Copolyester/polyamide blend having improved flavor retaining property and clarity

Claim 2

An essentially noncrystalline copolyester composition having an improved flavor retaining property comprising: (A) 98.0 to 99.95 weight percent of a copolyester which comprises (1) a dicarboxylic acid component comprising repeat units from at least 50 mole percent terephthalic acid; and (2) a diol component comprising repeat units from at least 50 mole percent ethylene glycol; based on 100 mole percent dicarboxylic acid and 100 mole percent diol, provided that there is at least 20 mole percent dicarboxylic acid or diol comonomers present in the copolyester; and (B) 2.0 to 0.05 weight percent of a nonhydroxyfunctional polyamide, wherein the combined weights of (A) and (B) total 100 percent.

Claim 3

An essentially noncrystalline copolyester composition having an improved flavor retaining property comprising: (A) 98.0 to 99.95 weight percent of a copolyester which comprises (1) a dicarboxylic acid component comprising repeat units from at least 50 mole percent terephthalic acid; and (2) a diol component comprising repeat units from at least 50 mole percent ethylene glycol; based on 100 mole percent dicarboxylic acid and 100 mole percent diol, provided that there is at least 20 mole percent dicarboxylic acid or diol comonomers present in the copolyester; and (B) 2.0 to 0.05 weight percent of a low molecular weight nonhydroxyfunctional polyamide selected from the group consisting of low molecular weight partially aromatic nonhydroxyfunctional polyamides having a number average molecular weight of less than 15,000, low molecular weight aliphatic nonhydroxyfunctional polyamides having a number average molecular weight of less than 7,000, and combinations thereof, wherein the combined weights of (A) and (B) total 100 percent.

Claim 4

An essentially noncrystalline copolyester composition having an improved flavor retaining property comprising: (A) 98.0 to 99.95 weight percent of a copolyester which comprises (1) a dicarboxylic acid component comprising repeat units from at least 50 mole percent terephthalic acid; and (2) a diol component comprising repeat units from at least 50 mole percent ethylene glycol; based on 100 mole percent dicarboxylic acid and 100 mole percent diol, provided that there is at least 20 mole percent dicarboxylic acid or diol comonomers present in the copolyester; and (B) 2.0 to 0.05 weight percent of a low molecular weight nonhydroxyfunctional polyamide selected from the group consisting of low molecular weight partially aromatic nonhydroxyfunctional polyamides having a number average molecular weight of less than 15,000, low molecular weight aliphatic nonhydroxyfunctional polyamides having a number average molecular weight of less than 7,000, and combinations thereof, wherein the combined weights of (A) and (B) total 100 percent.

Claim 5

A heat molded or draw formed plastic article composed of an essentially noncrystalline copolyester composition comprising: (A) 98.0 to 99.95 weight percent of a copolyester which comprises (1) a dicarboxylic acid component comprising repeat units from at least 50 mole percent terephthalic acid; and (2) a diol component comprising repeat units from at least 50 mole percent ethylene glycol; based on 100 mole percent dicarboxylic acid and 100 mole percent diol, provided that there is at least 20 mole percent dicarboxylic acid or diol comonomers present in the copolyester; and (B) 2.0 to 0.05 weight percent of a nonhydroxyfunctional polyamide, wherein the combined weights of (A) and (B) total 100 percent.

Claim 6

A heat molded or draw formed plastic article composed of an essentially noncrystalline copolyester composition comprising: (A) 98.0 to 99.95 weight percent of a copolyester which comprises (1) a dicarboxylic acid component comprising repeat units from at least 50 mole percent terephthalic acid; and (2) a diol component comprising repeat units from at least 50 mole percent ethylene glycol; based on 100 mole percent dicarboxylic acid and 100 mole percent diol, provided that there is at least 20 mole percent dicarboxylic acid or diol comonomers present in the copolyester; and (B) 2.0 to 0.05 weight percent of a nonhydroxyfunctional polyamide, wherein the combined weights of (A) and (B) total 100 percent.

Claim 7

A heat molded or draw formed plastic article composed of an essentially noncrystalline copolyester composition comprising: (A) 98.0 to 99.95 weight percent of a copolyester which comprises (1) a dicarboxylic acid component comprising repeat units from at least 50 mole percent terephthalic acid; and (2) a diol component comprising repeat units from at least 50 mole percent ethylene glycol; based on 100 mole percent dicarboxylic acid and 100 mole percent diol, provided that there is at least 20 mole percent dicarboxylic acid or diol comonomers present in the copolyester; and (B) 2.0 to 0.05 weight percent of a low molecular weight nonhydroxyfunctional polyamide selected from the group consisting of low molecular weight partially aromatic nonhydroxyfunctional polyamides having a number average molecular weight of less than 15,000, low molecular weight aliphatic nonhydroxyfunctional polyamides having a number average molecular weight of less than 7,000, and combinations thereof, wherein the combined weights of (A) and (B) total 100 percent.

Claim 8

A heat molded or draw formed plastic article composed of an essentially noncrystalline copolyester composition comprising: (A) 98.0 to 99.95 weight percent of a copolyester which comprises (1) a dicarboxylic acid component comprising repeat units from at least 50 mole percent terephthalic acid; and (2) a diol component comprising repeat units from at least 50 mole percent ethylene glycol; based on 100 mole percent dicarboxylic acid and 100 mole percent diol, provided that there is at least 20 mole percent dicarboxylic acid or diol comonomers present in the copolyester; and (B) 2.0 to 0.05 weight percent of a low molecular weight nonhydroxyfunctional polyamide selected from the group consisting of low molecular weight partially aromatic nonhydroxyfunctional polyamides having a number average molecular weight of less than 15,000, low molecular weight aliphatic nonhydroxyfunctional polyamides having a number average molecular weight of less than 7,000, and combinations thereof, wherein the combined weights of (A) and (B) total 100 percent.

Claim 9

The copolyester according to claim 1 wherein the dicarboxylic acid component consists essentially of repeat units from terephthalic acid and the diol component consists essentially of repeat units from 60 to 75 mole percent ethylene glycol and 25 to 40 mole percent 1,4-cyclohexanedimethanol.

Claim 10

The article according to claim 3 wherein the dicarboxylic acid component consists essentially of repeat units from terephthalic acid and the diol component consists essentially of repeat units from 60 to 75 mole percent ethylene glycol and 25 to 40 mole percent 1,4-cyclohexanedimethanol.

Claim 11

The composition according to claim 1 wherein the nonhydroxyfunctional polyamide is selected from the group consisting of poly(m-xylylene adipamide), poly(hexamethylene adipamide), polycaprolactam, poly(hexamethylene isophthalamide), poly(hexamethylene adipamide-co-isophthalamide), poly(hexamethylene adipamide-co-terephthalamide), and poly(hexamethylene isophthalamide-co-terephthalamide).

Claim 12

The composition according to claim 7 wherein the nonhydroxyfunctional polyamide is poly(m-xylylene adipamide).

Claim 13

The composition according to claim 2 wherein the low molecular weight partially aromatic nonhydroxyfunctional polyamide is selected from the group consisting of poly(m-xylylene adipamide), poly(hexamethylene isophthalamide), poly(hexamethylene adipamide-co-isophthalamide), poly(hexamethylene adipamide-co-terephthalamide), and poly(hexamethylene isophthalamide-co-terephthalamide).

Claim 14

The composition according to claim 9 wherein the low molecular weight partially aromatic nonhydroxyfunctional polyamide is poly(m-xylylene adipamide).

Claim 15

The composition according to claim 2 wherein the low molecular weight aliphatic nonhydroxyfunctional polyamide is selected from the group consisting of poly(hexamethylene adipamide) and poly(caprolactam).

Claim 16

The composition according to claim 11 wherein the low molecular Weight aliphatic nonhydroxyfunctional polyamide is poly(hexamethylene adipamide).

Claim 17

The composition according to claim 1 further comprising an additive selected from the group consisting of impact modifiers, surface lubricants, denesting agents, stabilizers, antioxidants, ultraviolet light absorbing agents, metal deactivators, colorants, phosphate stabilizers and fillers.

Claim 18

The article according to claim 3 further comprising an additive selected from the group consisting of crystallization aids, impact modifiers, surface lubricants, denesting agents, stablizers, antioxidants, ulraviolet light absorbing agents, metal deactivators, colorants, phosphate stabilizers and fillers.