Rohm Gmbh

Rohm Gmbh Chemische Fabrik

American Cyanamid Company

Max-planck-gesellschaft Zur F&#xf6;rderung Der Wissenschaften E. V.

Winfried Wunderlich

Werner Siol

Manfred Krieg

Werner Ude

Siegmund Besecke

Armin Meyer

Rainer Friederich

Guenter Schroeder

Manfred Munzer

Frithjof Asmussen

Otto Hitzler

Horst Pennewiss

Heinz Vetter

Ulrich Terbrack

Jens-Dieter Fischer

Peter Quis

Gerhard Markert

Roger J Card

Gunter Schroder

Karl A Jung

Hideto Sotobayashi

Wolfram Schnabel

Daniel Zimmerman

Sidney Binder

August Froelich

Wolfgang Gaenzler

Frank Wenzel

John Milks

Modified rubber compositions comprise by weight about 15-60% of a highly saturated aliphatic rubber such as ethylene-propylene-diene rubber, about 25-80% of acrylate monomer units; and less than about 5% multi-functional monomer units. The compositions exist as amorphous heterogeneously dispersed phases. The first phase comprises the copolymer rubber to which polymers of at least 10% of the other monomer units are grafted. The second phase comprises the other monomers polymerized as homo and copolymers, not grafted to the rubber. Optionally, up to 20% of the composition comprises high index monomer units. The high index monomer units may be copolymerized with the acrylate and grafted to the rubber. Greater than 10% of the monomer units other than rubber are grafted to the rubber. The number average molecular weight of the grafts is between 10,000 and 80,000 daltons. About 2-20% by weight of one or more polymers may be provided to adjust the refractive indices of the rubber or the polyacrylate phase in the final product such that when the composition is present at the 10% rubber level, the haze can be reduced to less than 20%.

Rubber compositions with a high elastic modulus

The invention relates to electrically conducting solid plastics, the conductivity of which is attributable to their containing finely divided particulate, conducting substances. The electrically conducting solid plastics are comprised of or contain a polymer such as polymethyl methacrylate having a discrete fine-particle structure, and the polymer particles of the polymer are 'doped', at least on their surface, with at least one electrically conducting substance such as carbon black in an amount which establishes electrical conductivity. The conducting substance(s) are present in the form of a plurality of conducting particulate solid bodies, and wherein the condition is imposed that the glass temperature (Tg) of the polymer is not exceeded when the conducting substance is mixed with the polymer particles.

Electrically conducting solid plastics

This invention concerns transparent polymer mixtures that can be processed thermoplastically consisting of (A) polycarbonates, particularly Bisphenol A polycarbonates, and (B) copolymers of methyl methacrylate and 5 to 40 wt. % of N-substituted maleimides, with the substituent on the imide nitrogen being an optionally substituted cyclohexyl group, in which the copolymer (B) can also be made up of other .alpha.,.beta.-unsaturated monomer units in amounts of 0 to 40 wt. %.

Compatible polycarbonate/methyl-meth-acrylate polymer mixtures

The invention relates to a method of manufacturing plastic, electrically conductive pressure-formed plates from thermoplastic plastic particles which are mechanically formed. In this method, mechanically formed, thermoplastic particles each particle having maximum particle diameter in the range of about 1 mm to about 10 mm in the middle of said particle, are mechanically mixed with an amount of at least one electric-current-conducting substance sufficient to provide electrical conductivity. The electric-current-conducting substance is furnished in the form of a plurality of particulate, electrically conducting solid bodies, said mixing being effected in the temperature region below the glass temperature (Tg) of the thermoplastic plastic material of which the thermoplastic particles are comprised. The mixture thus produced is compressed to form plastic pressure-formed plates by means of a pressure-forming device.

Method of manufacturing electrically conductive pressure-formed plates

The invention relates to a method of manufacturing plastic, electrically conductive pressure-formed plates from thermoplastic plastic particles which are mechanically formed. In this method, mechanically formed, thermoplastic particles, each particle having maximum particle diameter in the range of about 1 mm to about 10 mm in the middle of the particle, are mechanically mixed with an amount of at least one electric-current-conducting substance sufficient to provide electrical conductivity. The electric-current-conducting substance is furnished in the form of a plurality of particulate, electrically conducting solid bodies, said mixing being effected in the temperature region below the glass temperature (Tg) of the thermoplastic plastic material of which the thermoplastic particles are comprised. The mixture thus produced is compressed to form plastic pressure-formed plates by means of a pressure-forming device.

A method for making thermostable methyl methacrylate/alpha-methylstyrene copolymers having a high heat distortion temperature and adaptable to use as molding compounds by emulsion polymerization of these monomers together with lower alkyl acrylates and/or styrene, the water phase being less than 70 weight percent of the total monomer/water components and the amount of emulsifier being less than 0.5 weight percent of the water component, the copolymer being isolated by freeze coagulation or extruder pinch-off.

Heat resistant molding compounds

Transparent, thermoplastically processible polymer mixtures comprised of:

Compatible mixtures of a polycarbonate and a methacrylate copolymer

A method of producing X-ray resist with etching patterns, using known supports which are coated with a film comprised of copolymers of methacrylonitrile and methacrylic acid is disclosed. This method uses the following protocol.

Method of manufacturing X-ray resist

A radiation sensitive polymeric material comprising a copolymer of methyl methacrylate and allyl methacrylate and at least one organosulfur compound having at least two --SH groups per molecule, said material being useful as a polymer resist sensitive to high energy radiation.

Radiation sensitive polymeric material

Difficultly flammable polyarylene ether resins containing phosphorus having the structure ##STR1## and methods for making the same.

Polyarylene ethers containing phosphorus

What are disclosed are resinous polyarylene esters containing more than 1 percent by weight of phosphorus and having the formula--CO--A--CO--O--B--O.sub.n, wherein B is a bivalent aromatic group and A represents at least in part

Polyarylene esters containing phosphorus

What are disclosed are phosphorus-containing polyarylene esters,

What is disclosed are a method for making a transparent impact-resistant polymer comprising a rubbery phase of grafted polybutadiene and a hard copolymer phase, which polymer is adaptable to use as a molding material, which method comprises:

Making impact resistant polymers

What is disclosed is the polymerization of free radically-polymerizable compounds such as acryl compounds and methacryl compounds under the influence of light having a wave length from 200 nm to 500 nm in the presence of a symmetric azo compound comprising tertiary aliphatic hydrocarbon groups each having a molecular weight of 71 to 97 bound to the azo group, whereby the polymerization temperature can be maintained under 100.degree. C. by regulation of the light intensity.

Photopolymerization method with symmetric azo alkanes

Symmetric azo-bis-mercapto compounds of the formula ##STR1## wherein R.sub.1 and R.sub.2 are methyl or ethyl, R.sub.3 and R.sub.4 are the same or different alkylene having 1 to 4 carbon atoms, and n is 0 or 1, and a method for forming block copolymers of vinyl monomers in a two-step process employing such compounds as polymerization initiators.

Growing community of inventors

Rossdorf, Germany

Winfried Wunderlich