Acrylic composition having an increased resistance to alcohols, oils and fats

Patent metadata

Field	Value
Publication number	US-11807699-B2
Application number	US-201917309706-A
Country	US
Kind code	B2
Filing date	Dec 11, 2019
Priority date	Dec 19, 2018
Publication date	Nov 7, 2023
Grant date	Nov 7, 2023

Abstract

A transparent acrylic-based polymer composition has an increased resistance to alcohols, oils and fats. The polymer composition contains: (A) a copolymer of alkyl(meth)acrylates, aromatic vinyl monomer and unsaturated carboxylic acid anhydride; (B) a copolymer containing aromatic vinyl monomer and a vinyl cyanide monomer; and (C) a particulate core-shell type graft copolymer containing a butadiene-based core as a rubbery phase and a copolymer containing alkyl(meth)acrylates and, optionally, aromatic vinyl monomer as a hard phase. The components A and B form a polymer matrix and the particulate core-shell type graft copolymer C is dispersed in said polymer matrix.

First claim

The invention claimed is:

1. A polymer composition comprising, based on the weight of the polymer composition, the following components A, B and C:
A. 40.0 to 84.0 wt.-% of a copolymer comprising alkyl(meth)acrylates, aromatic vinyl monomer and unsaturated carboxylic acid anhydride;
B. 4.0 to 20.0 wt.-%, of a copolymer comprising aromatic vinyl monomer and a vinyl cyanide monomer; and
C. 12.0 to 40.0 wt.-%, of a particulate core-shell type graft copolymer comprising a butadiene-based core as a rubbery phase and a copolymer comprising alkyl(meth)acrylates and, optionally, aromatic vinyl monomer as a hard phase;
wherein the components A and B form a polymer matrix and the particulate core-shell type graft copolymer C is dispersed in said polymer matrix; and
wherein a content of vinyl cyanide monomer in the particulate core-shell type graft copolymer C is from 0 to 5.0 wt.-%, based on the weight of the particulate core-shell type graft copolymer C.

2. The polymer composition according to claim 1 , wherein the copolymer A is a copolymer of
48.0 to 90.0 wt.-% of alkyl(meth)acrylates;
8.0 to 35.0 wt.-% of aromatic vinyl monomer; and
2.0 to 17.0 wt.-% of unsaturated carboxylic acid anhydride, based on the weight of the copolymer A.

3. The polymer composition according to claim 1 , wherein a weight average molecular weight Mw of the copolymer A is from 80000 to 240000 g/mol.

4. The polymer composition according to claim 1 , wherein the copolymer B is a copolymer of
55.0 to 90.0 wt.-% of the aromatic vinyl monomer; and
10.0 to 45.0 wt.-%, of the vinyl cyanide monomer, based on the weight of the copolymer B.

5. The polymer composition according to claim 1 , wherein
the aromatic vinyl monomer is styrene;
the vinyl cyanide monomer is acrylonitrile;
the unsaturated carboxylic acid anhydride is maleic anhydride; and
the alkyl(meth)acrylates comprise
80.0 to 100.0 wt.-% of methyl methacrylate, and
0.0 to 20.0 wt.-% of an alkyl(meth)acrylate other than methyl methacrylate, based on the weight of the alkyl(meth)acrylates.

6. The polymer composition according to claim 1 , wherein the particulate core-shell type graft copolymer C has a weight average particle diameter from 40 to 1000 nm, determined according to DIN ISO 13321 (2017) in water at 23° C.

7. The polymer composition cording to claim 1 , wherein the particulate core-shell type graft copolymer C comprises:
a butadiene-based core comprising at least 65.0 wt.-% of polybutadiene, based on the weight of the butadiene-based core; and
a shell comprising 60.0 to 100.0 wt.-% of alkyl(meth)acrylates and 0.0 to 40.0 wt.-% of the aromatic vinyl monomer, based on the weight of the shell.

8. The polymer composition according to claim 1 , wherein the haze of the composition measured at 23° C. on a 3 mm injection moulded specimen according to standard ASTM D1003 is lower than 30%.

9. The polymer composition according to claim 1 , wherein the composition has one or more of the following properties (i)-(iii):
a Vicat softening temperature according to ISO 306-B50 of at least 100° C.;
(ii) a nominal elongation at break according to ISO 527 of at least 3.0%; and/or
(iii) a modulus of elasticity according to ISO 527 of greater than 1500 MPa.

10. The polymer composition according to claim 1 , wherein the composition has a melt volume flow rate MVR, measured according to ISO 1133 at 230° C. and 5.0 kg, of greater than 0.5 cm 3 /10 min.

11. A process for manufacturing of a moulded article, the process comprising:
injection moulding the polymer composition according to claim 1 .

12. A moulded article comprising the polymer composition according to claim 1 .

13. A moulded article according to claim 12 , wherein the moulded article is a medical device.

14. A method for producing a medical device, comprising:
injection moulding the polymer composition according to claim 1 into a form of a medical device.

15. The moulded article according to claim 13 , wherein the medical device is a disposable medical diagnostic device, an intravenous and catheter accessory, a blood handling device, a chest drainage unit, a respiratory ventilating device, a medical filter housing, a permanent device housing, a tube, a connector, a fitting, or a cuvette.

16. The method according to claim 14 , wherein the medical device is a disposable medical diagnostic device, an intravenous and catheter accessory, a blood handling device, a chest drainage unit, a respiratory ventilating device, a medical filter housing, a permanent device housing, a tube, a connector, a fitting, or a cuvette.

17. The polymer composition according to claim 1 , comprising 54.0 to 78.0 wt.-% of the component A, based on the weight of the polymer composition.

18. The polymer composition according to claim 1 , comprising 6.0 to 10.0 wt.-% of the component B, based on the weight of the polymer composition.

19. The polymer composition according to claim 1 , comprising 16.0 to 36.0 wt.-% of the component C, based on the weight of the polymer composition.

20. The polymer composition according to claim 1 , wherein a content of vinyl cyanide monomer in the particulate core-shell type graft copolymer C is from 0 to 0.5 wt.-%, based on the weight of the particulate core-shell type graft copolymer C.

Assignees

• Roehm Gmbh

Inventors

• Carloff Rüdiger

Classifications

• C08F212/10 Primary

  with nitriles · CPC title

• B29C45/0001

  characterised by the choice of material · CPC title

• C08F220/06

  Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof · CPC title

• C08F222/06

  Maleic anhydride · CPC title

• C08F279/06

  Vinyl aromatic monomers and methacrylates as the only monomers · CPC title