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US 6,444,283 B1Granted
Polyester-polyamide blends with reduced gas permeability and low haze
AssigneeEastman Chemical Company
InventorsSam Richard Turner, Gary Wayne Connell, Steven Lee Stafford, John David Hewa
Life of this patent
Estimating the term…
Abstract
The invention relates to polyester/polyamide blend compositions for forming an article having low haze and reduced gas permeability compared to the polyester alone. More specifically, the invention relates to blends of semi-crystalline polyesters such as PET with low molecular weight polyamides and to the containers and packages for food, beverages, cosmetics, pharmaceuticals and personal care products that can be fabricated from these blends.
Claims17
A polymer blend comprising:
- I. from 80 to 97.5 weight % of a semi-crystalline polyester, which comprises the residues of
- (A) a dicarboxylic acid component comprising repeat units from at least about 80 mole % of terephthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid or a mixture thereof;
- and
- (B) a glycol component comprising repeat units from at least about 85 mole % ethylene glycol,
- wherein components A) and B) are based on 100 mole % dicarboxylic acid and 100 mole % of glycol;
- and
- II. from 20 to 2.5 weight % of a low molecular weight polyamide, having a number average molecular weight of less than about 15,000, having the repeating unit A-D, wherein A is the residue of a dicarboxylic acid comprising adipic acid, isophthalic acid, terephthalic acid, 1,4-cyclohexanedicarboxylic, resorcinol dicarboxylic acid, or naphthalenedicarboxylic acid, or a mixture thereof, and D is a residue of a diamine comprising m-xylylene diamine, p-xylylene diamine, hexamethylene diamine, ethylene diamine, or 1,4-cyclohexanedimethylamine, or a mixture thereof,
- wherein components I and II total 100weight % of the polymer blend.
5 more elements
A method for reducing gas permeability of polyester comprising blending:
- I. from 80 to 97.5 weight % of a semi-crystalline polyester, which comprises the residues of:
- (A) a dicarboxylic acid component comprising repeat units from at least about 85 mole % of terephthalic acid, naphthalene-2,6-dicarboxylic acid or a mixture thereof;
- and
- (B) a glycol component comprising repeat units from at least about 85 mole % ethylene glycol,
- wherein components A) and B) are based on 100 mole % dicarboxylic acid and 100 mole % of glycol;
- and
- II. from 20 to 2.5 weight % of a low molecular weight polyamide having a number average molecular weight of less than about 15,000 having the repeating unit A-D, wherein A is the residue of a dicarboxylic acid comprising adipic acid, isophthalic acid, terephthalic acid, 1,4-cyclohexanedicarboxylic, resorcinol dicarboxylic acid, or naphthalenedicarboxylic acid, or a mixture thereof, and D is the residue of a diamine comprising m-xylylene diamine, p-xylylene diamine, hexamethylene diamine, ethylene diamine, or 1,4-cyclohexanedimethylamine, or a mixture thereof,
- wherein components I and II total 100 weight % of the polymer blend.
5 more elements
A polymer blend comprising:
- I. from about 80 to about 97 weight % of a semi-crystalline polyester, which comprises the residues of
- (A) a dicarboxylic acid component comprising repeat units from at least about 80 mole % of terephthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid or a mixture thereof;
- and
- (B) a glycol component comprising repeat units from at least about 85 mole % ethylene glycol,
- wherein components A) and B) are based on 100 mole % dicarboxylic acid and 100 mole % of glycol;
- and
- II. from about 20 to about 3 weight %, having a number average molecular weight of less than about 15,000, having the repeating unit A-D, wherein A is the residue of a dicarboxylic acid comprising adipic acid, isophthalic acid, terephthalic acid, 1,4-cyclohexanedicarboxylic, resorcinol dicarboxylic acid, or naphthalenedicarboxylic acid, or a mixture thereof, and D is a residue of a diamine comprising m-xylylene diamine, p-xylylene diamine, hexamethylene diamine, ethylene diamine, or 1,4-cyclohexanedimethylamine, or a mixture thereof,
- wherein components I and II total 100 weight % of the polymer blend.
5 more elements
A method for reducing gas permeability of polyester comprising blending:
- I. from about 80 to about 97 weight % of a semi-crystalline polyester, which comprises the residues of:
- (A) a dicarboxylic acid component comprising repeat units from at least about 85 mole % of terephthalic acid, naphthalene-2,6-dicarboxylic acid or a mixture thereof;
- and
- (B) a glycol component comprising repeat units from at least about 85 mole % ethylene glycol,
- wherein components A) and B) are based on 100 mole % dicarboxylic acid and 100 mole % of glycol;
- and
- II. from about 20 to about 3 weight %, having a number average molecular weight of less than about 15,000, having the repeating unit A-D, wherein A is the residue of a dicarboxylic acid comprising adipic acid, isophthalic acid, terephthalic acid, 1,4-cyclohexanedicarboxylic, resorcinol dicarboxylic acid, or naphthalenedicarboxylic acid, or a mixture thereof, and D is a residue of a diamine comprising m-xylylene diamine, p-xylylene diamine, hexamethylene diamine, ethylene diamine, or 1,4-cyclohexanedimethylamine, or a mixture thereof,
- wherein components I and II total 100 weight % of the polymer blend.
5 more elements
An article comprising a polymer blend comprising:
- I. from 80 to 97.5 weight % of a semi-crystalline polyester, which comprises the residues of
- (A) a dicarboxylic acid component comprising repeat units from at least about 80 mole % of terephthalic acid, naphthalene-2,6-dicarboxylic acid or a mixture thereof;
- and
- (B) a glycol component comprising repeat units from at least about 85 mole % ethylene glycol,
- wherein components A) and B) are based on 100 mole % dicarboxylic acid and 100 mole % of glycol;
- and
- II. from 20 to 2.5 weight % of a low molecular weight polyamide, having a number average molecular weight of less than about 15,000, having the repeating unit A-D, wherein A is the residue of a dicarboxylic acid comprising adipic acid, isophthalic acid, terephthalic acid, 1,4-cyclohexanedicarboxylic, resorcinol dicarboxylic acid, or naphthalenedicarboxylic acid, or a mixture thereof, and D is a residue of a diamine comprising m-xylylene diamine,p-xylylene diamine, hexamethylene diamine, ethylene diamine, or 1,4-cyclohexanedimethylamine, or a mixture thereof,
- wherein components I and II total 100 weight % of the polymer blend and wherein the article has a haze value of from about 2 to about 5 times less than a polymer blend comprising polyester terephthalate and MXD6.
5 more elements
Dependencies are inferred from the claim text.