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BLEND COMPOSITIONS COMPRISING POLYOLEFINS, AROMATIC POLYETHERS, AND SUBSTANTIALLY RANDOM ETHYLENE/VINYL AROMATIC MONOMER INTERPOLYMERS

IP.com Disclosure Number: IPCOM000016463D
Publication Date: 2003-Jun-23
Document File: 6 page(s) / 2M

Publishing Venue

The IP.com Prior Art Database

Abstract

Blend compositions comprising (a) substantially random interpolymers of alpha-olefin/vinyl aromatic monomers and (b) aromatic polyethers are disclosed in United States Patent Number 6201067. The specific combination of aromatic polyethers and polyolefins compatibilized by one or more substantially random interpolymers of alpha-olefin/vinyl aromatic monomers, and the potential utility of these blends in a range of applications are the subjects of this disclosure.

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BLEND COMPOSITIONS COMPRISING POLYOLEFINS, AROMATIC POLYETHERS, AND SUBSTANTIALLY RANDOM ETHYLENE/VINYL AROMATIC MONOMER INTERPOLYMERS

Blend compositions comprising (a) substantially random interpolymers of alpha-olefin/vinyl aromatic monomers and (b) aromatic polyethers are disclosed in United States Patent Number 6201067. The specific combination of aromatic polyethers and polyolefins compatibilized by one or more substantially random interpolymers of alpha-olefin/vinyl aromatic monomers, and the potential utility of these blends in a range of applications are the subjects of this disclosure.

The use of random copolymers as blend compatibilizers has received some attention in the literature. As stated by Dadmun (Macromolecules, volume 33, pages 9122 to 9125, 2000), there are contradictory experimental results regarding the efficiency of random copolymers to effectively compatibilize an immiscible polymer blend. Molecular weight and monomer chain sequence distributions are two factors identified as being important for random copolymers to act as blend compatibilizers. Substantially random interpolymers of a-olefin/vinyl aromatic monomers have certain desirable attributes when used as compatibilizers for blends of olefinic polymers and vinyl aromatic polymers such as polystyrene (Park et al.; United States patent number 5,460,818), for example by providing improved toughness of these blend systems.

The terms copolymer and interpolymer are used interchangeably in this disclosure. The term "substantially random" includes copolymers and interpolymers such as described in United States patent number 5,703,187, United States patent number 5,872,201, copolymers of ethylene and styrene produced by bridged metallocene catalysts such as those described in United States patent number 5,652,315 and also copolymers of ethylene and styrene as described by Arai, Toshiaki and Suzuki (Polymer Preprints, Am. Chem. Soc., Div. Polym. Chem.) Volume 38, pages 349, 350 [1997]).

The polymer blend compositions of interest comprise:

(A)  1 to 97 weight percent of one or more aromatic polyethers, especially poly(2,6-dimethyl-1,4-phenylene ether) (PPE).

(B)  1 to 97 weight percent of one or more polyolefins. Polyolefins include ethylene homopolymers and copolymers of ethylene with C3-C20 a-olefins. Commercially available products include ultralow density polyethylene (ULDPE) low density polyethylene (LDPE), linear low density polyethylene (LLDPE) medium density polyethylene (MDPE), high density polyethylene (HDPE), polyolefin plastomers, such as those marketed by The Dow Chemical Company under the AFFINITYTM tradename and polyethylene elastomers, such as those marketed under the ENGAGETM tradename by Du Pont Dow Elastomers Plc.

Polyolefins further include propylene homopolymers, propylene-ethylene copolymers, polypropylene impact copolymers (e.g., those wherein a secondary in-reactor copolymerization step reacting ethylene with the propylene is employed), and propylene/C...