US 11,905,403 B2
Vinyl alcohol based copolymer, method for preparing the same and gas barrier film comprising the same
Moon Seok Chun, Daejeon (KR); and Kyung An Kwon, Daejeon (KR)
Assigned to LG Chem, Ltd., (KR)
Appl. No. 17/049,077
Filed by LG Chem, Ltd., Seoul (KR)
PCT Filed Jan. 21, 2020, PCT No. PCT/KR2020/001017
§ 371(c)(1), (2) Date Oct. 20, 2020,
PCT Pub. No. WO2020/153771, PCT Pub. Date Jul. 30, 2020.
Claims priority of application No. 10-2019-0008233 (KR), filed on Jan. 22, 2019; and application No. 10-2020-0007547 (KR), filed on Jan. 20, 2020.
Prior Publication US 2021/0230417 A1, Jul. 29, 2021
Int. Cl. C08L 29/04 (2006.01); C08F 8/12 (2006.01); C08F 210/02 (2006.01); C08F 216/06 (2006.01); C08F 218/08 (2006.01); C08F 220/42 (2006.01); C08F 8/30 (2006.01); C08F 210/06 (2006.01); C08F 210/08 (2006.01); C08F 210/14 (2006.01); C08K 3/22 (2006.01)
CPC C08L 29/04 (2013.01) [C08F 8/12 (2013.01); C08F 210/02 (2013.01); C08F 210/06 (2013.01); C08F 210/08 (2013.01); C08F 210/14 (2013.01); C08F 216/06 (2013.01); C08F 218/08 (2013.01); C08F 220/42 (2013.01); C08K 3/22 (2013.01); C08F 8/30 (2013.01); C08F 2800/10 (2013.01); C08L 2201/14 (2013.01); C08L 2203/16 (2013.01)] 7 Claims
 
1. A method for preparing a vinyl alcohol-based copolymer, comprising the step of:
performing hydrolysis by a saponification reaction by adding a basic substance to a copolymer of an olefin-vinyl carboxylate-based compound,
wherein the copolymer of an olefin-vinyl carboxylate-based compound has a weight average molecular weight of 100,000 to 350,000 g/mol and a molecular weight distribution of 1.5 to 2.5,
wherein the vinyl alcohol-based copolymer comprises a first repeating unit derived from an olefin, a second repeating unit represented by Chemical Formula 1 containing a hydroxyl group, and a third repeating unit represented by Chemical Formula 2 containing a cyanoalkyloxy group,
wherein the first repeating unit is included in an amount of 10 to 70 mol % with respect to 100 mol % of a total amount of repeating units in the vinyl alcohol-based copolymer, and
wherein the third repeating unit is comprised in an amount of 2 mol % or more and less than 10 mol % with respect to 100 mol % of a total amount of the second repeating unit and the third repeating unit:

OG Complex Work Unit Chemistry

OG Complex Work Unit Chemistry
in Chemical Formula 2, L is C1-10 alkylene,
wherein an unsaturated nitrile-based compound is added when the saponification reaction proceeds at least 95%, and reacted such that a cyanoalkyl substitution ratio according to Equation 1 is 2 mol % or more and less than 10 mol %:
Cyanoalkyl substitution ratio=[(mol % of third repeating unit)/(mol % of second repeating unit+mol % of third repeating unit)]×100  [Equation 1]
in Equation 1, the mol % of second repeating unit and the mol % of third repeating unit are values based on 100 mol % of the total amount of repeating units in the vinyl alcohol-based copolymer.