Impact-resistant molding material having an improved characteristics profile

Patent metadata

Field	Value
Publication number	US-10358552-B2
Application number	US-201515513649-A
Country	US
Kind code	B2
Filing date	Sep 16, 2015
Priority date	Sep 24, 2014
Publication date	Jul 23, 2019
Grant date	Jul 23, 2019

Abstract

The invention relates to an impact-modified molding composition, especially impact-modified PMMA, having an improved profile of properties, especially also at elevated temperatures, to molded articles obtainable therefrom and to the use of the molding composition and the molded article.

First claim

The invention claimed is:

1. A moulding composition comprising, based in each case on the total weight thereof:
I. 10.0% to ≤35.0% by weight, of at least one core-shell-shell particle produced or producible by a process in which
a) water and emulsifier are initially charged,
b) 20.0 to 45.0 parts by weight of a first composition comprising:
A) 50.0 to 99.9 parts by weight, of alkyl methacrylates having 1 to 20 carbon atoms in the alkyl radical,
B) 0.0 to 40.0 parts by weight, of alkyl acrylates having 1 to 20 carbon atoms in the alkyl radical,
C) 0.1 to 10.0 parts by weight of crosslinking monomers and
D) 0.0 to 8.0 parts by weight of styrenic monomers of the general formula (I)

where the R 1 to R 5 radicals each independently denote hydrogen, a halogen, a C 1-6 -alkyl group or a C 2-6 -alkenyl group and the R 6 radical is hydrogen or an alkyl group having 1 to 6 carbon atoms,
are added and polymerized up to a conversion of at least 85.0% by weight, based on the total weight of components A), B), C) and D),
c) 35.0 to 55.0 parts by weight of a second composition comprising:
E) 80.0 to 100.0 parts by weight of (meth)acrylates,
F) 0.05 to 5.0 parts by weight of crosslinking monomers and
G) 0.0 to 25.0 parts by weight of styrenic monomers of the general formula (I)

are added and polymerized up to a conversion of at least 85.0% by weight, based on the total weight of components E), F) and G),
d) 10.0 to 30.0 parts by weight of a third composition comprising:
H) 50.0 to 100.0 parts by weight of alkyl methacrylates having 1 to 20 carbon atoms in the alkyl radical,
I) 0.0 to 40.0 parts by weight of alkyl acrylates having 1 to 20 carbon atoms in the alkyl radical and
J) 0.0 to 10.0 parts by weight of styrenic monomers of the general formula (I)

are added and polymerized up to a conversion of at least 85.0% by weight, based on the total weight of components H), I) and J),
where the stated proportions by weight of compositions b), c) and d) add up to 100.0 parts by weight,

where the relative proportions of all substances A) to J) are chosen so as to obtain core-shell-shell particles having a total radius, measured by the Coulter method, in the range of >125.0 nm and <180 nm, and
where each polymerization in the process according to I. is conducted at a temperature in the range of >60 to <95 ° C.;
II. 1.0% to 90.0% by weight, of at least one (meth)acrylic polymer,
III. 0.0% to 45% by weight, of styrene-acrylonitrile copolymers, and
IV. 0.0% to 10.0% by weight of further additives,
where the percentages by weight of components I) to IV) add up to 100.0% by weight and
where II., or the mixture of II., III. and/or IV., is chosen such that it has a refractive index which, when measured according to ISO 489 (Method A), differs by not more than 0.01 unit from the refractive index of I,
wherein the moulding composition has
a. a Charpy impact resistance to ISO 179 of at least 40.0 kJ/m 2 at 23° C.,
b. a haze to ASTM D 1003 (1997) of ≤3% at 23° C. and a haze to ASTM D 1003 (1997) of ≤21% at 80° C.,
c. a Vicat softening temperature to DIN ISO 306 (August 1994) of ≥98° C., and
d. a melt volume flow rate MVR to ISO 1133 (230° C.; 3.8 kg) of ≥1.5 cm 3 /10 min.

2. The moulding composition according to claim 1 , wherein the second composition of the core-shell-shell particle according to I. comprises, as G), more than 8.0 and up to 19.95 parts by weight, of styrenic monomers of the general formula (I).

3. The moulding composition according to claim 1 , wherein the second composition of the core-shell-shell particle according to I. has a Tg of <−10° C.

4. The moulding composition according to claim 1 , wherein, in the process for obtaining I., the polymerization in steps b) to d) is initiated using a peroxodisulphate.

5. The moulding composition according to claim 1 , wherein the at least one (meth)acrylic polymer according to II. comprises, based in each case on the total weight thereof:
a) 52.0% to 100.0% by weight of repeat alkyl methacrylate units having 1 to 20 carbon atoms in the alkyl radical,
b) 0.0% to 40.0% by weight of repeat alkyl acrylate units having 1 to 20 carbon atoms in the alkyl radical and
c) 0.0% to 8.0% by weight of repeat styrenic units of the general formula (I),
where the percentages by weight add up to 100.0% by weight.

6. The moulding composition according to claim 1 , wherein the at least one (meth)acrylic polymer according to II., based in each case on the total weight thereof, contains ≤8% by weight of repeat alkyl acrylate units having 1 to 20 carbon atoms in the alkyl radical.

7. The moulding composition according to claim 1 , wherein the moulding composition comprises styrene-acrylonitrile copolymers according to III., the styrene-acrylonitrile copolymers having been obtained by polymerizing a mixture consisting of
70% to 92% by weight of styrene,
8% to 30% by weight of acrylonitrile and
0% to 22% by weight of further comonomers, based in each case on the total weight of the mixture.

8. The moulding composition according to claim 1 , wherein the moulding composition, based on the total weight thereof, comprises 0.1% to 10.0% by weight of a further polymer as additive according to IV., having a weight-average molecular weight at least 10% higher compared to the at least one (meth)acrylic polymer according to II.

9. A moulding article obtained from a moulding composition according to claim 1 , wherein the moulded article has
a. a Charpy impact resistance to ISO 179 of at least 40.0 kJ/m 2 at 23° C.,
b. a haze to ASTM D 1003 (1997) of ≤3% at 23° C., and a haze to ASTM D 1003 (1997) of ≤21% at 80° C.,
c. a Vicat softening temperature to DIN ISO 306 (August 1994) of ≥98° C., and
d. a melt volume flow rate MVR to ISO 1133 (230° C., 3.8 kg) of ≥1.5 cm 3 /10 min.

10. The article according to claim 9 , which is selected from the group consisting of
large and/or thin-walled impact-resistant components; glass panes/glazing; displays for communication devices; tablet PCs; TV devices; kitchen appliances and other electronic devices; building interior lighting and exterior lighting.

11. The article according to claim 9 , which is selected from the group consisting of an impact-modified and large and/or thin-walled injection-moulded component; glass panes/glazing; coloured glass covers for automobile lights; a display for a communication device; a TV device; a tablet PC; a kitchen appliance another electronic device; building interior lighting and exterior lighting.

12. The moulding composition according to claim 1 , wherein the relative proportions of all substances A) to J) are chosen so as to obtain core-shell-shell particles having a total radius, measured by the Coulter method, in the range of >125.0 nm and <150 nm.

13. The moulding composition according to claim 1 , wherein the relative proportions of all substances A) to J) are chosen so as to obtain core-shell-shell particles having a total radius, measured by the Coulter method, in the range of >125.0 nm and <145 nm.

14. The moulding composition according to claim 4 , wherein the peroxodisulphate is at least one selected from the group consisting of ammonium peroxodisulphate and alkali metal peroxodisulphate.

Assignees

• Doessel Lukas Friedrich
• Mueller Reiner
• Hoess Werner
• Klitsch Julian
• Evonik Roehm Gmbh

Inventors

• Doessel Lukas Friedrich
• Mueller Reiner
• Hoess Werner
• Klitsch Julian

Classifications

• C08L51/00

  Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds (for ABS polymers C08L55/02); Compositions of derivatives of such polymers · CPC title

• C08L2207/53

  Core-shell polymer · CPC title

• C08F2/24

  with the aid of emulsifying agents · CPC title

• C08F285/00

  Macromolecular compounds obtained by polymerising monomers on to preformed graft polymers · CPC title

• C08F220/40

  Esters of unsaturated alcohols {, e.g. allyl (meth)acrylate} · CPC title