Composition and thermoplastic molding compound having good notch impact strength and improved melt stability

Patent metadata

Field	Value
Publication number	US-11111380-B2
Application number	US-201716469462-A
Country	US
Kind code	B2
Filing date	Dec 22, 2017
Priority date	Dec 28, 2016
Publication date	Sep 7, 2021
Grant date	Sep 7, 2021

Abstract

The invention relates to a composition for production of a thermoplastic moulding compound, wherein the composition comprises or consists of the following constituents,A) at least one polymer selected from the group consisting of aromatic polycarbonate, aromatic polyester carbonate and aromatic polyester,B) polymer free of epoxy groups, consisting ofB.1) rubber-modified vinyl (co)polymer prepared by the emulsion polymerization method andB.2) optionally, a rubber-free vinyl (co)polymer,C) a block or graft polymer comprising structural elements deriving from styrene and at least one epoxy-comprising vinyl monomer,D) one or more further additives,and to a process for producing a moulding compound from the composition, to the moulding compound itself, to the use of the composition or the moulding compound for production of mouldings, and to the mouldings themselves.

First claim

What is claimed is:

1. A composition for production of a thermoplastic moulding compound, wherein the composition comprises the following constituents:
A) 30% to 90% by weight of at least one polymer selected from the group consisting of aromatic polycarbonate, aromatic polyester carbonate, and aromatic polyester based on the total weight of the composition,
B) 5% to 65% by weight of a polymer free of epoxy groups based on the total weight of the composition, the polymer free of epoxy groups consisting of
B1) a rubber-modified vinyl (co)polymer prepared by the emulsion polymerization method and
B2) optionally, a rubber-free vinyl (co)polymer,

C) 0.5% to 10% by weight of a block or graft polymer comprising structural elements deriving from styrene and at least one epoxy-comprising vinyl monomer based on the total weight of the composition,
D) 0.001% to 20% by weight of one or more further additives based on the total weight of the composition,

wherein component A has a proportion by weight of phenolic OH groups of 50 to 2000 ppm,
wherein component C has a weight ratio of structural elements deriving from styrene to those deriving from epoxy-comprising vinyl monomer of 100:1 to 1:1,
and wherein at least one of the composition constituents comprises a Brønsted-acidic and/or Brønsted-basic compound.

2. The composition according to claim 1 , wherein component A has phenolic OH groups, and the stoichiometric ratio of the epoxy groups of component C to the phenolic OH groups of component A is at least 1:1.

3. The composition according to claim 1 , wherein component C comprises structural units derived from at least one further styrene-copolymerizable vinyl monomer free of epoxy groups.

4. The composition according to claim 3 , wherein the weight ratio of the structural units derived from styrene to those derived from styrene-copolymerizable vinyl monomer free of epoxy groups in component C is in the range from 85:15 to 60:40.

5. The composition according to claim 3 , wherein component C comprises structural units derived from acrylonitrile.

6. The composition according to claim 1 , wherein the epoxy-comprising vinyl monomer is glycidyl methacrylate.

7. The composition according to claim 1 , wherein component C has an epoxy content measured according to ASTM D 1652-11 in dichloromethane of 0.1% to 5% by weight.

8. The composition according to claim 1 , wherein component C is a block or graft polymer prepared by free-radically initiated polymerization of styrene and an epoxy-comprising vinyl monomer and optionally further copolymerizable vinyl monomers free of epoxy groups in the presence of a polymer selected from the group consisting of: polycarbonate, polyester, polyester carbonate, polyolefin, polyacrylate, and polymethacrylate.

9. The composition according to claim 1 , wherein component C is a block or graft polymer prepared by reaction of an epoxy-comprising styrene polymer with a polymer comprising OH groups which is selected from the group consisting of: polycarbonate, polyester, and polyester carbonate.

10. The composition according to claim 1 , wherein component B comprises a Brønsted-basic compound.

11. The composition according to claim 1 , wherein component D comprises a Brønsted-acidic compound in a proportion of from 0.001 to 0.2% by weight, based on the sum of compounds A to D.

12. A moulding compound obtained by compounding the constituents of the composition according to claim 1 at temperatures in the range from 200 to 350° C.

13. A process for production of mouldings, the process comprising:
utilizing the moulding compound according to claim 12 .

14. A moulding produced from the moulding compound according to claim 12 .

15. A process for production of mouldings, the process comprising:
utilizing the composition according to claim 1 .

16. A moulding produced from the composition according to claim 1 .

17. A composition for production of a thermoplastic moulding compound, wherein the composition consists of the following constituents:
A) 30% to 90% by weight of at least one polymer selected from the group consisting of aromatic polycarbonate, aromatic polyester carbonate, and aromatic polyester based on the total weight of the composition,
B) 5% to 65% by weight of a polymer free of epoxy groups based on the total weight of the composition, the polymer free of epoxy groups consisting of
B1) a rubber-modified vinyl (co)polymer prepared by the emulsion polymerization method and,
B2) optionally, a rubber-free vinyl (co)polymer,

C) 0.5% to 10% by weight of a block or graft polymer comprising structural elements deriving from styrene and at least one epoxy-comprising vinyl monomer based on the total weight of the composition,
D) 0.001% to 20% by weight of one or more further additives based on the total weight of the composition,

wherein component A has a proportion by weight of phenolic OH groups of 50 to 2000 ppm,
wherein component C has a weight ratio of structural elements deriving from styrene to those deriving from epoxy-comprising vinyl monomer of 100:1 to 1:1,
and wherein at least one of the composition constituents comprises a Brønsted-acidic and/or Brønsted-basic compound.

Assignees

• Covestro Deutschland Ag

Inventors

• Seidel Andreas
• Hobeika Sven
• Hufen Ralf
• Eckel Thomas

Classifications

• C08L69/00 Primary

  Compositions of polycarbonates; Compositions of derivatives of polycarbonates · CPC title

• C08L67/02 Primary

  Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence) · CPC title

• C08L69/005

  Polyester-carbonates · CPC title

• C08L25/08

  Copolymers of styrene (C08L29/08, C08L35/06, C08L55/02 take precedence) · CPC title

• C08L55/02

  ABS [Acrylonitrile-Butadiene-Styrene] polymers · CPC title