EP1399509A1

EP1399509A1 - Composite containing abs

Info

Publication number: EP1399509A1
Application number: EP02743108A
Authority: EP
Inventors: Edgar Leitz; Harry Staratschek; Herbert Eichenauer; Wolfgang Siebourg
Original assignee: Bayer AG
Current assignee: Styrolution Jersey Ltd
Priority date: 2001-06-07
Filing date: 2002-05-27
Publication date: 2004-03-24
Also published as: MXPA03011241A; JP2004527645A; DE10127748A1; CN1541250A; CN100354366C; KR20040010685A; WO2002098978A1; US20030008948A1

Abstract

The invention relates to composites containing: I) an ABS component comprising A) an ABS polymer and B) between 0.05 and 5 wt. % of at least one phenol containing at least one sterically inhibited hydroxyl group, selected from structural units of the general formulae (I) to (IV), in which R represents C10-C18 alkyl; II) at least one additional material selected from metals, other plastic materials, or other materials.

Description

Composite containing ABS

The invention relates to composites containing an ABS component and at least one further material and molded parts obtainable from these composites.

ABS-type polymers are two-phase plastics

1) a thermoplastic copolymer of resin-forming monomers, e.g. Styrene and acrylonitrile, the styrene being able to be replaced in whole or in part by methylstyrene or methyl methacrylate; this copolymer, also known as SAN resin or matrix resin, forms the outer phase;

2) at least one graft polymer which has been prepared by grafting one or more of the monomers mentioned under 1)

Butadiene homo- or copolymer ("graft base"). This graft polymer ("elastomer phase" or "graft rubber") forms the disperse phase in the matrix resin.

The ABS polymers 1) and 2) can be prepared by known processes, such as emulsion

Solution, bulk, suspension, precipitation polymerization or by combining such processes.

Are composites by gluing these ABS polymers, in particular those ABS polymers, in which at least one of components 1) and 2) through

Bulk or solution polymerization process was produced, there may be insufficient adhesive behavior or undesired detachment between the adhesive layers. It was therefore an object of the present invention to provide composites composed of an ABS component and at least one further material which do not have such an insufficient adhesive behavior.

It has now surprisingly been found that this object is achieved by ABS polymers which contain defined amounts of sterically hindered phenols.

The invention thus relates to composites

I) containing an ABS component

A) an ABS polymer and

B) 0.05 to 5% by weight, preferably 0.1 to 4% by weight and particularly preferably 0.5 to 3% by weight, based on I), of at least one phenol containing at least one sterically hindered Hydroxyl group selected from structural units of the general formulas (I) to (IV)

(I) (ID (Hl) ( ^{| v} )

where R is CJO-C ig-alkyl, and

II) at least one further material selected from metals, preferably aluminum or steel, other plastics, preferably polyvinyl chloride, polyalkylene terephthalate, polycarbonate, polyamide or polyolefms or

Mixtures of these, particularly preferably polyethylene and polypropylene, and other materials, preferably wood. ABS polymers according to A) included

Al) 5 to 100% by weight, preferably 7.5 to 80% by weight and particularly preferably 10 to 70% by weight of at least one graft polymer obtained by solution, suspension or bulk polymerization or 5 to 80% by weight , preferably 7.5 to 70 wt .-% and particularly preferably 10 to 60 wt .-% of at least one graft polymer obtained by emulsion polymerization and

A.2) 95 to 0% by weight, preferably 92.5 to 20% by weight and particularly preferably 90 to 30% by weight (when using a graft polymer obtained by solution, suspension or bulk polymerization) or 95 to 20% by weight, preferably 92.5 to 30% by weight and particularly preferably 90 to 40% by weight (when using one obtained by emulsion polymerization

Graft polymer) at least one thermoplastic resin.

For the purposes of the invention, graft polymers are those in which, on a rubber (graft base), monomers or monomer mixtures selected from acrylonitrile, methacrylonitrile, maleic anhydride, N-substituted maleimide,

Styrene, methylstyrene, nucleus-substituted styrene, methyl methacrylate are graft-polymerized.

Suitable rubbers are practically all rubbers with glass transition temperatures <10 ° C., preferably those which contain copolymerized butadiene. Examples are polybutadiene, styrene-butadiene polymers, acrylonitrile-butadiene polymers, acrylic rubbers, optionally with built-in structural units derived from butadiene, acrylate rubbers which comprise a crosslinked rubber such as polybutadiene or a copolymer of butadiene with an ethylenically unsaturated or monomer such as styrene and / Acrylonitrile as the core.

Polybutadiene is preferred. The graft polymers contain 3 to 95% by weight, in particular 5 to 70% by weight of rubber and 97 to 5% by weight, in particular 95 to 30% by weight of graft-copolymerized monomers. The rubbers are present in these graft polymers in the form of at least partially crosslinked particles with an average particle diameter (d ₅₀ ) of 0.05 to 20.0 μm and particularly preferably from 0.1 to 0.8 μm, the average particle diameter d ₅₀ being measured by means of an ultracentrifuge ( see W. Scholtan, H. Lange: Kolloid.-Z. and Z. Polymer 250 (1972), 782-796).

Suitable manufacturing processes are emulsion, solution, bulk or suspension polymerizations; Those graft polymers A) which are prepared by means of emulsion polymerization and / or solution or bulk polymerization are particularly preferred.

The thermoplastic polymers A.2) can be obtained from the monomers graft-polymerized on the rubber (graft monomers) or similar monomers, in particular from at least two monomers selected from styrene, α-methylstyrene, p-methylstyrene, halostyrene, acrylonitrile, methacrylonitrile, methyl methacrylate, maleic anhydride , N-substituted maleimides, especially N-phenyl maleimide, or mixtures thereof.

Preferred thermoplastic resins A.2) are copolymers obtained from 95 to 50% by weight of styrene, α-methylstyrene or methyl methacrylate or mixtures thereof and 5 to 50% by weight of acrylonitrile, methacrylonitrile, methyl methacrylate or maleic anhydride or mixtures thereof.

Particularly preferred thermoplastic copolymers contain 20 to 40% by weight of acrylonitrile and 80 to 60% by weight of styrene or α-methylstyrene in copolymerized form. These copolymers are known. They preferably have molecular weights (M _w ) of 15,000 to 200,000 (determined by means of gel permeation chromatography (GPC)). The thermoplastic polymers A.2) are preferably prepared by solution or bulk polymerization.

Particularly suitable ABS polymers A) are made up of

A.l.l 5 to 100% by weight of at least one graft polymer obtained by solution, suspension or bulk polymerization or 5 to 80% by weight of at least one graft polymer obtained by emulsion polymerization, each prepared by graft polymerization of

1.1 5 to 97 wt .-% of a mixture of

1.1.1 5 to 50% by weight of acrylonitrile, methacrylonitrile, maleic anhydride or N-substituted maleimide or mixtures thereof and

1.1.2 95 to 50% by weight of styrene, α-methylstyrene, nucleus-substituted styrene or methyl methacrylate or mixtures thereof

1.2 95 to 3 wt .-% of at least one rubber with a glass transition temperature T _Q <10 ° C and

A.l.2 0 to 95 wt .-% (when using a graft copolymer obtained by solution, suspension or bulk polymerization) or 20 to 95

% By weight (when using one obtained by emulsion polymerization

Graft polymer) of at least one thermoplastic resin, produced by

Solution, suspension or bulk polymerization

2.1 5 to 50 wt .-% acrylonitrile, methacrylonitrile, maleic anhydride or N-substituted maleimide or mixtures thereof and 2.2 95 to 50% by weight of styrene, α-methylstyrene, nucleus-substituted styrene or methyl methacrylate or mixtures thereof.

Compounds with at least one sterically hindered hydroxyl group according to component B) are known or can be prepared in a known manner. Examples of suitable compounds B) are the compounds of the formulas (V) to (XXV) known as antioxidants.

(V) (VI) (VII)

(XIV) (XV)

(XVI)

(XVII)

(XXI)

(XXIII)

The compounds of the formulas (V) and (XLX) which are commercially available under the trade names Irganox® 1076 or Irganox® 245 are particularly preferred. These compounds are admixed with the ABS polymer described above at higher temperatures, for example 100 ° to 300 ° C., in conventional mixing units, kneaders, internal mixers, roller mills, screw machines or extruders. The dwell times in the mixing process can vary between 10 seconds and 30 minutes depending on the intensity of the mixing.

In addition to the compounds to be used according to the invention, the usual additives such as pigments, fillers, stabilizers, antistatic agents, lubricants, mold release agents, flame retardants and the like can be added to the ABS component.

The connection of the ABS component with other materials to the composites according to the invention is preferably carried out by gluing. For this purpose, the adhesives known to the person skilled in the art for bonding to composites are suitable. Epoxy and acrylate adhesives are particularly preferred.

The composites according to the invention are suitable for the production of molded parts, foils and plates.

Examples of such molded parts are laminates which are made up of two or more layers, for example foils or plates consisting of metal and plastic layers.

Examples

All parts given are parts by weight.

1. Components used

Al) graft rubber of 50 wt .-% of polybutadiene having an average particle diameter (d ₅ o) of 0.35 microns, are graft polymerized to 36.5 wt .-% styrene and 13.5 wt .-% of acrylonitrile in emulsion. A.2) Graft rubber made from 50% by weight of polybutadiene with an average particle diameter (dso) of 0.1 μm, onto which 36.5% by weight of styrene and 13.5% by weight of acrylonitrile in the emulsion are graft-polymerized. A.3) Styrene / acrylonitrile (SAN) = 72:28 - copolymer with an average molecular weight M _w of about 85,000, produced by solution polymerization. A.4) Styrene / acrylonitrile (SAN) = 72:28 - copolymer with an average molecular weight M _w of about 85,000, produced by emulsion polymerization.

B.1) Irganox ^® 1076 (Ciba, Basel, Switzerland) B.2) Irganox ^® 245 (Ciba, Basel, Switzerland)

C.1) polyvinyl alcohol (Mowiol ^® 26-88, Hoechst AG) C.2) sodium salt of a resin acid mixture (sodium salt of Dresinate 731 ^®,

Abieta Chemie GmbH, Gersthofen) C.3) Maleic anhydride

2. Production and testing of the molding compounds

The parts by weight of the individual polymer components given in Table 1 are mixed with the additives likewise given in Table 1 and 0.5 part by weight of ethylenediamine bisstearylamide in an internal kneader at 200 ° C. to 230 ° C. within 3 to 5 minutes and then granulated. The granules are pressed at approx. 0.5 mm thick sheets at 195 ° C. The foils cut from it are then coated on one side with an aluminum plate (approx. 1 mm) and on the other side with a polyethylene foil using a two-component adhesive (Araldit ^® AW 136 H from Ciba, Basel, Switzerland, hardener HY 994 from the company Ciba, Basel, Switzerland). After gluing the

Plate-film composite is cured in the press (load 10 t) at 100 ° C within 20 min, after which it is cooled to room temperature under constant load in the press.

The adhesive strength is checked 2 days after adhesive curing by manual

Examination according to the following gradation:

+: Composite cannot be separated manually (good adhesion) 0: composite can be partially separated manually (poor adhesion) -: composite can be easily separated manually (no liability)

The evaluation of the adhesive strength test likewise given in Table 1 shows that the ABS polymers according to the present invention have a very good bond both to metals and to polyolefins when bonded.

Table 1

Compositions of the ABS polymers and test results (adhesive strength) of the composites made from them.

Example A.l A.2 A.3 A.4 B.l B.2 C.l C.2 C.3 Adhesive strength in manual testing (data in parts by weight)

1 33.5 33.5 33 - 2 +

2 33.5 33.5 33 - - 2.5 +

3 (cf.) 33.5 33.5 33 - -

4 (cf.) 33.5 33.5 33 - -

5 (cf.) 33.5 33.5 33 - -

6 (cf.) 33.5 33.5 33 - -

7 (cf.) 33.5 33.5 - 33 - 0

8 33.5 33.5 - 33 1.5 +

Claims

claims

1. Containing alliances

I) containing an ABS component

A) an ABS polymer and

B) 0.05 to 5% by weight of at least one phenol containing at least one sterically hindered hydroxyl group, selected from structural units of the general formulas (I) to (TV)

(I) (II) (IM) ^(,)

wherein R is C i -C i g-alkyl, and

II) at least one further material selected from metals, other plastics, and other materials.

2. Composites according to claim 1, wherein the ABS polymer A) consists of

1. 5 to 100% by weight of at least one graft copolymer obtained by solution, suspension or bulk polymerization or 5 to 80% by weight of at least one graft copolymer obtained by emulsion polymerization, each prepared by graft polymerization of

1.1 5 to 97 wt .-% of a mixture of

1.1.1 5 to 50 wt .-% acrylonitrile, methacrylonitrile, maleic anhydride, N-substituted maleimide or mixtures thereof and

1.1.2 95 to 50% by weight of styrene, α-methylstyrene, nucleus-substituted styrene, methyl methacrylate or mixtures thereof

2. 0 to 95% by weight (when using a graft copolymer obtained by solution, suspension or bulk polymerization) or 20 to 95% by weight (when using a graft copolymer obtained by emulsion polymerization) of at least one thermoplastic resin, prepared by solution, Suspension or bulk polymerization

2.1 5 to 50% by weight of acrylonitrile, methacrylonitrile, maleic anhydride,

N-substituted maleimide or mixtures thereof and

2.2 95 to 50% by weight of styrene, α-methylstyrene, nucleus-substituted styrene, methyl methacrylate or mixtures thereof. Composites according to claim 1, wherein the phenolic compound B has the structure

Has.

4. Composites according to claim 1, wherein the phenolic compound has the structure

Has.

5. Composites according to claim 1, wherein the further materials are selected from aluminum, steel, polyvinyl chloride, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polyamide, polyethylene and polypropylene, and wood.

6. Composites according to claim 1, wherein the ABS component with the others

Materials is glued.

7. Composites according to claim 1, wherein the ABS component is glued to the other materials by means of an epoxy or acrylate adhesive.

8. Using ABS components containing

A) an ABS polymer and B) 0.05 to 5% by weight of at least one phenol containing at least one sterically hindered hydroxyl group, selected from structural units of the general formulas (I) to (TV)

wherein R Ci _Q -C _j g alkyl means for the production of compounds.

9. Use of compounds according to claims 1 to 6 for the production of

Molded parts, foils and plates.

10. Moldings, foils and plates obtainable from composites according to claims 1 to 6.