US 11,732,070 B2
High ethylene random copolymer with non-migrating oligomers
Ranadip Ganguly, Pittsburgh, PA (US)
Assigned to Braskem America, Inc., Philadelphia, PA (US)
Filed by BRASKEM AMERICA, INC., Philadelphia, PA (US)
Filed on Nov. 3, 2021, as Appl. No. 17/518,103.
Application 17/518,103 is a division of application No. 15/921,191, filed on Mar. 14, 2018, granted, now 11,192,968.
Claims priority of provisional application 62/590,906, filed on Nov. 27, 2017.
Claims priority of provisional application 62/481,388, filed on Apr. 4, 2017.
Prior Publication US 2022/0056176 A1, Feb. 24, 2022
Int. Cl. C08F 210/06 (2006.01); B65D 65/38 (2006.01); C08J 5/18 (2006.01)
CPC C08F 210/06 (2013.01) [B65D 65/38 (2013.01); C08J 5/18 (2013.01); C08F 2500/26 (2013.01); C08F 2800/20 (2013.01); C08J 2323/14 (2013.01)] 11 Claims
 
1. A low-haze film, comprising an ethylene/propylene random copolymer composition comprising about 3.5-10 wt % ethylene content and about 90-96.5 wt % propylene content, wherein the percentage haze of the film, measured on a film of 2 mil thickness after 96 hours of annealing at 50° C., satisfies one of the following two criteria:
i) when the value calculated as

OG Complex Work Unit Math
is about 0.002 or less, the percentage haze value is no more than about 3.3%; or
ii) when the value calculated as

OG Complex Work Unit Math
is greater than about 0.002, the percentage haze value falls below the linear curve generated from the following equation:

OG Complex Work Unit Math
where a is 3403.74 and b is 1.27;
wherein C2 is the ethylene weight percent of the total ethylene/propylene random copolymer, Xn,2i is the Regio error of the hexane extract, r1r2 is the Blockiness Index of hexane extract, and mmmm is the Meso-pentad of the hexane extract.