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Polyesters having a controlled melting point and fibers formed therefrom

A fiber, polyester technology, applied in the field of adhesive fibers and polyester itself, to achieve the effect of color improvement

Inactive Publication Date: 2002-10-30
EASTMAN CHEM CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] By providing a polyester formed from the reaction product of at least about 50 mole percent diols having four or six carbon atoms and by controlling the amount of diethylene glycol and ethylene glycol to less than about 20 mole percent of the diol component, the present invention Addresses issues related to the aforementioned adhesive fibers and polyesters

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Example 1: Polyesters containing adipic acid

[0068] A polybutylene terephthalate (PBT) copolyester containing 42 mol % adipic acid was prepared as follows: A total of 56.32 g (0.25 mol) of dimethyl terephthalate, 38.06 g (0.18 mol) of Dimethyl adipate, 80.1 g (0.89 mol) of 1,4-butanediol and 0.5 ml of a solution of triisopropoxytitanium acetate in n-butanol (to provide 83 ppm of Ti) were dropped into a 500-ml round bottom flask and attached to the Camile control polymer reactor stand. The reaction mixture was stirred and heated at 190°C by a molten metal bath. The temperature was maintained at 190-210°C for 3 hours until all released methanol had distilled from the reaction mixture. The temperature was raised to 260°C and vacuum was gradually applied to the polycondensation reaction mixture. The temperature was maintained at 260°C for 2.75 hours and the pressure in the flask during the last 2 hours of polymerization was 0.1 mmHg. The metal bath was removed from th...

Embodiment 2

[0072] Example 2: Sheath / Core Bicomponent Fiber

[0073]50 / 50 sheath / core and 40 / 50 sheath / core were prepared using polyethylene terephthalate homopolymer (IV 0.55) as the core and a PBT copolyester similar to that described in Example 1 (IV 1.12) as the sheath. 60 sheath / core bicomponent fibers. The bicomponent was formed as follows: Crystallized, dry pellets of PET were melted in an extruder and fed as a core layer at a melting temperature of 273°C. As a skin layer, dry pellets of PBT copolyester were melted in a second extruder and fed into the block at a melt temperature of 225°C. The melt streams were coextruded through a spinneret having a sheath / core configuration at metering speeds adjusted to form fibers having 50% copolyester sheath / 50% PET core and 40% copolyester sheath / 60% PET core out. Fibers are exported at 1025m / m. The resulting spun fiber was 9d / f. The fiber was then drawn with rollers using a draw ratio of 2.85:1 to produce a 3.2 d / f fiber. The fibers w...

Embodiment 3

[0076] Example 3: Preparation of nonwoven web.

[0077] The 4d / f monocomponent adhesive fibers of Example 1 were homogeneously blended with PET staple fibers (21 / 4d / f) to provide a blend containing 20 wt% adhesive fibers. Forms 1-1 / 4 oz / yd on carding line 2 An intimately blended nonwoven web. The binder fibers in the nonwoven web are activated by passing the web through an infrared oven, followed by hot nipping to bond the fibers in the nonwoven web. Good longitudinal and transverse tensile strength and drapability are obtained. A strong bond was also obtained by passing the web from the card into an air circulating oven with a dwell time of 2 minutes at 180°C.

[0078] A 7.2 d / f X 2-inch 50 / 50 bicomponent as-spun binder fiber prepared similarly to Example 2 was homogeneously blended with PET staple fiber (5.5 d / f) to provide a binder fiber containing 25 wt % of blends. 3oz / yd 2 The fully blended web was heated on a dual-plate press at 163°C to activate the bond. A cont...

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Abstract

The invention relates to fibers, particularly binder fibers, made from polyesters and the polyesters themselves. The polyesters are the product of a reaction between a glycol component and a dicarboxylic acid component where the glycol component contains at least 50 mole % of a four carbon diol, such as 1,4-butanediol, or a six carbon diol, such as 1,6-hexanediol or a mixture of a four carbon and six carbon diol. Typically, the polyesters of the invention are semicrystalline and / or crystalline and have a specific melting point ranging from about 140 to about 185° C. The polyesters of the invention may be formed into a variety of products, especially binder fibers for nonwoven fabrics, textile / industrial yarns and fabrics, composites and other molded articles.

Description

field of invention [0001] The present invention relates to fibers, especially adhesive fibers made from polyester and polyester itself. The polyester is the reaction product between a diol component and a dicarboxylic acid component, wherein the diol component contains at least 50 mol% of a four-carbon diol, such as 1,4-butanediol, or a six-carbon diol, Such as 1,6-hexanediol or a mixture of four-carbon and six-carbon diols. Generally, the polyesters of the present invention are semicrystalline and / or crystalline and have specific melting points in the range of about 140°C to about 185°C. The polyesters of the present invention can be formed into a variety of products, especially binder fibers for nonwoven fabrics, textile / industrial yarns and fabrics, composites and other molded articles. Background of the invention [0002] It is well known that copolyesters can be prepared using processes involving polyesterification and polycondensation. Typically, the reactants inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/16C08G63/18C08G63/181C08G63/183C08G63/189C08G63/40C08G63/672D01F6/62D01F6/84D01F6/92D01F8/14
CPCC08G63/16C08G63/18C08G63/181C08G63/183C08G63/189C08G63/40C08G63/672D01F6/62D01F6/84D01F6/92D01F8/14Y10T428/2933Y10T428/2967Y10T428/2929Y10T428/2924Y10T428/2913Y10T428/2931
Inventor W·A·海勒L·R·德安R·L·麦康内尔K·C·赫马尼
Owner EASTMAN CHEM CO
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