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 a dicycloaliphatic diepoxy 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.
Claims28
A composition comprising
- a polyester;
- 0.05 to 2 weight percent, based on the total weight of the polyester, of an alcohol of 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
- a dicycloaliphatic diepoxy 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;
- 0.1 to 1 weight percent, based on the total weight of the polyester, of an alcohol of the formula (III)
- wherein R3 is —CH3, —CH2CH3, or —CH2OH;
- 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexyl carboxylate, in an amount sufficient to provide 30 to 150 milliequivalents of epoxy per kilogram of polyester;
- and an alkali metal salt of a C8-C36 carboxylic acid catalyst, wherein
- the composition has a spiral flow value that is 30% or higher than the spiral flow value of the same composition without the alcohol and dicycloaliphatic diepoxy 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 wherein
- the tensile stress at yield of an article comprising the composition retains 45% or more of the tensile stress after aging at 110° C. for 336 hours at 100% relative humidity, wherein tensile stress at yield 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-alkanediol or chemical equivalent thereof;
- 0.1 to 1 weight percent, based on the total weight of the polyester, of an alcohol of the formula (III)
- wherein R3 is —CH3, —CH2CH3, or —CH2OH;
- 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexyl carboxylate, in an amount sufficient to provide 30 to 150 milliequivalents of epoxy per kilogram of polyester;
- and
- an alkali metal salt of a C8-C36 carboxylic acid catalyst, wherein
- the composition has a spiral flow value that is 30% or higher than the spiral flow value of the same composition without the alcohol and dicycloaliphatic diepoxy 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 wherein
- an article comprising the composition retains more of its tensile stress at yield after aging at 110° C. at 140 kilopascals for 120 hours at 100% relative humidity, relative to the same composition without the dicycloaliphatic diepoxy compound, wherein each tensile stress at yield is measured in accordance with ASTM D638.
Dependencies are inferred from the claim text.