A hardener system for a synthetic resin composition having free-radical-polymerisable compounds, which includes the following constituents: a) at least one activator in the form of a metal salt, and as free-radical starter b1) (i) at least one aldehyde and/or ketone and at least one primary amine, and/or b2) (ii) at least one aldimine or (iii) at least one ketimine, or a mixture of two or more of constituents (i) to (iii). In addition, synthetic resin compositions having such a hardener system for application especially in fixing technology, and subject matters related thereto.

A hardener system for a synthetic resin composition having free-radical-polymerisable compounds, which includes the following constituents: a) at least one activator in the form of a metal salt, and as free-radical starter b1) (i) at least one aldehyde and/or ketone and at least one primary amine, and/or b2) (ii) at least one aldimine or (iii) at least one ketimine, or a mixture of two or more of constituents (i) to (iii). In addition, synthetic resin compositions having such a hardener system for application especially in fixing technology, and subject matters related thereto.

The present invention provides a cationically curable resin composition for assembling hard disk devices which comprises a resin having a cationically polymerizable functional group (a component A) and a cationic polymerization initiator (a component B), the component B being at least one selected from the group consisting of X.sup.+(SbF.sub.6).sup.(B1), X.sup.+(B(C.sub.6F.sub.5).sub.4).sup.(B2) and X.sup.+((Rf).sub.nPF.sub.6-n).sup.(B3) (in the formulae, X.sup.+ is iodonium or sulfonium, Rf is a fluorinated alkyl having 1 to 6 carbon atoms, and n is an integer of 1 to 6). The invention also provides a hard disk device manufacturing method using the composition, and a hard disk device assembled with the composition.

The present invention provides a cationically curable resin composition for assembling hard disk devices which comprises a resin having a cationically polymerizable functional group (a component A) and a cationic polymerization initiator (a component B), the component B being at least one selected from the group consisting of X.sup.+(SbF.sub.6).sup.(B1), X.sup.+(B(C.sub.6F.sub.5).sub.4).sup.(B2) and X.sup.+((Rf).sub.nPF.sub.6-n).sup.(B3) (in the formulae, X.sup.+ is iodonium or sulfonium, Rf is a fluorinated alkyl having 1 to 6 carbon atoms, and n is an integer of 1 to 6). The invention also provides a hard disk device manufacturing method using the composition, and a hard disk device assembled with the composition.

A method of preparing an EPDM copolymer by solution polymerization using a Ziegler-Natta catalyst system, in which the Ziegler-Natta catalyst system includes VOCl.sub.3, ethylaluminum sesquichloride (EASC), and a straight chain or branched chain C4-C6 alkyl amine as a catalyst modifier. The method includes performing polymerization by adding the catalyst modifier before injecting VOCl.sub.3 or by adding VOCl.sub.3 and the catalyst modifier simultaneously.

A method of preparing an EPDM copolymer by solution polymerization using a Ziegler-Natta catalyst system, in which the Ziegler-Natta catalyst system includes VOCl.sub.3, ethylaluminum sesquichloride (EASC), and a straight chain or branched chain C4-C6 alkyl amine as a catalyst modifier. The method includes performing polymerization by adding the catalyst modifier before injecting VOCl.sub.3 or by adding VOCl.sub.3 and the catalyst modifier simultaneously.

Disclosed herein are EPDM-diene copolymers that have a low molecular weight and are liquid at room temperature. In a specific embodiment, the method of making the copolymer includes: adding a solvent to a reactor; adding a propylene and a catalyst mixture to the solvent in the reactor to make a first reaction mixture, where the catalyst mixture includes: one or more catalysts, one or more cocatalysts, and one or more catalyst reactivators; contacting an ethylene to the first reaction mixture to make a second reaction mixture; and contacting a vinyl norbornene to the second reaction mixture to make a copolymer, where the copolymer has a molecular weight from about 2,500 g/mol to about 1,000,000 g/mol, and where the copolymer has a viscosity from about 1,000 cP to about 2,500,000 cP at 100 C.

Disclosed herein are EPDM-diene copolymers that have a low molecular weight and are liquid at room temperature. In a specific embodiment, the method of making the copolymer includes: adding a solvent to a reactor; adding a propylene and a catalyst mixture to the solvent in the reactor to make a first reaction mixture, where the catalyst mixture includes: one or more catalysts, one or more cocatalysts, and one or more catalyst reactivators; contacting an ethylene to the first reaction mixture to make a second reaction mixture; and contacting a vinyl norbornene to the second reaction mixture to make a copolymer, where the copolymer has a molecular weight from about 2,500 g/mol to about 1,000,000 g/mol, and where the copolymer has a viscosity from about 1,000 cP to about 2,500,000 cP at 100 C.