DE1188279B - Improvement of the toughness of polypropylene - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

C08f

German class: 39 b -22/06

Number: 1188 279

File number: F39838IVc / 39b

Filing date: May 25, 1963

Opening day: March 4, 1965

Various methods have heretofore been proposed to increase the toughness of polypropylene To improve additives. However, the various additives have always had a disadvantage so far, be it a decrease in hardness, limit bending stress and torsional modulus, be it an increase the viscosity of the melt and thus a deterioration in processability.

The invention relates to the use of 0.0005 to 0.005 percent by weight of the y-phase linear quinacridones of the formula

N
H

C O

Improving the toughness of polypropylene

Applicant:

Farbwerke Hoechst Aktiengesellschaft

formerly Master Lucius & Brüning,

Frankfurt / M.

Named as inventor:

Dr. Günther Döring, Hofheim (Taunus);

Heinz Schmidt, Kelkheim (Taunus)

to improve the toughness of polypropylene or a blend of polypropylene with a Copolymer of 30 to 70 percent by weight of ethylene and 70 to 30 percent by weight of propylene and / or butylene- (I), the mixture containing up to 20 percent by weight of the copolymer.

The effectiveness of the y-phase of the linear quinacridone is extremely high. Even with an addition of 0.0005%, there is an increase in toughness by about 30%. ^Amounts of more than 0.005% give no further improvements.

It is known to add quinacridone to plastics as a dye. In order to achieve a coloration, must but a much higher percentage can be added. So, even for pastel shades, at least 0.01% required. In contrast, the additive used according to the invention is so small that at most a very faint red tint appears, which can be compensated for without further ado, so that all light color tones also appear can be obtained. Due to the inherent color of the additional substance, as a result of the minimal required amount does not restrict the general applicability.

^ The κ- and / S-phase of the linear quinacridone also have a certain effectiveness, especially the hardness of z. B. slightly increased polypropylene, but the improvement in impact strength is much less than when using the y-phase (see. Example 2). The individual phases are differentiated from one another by X-ray diffraction recordings.

example 1

A polypropylene powder (RSV = 3.5 dl / g, i _s = 5.5 g / 10 minutes, density = 0.906 g / cm ³ ) was mixed with the amounts of y-quinacridone indicated in Table 1 in a high-speed laboratory mixer. The powder was processed into pressed plates at 200 ⁰ C and test specimens found ausgeschnitten.Die mechanical properties are given in Table 1 below.

Table 1

Notched impact strength Melt index f ₅ Ball indentation hardness 60 seconds 795 Limit Torsional modulus additive DIN 53453 ASTMD1238-52T DIN 57302 790 bending stress
DIN 53452 ASTM y-quinacridone V-notch
ASTM D 256-56 5 kg load
230 ⁰ C kg / cm ² 850 790 kg / cm ² D 1043-51
120 ⁰ C Weight percent kgcm / cm ² g / 10 minutes 10 seconds 845; 780 550 kg / cm ² 6.3 11.6 845 860 530 410 0.001 9.2 11.5 525 420 0.002 9.4 11.5 515 400 0.005 10.2 11.0 440 509 517/502

Example 2

A polypropylene powder (RSV = 3.8 dl / g, i ₅ = 4.1 g / 10 minutes, density = 0.905 g / cm ³ ) was, as indicated in Example 1, mixed with different amounts of quinacridone and pressed to form test specimens. As a comparison, two mixtures with a quinacridone of the «- and /? - phase were also prepared. The values found are shown in Table 2.

Table 2

Notched impact strength Impact strength 53453
-20 ⁰ C 17th Ball indentation hardness 60 seconds Limit Torsional modulus additive
y-quinacridone DEM 53453
V-notch
ASTM D 256-56 DIN
0 ⁰ C kgcm / cm ² - DIN 57302
kg / cm ² 715 bending stress
DIN 53452 ASTM
D1043-51
120 ⁰ C Weight percent kgcm / cm ² 29 22nd 10 seconds 720 kg / cm ² kg / cm * 6.5 - 26th 770 730 530 403 0.0005 8.6 45 20th 795 725 540 420 0.001 9.4 48 13th 785 725 555 400 0.002 9.3 49 12th 785 750 - 409 0.005 9.2 29 785 740 - 420 0.005 * 7.1 30th 805 - 440 0.005 ** 6.8 795 - 440

α-phase. 0 phase.

Example 3

90 parts of a polypropylene powder (RSV = 4.2 dl / g, J ₅ = 2.7 g / 10 minutes, density = 0.905 g / cm ^s ) and 10 parts of an ethylene-propylene copolymer with a propylene content of 53 percent by weight (RSV = 4.4 dl / g, I ₁₅ = 3.3 g / 10 minutes, density 0.853 g / cm ³ ), the amounts of y-quinacridone given in the table were added in a high-speed laboratory mixer. The mixtures were granulated twice on an extruder with a screw diameter of 30 mm. The granules were processed at 200 ⁰ C to press platens and excised specimen.

Table 3

additive y-quinacridone

Weight percent Notched impact strength

DIN 53453

V-notch

ASTM D 256-56

kg / cm ¹

Melt index / _t

ASTMD1238-52T

5 kg load

230 ⁰ C granulate

g / 10 minutes

Ball indentation hardness

DIN 57302

kg / cm ²

Seconds I 60 seconds

Limit bending stress
DIN 53452

kg / cm ²

Torsional modulus

ASTM

D1043-51

120 ⁰ C

kg / cm *

0.001

13.9
26.8

Example 4

5.2
5.0

90 parts of a polypropylene powder (RSV = 3.5 dl / g, h = ⁶ »7 g / 10 minutes, density = 0.905 g / cm ⁸ ) and 10 parts of an ethylene-propylene-butylene copolymer with a propylene content of 39 percent by weight and a butylene content of 9 percent by weight (RSV = 3.7 dl / g, density = 0.852 g / cm ³ ) was mixed with the amounts of γ-quinacridone indicated in Table 4 in a high-speed laboratory mixer. The mixtures were granulated twice on an extruder with a screw diameter of 30 mm. The granules were processed at 200 ⁰ C to press platens and excised specimen.

Table 4 shows the values found.

695
695

640
635

465
450

355
375

Example 5

90 parts of a polypropylene powder (RSV = 3.5 dl / g, i ₅ = 6.7 g / 10 minutes, density = 0.905 g / cm ³ ) and 10 parts of an ethylene-butylene copolymer with a butylene content of 32 percent by weight (RSV = 2.9 dl / g, density = 0.854 g / cm ³ ) were mixed with the amounts of y-quinacridone indicated in Table 5 in a high-speed laboratory mixer. The mixtures were granulated twice on an extruder with a screw diameter of 30 mm. The granulate was processed to press plates at 200 ° C. and test specimens were cut out.

Table 5 shows the values found.

Table 4

additive
y-quinacridone
Weight percent Notched impact strength
DIN 53453
V-notch
ASTM D 256-56
kgcm / cm ^s Melt index i ₅
ASTMD1238-52T
5 kg load
230 ⁰ C granulate
g / 10 minutes Ball indentation hardness
DIN 57302
kg / cm ²
10 seconds | 60 seconds 590
580 Limit
bending stress
DIN 53452
kg / cm ² Torsional modulus
ASTM
D 1043-51
120 ° C
kg / cm ² 0.001 15.5
30.2 7.8
7.1 645
630 430
425 320
330

Tabel

additive
y-quinacridone

Weight percent

Notched impact strength

DIN 53453

V-notch

ASTM D 256-56

kgcm / cm ²

Melt index z ₅

ASTMD1238-52T

5 kg load

230 ° C granules

g / 10 minutes ball indentation hardness
DIN 57302

kg / cm ²
Seconds 60 seconds

Bending limit stress DIN 53452

kg / cm ⁸

Torsional modulus

ASTM

D1043-51

120 ⁰ C

kg / cm ²

0.001

15.2
28.9

6.5
6.3

The effectiveness goes through the addition of usual admixtures, such as. B. stabilizers, antistatic agents, Pigments, not lost. The mixtures according to the invention can by all customary processes can be processed into any colored shaped bodies.

650
655

595
580

445 455

350

355

Claims (1)

Claim: Use of 0.0005 to 0.005 percent by weight of the y phase of the linear quinacridone of formula to improve the toughness of polypropylene or a blend of polypropylene with a Copolymer of 30 to 70 percent by weight of ethylene and 70 to 30 percent by weight of propylene and / or butylene (I), the mixture being up to 20 percent by weight of the copolymer contains. Considered publications: Swiss patent application 2163/60. 509 517/502 2.65 © Bundesdruckerei Berlin