W.r. Grace & Co. -conn.

Braskem America, Inc.

W. R. Grace Co.-conn.

Matthew J Fedec

Jan Willem Van Egmond

Jeffrey Dale Goad

Li-Min Tau

John Kalevi Kaarto

Ping P Cai

Linfeng Chen

Debra R Wilson

Chai-Jing Chou

Peter S Martin

Peter Simon Dias

Jason C Brodil

Amaia Montoya-goni

Robert C Brady, Iii

Manu Rego

Li-Min Tua

Jeffrey D Goad

Propylene and alpha olefin random copolymers are disclosed that have excellent flow characteristics. For instance, the copolymers can be formulated so as to have a melt flow rate of greater than about 45 g/10 min. While still retaining the above flow characteristics, the copolymer can also be formulated to have greater stiffness, low xylene soluble content, and excellent transparency characteristics especially when combined with one or more clarifying agents.

Propylene-ethylene random copolymers with low XS/ET ratio and high MFR

Propylene-ethylene copolymer compositions and production methods are provided. The copolymer compositions can be particularly advantageous for use in hot fill packaging of foodstuffs. The propylene-ethylene copolymers can be produced using a Ziegler-Natta catalyst and an alkoxysilane electron donor. The compositions can have propylene as a primary monomer with an ethylene content ranging from 2.0 to 6.0 percent by weight with a xylene soluble content of less than 7.0 percent by weight.

Propylene-ethylene copolymer compositions suitable for hot fill packaging of foodstuffs

The present invention relates to an improvement for gas-phase olefin polymerization process having relatively high bed bulk density. The improvement involves the use of mixed external electron donors when polymerizing propylene in a gas-phase reactor having a polymer bed with a bulk density greater than 128 kg/m, optionally with one or more comonomers, wherein the mixed electron donor system comprises at least a first external electron donor and a second external electron donor, and wherein the first external electron donor is a carboxylate compound.

Process for gas-phase polymerization having high bed bulk density

A gas-phase process for making a propylene-based polymer in a fluidized-bed reactor, the reactor containing a fluidized bed including polymer product particles and a catalyst, the process having a set of quantitative criteria for maximum monomer partial pressure, maximum reactor temperature, and comonomer content(s) in the propylene-based polymer. The propylene-based polymer may be EBPT or BPRCP. The catalyst may include a catalyst/donor system comprising (1) a supported Ziegler-Natta pro-catalyst, (2) a co-catalyst, and (3) a mixed external electron donor system including (a) an activity limiting agent including at least one carboxylate ester functional group, and (b) a selectivity control agent.

Producing high comonomer content propylene-based polymers

Propylene impact copolymers (ICPs) are provided which comprise: (a) a matrix phase which comprises from 60 to 95 weight % of a polypropylene polymer containing from 0 to 6 mole % of units derived from one or more alpha-olefins other than propylene, and (b) a dispersed phase which comprises from 5 to 40 weight % of a copolymer derived from a first comonomer which can be either propylene or ethylene together with a second alpha-olefin comonomer. The ICP is further characterized by having a beta/alpha ratio less than or equal to 1.1. The ICPs of the present invention are particularly well suited for applications requiring clear, tough polymers such as thin walled injection molded articles for frozen food packaging applications.

Propylene impact copolymers having good optical properties

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Lake Jackson, TX, United States of America

Matthew J Fedec