Blends of polypropylenes

Details Blends of polypropylenes Blends of polypropylenes

1998-11-23

1999-11-16

Lipman, Bernard

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525240, 525241, 525323, 260897, C08L 2312, C08L 2314

Patent

active

059860090

ABSTRACT:
The invention includes a blend composition comprising (a) about 1 to about 15 weight percent of amorphous polypropylene (b) about 99 to about 85 weight percent of crystalline polypropylene, wherein the molecular weight of the amorphous polypropylene is lower than the molecular weight of the crystalline polypropylene; the molecular weight (Mw) of the amorphous polypropylene is higher than about 50,000, preferably 100,000 g/mole; the amorphous polypropylene has a MWD less than about 3; and wherein the percentages are based on total amorphous plus crystalline polypropylene. Preferably, amorphous and crystalline polypropylenes are at least about 90 weight percent propylene units. Preferably, the amorphous polypropylene has a glass transition temperature greater than about -10.degree. C. The invention includes processes for preparing compositions of the invention, including a multistage process. Additionally the invention includes articles, sheets, films, foams and fibers comprising or prepared from compositions of the invention as well as processes for making the things, preferably processes involving stretching a composition of the invention. The processes include a process comprising, extrusion or injection blow molding; extruding, or thermoforming a composition of the invention; as well as a process comprising reacting a composition of the invention with a coupling agent.

REFERENCES:
patent: 4022728 (1977-05-01), Trotter et al.
patent: 4120916 (1978-10-01), Meyer, Jr. et al.
patent: 5414027 (1995-05-01), DeNicola et al.
patent: 5464907 (1995-11-01), Lelenic et al.
patent: 5516848 (1996-05-01), Ganich et al.
patent: 5539056 (1996-07-01), Yang et al.
patent: 5686533 (1997-11-01), Gahleitner et al.
Seymour, R. et.al. "Polymer Chemistry", second edition, Marcel Dekker, INc, pp. 74-75, 1987.
Whelan, T "Polymer Technology Dictionary", Chapman & Hall, first edition, pp. 312, 91, 1994.
Billme yer F., "Textbook of Polymer Chemistry", third edition, John Willey & Sons, pp. 242, 243, 307, 1984.

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