US 2019/0315933 A1Published application

Ethylene-vinyl alcohol copolymer composition pellets, and production method for ethylene-vinyl alcohol copolymer composition pellets

AssigneeMitsubishi Chemical Corporation

InventorsTakuya NAKAJIMA, Nobuyuki YAMAMOTO

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Abstract

Ethylene-vinyl alcohol copolymer composition pellets comprise: an ethylene-vinyl alcohol copolymer; a boron compound; and a predetermined amount of at least one fisheye-suppressing component, wherein pellet surface portions of the ethylene-vinyl alcohol copolymer composition pellets have a boron compound content of not higher than 1.7 ppm on a boron basis based on the weight of the pellets. The ethylene-vinyl alcohol copolymer composition pellets are capable of suppressing occurrence of fisheyes even if being used for formation of a single-layer ethylene-vinyl alcohol copolymer film.

Claims6

Dependent claims

An ethylene-vinyl alcohol copolymer composition pellet comprising:

an ethylene-vinyl alcohol copolymer;
a boron compound;
and
at least one component selected from the group consisting of:
(A) 0.0001 to 0.05 wt. % of a cinnamic acid component based on a weight of the ethylene-vinyl alcohol copolymer composition pellet;
(B) not greater than 500 ppm of an alkali metal based on the weight of the ethylene-vinyl alcohol copolymer composition pellet;
(C) not greater than 0.06 wt. % of a conjugated polyene based on the weight of the ethylene-vinyl alcohol copolymer composition pellet;
(D) 0.001 to 0.15 wt. % of a lubricant based on the weight of the ethylene-vinyl alcohol copolymer composition pellet;
and
(E) not greater than 100 ppm of an alkali earth metal based on the weight of the ethylene-vinyl alcohol copolymer composition pellet,
wherein pellet surface portions of the ethylene-vinyl alcohol copolymer composition pellet have a boron compound content of not higher than 1.7 ppm on a boron basis based on the weight of the ethylene-vinyl alcohol copolymer composition pellet.

8 more elements

A method for producing an ethylene-vinyl alcohol copolymer composition pellet, comprising:

bringing a pellet of an ethylene-vinyl alcohol copolymer into contact with a boron compound to incorporate the boron compound to the ethylene-vinyl alcohol copolymer pellet;
and
rinsing the boron compound-incorporated ethylene-vinyl alcohol copolymer pellet so that pellet surface portions of the ethylene-vinyl alcohol copolymer composition pellet have a boron compound content of not higher than 1.7 ppm on a boron basis based on a weight of the ethylene-vinyl alcohol copolymer composition pellet, and
at least one action selected from the group consisting of:
(A′) bringing the ethylene-vinyl alcohol copolymer pellet into contact with a cinnamic acid component so that the ethylene-vinyl alcohol copolymer composition pellet has a cinnamic acid component content of 0.0001 to 0.05 wt. % based on the weight of the ethylene-vinyl alcohol copolymer composition pellet;
(B′) bringing the ethylene-vinyl alcohol copolymer pellet into contact with an alkali metal so that the ethylene-vinyl alcohol copolymer composition pellet has an alkali metal content of not higher than 500 ppm based on the weight of the ethylene-vinyl alcohol copolymer composition pellet;
(C′) bringing the ethylene-vinyl alcohol copolymer pellet into contact with a conjugated polyene so that the ethylene-vinyl alcohol copolymer composition pellet has a conjugated polyene content of not higher than 0.06 wt. % based on the weight of the ethylene-vinyl alcohol copolymer composition pellet;
(D′) bringing the ethylene-vinyl alcohol copolymer pellet into contact with a lubricant so that the ethylene-vinyl alcohol copolymer composition pellet has a lubricant content of 0.001 to 0.15 wt. % based on the weight of the ethylene-vinyl alcohol copolymer composition pellet;
and
(E′) bringing the ethylene-vinyl alcohol copolymer pellet into contact with an alkali earth metal so that the ethylene-vinyl alcohol copolymer composition pellet has an alkali earth metal content of not higher than 100 ppm based on the weight of the ethylene-vinyl alcohol copolymer composition pellet,
wherein the boron compound-incorporated ethylene-vinyl alcohol copolymer pellet, after being dried, is brought into contact with a water/alcohol mixed solution containing water and an alcohol in a water-to-alcohol weight ratio (water/alcohol) of 80/20 to 0/100 or into contact with the alcohol in the rinsing of the boron compound-incorporated ethylene-vinyl alcohol copolymer pellet.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/445,320Filed 19 Jun 2019
Priority: JP 2016-25585228 Dec 2016
Published: 17 Oct 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification22 codes

B29B 9/12
Making granules: characterised by structure or composition
C08J 3/2053
In the presence of a continuous liquid phase: the additives only being premixed with a liquid phase
C08F 216/06
Acyclic compounds: polyvinyl alcohol ; Vinyl alcohol
C08J 5/18
Manufacture of articles or shaped materials containing macromolecular substances: manufacture of films or sheets

Family

Application16/445,320Continuation
US 11,267,941 B2Related patent
US 2019/0315933 A1This patent

From the US filing history. Foreign family members aren’t listed.

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