DE1469069A1 - Polypropylene based fiber - Google Patents

Description

PATENTANWÄLTE 7/13 STUTTGART-N Z3. «August ... 1960

__, ». _1Λ ., ... "'...-,., LANGE STRASSE 51

DR.-ING. WOLFF «nd BARTELS, Fernruf,» öio \

U69069 'Reg. Ur. 117 89ί

Eastman Kodak Company, Rochester, Hew York State-, United States of America.

• Paser based on polypropylene

The invention relates to and has been made of polypropylene fibers The task of creating essentially crystalline polypropylene fibers that have excellent dye affinity and fastness properties and good properties Have resistance to oxidation and weathering. In particular, the invention relates Polypropylene fibers which are modified with certain other polymers according to the invention: acrylic acid or methacrylic acid stone.

It is known that polypropylene, especially · partially or completely crystalline polypropylene, eu eynthetiaohen fibers with exceptional phyeikmliechen properties can be spun. This polymer Weicat, however, a number of parts, the "one

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Application in the manufacture of faeern for general Greatly restrict purposes «For example, cup-molecular fiber-forming crystalline polyolefins * such as Polypropylene, a relatively insoluble material, chemically inert », hydrophobic material represents ·· Oa it -von fasser sifts is easily penetrable- »it can not be dyed in a satisfactory quiet way according to the Ublioben ffttrvbe method · Since it is chemically inert in terms of temperature, it can itself old dyes soluble in hydrocarbons are not be permanently colored. Derliberhinsue can game and Fibers made from essentially crystalline polypropylene cannot be dyed with many dispersed metallic and acidic dyes unless they are colored, and such yarns and fibers can also do anything not xu deep ϊοηβη old good love and gas ob / thelt be colored In addition, the usefulness of clay is made of polypropylene fibers due to their susceptibility to oxidation Limited degradation, instability against ultra-tlolette light and poor weather characteristics. There is therefore a there is a great need for fibers, which are raging mentioned disadvantages are free, in order to expand the applicability of the polypropylene on the Textllgeblet see below «

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Problem * polypropylene fibers su create * the one high toughness, low elongation and other properties that are valuable for such fibers »without at the same time being affected by the above-described skin parts, has been a concern of the specialist world for a long time Number of years. According to the invention, it has been possible to to create such a polypropylene fiber,

The object of the invention, therefore, 1st the creation of polypropylene fibers with improved dye-affinity, in other words of polypropylene yarns and, "- fibers with such an improved Färbekennwerten that they a f ± k plurality of dispersed, Metallatoae containing and acidic dyes can be dyed old ,, the unmedifizlec" - Do not normally dye polypropylene · In particular, it is possible to dye partially or completely crystalline polypropylene in deep shades of color which are excellent in terms of light and gas resistance. The polypropylene yarns and fibers according to the invention are said to have a greatly improved resistance to oxidation and weathering in addition to good general physical properties.

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The tasks set are carried out according to the requirements Fibers dissolved, which consist of a Polymerisatmiechung of polypropylene and about one to twenty-five, preferably about 5 to 15 percent by weight, based on the polypropylene, consists of at least one polymer the acrylate or methacrylate units of the following general formula on welets

I R

- CHn - C '- C * ■ Ολλ - #

¹ - *
E.

in the

E is a hydrogen atom or a methyl group and

R _{1 is} an alkyl, alkoacyalkyl *, cycloalkyl, aralkyl or aryl group with preferably up to 12 carbon atoms

mean »Such pelymezi sate mixtures can lead to fibers and high tenacity yarns of the same percentage composition are spun the one excellent dye affinity against dispersed, Have metal atoms (so-called pre-metallized) and acidic dyes. The thus obtained f & rfcten Products have an excellent light and

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eehheit as well as «Ine unexpectedly good stability against Oxidation".

Me cognition that certain Polymerisatraisehungen of crystalline polypropylene and polymers of acrylic acid * "or methacrylic au fibers and yarns with high strength and excellent affinity to dispersing * - te and dyes containing metal atoms spun who can 9n & **" as well as the excellent light and Gasfast * "the nature of such dyeings was extremely surprising, as it could not be predicted in any way." As far as poly (methyl methacrylate) sum modification of vinyl resin fibers, such as acrylonitrile fibers, has been used up to now, it only gave them a slight affinity for dispersed dyes and products dyed in this way showed very poor lightfastness.

Although unmodified polypropylene practically none at all Shows affinity for dyes, it can be dyed with certain dyes to pale shades with very poor fastness properties.

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Surprisingly, it has now been shown that dl · shades » which one by means of a given dye on yarn made of unmodified polypropylene on the one hand and on the Modification used according to the invention on the other hand can be achieved "are completely different from those shades that can be found with the same dyes" · obtained according to modified polypropylene yarns This unexpected result shows that the polymers made from the named polymer! - Eating smells of spun fibers show * the properties one would normally not expect fibers from simple blends of the polymer products in question. " I »connection with it * has also been shown that according to the invention modified polypropylene fibers three to animal times are more resistant to oxidative degradation "than fibers made from unmodified polypropylene"

They are modified polypropylene fibers according to the invention also more stable against ultraviolet light and weather conditions than unmodified polypropylene fibers · Der örund for the increased stability of the modified polypropylene fibers against oxidation, light and weather conditions not completely clarified · Possibly free radicals, which are formed from the modifying polymers, combine become «with free radicals formed from polypropylene

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and thus prevent chain reactions that would otherwise lead to rapid deterioration of the polyolefin * It is possible that the modifying polymers also act as an absorbent for actinic radiation energy, which could otherwise activate a breakdown of the polypropylene by a radical mechanism.

The modified polypropylene fibers according to the invention and -Yarns can be mixed with any stabilizers customary for polyolefins further stabilized against thermal degradation and against weathering influences · In general, it is practical to add such stabilizers to the polymer mixtures prior to spinning into fibers.

The modified polypropylene fibers of the invention and -Yarns can be used to achieve the same high tenacity, low elongation values »and other excellent properties The fibers and yarns are drawn out from unmodified Have polypropylene · This is surprising because the polymers of acrylic and methacrylic esters ^ are essentially non-crystalline, inotixi when you look at them manufactures according to conventional methods, and therefore fibers with less Toughness, high shrinkage and no commercial value. Contrary to the facts, one should have expected

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lein that these products- if they are used to modify B®l3nP3 * OjpjrI ^ itaE »im raai -igaarmeaa wrraaaäefLwIiCTleai» Adversely affect properties

Biaa «more musrsartste Uatsaela» T it says read them

unfl-methacrylic acid ester is not Is .in

Weis® »about modifying polyolefin fibers in the general vensenüet weTäem köimexi. If you lsweise ibeiBpi "this β" J "oüifikation8ia" edium a ^ ewöhnliGhen or "i- mem PolyStJayl 'n ^ koibear Bleibte attaches, ο shows look" aase it thus in wesentlieiien nictot compatible sin4 "Yes and no," Ml "Tim 20 Teilceia P © ljfitJhyl »ia waä 10 part <eaa P ^ ^ llbt, for example, when pinning the clay

The etai *: to get along, if one pulls such! fibers, "yellows see" ine -ilhrlllation mad thus an "in " the product to be praised, all in the blessing to the

W , the ibeiia taking off no

Furthermore, it is surprising that the nitriles ü <& T ®τϊ iaaaica ^ ifgealsB -yerWeaafleteaa Acrylate 'imi JPolypropylenegamen und -faeern the usual iai © Sht weTljeiMmxi » iirtanagel -» © Modofifcationsmittel flrr

propylene fibers are, for example, poly-methylnitrile, polyacrylamide and polymethacrylamide

Sowing a preferred embodiment of the invention used are used as monomers for the polymerization according to the invention polymers suitable for mixing with polypropylene those of the general formula

CHg · 0 - * C - OE ₁ »

R.
in the

R is a hydrogen atom or a methyl group and

R _{1 is} an alkyl, Alkoayalkyl-, Cycloalkyl- * Aral-Ipyl- or Arylreat with preferably "up to 12 carbon atoms

mean.

The described monomer units can be in the form of a homopolymer or in the form of a copolymer of the acrylate or methacrylate in question with another aerylate or methacrylate or with a vinyl pyridine or N-substituted Acrylamide are present.

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Usable copolymers can consist of two or more different acrylate or methacrylate units or of at least one type of such units and at least one further type of vinylpyridine or N-substituted acrylamide units. Monomer units of the last-mentioned type are derived either from vinyl pyridines of the general formula

from, in the

H _{2 is} a lower altyl group with up to 4 carbon atoms and

η is an integer up to 4

mean and in which E has the meaning given above » or of !! - substituted acrylamides of the general formula

B, 0

I- ⁷ »

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* 11 -

¹ SL. di- taeeexvtof £ atoa or © in ©

Aliylgsappe ait -r © arasagswelse Hs * ΰ 4 XaaHi-

»« Ine AUkyl— ₉

ait «weeicBSssig Ms asu 18 Btoifatosieaa

2 «. a Vassei ^ toitfatoa or «r« in « practices for Betreclat

Suitable Hoaoaeres are e »B, s 2- ¥ imyl ~ pyi'iäiii (,

2 — Met ^ rl. — 5 — Ti ^ rI-KfI ¹ MIa * 2-4fetbyl— © --yimrl-pyridira., 2,4-

flie wtsoält isieremäeiB Polfjaerisat «geaSee aacli as Poljrnerisate with w! & ä <eTl £ <BfoT®wäm®. Wksuaml-

teaä des f olgeraiea allgeaeiiieaa liaf tonas def imiert

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a - OH ₂ - β -

σ - or

wherein R and R _{1 have} the meanings given above and

Z the bed of an unsaturated polymer insulating

vinylpyridins or N-substituted ones Acrylamid8, as stated above, as well as

ζ and y integers

mean such that the homo- or mixed polymer shown has a molecular weight of at least 1000 « It is on the tape that the nature of the unsaturated iei polymerizable vinyl pyridines or N-substituted acrylamides can be modified within wide limits · That really What is clear about the modifier is that the acrylate or Sethacrylate units of the type indicated above therein are contained twice in proportions of 50 to 100 moles

The radical «· R ₁ , which can be contained in the ester group of the monomeric acrylate or methacrylate, can be modified in a wide range and include, for example,» methyl, ethyl,

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$ - $ ropyl-, Ieopropyl-, η-butyl-, isobutyl-, tert-butyl-, 2-ethylhexyl-, Konyl-, lauryl-, dodecyl-, cyclopentyl-, cyclofheptyl-, cyclohexyl-, trimethyl-eyelohexyl -, benzyl, phenylhexyl * _t phenyl, trimethylphenyl, diphenyl, methoxyethyl, ethoxybutyl, methoxylauryl and ethoxyethyl groups.

The aorylate and methacrylate units can also have less than 50 mol ^, ϊβίβρίβίβνβΐβ ·. 40, 30, 20 or even just make up f $ 10 moles of the modifixing polymer, but 50 to 100 mole percentages are particularly preferred when good dye affinity for dispersed dyes is desired.

It has been shown that blends of crystalline polypropylene with the polymeric modifying agents described above can be used in the melt-pinning process to produce yarns with high strength that can be spun with dispersing and metal atom-containing dyes too let deep light- and gas-fast color tones dye »Das Dyeing can be used according to the usual methods, with or without a dye carrier. Herd * The polypropylene mixtures kp * annen from less than 1 to more than 25 weight percent dee Modifying Hoao or Miechpolymeriaate contain »where-

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-'14 -

but if you prefer concentrations of the modifier τοη 5 to 15 i. On the other hand, however, there are special cases in which the use of 30 or perhaps even 40 percent by weight, based on the mixture, of certain of the above-mentioned modifying copolymers is desirable polymers the fibers verleibt a Färbstoffaffinitat, considering the application of at least 5 1 before, especially when deep color # tones are desired · polypropylene mixtures * of this type can operate at temperatures of 25 to 60 ° C below that for the Sehmelz? spinning process be spun, which are required to spin pure polypropylene in this way.

Some specific examples of the invention follow usable modifying polymers *

Poly (methyl ~ methaerylate)
Poly (ethyl methacrylate)
Poly (isopropyl methacrylate)
Poly (n-propyl methacrylate)
Poly (n-butyl methaorylate)
Poly (isobutyl methaerylate)
Poly (tert-butyl methaorylate)
Poly (n-hexyl methacrylate)

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Poly (lauryl metheorylate) Poly (cyelohexyl methacrylate) Poly (beneyl-aethaerylate) Poly (phenyl methacrylate) Poly (methyl aerylate) Poly (n-propyl acrylate) Poly (n-butyl aerylate)

Poly 2-methoxy (ethyl) acrylate poly 2-ethoxy (ethyl) acrylate Poly 2-ethyl (hexyl) acrylate

Methyl-acetylate-ethyl-methaerylate-mixed polymerizate (751 2 \ Ethyl-aeryia t-H-tert. Butyl acrylamide SÜL ε copolymer! -

eat (20t80)

Methyl methyl etherylate HjH dimethylacrylamide mixed polyacrylate (25 »T5)

Ethyl methacrylate 2-methyl-5-vinyl ~ pyriäine copolymer (50 * 30)

ithyl acrylate-2-methylene 1-6 - T iiij 3L-pyride In-Mi a chpolymerisat (75-25)

2-tynyl-pyridine-ethyl-acrylate-M | ciisolpB8rie & t (5Oi50) Methy 1-methacrylate 3-Isopropjyenyl-pyriöin / (50t50)

", R-Diaethylacrylamiä-K-lBopropenyl-AcrylmthaltTerpolrit \ 6O30" 1 Q)

amide-methyl-methacrylate-terpolymerate \ 6Oi30 «1 Q)

Note The numbers in the above list as well as in the following description refer to the percentage mole fraction of the various components of copolymers

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Blends of crystalline polypropylene with one or more of the polymeric modifiers can be made in any manner, be it by mechanical mixing, coprecipitation, or some other mixing method, for example by orphans at elevated temperatures in a Banbury heater or other suitable Processing device or by the ifehrfaohauspreesverfahren. The polymeric modifiers can have molecular weights of 1,000 and above, depending on the properties required for the mixture in question and according to the mixing process used. It goes without saying that any modifying polymers with molecular weights of more than 1,000, dfe * the introduction of the stated percentages by weight, based on polypropylene, of the acrylate or methacrylate units described in the mixture «, While xtidtfcx fall within the scope of the invention.

Usually one sees it before, the modified polypropylene blends of polypropylene with a normal density of over 0.900 and a basic viscosity in * tetralin at 145 ° C from 0.9 to 1.2 to be produced »Using the expression" normal density " I am referring to a duty that was determined on a sample to achieve maximum crystallinity has been annealed. A common tempering process

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in placing the sample in a tube * and under high vacuum or in a nitrogen atmosphere to just below To heat the softening point and then let the sample cool down slowly, polypropylene with basic viscosities above 1,2 can also be used to prepare the modified mixtures, but it is then usually necessary to thermally reduce these mixtures to a lower Reduce viscosity in order to achieve optimum melt spinning and fiber processing · » to achieve gensobaften. The temperatures required for such degradation are usually above 300 ° C and often lead to a significant loss of modifier through depolymerization. Polypropylene with basic viscosities below 0.9 can also be used to produce modified mixtures for melt spinning, however, do not lead to fibers with optimal physical properties

The modified polypropylene blends in question can be converted into fibers with the desired properties Spinning process., For example melt spinning, dry » spinning, wet spinning or pressing through a suitable nozzle, be spun "You can make different cross-sections" like "" clover-shaped * Y-shaped etc ^ by means of a spinning device

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lines or nozzles are formed which have suitable openings.

example 1

Prepare several blends of crystalline polypropylene (Basic viscosity! Tat «1, Oj density * 0.912) and roly- (methyl-methacrylate) by mechanical mixing of pastilles of the two polymer products followed by one Pressing out as a melt and again converting the resulting mixtures into lozenge form. These mixes then melt spun into 34 fiber yarns having those shown in the table below Properties spun. Knitted tubes made from these yarns can all be made by means of 4- (4 * ~ ß-hydroxyethyl-anilino-) 5-nitro-1,8-dihyöroxy-antra-

* ■) ■ "
Quinone and isolane red B, a neutral coloring. Metallatoiae-containing dye, can be colored in aqueous dye baths by boiling for one hour to deep shades. Higher, lower notes are obtained when using carriers such as benzyl-n-butyrate _t . All samples show excellent resistance to ultraviolet light when treated in a padeometer for 20 hours.

*) Color Index, Volume 4 (1956), p. 4326. ORIGINAL INSFEGTED

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Characteristic value

Percentage ratio of polypropylene to poly- (me thy I-

methacrylate)

10OtO

95 * 5

90:10

85 t 15

80t20

Yarn viscosity 0.93 0.97 0.91 0.85 0.89 Total denier 223 196 164 153 162 Toughness in grams
per denier 7.33 5.23 7.25 6.80 7.25 Elongation in $ 18th 28 17th 18th 14th modulus of elasticity
in grams per denier 63 62 71 59 79

Example 2

Although the methyl esters of acrylic acid and methacrylic acid are preferably used, the other alkyl esters, such as defined above, can be used with excellent results. For example, a mixture of 9 parts of crystalline polypropylene (basic viscosity 1.05; density 0.914) and one is prepared Part of poly (n-butyl methacrylate) by evaporation of a toluene Solution of the last-mentioned component in the presence of lozenges of the polypropylene in a conical mixer under vacuum. The solvent-free mixture is then transferred to a rod about 3.2 mm thick Melt-pressed as well as cut pastilles with a length of about 3.2 mm. The mixture obtained is easily

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procedure to spun a yarn with 34 fibers at a spinning temperature of 230 ° C (the unmodified polypropylene would require a melt spinning temperature of 280 ° 0 to achieve optimal spinning properties).

tene yarn of modified polypropylene is shown below knit a "Sockeif or hose used for the dyeing tests' is te · An excellent dye affinity for dispersible \ and dyes containing metal atoms is evidenced by the deep hues that one with Ieolanrot B and the following dyes can achieve 4-anilino-5-nitro-bensol ettlfonamid, 4- (4'-methyl-2'-nitro-bensol -) - 3-methyl-5-pyroaso lia _# 4- £ 4 '- (bensolaso-) - benzenes so j -phenol, 1 »-Aaiae-4- \ hydrcxy-f-phenoxy-enthraquinone, 4 -> (4 ^t -Hltrobensolaso -) - K-ethyl-HS-hydroxyethyl-aniline» 1-methylamino-4-ß -aethyläthylamino-anthraohinon, 4- (4 * -ß-Hydroxyäthylanilino -) - 5-nitro-1,8-dihydroxy-anthraquinone

Other polymeric modifiers that if you stick to them 3 parts of the poly (n-butyl methacrylate) used «similar Provide results are poly (ethyl methacrylate), poly (ethyl eorylate), poly (cisobutyl ethacrylate), poly (2-ethyl hexyl acrylate), poly (clauryl methacrylate) and poly- ' (2-methoxy-ethyl-acrylate)

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ι * tu yj u υ

Example 3

Usually the modifier used is acrylate and methacrylate homopolymers, but are also copolymers Suitable in the specified quantities and proportions.! You work analogously to example 2 with the exception »

that the poly-Cn-butyl methaerylate) by «in 50t5θα

Copolymer replaced by n-Butjtl- and isobutyl methacrylate * Bas yarn obtained has a tenacity of 5 »g per denier 2" has an elongation of 27 f and a Elastizitatsmo-

OK
dul of 40 g per denier · Strijqpschläuche from this yarn can be dyed with 4 - »(4 ^l -β-hydroxyethyl-anilino-75-nitro-1 _f 8-dibydroxy-anthraquinone and xsolan red B to deep shades» if you in aqueous dye baths cooking a hour * a sample unmodiflzierten polypropylene in the form of a Strickschlauobes shows comparatively little or no tendency _t these dyes aufüunehnen · If a carrier is used "may be the unmodified yarn to pale shades bit bad Echthelteeigenschaft and with clear distinction of the actual color dye modified yarn dyed against corresponding samples.

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<·> 22 -

Ee follow examples of other copolymers, if it instead of the n-butyl methacrylate isobutyl methylerylate copolymer used, lead to similar results! 75i25 copolymer made from methyl aorylate and Ethyl metheorylate; SOiSO mixed polymer aue methyl and

m
n-butyl methacrylate; 80: 20 ~ copolymer of methyl methaorylate and ethyl aerylate; 60ι ^ copolymer of methyl methaerylate and cyelohexyl methaerylate »In these cases, the amount of the modifier is chosen so that an effective concentration of 1 to 25 % of the acrylate or methacrylate in question, based on the polypropylene, is achieved ·

Example 4

A mixture of 9 files crystalline polypropylene is produced (Basic viscosity 1.05ϊ density 0.914) and one

Part of a 50:50 S / lischpolymerisat8 made of methyl methacrylate and 3-isopropenyl-pyridine by adding a solution of the the latter component in toluene in the presence of lozenges of polypropylene in a conical mixer under vacuum evaporates. The solvent-free mixture is then melt-pressed into rods about 5.2 mm thick and into lozenges cut to a length of about 3.2 mm. The other

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Filing · Missing is easy to use in the melt-spinning process »drive yarn old 34 threads at spinning temples« spinning doors of around 265 ° C »(The unmodified polypropylene requires a low temperature of 280 ° C _9, among other things, optimizing the splint properties”) AodiflEiertea polypropylene - is knitted into a sock or hose * which is used for dyeing experiments »£ · the result is an excellent dye affinity for dispersed, metal atoms containing and acidic dyes» as the deep tones prove * the »an by means of leolan red B * aittela des blue dye Color Index Ko * 833 and old * tele 4 ~ (4 * -ß-Hydroxyäthyl-enilino-) 5-nltro41, e-dihyÄroxyanthraquinone achieved.

Similar results are obtained if instead of the mentioned 50: 5Q misoh polymer from methyl methacrylate and 3-isopropenyl pyridine, a 60/30/10 terpolymer from 1 x 2-, methyl-1-vinylpyridine ^ 3 * vinylpyridine and n-butyl-ethf / - _m erylat used *

Example 5

Han works analogously to example $ with the difference “that you can use the 50:50 mixed polymer from methyl methacrylate and

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3-Ieopropenyl-pyridine by a t5 * 25-Misclipolyaerieet. Ethyl acrylate and 2-3iethyl-6-vinylpyridine replaced · Construction accruing yarn shows a tenacity of 7.0 g per denier, an elongation of 2Qf and a modulus of elasticity of 31% per denier »-S-Hydrosyäthylanilino - ^ - nitro-i, 8-dihydroxy-anthraquinone and with the help of the blue woolly toffee Color Index Bo. 833 deep shades of color when boiled for an hour in aqueous dye baths * A sample of the unaodified polypropylene in the form of a knitted tube shows comparatively little or no tendency to accept "this" dyes. If you use a carrier, do it Dye unmodified yarn to pale shades with poor fastness properties »which show marked differences in color compared to corresponding ψ samples of dyed modified yarn ·

Similar results are obtained if one replaces the 75 »25 miscopolymers of ethyl acrylate and 2-metaphylpyride ^ in a SOiSO-Miscßpolymerisat from 2-yissyl- and xethyl acrylate used

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Example 6

Men makes blends of τοη crystalline polypropylene a 5015O * "Miechpolymerisat au" methyl methacrylate and 2-methyl-5-vinyl-pyridine by Sohmels pressing mechanical Mixtures of the two hares * The mixtures are then spun in the Schaelz pinning process on yarns with 34 fibers "which have the following properties"

Characteristic value. Prosenter ratio polypropylene see below

modifying misoh polymeric acid

92i8 83i17 75 * 25

Garnylskosltät 0.86 0.89 0.85 Total denier 152 162 184 Tenacity in Graaa
per denier 7.24 7 * 25 6.82 Elongation in percent 15th 14th 51 Elasticity module in
Grams per denier 81 79 60

■ Knitted tubes made from these yarns can be borrows

anthreohinon, with the blue wool dye Color Index No. 83S

■ *) ■ ". 1

and dye with DuPont-Milling Bed SWG · You get without 1

further deep tones with good light and fastness *,

9098 1 2 / Ö97 1 Color Index No. 430

Example 7

Several mixtures of crystalline polypropylene (basic viscosity 1.0; grade 0.912) and a 20 * 80 copolymer of ethyl acrylate and N-tert-butyl acrylate are produced by mechanically mixing grains of the two polymer materials and then pressing them in the form of a melt and the mixtures formed again in lozenge form transferred · These mixtures are then spun into yarns with 34 fibers using the melt pinning process · Knitted tubes made from these yarns can be calibrated

Anthraquinone and with Isolan Red B, dye to deep shades by boiling in aqueous dye baths for one hour. Bas knitted fabric can also be dyed well with the blue wool dye Color Index 833 and rait BuPont Milling Eed SWS under similar conditions. »Even deeper tones are achieved when using a carrier such as benayl-n-butyrate · All samples show excellent resistance to ultraviolet rays Light at 2 * xi * ia * ignrxts ** Mii ** g 20etUndiger treatment in a fadeometer · A sample of the unoodified polypropylene "shows a comparatively little tendency to absorb these dyes", --X ^ f * ^

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~ 27 -

Example β

Prepare a mixture of 9 parts of crystalline polypropylene (intrinsic viscosity 1.05 "; density 0.914) and a part of a terpolymer of 50r30t20-S, li-l) · imethylacryl amide, H-isopropyl-acrylamide and Metbyl-niethacrylat lier _f by Grains of the two polymers are mechanically mixed. The mechanical mixture is then melt-pressed to about 3.2 mm thick rods and cut into lozenges with a length of about 3.2 mm spinning, at a spinning temperature of 265 ^ C (the unmodified polypropylene requires a melt spinning temperature of 280 ° C to achieve optimal spinning properties). The yarn made of modified polypropylene is knitted into a sock or a tube, which is 4- (4 * - ß-Hydroxyätbylanilino-) 5 ~ nitro ~ 1,8-dihydroxy-anthraquinone and can be colored with Isolanrot B by boiling for one hour in an aqueous dye bath to give deep ions st. A sample of the unmodified polypropylene in the form of a knitted tube shows comparatively little or no tendency to absorb these dyes. “If you use a carrier, the unmodified yarn turns out to be poorer in pale shades

90 9 812/0971

Color fastness properties that give a pronounced Color difference compared with corresponding samples dyed «, show modified yarn.

Example 9

Mixtures of crystalline polypropylene are used a 25i75 mixed polymer from methyl methacrylate uM fttH-Diaethylaorylamid "by pressing a mechanical mixture of the two resins as a melt" These mixtures are then melt-spun into yarns with 34 fibers, which have the inferred properties *

Characteristic percentage ratio of polypropylene mn Mixed polymer

97 * 3 82 * 18 75 * 25

Basic viscosity
of the yarn 1.01 0.93 0 «85 Total denier 148 178 176 Toughness In grams
per renovation 8 _t 55 6.97 6.74 Elongation in Proeent 16 20th 23 modulus of elasticity
In grams per denier 102 71 62

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Strlcksohläuche bus these yarns can easily be made with 4- (4 · -β-Hydroxyäthylan! Lino-) 5-nitro-1,8-dibydrocyanthraquinone and dispersed with Isolanrot B as well as with other or- dyeing dyes containing metal atoms Directly concerned. It is easy to see deep tones, the light- and are really good.

According to the invention, therefore, yarns and fibers are based on is made of the essential crystalline polypropylene improved paraffin affinity, excellent light and show gas closeness as well as increased stability. The polypropylene fibers improved according to the invention can be used in use the same way as conventional derived propylene fibers

for * For example, you can use / wool-like »blankets, for Manufacture of covers for car seats or for rope ropes that are almost as strong as nylon, in doing so but a little cheaper ^ are "The foregoing was the invention To form “hand of preferred execution” in one on IsbUuu described, but it goes without saying that modifications within the scope of the disclosed inventive concept are included.

• 30 -

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Claims (1)

Patent claims 1) fiber based on polypropylene, characterized by "inen content of a homopolymer, dae aua units of the general structure R.
I -CH ₂ -C- C-OE ₁ 0
is constructed, with R is a hydrogen atom or a methyl group and R _{1 is} an alkyl, alkoxyalkyl, cycloalkyl, aralkyl or aryl group with up to 12 carbon atoms mean, or on a copolymer which, in addition to the structural units according to I, contains at least one further type of structural units, namely * further types of structural units falling under the general formula X;
Vinyl pyridine units of the general structure 909812/0971 where R has the meaning given above and where a lower alkyl group and η a whole number up to 4 mean; and or N-substituted acrylamide units of the general structure mean· H ₃ 0 f M a water atom or a low " Alkyl group, j is an alkyl, cycloalkyl, aralkyl or aryl group with up to 18 carbon atoms and a hydrogen atom or one of the for Rj eligible groups 9 0 9812/0971 "Faser near Aneprueh 1" is identified by a de * ^ ^ hold en found one of the medlfizing Homo "and meohpolyserleate defined in Aneprueh f in eoleher senge * that a reservation ves about 1 they 25 § fail-" W / <WeSjie von About 5 oils 15, eevlohteprosent * are added to the polypropylene, and Forsel I yields to ßtruktureinhelten seeds. 5 · feeer neek aneprSflben 1 every 2 »geicennseieanet their of a Sennit to Mindeetene one of the following eetet Foly - («« 4hyl-eetb6oryl «t), PeIy- (ben "7l-HMtheerjrl" t) Kttttoteteffsieohnng euf Felyprogylenbaelet gekennselon · net dttroh a tolohsn eebelt * a sindeetene a hese "or HleohpelynerieBt containing Xinbelten 4§r • llgeseisen Btmictmr I _9, the fuel Elten dnee Z 1 Ui 25 Qevidlteyrvtenty becogen nnf In polypropylene, * Ke * mefcen _v eevie is lalle by Mieehpoljserieaten nmeeeries tesd n) further · types of lisaeiten gestse Ii ») Linneites der * ll« tneines «tniktnr XZf . «Nd / eder e) suffered the «Ugeseines Strektsr 1ZZ · 809612/0971