DE1404480A1 - Process for improving a substantially amorphous film of linear polyterephthalic acid esters - Google Patents

Description

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Delaware (TJ. £ i. A.)

Process for the improvement of an essentially amorphous film made of linear pol? Rl; erephthalic acid esters »

(Addition to patent ₀ ο _o (patent application P 19 Q5o 2/39 a)

In main patent "," "" (patent application P 19 85o X / 59 a) is a process for improving an essentially amorphous Mlms from linear polytereplitlialic acid esters, in particular e p oly t ei * ephtl.ialic acid e ~ gly oles, be very much, at which nan den l ^ iln at temperatures between about 8o and 12o in an axis i'ichtuiic around de.s 1,5- to 3,0-xaehe the original dimensions and in the transverse direction cTxizu by d £: s 3f7 to 5> · ο — times the original dimensions -stretch, in front of you at Eßerryeraturen zv / ischen 15o and 2oo ° under sufficient tension ma, eht.

The ΙΊίΐιβ produced by this process have tensile strengths of at least 2 1oo kg / em in the .Direction the amplified Ausreckens, and a modulus of elasticity of at least 49 thousand kg / cm "The elongation at break is in the same Heeinrichtung at most 5o $ _a case of tuning of the process to Particularly dual-class embodiments can be produced with a tensile strength of 42oo kg / cm ² and a modulus of elasticity of 91,000 kg / cm ² , both measured in one seal,

A special embodiment of this procedure

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becomes an essentially amorphous lilac made from polyterephthalic acid glycol ester at 80 to 100 ° stretched by about four times in a seal and then with the same ^ temperature in the transverse direction stretched to 1.6 times. In this embodiment one holds the IPiIm while stretching in the second direction, expedient under tension in the first axis direction, around a shrinkage to avoid one also under tension to avoid shrinkage liält

It vraz.-de found that this method of manufacture an essentially amorphous film made from linear polyterephthalic acid glycol esters, in particular from polyterephthalic acid glycol esters, m.ch patent. ·. · * (Patent application P 19 85o 2/39 a) can still be improved, γ / emi ιιε.η the film In the case of tempera doors from 80 to 180, initially in one axis direction the I film level -Uli more than 3, o-fold and no more than 4.0 times the original 11 dimensions and then in the transverse direction around the blind st ens etv / a stretching 3.7 times and at most about 6.0 times in such a way that that at the end of the stern process between the dimensions of the Stretching in the individual axial directions a difference of at least 1, o is present, which can be seen under tension at Temperatures between 15o and 24o ° make it dimensionally stable

ils has proven particularly useful to use an amorphous film made of poly · » terephthalic acid glycol ester initially in a transverse direction to its longitudinal or working direction running direction at 80 to To stretch 9o °, then to make it partially rigid at 90 to 13o ° and then in the second axis direction to stretch 4 to 6 times at 12o to 18o °, whereby mem stretches in such a way that at the end of the Itejck processes between

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the extent of the stretching in the individual axial directions is a difference of at least 1, ο there is » The JFiIm stretched in both directions will then be at Temperatures from 15o to 21o made dimensionally stable under tension ».

The PiIm obtained after this improved working method shows in comparison with the films according to the process of the main patent · · * · (patent application P 19 85o X / 39 a) Pilmen produced improved physical properties measured in one direction of the film plane * There was also an increased tensile strength in both Axially aligned, measured, ascertained

The physical properties given in the table were determined on the basis of the measuring methods described in the main patent Take out the film, which is rolled out at 1oo rfo per minute »'

The following example illustrates the Erfindungt example t

A 1.90 to 2.05 mm thick film of polyterephthalic acid oleol ester was stretched at 85 ° in the axis direction running transversely to the longitudinal and working direction of the film plane around 3 »3-ache of the original dimension, then heated to 90 ° and then in which was stretched 5 times at 137 »Finally v / was made dimensionally stable at 183 ° » The now 14 micron thick film had the following physical properties:

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Toughness (kg / cm) modulus of elasticity (kg / cm)

■ Longitudinal direction Transverse direction \ 2653 1218 5824ο 25o8 © 13.8 89.5 g) 1o, 4 7, o> not measurable * 7.7

5

Dimensional stability at 15ο (specified in $ shrinkage)

Tensile strength

1o * With the device used to measure the tensile strength, it was not possible to determine a fourth because the film was too tear-resistant for this device *

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Claims (1)

Pafrentanaprü o Ii Jg. Yerfahren to improve an essentially Amorphous films made from linear polyterephthalic acid esters, in particular from polyterephthalic acid glycol esters, according to patent _o «. _β (patent application P 19 85o X / 39 a), characterized in that the S ¹ um at temperatures of up to 18o ° in an axial direction of the plane of the film. more than 3.0 times and at most 4.0 times the original dimensions and in the transverse direction by at least about 3.7 times and at most about 6.0 times in such a way that the end eic β There is a difference of at least l, o between the extent of the rectification in the individual axial directions, whereupon under tension at i'eiapperatures between 15o and 24-o ° it is dimensionally stable » 2 "Method according to Claim 1, characterized in that it is that one speaks in the first direction of the axis at 8o to 9o ° « 3 · The method according to claim 1 to 2, characterized in that in the second axis direction bbi 12o to '! 8o ° recktο 4. The method according to claim 1 to 3, characterized in that that one the i? ilm stretched in the first axial direction before stretching in the second direction at 9o to 13o ° partly foraifost makes, 5, Verfaliren according to claim 1 to 4, characterized in that that the second axis direction of the longitudinal and working direction corresponds to the ffilm level 8098 10/1130