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US 12,053,951 B2Granted
Multilayer article suitable for use as a fuel container
AssigneeKuraray Co., Ltd.
InventorMasakazu Nakaya
Life of this patent
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Abstract
A multilayer article is provided which is suitable for use in making (or as) a fuel container by rotational molding, wherein the multilayer article has at least one layer of a thermally cured polymer composition and another layer of a barrier polymer composition, wherein the barrier polymer composition comprises a specified modified ethylene-vinyl alcohol copolymer as a barrier polymer.
Claims16
A multilayer article obtained by a rotational molding process, the multilayer article comprising:
- at least one layer of a thermally cured polymer composition (B);
- and
- a seamless layer of a barrier polymer composition (A), wherein:
- (i) the barrier polymer composition (A) consists of an ethylene-vinyl alcohol copolymer modified with a group containing at least one pendent primary hydroxyl group of formula(I);
- wherein X is selected from hydrogen a methyl group and a hydroxyalkyl group represented by the formula R2—OH;
- and R1 is selected from a direct bond and an alkylene group having a carbon number of from 1 to 9, and R2 is selected from a direct bond, an alkylene group having a carbon number of from 1 to 9, and an alkyleneoxy group having a carbon number of from 1 to 9,
- wherein the alkylene and alkyleneoxy group optionally contain one or more pendant hydroxyl groups, alkoxy groups and/or halogens and a compound selected from the group consisting of an alkali metal salt, a phosphoric acid compound, a boron compound and a mixture thereof,
- wherein
- an ethylene content of the modified ethylene-vinyl alcohol copolymer is from about 18 to about 55 mol %,
- (ii) the melt temperature of the barrier polymer composition (A) is less than about 160° C.;
- (iii) the thermally cured polymer composition (B) comprises a thermally cured polymer;
- (iv) the thermally cured polymer composition comprises from about 0.001 wt % to about 1 wt % of one or more materials selected from the group consisting of a hydrotalcite compound, a hindered phenol-based heat stabilizer, a hindered amine-based heat stabilizer, and a metal salt of a higher fatty carboxylic acid;
- and wherein a monolayer film prepared from the barrier polymer composition (A) exhibits an oxygen permeability that is less than about 3.2cc, 20 micron/m2.day.atm.
10 more elements
A fuel container which is a multilayer article obtained by a rotational molding process, the multilayer article comprising:
- at least one layer of a thermally cured polymer composition (B);
- and
- a seamless layer of a barrier polymer composition (A), wherein:
- (i) the barrier polymer composition (A) consists of an ethylene-vinyl alcohol copolymer modified with a group containing at least one pendent primary hydroxyl group of formula(I);
- wherein X is selected from hydrogen a methyl group and a hydroxyalkyl group represented by the formula R2—OH;
- and R1 is selected from a direct bond and an alkylene group having a carbon number of from 1 to 9, and R2 is selected from a direct bond, an alkylene group having a carbon number of from 1 to 9, and an alkyleneoxy group having a carbon number of from 1 to 9,
- wherein the alkylene and alkyleneoxy group optionally contain one or more pendant hydroxyl groups, alkoxy groups and/or halogens and a compound selected from the group consisting of an alkali metal salt, a phosphoric acid compound, a boron compound and a mixture thereof,
- wherein
- the modified ethylene-vinyl alcohol copolymer comprises:
- (a) an ethylene content from about 18 to about 55 mol %;
- (ii) the melt temperature of the barrier polymer composition (A) is less than about 160° C.;
- (iii) the thermally cured polymer composition (B) comprises a thermally cured polymer;
- (iv) the thermally cured polymer composition comprises from about 0.001 wt % to about 1 wt % of one or more materials selected from the group consisting of a hydrotalcite compound, a hindered phenol-based heat stabilizer, a hindered amine-based heat stabilizer, and a metal salt of a higher fatty carboxylic acid;
- and wherein a monolayer film prepared from the barrier polymer composition (A) exhibits an oxygen permeability that is less than about 3.2cc, 20 micron/m2.day.atm.
11 more elements
Dependencies are inferred from the claim text.