01), Godfrey
patent: 5002989 (1991-03-01), Naumovitz et al.
patent: 5041251 (1991-08-01), McCoskey et al.
patent: 5109892 (1992-05-01), Somers
patent: 5160686 (1992-11-01), Thaler et al.
patent: 5201420 (1993-04-01), Thaler et al.
patent: 5292468 (1994-03-01), Colombani
patent: 5307608 (1994-05-01), Muir et al.
patent: 5401455 (1995-03-01), Hatfield et al.
patent: 5412029 (1995-05-01), Elm et al.
patent: 5482982 (1996-01-01), Lakshmanan et al.
Kaufman et al. "Waxes", The Encyclopedia of Polymer Science and Engineering, vol. 17, pp. 790-795, 1985.

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