Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Reexamination Certificate
2002-06-14
2003-09-16
Acquah, Samuel A. (Department: 1711)
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
C428S364000, C528S298000, C528S302000, C528S308000
Reexamination Certificate
active
06620362
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a manufacturing method of polyester fiber having improved light fastness, particularly relates to a method comprising copolymerizing polyester and ester forming monomer having the structure of naphthalene ring into copolyester, subjecting the copolyester component formed to spin-draw process to obtain fiber which has excellent light fastness after dyeing, can prevent from the cracking caused by ultraviolet radiation, is suitable for the automobile interior decoration, curtain and outdoor application, and can keep fresh color, without fading, even being exposed to sunlight for a long time.
DESCRIPTION OF THE PRIOR ART
Polyester has excellent physical property, therefore is widely used in various application such as fiber, membrane, engineering plastic, etc., wherein the fiber can be used in home decoration, automobile interior decoration, industrial fiber, etc., besides garment application. However, with respect to the automobile interior decoration, as the final products made from fiber are frequently exposed to the sunlight, the high temperature and the ultraviolet radiation can cause the dyeing molecule in the fiber to decompose and crack, leading to fading.
In pursuit of Unproved polyester fiber, various proposals have been put forwarded to obtain desirable light fastness. For example, the U.S. Pat. Publication No. 4,789,382 disclosed that adding ultraviolet radiation absorber like benzophenone in the dye bath to improve light fastness. The U.S. Pat. Publication No. 4,110,301 disclosed a photo rearrangement compound having the ability of improving light fastness of polyester fiber; wherein the photo rearrangement compound can be added to the dye bath or added during the spinning process. The Japan laid open publication No. 1990-41468 disclosed that adding ultraviolet radiation absorber like benzotriazole in the dye bath to improve light fastness. Moreover, the Japan laid open publication No. 1992-339885 disclosed that adding ultraviolet radiation absorber like benzotriazole and benzophenone in the dye bath together to improve light fastness. Furthermore, the Japan laid open publication No. 1987-276018 disclosed that adding three kinds of components such as ultraviolet radiation absorber like benzotriazole, tetramethyl piperidine compound and aliphatic polyester polyol during the spinning process to improve light fastness. The Japan laid open publication No. 1992-240212 disclosed that adding ultraviolet radiation absorber like acrylic copolymer comprising 2-hydroxy-4-(methacryloyloxy ethoxy)benzophenone to improve light fastness. The U.S. Pat. Publication No. 4,189,476 disclosed that applying aromatic polyester comprising 10 to 23 mole % of 2,6-dioxynaphthalene to produce melting polyester fiber possessing high elon and high modulus properties, wherein the dosage of easter forming monomer like 2,6-dioxy naphthalene is high as 10 to 23 mole % and the melting polyester fiber is of high elon and high modulus. However the effect of above mentioned proposals are not desirable, there is a continuing need for improved polyester fiber. In the above described Japan laid open publication No. 1987-276018, combining tetramethyl piperidine compound with ultraviolet radiation absorber like benzotriazole as well as aliphatic polyester polyol are used to improve light fastness, however, there's no improvement to the phenomenon of bad sublimation degree of ultraviolet radiation absorber like benzotriazole, and as the aliphatic polyester polyol added is a low molecule substance, it lead to the disadvantage that the fiber has a lower physical property.
In the above described Japan laid open publication No. 1992-240212, an ultraviolet radiation absorber such as acrylic copolymer comprising 2-hydroxy-4 (methacryloyloxy ethoxy)benzophenone is applied, however the compound has undesired heat resistance, when it is added into the polymer during late polymerization process, the luster was changed to yellow sharply, leading to the fiber displaying yellowish luster. Furthermore, adding powdery ultraviolet radiation absorber during late polymerization process puts difficulties in the way of production and operation.
As for the method of adding ultraviolet radiation absorber such as benzophenone and ultraviolet radiation absorber such as benzotriazole in the dye bath, as the ultraviolet radiation absorber like benzotriazole has an undesired sublimation degree, and the ultraviolet radiation absorber like benzophenone has an undesired affinity for polyester fiber, effective absorption can not be achieved. In addition, both ultraviolet radiation absorber like benzophenone and ultraviolet radiation absorber like benzotriazole applied in the above described patents are yellow powder, this causes the fiber formed displaying light yellow color, therefore leading to the adverse effect of dyeing offset. Furthermore, the ultraviolet radiation absorber added is a small molecule substance, having not bonded with the polymer, therefore it can move to the fiber surface during the late processing stage and the application stage, causing pollution; after several times of application and washing, it has a lowered effective composition; or after long time exposure, it displays some adverse results, like lower effectiveness, etc. due to gradual decomposition.
OBJECT OF THE INVENTION
One object of the invention is to provide a method that can effectively improve light fastness of fiber, that has no problems of lowered effective composition and problems of pollution caused by ultraviolet radiation absorber moving to the fiber surface; furthermore, the fiber produced has excellent whiteness and fresh color after dyeing, without dyeing offset caused by ultraviolet radiation absorber displaying yellowish. Another object of the invention is to provide a polyester fiber that possesses excellent and permanent light fastness property with white appearance and fresh color after dyeing, and is suitable for automobile interior decoration and outdoor application.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
As a result of an intensive study, the inventor proposes the present invention for the abovementioned objects, which relate to a fiber formed by copolymerizing the ester forming monomer monomer represented by formula (1) and polyester, said fiber possesses excellent light fastness.
R
2
OOC—R
1
—COOR
3
(1)
(wherein R
1
is a naphthalene ring, R
2
and R
3
are selected from the alkyl having one to four hydrogen atoms or carbon atoms, and R
2
is independent from R
3
, R
2
can be the same or different with R
3
; the position of substitute group for the naphthalene ring on the ester forming monomer can be: -2,3-, -
2,5-
, -
2,6-
, -
2,7-
, -
1,2-
, -
1,3-
, -
1,4-
, -
1,5-
, -
1,6-
, -
1,7-
, -1,8-)
As the compound is bonded into the polyester molecule in the form of copolymerization, no such problems as pollution and undesired sublimation degree caused by compound moving to fiber surface therefore. Furthermore, as the final product is a copolyester, fiber produced by the copolyester has excellent physical property, without reduction of fiber physical property comparing with that of adding low molecule substance like aliphatic polyester polyol. The copolyester obtained has excellent whiteness, no normal yellowish problem caused by ultraviolet radiation absorber, and fiber formed can be dyed to fresh color without the defect of dyeing offset. Examples of the ester forming monomers of formula (1) used in the present invention include: 2,6-naphthalene-dicarboxylic acid, dimethyl-2,6-naphthalene-dicarboxylete, diethyl-2,6-naphthalene-dicarboxylate, dipropyl-2,6-naphthalene-dicarboxylate, di-n-butyl-2,6-naphthalene-dicarboxylate, 2,5-naphthalene-dicarboxylic acid, dimethyl-2,5-naphthalene-dicarboxylate, diethyl-2,5-naphthalene-dicarboxylate, dipropyl-2,5-naphthalene-dicarboxylate, di-n-butyl-2,5-naphthalene-dicarboxylate, and similar compounds etc.
The addition amount of the ester forming monomers of formula (1), based upon the total dicarboxylic acid components
Acquah Samuel A.
Bacon & Thomas
Nan Ya Plastics Corporation
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