US5384184A — Polyester block copolymer and elastic yarn compos…

Claim 1

Independent Claim 170 words

A polyester block copolymer having an inherent viscosity of at least 0.6, which comprises (A) 30 to 90% by weight of polyester segments comprised of at least 70 mols percent of benzenedicarboxylic acid as the main acid component and a diol having 5 to 12 carbon atoms between the hydroxyl groups as the main glycol component and (B) 70 to 10% by weight of polyester segments comprising an aromatic dicarboxylic acid as the main acid component and ethylene glycol, trimethylene glycol, tetramethylene glycol or 1,4-cyclohexane dimethanol as the main glycol component, wherein (i) when a polyester having an inherent viscosity of at least 0.6 is formed by polycondensation of the components constituting the polyester segments (A), the melting point of the obtained polyester is lower than 50° C. or the obtained polyester is amorphous, and (ii) when a polyester having an inherent viscosity of at least 0.6 is formed by polycondensation of the components constituting the polyester segments (B), the melting point of the polyester is higher than 180° C.

Claim 2

Dependent Claim 170 words

A polyester block copolymer having an inherent viscosity of at least 0.6, which comprises (A) 30 to 90% by weight of polyester segments comprised of at least 70 mols percent of benzenedicarboxylic acid as the main acid component and a diol having 5 to 12 carbon atoms between the hydroxyl groups as the main glycol component and (B) 70 to 10% by weight of polyester segments comprising an aromatic dicarboxylic acid as the main acid component and ethylene glycol, trimethylene glycol, tetramethylene glycol or 1,4-cyclohexane dimethanol as the main glycol component, wherein (i) when a polyester having an inherent viscosity of at least 0.6 is formed by polycondensation of the components constituting the polyester segments (A), the melting point of the obtained polyester is lower than 50° C. or the obtained polyester is amorphous, and (ii) when a polyester having an inherent viscosity of at least 0.6 is formed by polycondensation of the components constituting the polyester segments (B), the melting point of the polyester is higher than 180° C.

Claim 3

Dependent Claim 30 words

A polyester block copolymer as set forth in claim 1, wherein the compound to be copolymerized is selected from 5-sodium sulfoisophthalic acid, 5-tetrabutyl phosphonium sulfoisophthalic acid and dimethyl esters thereof.

Claim 4

Dependent Claim 20 words

A polyester block copolymer as set forth in claim 1, wherein the compound to be copolymerized is selected from ##STR5##

Claim 5

Dependent Claim 159 words

A polyester block copolymer as set forth in claim 1, which is a polyester block copolymer obtained by melt-mixing 30 to 90% by weight of a polyester (A') which has an intrinsic viscosity of 0.6 to 1.5 and has a melting point lower than 50° C. or is amorphous and comprises a benzenedicarboxylic acid as the main acid component and an aliphatic diol having 5 to 12 carbon atoms between the hydroxyl groups as the main glycol component, with 70 to 10% by weight of a high-melting-point polyester (B') having a melting point higher than 180° C. and an inherent viscosity of 0.6 to 1.5 and comprising an aromatic dicarboxylic acid as the main acid component and ethylene glycol, trimethylene glycol, tetramethylene glycol or 1,4-cyclohexane dimethanol as the main glycol component, to effect ester exchange reaction, and the melting point of the block copolymer is lower by 2 to 40° C. than the melting point of the polyester (B').

Claim 6

Dependent Claim 38 words

A polyester block copolymer as set forth in claim 4, wherein the amount of the polyester (A') employed is 50 to 85% by weight and the amount of the polyester (B') employed is 50 to 15% by weight.

Claim 7

Dependent Claim 15 words

An elastic yarn composed of a polyester block copolymer as set forth in claim 1.

Claim 8

Dependent Claim 192 words

An elastic yarn as set forth in claim 6, wherein the polyester block copolymer is a polyester block copolymer obtained by melt-mixing 70 to 90% by weight of a polyester (A') which has an intrinsic viscosity of 0.6 to 1.5 and has a melting point lower than 50° C. or is amorphous and comprises a benzenedicarboxylic acid as the main acid component and an aliphatic diol having 5 to 12 carbon atoms between the hydroxyl groups as the main glycol component, with 30 to 10% by weight of a polyester (B') having a melting point higher than 180° C. and an inherent viscosity of 0.6 to 1.5 and comprising terephthalic acid as the main acid component and ethylene glycol trimethylene glycol or tetramethylene glycol as the main glycol component, to effect ester exchange reaction, the melting point of the block copolymer is lower by 2° to 40° C. than the melting point of the polyester (B'), the elastic recovery ratio after 200% stretching of the elastic yarn is at least 90%, and when the elastic yarn is heat-treated at 130° C. for 10 minutes, agglutination does not occur in the elastic yarn.

Claim 9

Dependent Claim 37 words

An elastic yarn as set forth in claim 7, wherein the amount of the polyester (A') employed is 75 to 85% by weight and the amount of the polyester (B') employed is 25 to 15% by weight.

Claim 10

Dependent Claim 259 words

A polyester block copolymer having an inherent viscosity of at least 0.6, which comprises (a) 30 to 90% by weight of polyester segments comprising a benzenedicarboxylic acid as the main acid component and an aliphatic diol having 5 to 12 carbon atoms between the hydroxyl groups as the main glycol component and (B) 70 to 10% by weight of polyester segments comprising an aromatic dicarboxylic acid as the main acid component and ethylene glycol, trimethylene glycol, tetramethylene glycol or 1,4-cyclohexane dimethanol as the main glycol component, wherein (i) when a polyester having an inherent viscosity of at least 0.6 is formed by polycondensation of the components constituting the polyester segments (A), the melting point of the obtained polyester is lower than 50° C. or the obtained polyester is amorphous, and (ii) when a polyester having an inherent viscosity of at least 0.6 is formed by polycondensation of the components constituting the polyester segments (B), the melting point of the polyester is higher than 180° C., and wherein at least one member selected from the group consisting of compounds represented by the following formulae is copolymerized in an amount of 0.1 to 5 mole % based on the total acid components constituting the polyester block copolymers: ##STR6## wherein M represents an alkali metal or PR 1 R 2 R 3 R 4 , R 1 , R 2 , R 3 and R 4 , which may be the same or different, represent a hydrocarbon group having 1 to 8 carbon atoms, and X - represents a sulfonic acid anion.

Claim 11

Dependent Claim 259 words

A polyester block copolymer having an inherent viscosity of at least 0.6, which comprises (a) 30 to 90% by weight of polyester segments comprising a benzenedicarboxylic acid as the main acid component and an aliphatic diol having 5 to 12 carbon atoms between the hydroxyl groups as the main glycol component and (B) 70 to 10% by weight of polyester segments comprising an aromatic dicarboxylic acid as the main acid component and ethylene glycol, trimethylene glycol, tetramethylene glycol or 1,4-cyclohexane dimethanol as the main glycol component, wherein (i) when a polyester having an inherent viscosity of at least 0.6 is formed by polycondensation of the components constituting the polyester segments (A), the melting point of the obtained polyester is lower than 50° C. or the obtained polyester is amorphous, and (ii) when a polyester having an inherent viscosity of at least 0.6 is formed by polycondensation of the components constituting the polyester segments (B), the melting point of the polyester is higher than 180° C., and wherein at least one member selected from the group consisting of compounds represented by the following formulae is copolymerized in an amount of 0.1 to 5 mole % based on the total acid components constituting the polyester block copolymers: ##STR6## wherein M represents an alkali metal or PR 1 R 2 R 3 R 4 , R 1 , R 2 , R 3 and R 4 , which may be the same or different, represent a hydrocarbon group having 1 to 8 carbon atoms, and X - represents a sulfonic acid anion.

Claim 12

Dependent Claim 11 words

A knitted fabric comprised of the elastic yarn of claim 6.

Claim 13

Dependent Claim 11 words

A knitted fabric comprised of the elastic yarn of claim 7.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1998-01-23	1998-07-25	1999-01-24	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2002-01-23	2002-07-25	2003-01-24	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2006-01-23	2006-07-25	2007-01-24	$7700.00	Window Closed / Lapsed

Polyester block copolymer and elastic yarn composed thereof

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