DE1164644B - Use of unstretched structures, in particular films or threads made of high molecular weight, linear polycarbonates for producing similar stretched structures - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Boarding school Class: B 29 d

German class: 39 a3 - 7/24

Number:
File number:
Registration date:
Display day:

1164 644
F 28324 XV 39 a3
April 25, 1959
March 5, 1964

It is known that structures such as films or threads are made of stretchable, high molecular weight, linear Polycarbonates, especially those based on di- (monohydroxy-aryl) alkanes, sulfones, sulfoxides, sulfides or ethers or mixtures of these dihydroxy compounds with one another or with other aromatic, aliphatic or cycloaliphatic dihydroxy compounds Stretching can orientate and that certain properties of the stretched structure, such as tensile strength, Impact resistance, solvent resistance and aging resistance, are much better than those of the undrawn starting material. Such stretched structures show in the X-ray examination a more or less sharp fiber diagram, with optimal properties in such Forms can be found that show a particularly sharp fiber diagram.

On the other hand, it is known to produce undrawn structures made of the polycarbonates mentioned from solutions to produce their solvents from less good, namely poorly volatile solvents and in particular from solvent mixtures that are less good solvents and / or nonsolvents for the particular product to be processed Polycarbonate, especially low volatility, contain exist.

It has now been found that stretched structures, especially films or threads, made of high molecular weight, linear polycarbonates with particularly sharp fiber diagrams and with particularly good ones Properties are obtained when the unstretched structures of the same type are used to produce the stretched structures Structures used, which in a manner known per se from solutions using solvent mixtures, those that, besides good solvers, are less good solvers and / or nonsolvents for the polycarbonate contain, are produced and their crystallization

j- _{T /} r ,, crystalline amorphous, _n

degree of an index - = - - = - · 10 of min-interference width

corresponds to at least 1.67.

While unstretched structures made of the polycarbonates mentioned, which are made from solutions with good dissolving, volatile solvents, such as methylene chloride, are usually clear, a degree of crystallization, that of a key figure

crystalline amorphous _{Λ n} ,, _. . ,.

- · 10 corresponds to about 1.60, on-interference width ^

show and after stretching only diffuse rings and no optimal property improvements ze ^; -gen, one obtains from the above-mentioned polycarbonate solutions mostly more or less cloudy structures, the crystallization index between about 1.67 use of undrawn structures,
in particular films or threads
high molecular weight, linear polycarbonates for
Manufacture of similar stretched
Formed

Applicant:

Paint factories Bayer Aktiengesellschaft,

Leverkusen

Named as inventor:
Dr. Ludwig Bottenbruch, Krefeld-Bockum,
Dr. Hermann Schnell, Krefeld-Uerdingen,
Dr. Arthur Prietzschk, Dormagen

and 2.1 and which, as already stated above, show particularly sharp fiber diagrams and particularly large improvements in properties after stretching.
Soluble, crystallizing, high molecular weight, linear polycarbonates of the most varied types are suitable as starting materials for the present process, among which the following may be mentioned in particular: 2,2- (4,4'-dihydroxydiphenyl) propane, 2,2- (4,4'-dihydroxy-3,3 ', 5,5'-tetrachlorodiphenyl) propane, 2,2- (4,4'-dihydroxy-3,3'-dichlorodiphenyl) propane and 2.2 - (4,4'-Dihydroxydiphenyl) -butane polycarbonate or mixed polycarbonates of 2,2- (4,4'-dihydroxydiphenyl) propane and 0.5 to 10 mol percent of another dihydroxydiarylalkane and / or another aromatic, aliphatic or cycloaliphatic dihydroxy compound, such as 4,4'-dihydroxydiphenylmethane, 1,1 - (4,4'-dihydroxydiphenyl) cyclohexane, 1,1 - (4,4'-dihydroxydiphenyl) ethane, 4,4'-dihydroxydiphenyl sulfone, 4,4'- Dihydroxydiphenyl ether, 4,4'-dihydroxydiphenyl, 2,6-dihydroxynaphthalene, hydroquinone, resorcinol, 1,6-hexanediol, 1,4-cyclohexanediol, p-xylylene glycol and 2,2- (4,4'-dihydroxyethoxydiphenyl) propane, finally I mixed polycarbonates of 4,4'-dihydroxydiphenylmethane and other dihydroxydiarylalkanes and / or other aromatic, aliphatic or cycloaliphatic dihydroxy compounds such as those mentioned above in a wide range of mixtures.

example

The values summarized in the table below were measured on films of 20 ^en% ig

409 537/530

Solutions 1.68 (measured in 0.5% strength solution in methylene chloride at 2O ⁰ C) in the indicated solvents under the same for each foil a polycarbonate from 2,2- (4,4'-dihydroxydiphenyl) propane in the relative viscosity Casting and drying conditions were obtained.

Tabel

solvent

relationship

^: n

Weight percent film

Appearance

apparent
Absorbance *)

Code **) crystalline amorphous interference width

10

a) methylene chloride

b) methylene chloride-benzene

c) methylene chloride-carbon tetrachloride

d) methylene chloride-methyl propyl ketone

e) methylene chloride — di-n-butyl ether.

f) methylene chloride-benzene-di-n-butyl ether

80:20

77: 95: 94:

23 5 6

90: 5:

clear
little cloudy

cloudy

little cloudy
cloudy

cloudy

0.06
0.08

0.43
0.07
2.5

0.17 1.23

1.61 1.97

2.09 1.67 2.15

2.01

*) Measured with a filter with a maximum permeability at a wavelength of 445 m / i. **) A. P riet ζ schk, Kolloid-Zeitschrift, 150 (1958), p. 8.

After stretching to five times the length (stretching temperature 185-190 ⁰ C), the films bseitzen the properties indicated in the Table 2 below.

Table 2

Film after
Table 1 Roentgen-
Fiber diagram Tear resistance
kg / cm ² a) diffuse rings 1200 b) spicy 2800 c) spicy 3000 d) spicy 2700 e) spicy 3200 f) spicy 3000

30th

35

Claims (1)

Claim: ' Use of undrawn structures, in particular films or threads, made of high molecular weight, linear polycarbonates for the production of similar stretched structures, the undrawn structure in a manner known per se from solutions using solvent mixtures, the solvents and / or nonsolvents for the polycarbonate that are less good in addition to good solvents contain, are produced and their critical , ". .. j. _v ,, crystalline, amorphous _in Stalhsation degree of a key figure ₁ - _i _ _s __ _i _ _s -. 10 of at least 1.67. Interference width Documents considered: German Patent No. 971 791; Book by G η a m m, "The solvents and plasticizers" Scientific publishing company Stuttgart, 1950, pp. 23 and 24; "Kunststoffe" magazine, 1959, p. 8; British Plastics magazine, March 1958, p. 114. 409 537/530 2.64 © Bundesdruckerei Berlin