Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1994-09-09
1996-10-15
Short, Patricia A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525175, 264211, C08L 6702
Patent
active
055655220
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a polyester fiber which contains other additives in small amounts and a process for the production thereof. Polyester fibers according to the invention are taken to mean both endless filaments and finite fibers, such as for example, staple fibers.
BACKGROUND
It is known to spin polymer mixtures of polyesters and small amounts of a second polymer at high speeds between 1500 and 8000 m/min to form polyester yarns. Defined mixture polymers for this are described for polyester in EP 0 047 464. In addition to a series of acrylic polymers, polymethyl methacrylate is recommended there in particular as a polymeric reagent for polyethylene glycol terephthalate (i.e. polyethylene terephthalate or PET). However, when it is used, thread breaks have been reported at least at a spinning speed of 7500 m/min (cf. ibid example 3).
SUMMARY OF THE INVENTION
The object of the present invention is to provide a further fiber made essentially of polyethylene terephthalate and other additives. It is also the object of the present invention to provide a process for the production of this fiber.
The object of the invention is achieved by a fiber predominantly composed of polyethylene terephthalate as fiber polymer, which is characterized in that it contains 0.5 to 5% by weight, based on the fiber polymer, to 50 to 90% of imidated polyalkyl methacrylate, predominantly in the form of inclusions. These fibers surprisingly have a higher initial modulus in the final drawn state than is the case with the addition of acrylic polymers, including polymethyl methacrylate. The final drawn state of yarns is reached in all cases when the yarns exhibit the low breaking extensions required for their application. These breaking extensions are normally about 35% for textile yarns, whereas, for industrial yarns, breaking extensions of preferably less than 15% are sought.
The fiber according to the invention is preferably characterized in that it contains 0.1 to 5% by weight, based on the fiber polymer, to 50 to 90% of imidated polymethyl methacrylate. It has particularly favorable properties if the fraction of the imidated polyalkyl methacrylate or polymethyl methacrylate is 0.3 to 1% by weight. The fiber polymer is preferably polyethylene glycol terephthalate.
The object of the invention is also achieved by a process for the production of melt-spun fibers essentially composed of polyethylene terephthalate, by melting the fiber polymer and subsequent melt spinning, which is characterized in that the fiber polymer receives an admixture of 0.1 to 5% by weight, based on the fiber polymer, of a polymer only partially soluble in this and essentially composed of imidated polyalkyl methacrylates which are imidated up to 50 to 90% by reaction of polyalkyl methacrylates, the ester group of which contains an alcohol having 1 to 6 C atoms, with a primary amine having 1 to 3 C atoms, and the acid and/or anhydride content of which is less than 0.25 milliequivalents per gram and, possibly, other additives prior to the melt spinning.
DESCRIPTION OF PREFERRED EMBODIMENTS
Surprisingly, it has been found that polymer mixtures of polyesters and small amounts of another type of polymer narrowly restricted in terms of constitution can be spun at the high spinning speed mentioned and higher without problems with conventional thread break numbers. Even at spinning speeds as high as for example 8000 m/min, the melt-spin process according to the invention gives the very low thread break numbers conventional for polyester spinning.
The fiber polymers suitable are all high-melting fiber-forming polyesters, in particular those which are predominantly, that is at least up to 80%, composed of ethylene glycol terephthalate units. The remaining dicarboxylic acid and diol components of these (co)polyesters can be the co-components conventional in the production of drawn polyester forms, such as, for example, isophthalic acid, p,p'-biphenyldicarboxylic acid, all possible naphthalenedicarboxylic acids, hexahydroterephthalic ac
REFERENCES:
patent: 4246374 (1981-01-01), Kopchik
patent: 4609710 (1986-09-01), Iohara
patent: 5004777 (1991-04-01), Hallden-Abberton
Patents Abstracts of Japan, C-477 Feb. 19, 1988, vol. 12, No. 56.
Bohringer Bertram
Schilo Diederich
Akzo Nobel N.V.
Short Patricia A.
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