Coextruding tacky amorphous propylene copolymer composition

Details Coextruding tacky amorphous propylene copolymer composition Coextruding tacky amorphous propylene copolymer composition

1996-08-05

1998-03-31

Dixon, Merrick

Stock material or miscellaneous articles

Structurally defined web or sheet

Weight per unit area specified

428220, 524 68, 524 70, 524449, 524490, 525240, 525211, 525528, B32B 702

Patent

active

057336458

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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