US 6,310,140 B1Granted

Thermoplastic elastomers of good dyeability and high strength and elasticity as well as impact-resistant polymer blends produced therefrom

AssigneeBorealis AG

InventorsManfred Raetzsch, Norbert Reichelt, Achim Hesse, Hartmut Bucka, Matthias Stolp, Hans-Joachim Radusch

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Abstract

Thermoplastic elastomers of good dyeability and high strength and elasticity, the incorporated elastomeric particles of which have and average particle diameter of 0.05 to 5 μm. The thermoplastic elastomers are formed according to a method in which mixtures of propylene homopolymers and/or propylene copolymers, elastomeric C4 C12 olefin copolymers and/or terpolymers and C8 to C14 diacrylates, C7 to C16 diallyl compounds, C9 to C15 dimethacrylates, C7 to C10 divinyl compounds, C12 to C17 acrylate esters of polyalcohols, C15 to C21 methacrylate esters of polyalcohols and/or C9 C12 triallyl compounds are added to a melt. The thermoplastic elastomers, as well as mixtures of the thermoplastic elastomers with conventional polyolefins, are suitable for use in the vehicle industry, in the domestic appliances industry, in the construction industry and in medical technology.

Claims13

Dependent claims

Thermoplastic elastomers comprising products of the reaction of:

a) 20 to 80% by weight of propylene homopolymers and/or propylene copolymers;
b) 80 to 20% by weight of elastomeric C4 to C12 olefin copolymers and/or terpolymers;
c) 0.10 to 4.0% by weight, based on the total of the polymers used, of unsaturated monomers from the group consisting of C8 to C14 diacrylates, C7 to C16 diallyl compounds, C9 to C15 dimethacrylates, C7 to C10 divinyl compounds, C12 to C17 acrylate esters of polyalcohols, C15 to C21 methacrylate esters of polyalcohols and C9 to C12 triallyl compounds;
and
d) 0.2 to 4.0% by weight based on the total of the polymers used, of thermally decomposing free radical-forming agents from the group consisting of acyl peroxides, alkyl peroxides, hydroperoxides, peroxycarbonates, peresters, ketone peroxides, peroxyketals and azo compounds,
wherein said thermoplastic elastomers include elastomeric particles having an average particle diameter of 0.05 to 5 μm, and
said reaction comprising reacting the propylene homopolymers and/or propylene copolymers, the elastomeric C4 to C12 olefin copolymers and/or terpolymers, the unsaturated monomers and the thermally decomposing free radical-forming agents in a melt.

4 more elements

A method for the preparation of thermoplastic elastomers comprising the steps of:

a) providing 20 to 80% by weight of propylene homopolymers and/or propylene copolymers;
b) providing 80 to 20% by weight of elastomeric C4 to C12 olefin copolymers and/or terpolymers;
c) providing 0.10 to 4.0% by weight, based on the total of the polymers used, of unsaturated monomers from the group consisting of C8 to C14 diacrylates, C7 to C16 diallyl compounds, C9 to C15 dimethacrylates, C7 to C10 divinyl compounds, C12 to C17 acrylate esters of polyalcohols, C15 to C21 methacrylate esters of polyalcohols and/or C9 to C12 triallyl compounds;
d) providing thermally decomposing free radical-forming agents 0.4 to 4% by weight, based on the sum of the polymers used, of acyl peroxides, alkyl peroxides, hydroperoxides, peroxycarbonates, peresters, ketone peroxides, peroxyketals and/or azo compounds;
and
e) reacting components a), b),c) and d) in a continuous kneader in a melt at mass temperatures of 150° to 300° C. and at residence times of 1 min to 35 min to form elastomeric particles in the thermoplastic elastomer having an average particle diameter of 0.05 to 5 μm.

3 more elements

Dependencies are inferred from the claim text.