Thermoplastic elastomer and a process for its production
AssigneeMitsubishi Petrochemical Co., Ltd.
InventorsSadao Kitagawa, Mitushige Baba
Life of this patent
Estimating the term…
Abstract
A thermoplastic elastomer comprising 55-90 parts by weight of a crosslinked acrylic rubber having a glass transition temperature of 0.degree. C. or lower and 45-10 parts by weight a copolymer of a methacrylate ester with a maleimide, which has a glass transition temperature of 110.degree. C. or higher. This thermoplastic elastomer may be produced by a first step of polymerizing an acrylic ester in the presence of a polyfunctional monomer with or without a chain transfer agent and a second step of adding a methacrylate ester and a maleimide to the resulting acrylic rubber to carry out copolymerization.
Claims9
A process for producing a thermoplastic elastomer which comprises:
- polymerizing an acrylic ester in the presence of a polyfunctional monomer having in its molecule at least two ethylenically unsaturated bonds, thereby forming a crosslinked acrylic rubber having a glass transition temperature of 0.degree. C. or lower in an amount of 55-90 parts by weight per 100 parts by weight of the final polymer composition;
- and
- adding a methacrylate ester and a maleimide to the acrylic rubber so as to carry out copolymerization, thereby forming a methacrylate ester/maleimide copolymer having a glass transition temperature of 110.degree. C or higher in an amount of 45-10 parts by weight per 100 parts by weight of the final polymer composition.
A process for producing a thermoplastic elastomer which comprises:
- polymerizing an acrylic ester at a temperature of 0.degree.-30.degree. C. in a heterogeneous polymerization system using water as a medium in the presence of a polyfunctional monomer having in its molecule at least two ethylenically unsaturated bonds, thereby forming a crosslinked acrylic rubber having a glass transition temperature of 0.degree. C. or lower in an amount of 55-90 parts by weight per 100 parts by weight of the final polymer composition;
- and
- adding a methacrylate ester and a maleimide to the acrylic rubber so as to carry out copolymerization, thereby forming a methacrylate ester/maleimide copolymer having a glass transition temperature of 110.degree. C. or higher in an amount of 45-10 parts by weight per 100 parts by weight of the final polymer composition.
A process for producing a thermoplastic elastomer which comprises:
- polymerizing an acrylic ester at a temperature of 0.degree.-100.degree. C. in a heterogeneous polymerization system using water as a medium in the presence of a polyfunctional monomer having in its molecule at least two ethylenically unsaturated bonds and a chain transfer agent, thereby forming a crosslinked acrylic rubber having a glass transition temperature of 0.degree. C. or lower in an amount of 55-90 parts by weight per 100 parts by weight of the final polymer composition;
- and
- adding a methacrylate ester and a maleimide to the acrylic rubber so as to carry out copolymerization, thereby forming a methacrylate ester/maleimide copolymer having a glass transition temperature of 110.degree. C. or higher in an amount of 45-10 parts by weight per 100 parts by weight of the final polymer composition.
Dependencies are inferred from the claim text.