High flow polyester composition, method of manufacture, and uses thereof
AssigneeGeneral Electric Company
InventorSung Dug Kim
Life of this patent
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Abstract
A high flow polyester composition is disclosed, which comprises at least one polyester, at least one flow enhancing ingredient of structure (III), wherein R3 is a C1-C20 alkyl group optionally having one or more hydroxy group substituents, a C3-C20 cycloalkyl group, a C6-C20 aryl group, a C1-C20 alkoxy group optionally having one or more hydroxy group substituents, or a C6-C20 aryloxy group; and an aromatic epoxy compound, in an amount sufficient to provide 5 to 300 milliequivalents of epoxy per kilogram of polyester. The composition further optionally comprises reinforcing fillers, impact modifiers, a property-enhancing thermoplastic such as polycarbonate and flame retardant chemicals. The compositions are suitable for making automotive, electric and electronic parts.
Claims30
A composition comprising,
- a polyester;
- 0.05 to 2 weight percent, based on the total weight of the polyester, of an aminoalcohol of the formula (III)
- wherein R3 is a C1-C20 alkyl group optionally having one or more hydroxy group substituents, a C3-C20 cycloalkyl group, a C6-C20 aryl group, a C1-C20 alkoxy group optionally having one or more hydroxy group substituents, or a C6-C20 aryloxy group;
- and
- an aromatic epoxy compound, in an amount sufficient to provide 5 to 300 milliequivalents of epoxy per kilogram of polyester.
A composition comprising
- a polyester comprising units of the formula (II)
- wherein R′ is derived from a mixture of terephthalic acid and isophthalic acid or a chemical equivalent thereof, and R′ is derived from a C2-C4 alkanediol or a chemical equivalent thereof;
- 0.01 to 1 weight percent, based on the total weight of the polyester, of an aminoalcohol of the formula(III)
- wherein R3 is —CH3, —CH2CH3, or —CH2OH;
- an aromatic epoxy compound of the formula (IV)
- wherein Xa is a substituted or unsubstituted C1-C3 alkylidene bridging group, n is 1 to 6, and r and s are each 0, in an amount sufficient to provide 5 to 150 milliequivalents of epoxy per kilogram of polyester;
- and
- a catalytically effective amount of an alkali metal salt of a C8-C36 carboxylic acid;
- wherein
- the composition has a spiral flow value that is 30% or more of the spiral flow value of the same composition without the aminoalcohol and aromatic epoxy compound, wherein each spiral flow is measured at a melt temperature of 250-260° C., a mold temperature of 66° C., a gauge of 1.5 mm, and a pressure of 10 MPa;
- and
- the tensile stress at yield of an article comprising the composition retains 85% or more of its initial tensile strength after aging at 90° C. for 168 hours at 95% humidity, wherein each tensile strength is measured in accordance with ASTM D638.
A composition comprising
- a polyester comprising units of the formula (II)
- wherein R′ is derived from a mixture of terephthalic acid and isophthalic acid or a chemical equivalent thereof, and R′ is derived from a C2-C4 alkanediol or a chemical equivalent thereof;
- 0.01 to 1 weight percent, based on the total weight of the polyester, of an aminoalcohol of the formula(III)
- wherein R3 is —CH3, —CH2CH3, or —CH2OH;
- an aromatic epoxy compound of the formula (IV)
- wherein Xa is a substituted or unsubstituted C1-C3 alkylidene bridging group, n is 1 to 6, and r and s are each 0, in an amount sufficient to provide 5 to 150 milliequivalents of epoxy per kilogram of polyester;
- and
- a catalytically effective amount of an alkali metal salt of a C8-C36 carboxylic acid;
- wherein
- the composition has a spiral flow value that is 30% or more of the spiral flow value of the same composition without the aminoalcohol and aromatic epoxy compound, wherein each spiral flow is measured at a melt temperature of 250-260° C., a mold temperature of 66° C., a gauge of 1.5 mm, and a pressure of 10 MPa;
- and
- an article comprising the composition retains more of its tensile strength after aging at 90° C. for 168 hours at 95% relative humidity, relative to the same composition without the aromatic epoxy compound, wherein each tensile strength is measured in accordance with ASTM D638.
Dependencies are inferred from the claim text.