Method of controlling the molecular weight of polypropylene

Details Method of controlling the molecular weight of polypropylene Method of controlling the molecular weight of polypropylene

1988-10-17

1992-03-24

Teskin, Fred

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

Synthetic resins

Effecting a change in a polymerization process in response...

526 59, 526902, 526905, C08F 202, C08F 1006

Patent

active

050989677

ABSTRACT:
Disclosed herein is a method for controlling the molecular weight of a propylene homo- or co-polymer at a constant level upon subjecting propylene alone or a mixture of propylene and another .alpha.-olefin copolymerizable with propylene as a monomer or monomer mixture to bulk polymerization in the presence of hydrogen as a molecular weight modifier in a reaction tank equipped with a reflux condenser. According to the present invention, it is possible to prepare continuously a propylene homo- or copolymer, the molecular weight of which is controlled at a desired level, by measuring moment by moment the quantity of heat removed from the reaction tank, calculating the amount of the monomer or monomer mixture polymerized in the reaction tank based on the thus-calculated quantity, determining in advance the relationship between molecular weights and the volumes of hydrogen consumption required per unit amounts of corresponding polypropylene homo- or co-polymers, calculating the volume of hydrogen which is to be introduced into the reaction tank so as to obtain polypropylene of a desired molecular weight from the above relationship and the above-calculated polymerized amount, and charging hydrogen into the reaction tank in accordance with the above-calculated volume of hydrogen which varies from time to time.

REFERENCES:
patent: 3146223 (1964-08-01), Cheney
patent: 3758446 (1973-09-01), Coughlin et al.
patent: 4469853 (1984-09-01), Mori
Translation of Jap. Kokai Pat. Pub. No. 57-168904, published Oct. 18, 1982, to Asanuma et al., CA(105):153719c (1986).

Affiliated with

Also associated with

Rating

Method of controlling the molecular weight of polypropylene does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of controlling the molecular weight of polypropylene, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of controlling the molecular weight of polypropylene will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2011017