PMMA moulding compounds with improved impact resistance

• US 7,605,193 B2
• Filed: 11/22/2006
• Issued: 10/20/2009
• Est. Priority Date: 09/04/2000
• Status: Expired due to Fees

• Current Assignee: Evonik Rã¶Hm GmbH (Rag-Stiftung)
• Original Assignee: Roehm GmbH & Co. KG
• Inventors: Arndt, Thomas, Laatsch, Joachim, Michler, Goerg, Schultes, Klaus, Suefke, Thomas, Mueller, Reiner
• Primary Examiner(s): EGWIM, KELECHI CHIDI
• Application Number:
  US11/562,669
• Publication Number:
  US 20070123610A1
• Time in Patent Office: 1,063 Days
• Field of Search: 523/201, 524/458, 524/523, 524/525, 525/85, 525/902
• US Class Current: 523/201
• CPC Class Codes: C08F 265/04 on to polymers of esters
• CPC Class Codes: C08F 265/06 Polymerisation of acrylate or methacrylate esters on to polymers thereof
• CPC Class Codes: C08F 285/00 Macromolecular compounds obtained by polymerising monomers on to preformed graft polymers
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 51/003 grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds C08L51/04, C08L51/06 take precedence
• CPC Class Codes: Y10S 525/902 Core-shell

Abstract

The invention describes a novel impact modifier, built up from core-shell1- and shell 2, the core being capable of plastic deformation. Good mechanical properties were achieved using a small amount of impact modifier.

Claims

1. An impact resistant modifier consisting of at least one multistage emulsion polymer of bonded units of:

i) a core (C) of the following polymerized monomeric components;

a) from 53 to 92.9% by weight of C₁-C₈-alkyl methacrylate,

b) from 7 to 35% by weight of C₁-C₈-alkyl acrylate,

c) from 0.1 to 2% by weight of at least one crosslinker, and

d) from 1 to 5% by weight of one or more styrene derivatives;

ii) a first shell (S1) of the following polymerized monomeric components;

a) from 75 to 99.9% by weight of at least one C₁-C₈-alkyl acrylate,

b) from 0 to 25% by weight of one or more styrene derivatives, and

c) from 0.1 to 2% by weight of at least one crosslinker, and

iii) a second shell (S2), of the following polymerized monomeric components;

a) from 80 to 100.00% by weight of at least one C₁-C₈-alkyl methacrylate,

b) from 0 to 20% by weight of at least one C₁-C₈-alkyl acrylate, and

c) from 0 to 5% by weight of at least one regulator.

2. The impact modifier according to claim 1, wherein the core (C) consists of at least from 7-35% by weight of ethyl acrylate.

3. The impact modifier according to claim 1, wherein the core (C) consists of at least from 5 to 30% by weight of butyl acrylate.

4. The impact modifier according to claim 1, wherein the second shell (S2) is obtained by polymerizing the monomeric components in the presence of from 0.1 to 1% by weight of at least one regulator, wherein % by weight is based on the entirety of monomers and regulator in S2.

5. The impact modifier according to claim 1, wherein the glass transition temperature of the polymerized monomeric components excluding the crosslinkers is from 30 to 105°

C., as calculated by the Fox equation.

6. The impact modifier according to claim 1, comprising from 15 to 35 % by weight of the core (C), from 30 to 55% by weight of the first shell (S1), and from 10 to 40% by weight of the second shell (S2).

7. A molding comprising a molding composition comprising from 3 to 80% by weight of the impact modifier consisting of a multistage emulsion polymer of bonded units of:

i) a plastically deformable core (C) of the following polymerized monomeric components;

a) from 53 to 92.9% by weight of C₁-C₈-alkyl methacrylate,

b) from 7 to 35% by weight of C₁-C₈-alkyl acrylate,

c) from 0.1 to 2% by weight of at least one crosslinker, and

d) from 1 to 5% by weight of one or more styrene derivatives;

ii) an elastomeric first shell (S1) of the following polymerized monomeric components;

a) from 75 to 99.9% by weight of at least one C₁-C₈-alkyl acrylate,

b) from 0 to 25% by weight of one or more styrene derivatives, and

c) from 0.1 to 2% by weight of at least one crosslinker, and

iii) a hard second shell (S2), of the following polymerized monomeric components;

a) from 80 to 100.00% by weight of at least one C₁-C₈-alkyl methacrylate,

b) from 0 to 20% by weight of at least one C₁-C₈-alkyl acrylate, and

c) from 0 to 5% by weight of at least one regulator, and from 97 to 20% by weight of a thermoplastic molding composition comprising polymerized units of methyl methacrylate.

8. An impact resistant modifier consisting of at least one multistage emulsion polymer of bonded units of:

i) a core (C) of the following polymerized monomeric components;

a) from 53 to 92.9% by weight of C₁-C₈-alkyl methacrylate,

b) from 7 to 35% by weight of C₁-C₈-alkyl acrylate,

c) from 0.1 to 2% by weight of at least one crosslinker, and

d) from 1 to 5% by weight of one or more styrene derivatives;

ii) a first shell (S1) of the following polymerized monomeric components;

a) from 75 to 99.9% by weight of at least one C₁-C₈-alkyl acrylate,

b) from 0 to 25% by weight of one or more styrene derivatives, and

c) from 0.1 to 2% by weight of at least one crosslinker, and

iii) a second shell (S2), of the following polymerized monomeric components;

a) from 80 to 100.00% by weight of at least one C₁-C₈-alkyl methacrylate,

b) from 0 to 20 % by weight of at least one C₁-C₈-alkyl acrylate, and

c) from 0.1 to 1% by weight of at least one regulator, wherein % by weight is based on the entirety of monomers and regulator in S2.

9. A molding comprising a molding composition comprising from 3 to 80% by weight of the impact modifier consisting of a multistage emulsion polymer of bonded units of:

i) a plastically deformable core (C) of the following polymerized monomeric components;

a) from 53 to 92.9% by weight of C₁-C₈-alkyl methacrylate,

b) from 7 to 35% by weight of C₁-C8-alkyl acrylate,

c) from 0.1 to 2% by weight of at least one crosslinker, and

d) from 1 to 5% by weight of one or more styrene derivatives;

ii) an elastomeric first shell (S1) of the following polymerized monomeric components;

a) from 75 to 99.9% by weight of at least one C₁-C₈-alkyl acrylate,

b) from 0 to 25% by weight of one or more styrene derivatives, and

c) from 0.1 to 2% by weight of at least one crosslinker, and

iii) a hard second shell (S2), of the following polymerized monomeric components;

a) from 80 to 100.00% by weight of at least one C₁-C₈-alkyl methacrylate,

b) from 0 to 20% by weight of at least one C₁-C₈-alkyl acrylate, and

c) from 0.1 to 1% by weight of at least one regulator, and from 97 to 20% by weight of a thermoplastic molding composition comprising polymerized units of methyl methacrylate.