ABS materials

Details ABS materials ABS materials

1994-06-20

2001-05-08

Buttner, David J. (Department: 1712)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S064000, C525S066000, C525S080000, C525S083000, C525S084000, C525S085000, C525S086000

Reexamination Certificate

active

06228938

ABSTRACT:

ABS polymers are distinguished by a balanced set of general properties and have therefore been used for many years in large amounts as thermoplastic resins for the manufacture of moulded items of all types.
With increasing use of these polymers, however, the demands on the ABS material are also increasing, especially if new types of parts are being prepared from it or new areas of application are intended to be developed by the use of this thermoplastic material.
Thus, for new types of application, e.g. for the manufacture of parts with large areas or with long flow paths (when injection moulding), materials are required which simultaneously possess high strength, sufficiently high heat resistance, high surface gloss and very good processability.
ABS materials which possess each of the required properties separately, are known, e.g. ABS polymers with high strength are described in EP-A 116 330; although here only products without a good surface gloss, with low heat resistance and very low hardness are obtainable.
The preparation of ABS polymers with very good flow properties by adding relatively large amounts of lubricant is also known, but this additive simultaneously impairs the other properties.
It was found that the following mixtures of the ABS type simultaneously possess very high strength, high heat resistance, good hardness, good surface gloss and very good processability:
A) 5 to 80 parts by weight, preferably 20 to 70 parts by weight, of a thermoplastic co- or terpolymer, made from the monomers styrene, &agr;-methylstyrene, methyl methacrylate, acrylonitrile, with an average molecular weight ({overscore (M)}
w
) of 70,000 to 150,000, preferably 75,000 to 120,000, most preferably 70,000 to 119,000,
B) 1 to 30 parts by weight, preferably 4 to 20 parts by weight, of a thermoplastic copolymer made from 60 to 95% by weight, preferably 65 to 85% by weight, of styrene and/or &agr;-methylstyrene and 40 to 5% by weight, preferably 35 to 15% by weight, of acrylonitrile with an average molecular weight ({overscore (M)}
w
) of 25,000 to 60,000, preferably 30,000 to 55,000, most preferably 25,000 to 49,500,
C) 0.1 to 10 parts by weight, preferably 0.5 to 5 parts by weight of a thermoplastic co- or terpolymer, made from the monomers styrene, &agr;-methylstyrene, methyl methacrylate, acrylonitrile, with an average molecular weight ({overscore (M)}
w
) of 1,500 to 6,000, preferably 2,000 to 6,000, and
D) 0.5 to 50 parts by weight, preferably 1 to 40 parts by weight, particularly 12 to 35 parts by weight, of a particulate grafted rubber with a glass transition temperature ≦10° C. and an average particle diamater (d
50
) of 0.05 to 0.50 &mgr;m, preferably 0.10 to 0.45 &mgr;m which contains 15 to 80 parts by weight, preferably 20 to 75 parts by weight, of a chemically bonded polymer made from styrene, methyl methacrylate, acrylonitrile or mixtures thereof, per 100 parts by weight of rubber.
The mixtures according to the invention (moulding compounds) may be prepared by blending A, B, C and D in the molten state, optionally with the addition of the usual additives, until a homogeneous state is achieved.
A preferred process for the preparation of the moulding compounds is to mix B, C and D first and then to blend this mixture with A.
In a preferred embodiment the mixtures contain additionally
E) 10 to 300 parts by weight, preferably 25 to 200 parts by weight, and particularly preferably 25 to 150 parts by weight, of an aromatic poly-carbonate and/or polyalkylene terephthalate, per 100 parts by weight of A+B+C+D.
These mixtures have the following preferred compositions:
A) 5 to 60 parts by weight, preferably 10 to 50 parts by weight, of a thermo-plastic co- or terpolymer made from the monomers styrene, &agr;-methylstyrene, methyl methacrylate, acrylonitrile, with an average molecular weight, ({overscore (M)}
w
) of 70,000 to 150,000, preferably 75,000 to 120,000, most preferably 70,000 to 119,000,
B) 1 to 15 parts by weight, preferably 2 to 10 parts by weight, of a thermo-plastic copolymer made from 60 to 95% by weight, preferably 65 to 85% by weight of styrene and/or &agr;-methylstyrene and 40 to 5% by weight, preferably 35 to 15% by weight, of acrylonitrile, with an average molecular weight ({overscore (M)}
w
) of 25,000 to 60,000, preferably 30,000 to 55,000, most preferably 25,000 to 49,500,
C) 0.1 to 5 parts by weight, preferably 0.5 to 2.5 parts by weight, of a thermoplastic co- or terpolymer, made from the monomers styrene, &agr;-methylstyrene, methyl methacrylate, acrylonitrile, with an average molecular weight ({overscore (M)}
w
) of 1,500 to 6,000, preferably 2,000 to 6,000,
D) 0.5 to 40 parts by weight, preferably 1 to 35 parts by weight, in particular 5 to 35 parts by weight, of a particulate grafted rubber with a glass transition temperature of ≦10° C. and an average particle diameter (d
50
) of 0.05 to 0.50 &mgr;m, preferably 0.10 to 0.45 &mgr;m, which contains 15 to is 80 parts by weight, preferably 20 to 75 parts by weight, of a chemically bonded polymer made from styrene, methyl methacrylate, acrylonitrile or mixtures thereof, per 100 parts by weight of rubber and
E) 10 to 300 parts by weight, preferably 25 to 200 parts by weight, and particularly preferably 25 to 150 parts by weight, of an aromatic polycarbonate and/or polyalkylene terephthalate, per 100 parts by weight of A+B+C+D.
These preferred mixtures (moulding compounds) may be prepared by blending A, B. C, D and E in the molten state, optionally with the addition of the usual additives, until a homogeneous state is achieved.
A Preferred process for preparing these moulding compounds is to mix B, C and D initially and then to blend this mixture with A and E.
In another preferred embodiment the mixture contains additionally:
F) 1 to 40 parts by weight, preferably 2.5 to 30 parts by weight, of a thermoplastic polyurethane.
These mixtures have the following preferred compositions:
A) 10 to 80 parts by weight, preferably 20 to 70 parts by weight, of a thermo-plastic co- or terpolymer, made from the monomers styrene, &agr;-methylstyrene, methyl methacrylate, acrylonitrile, with an average molecular weight ({overscore (M)}
w
) of 70,000 to 150,000, preferably 75,000 to 120,000, most preferably 70,000 to 119,000,
B) 1 to 30 parts by weight, preferably 4 to 20 parts by weight, of a thermoplastic copolymer made from 60 to 95% by weight, preferably 65 to 85% by weight, of styrene and/or &agr;-methylstyrene and 40 to 5% by weight, preferably 35 to 15% by weight, of acrylonitrile with an average weight ({overscore (M)}
w
) of 25,000 to 60,000, preferably 30,000 to 55,000, most preferably 25,000 to 49,500,
C) 0.1 to 5 parts by weight, preferably 0.5 to 2.5 parts by weight, of a thermoplastic co- or terpolymer, made from the monomers styrene, &agr;-methylstyrene, methyl methacrylate, acrylonitrile, with an average molecular weight ({overscore (M)}
w
) of 1,500 to 6,000, preferably 2,000 to 6,000,
D) 0.5 to 50 parts by weight, preferably 1 to 40 parts by weight, in particular 12 to 35 parts by weight, of a particulate grafted rubber with a glass transition temperature of ≦10° C. and an average particle diameter (d
50
) of 0.05 to 0.50 &mgr;m, preferably 0.10 to 0.45 &mgr;m, which contains 15 to 80 parts by weight, preferably 20 to 75 parts by weight, of a chemically bonded polymer made from styrene, methyl methacrylate, acrylonitrile or mixtures thereof, per 100 parts by weight of rubber, and
F) 1 to 40 parts by weight, preferably 2.5 to 30 parts by weight, and particularly preferably 2.5 to 15 parts by weight of a thermoplastic polyurethane.
These Preferred mixtures (moulding compounds) may be prepared by blending A, B, C, D and F in the molten state, optionally with the addition of the usual additives, until a homogeneous state is achieved.
A Preferred process for preparing these materials is to mix B, C and D first and then to blend this mixture with A and F.
Suitable thermoplastic polymers A according to the invention consist of any combinations of polymerised styrene, &agr;-methylstyre

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