Abstract: Monodisperse crosslinked polymers prepared by seed/feed polymerization have less tendency to tack when a microencapsulated monodisperse crosslinked polymer has been used as seed. Compared with the seed used, the seed/feed polymer obtained exhibits substantially less broadening of the particle size distribution when microencapsulated seed has been used.

Abstract: Polymerizable aromatic carboxylic acids and carboxylic acid anhydrides with cyclic carbonate groups which are useful for improving adhesion of synthetic dental filling materials.

Abstract: The invention relates to urethane acrylates and urethane methacrylates containing cyclic carbonate groups, and use thereof in dental materials and lithographic plates.

Abstract: A condensation product of a hydroxy(meth)acrylate compound corresponding to the formula ##STR1## in which R.sub.1 is hydrogen or methyl, A is a trivalent aliphatic residue with 3 to 15 C-atoms which is unsubstituted or substituted with OH groups and optionally contains up to 5 ether bridges, and an aromatic carboxylic acid anhydrides compound of the formula (II) or an aromatic carboxylic acid anhydride chloride compound of the formula (II) ##STR2## in which Ar is a benzene ring or a naphthalene ring, n is 1 or 2, and m is 0, 1 or 2. The condensation product has a molar mass of 300 and to 10,000 daltons. The condensation product is useful as an adhesive to bond dental filling materials to teeth.

Abstract: A heat-sensitive image recording material contains on a support material1. at least one binder layer with a heat-sensitive imaging combination of an organic silver salt and an organic reducing agent for the organic silver salt, and2. at least one binder layer or a sequence of binder layers with a heat-sensitive imaging combination of an acid-sensitive leuco dye and an acidically reacting compound which acts as a developer for the leuco dye,wherein the leuco dye and developer are in thermal interaction with each other either in different layers or separately from each other in the same layer, characterised in that a layer with a water- or alcohol-soluble polymer is arranged between the combination of organic silver salt and organic reducing agent for the organic silver salt, on the one hand, and the combination of leuco dye and acidically reacting compound, on the other.

Abstract: Novel (meth)acrylates containing fluoroalkenyl groups, of the formula (I) ##STR1## in which R represents hydrogen or methyl,n represents an integer from 2 to 6,A represents a (n+1)-valent hydrocarbon radical having 3 to 30 carbon atoms which optionally contains up to 10 oxygen atoms, andR.sup.1.sub.f and R.sup.2.sub.f independently of one another each represent a perfluoroalkyl radical having 1 to 20 carbon atoms, orR.sup.1.sub.f and R.sup.2.sub.f together form a ##STR2## bridge, in which x represents an integer from 1 to 8, andR.sup.3 represents hydrogen, fluorine, chlorine or a perfluoroalkyl radical having 1 to 20 carbon atoms,a process for their preparation, and their use for the preparation of coatings.

Abstract: The present invention relates to polycyclic phosphoric acid esters of the formula (I) ##STR1## in which L is an n-valent linear or branched aliphatic hydrocarbon residue with 2 to 30 C atoms, which may be OH-substituted and may contain up to 8 ether linkages,Ar is an aryl residue or alkaryl residue andn is 2 to 6,to the use thereof as flame retardants in thermoplastics and to the thermoplastic moulding compounds.

Abstract: Silver halide photographic material comprising finely divided solid spherical polymer beads having an average particle size between about 0.1 and about 10 .mu.m and having a glass transition temperature of at least 40.degree. C. The polymer beads are prepared by a one step reaction in an aqueous reaction medium whereby the polymer beads are formed by the simultaneous reaction of1) a silane monomer comprising an .alpha.,.beta.-ethylenically unsaturated group,2) at least one .alpha.,.beta.-ethylenically unsaturated monomer, different from the silane monomer, capable of forming a polymer that is soluble in the monomer(s) present in the aqueous solvent mixture but which is insoluble in water3) a free radical-forming polymerization initiator that is soluble in the aqueous solvent mixture, and4) a graft-polymerizable polymer containing hydrophilic groups, and capable of forming a graft polymer that remains soluble in the aqueous reaction mixture.

Abstract: A method is provided for the preparation of finely divided solid spherical polymer beads having an average particle size between about 0.1 and about 10 .mu.m and having a glass transition temperature of at least 40.degree. C. The method is a one step reaction in an aqueous reaction medium and said polymer beads are formed by the simultaneous reaction of1) a silane monomer comprising an .alpha.,.beta.-ethylenically unsaturated group,2) at least one .alpha.,.beta.-ethylenically unsaturated monomer, different from said silane monomer, capable of forming a polymer that is soluble in the monomer(s) present in said aqueous solvent mixture but which is insoluble in water3) a free radical-forming polymerization initiator that is soluble in the aqueous solvent mixture, and4) a graft-polymerizable polymer containing hydrophilic groups, and capable of forming a graft polymer that remains soluble in the aqueous reaction mixture.

Abstract: The invention relates to diacrylates and dimethacrylates having cyclic carbonate groups, and their use in dental materials.

Abstract: The present invention provides an imaging element comprising on a support a photosensitive layer containing a photopolymerizable composition containing a urethane type monomer mixture according to the formula (I) as defined in the claims and description. There is further provided a method for obtaining images and/or a lithographic printing plate therewith.

Abstract: In the filling of a buccal area tooth, wherein a polymerizable dental material containing a cross-linked bead poller is filled into the tooth and permitted to set, wherein the bead polymer has an average particle diameter of 2 to 100 .mu.m an inorganic filler content of to 50% by weight and a degree of swelling of 50 to 2000%, measured in THF, and is synthesized fromA: 10 to 78% by weight of C.sub.1 -C.sub.2 -alkyl (meth)acrylateB: 5 to 10% by weight of C.sub.3 -C.sub.12 -alkyl (methacrylate)C: 1 to 30% by weight of cross-linkerD: 10 to 75% by weight of an inorganic filler, andE: 0 to 30% by weight of at least one other ethylenically unsaturated monomer.The cross-linked bead polymer is new, has a solid consistency, is storable and is especially useful for filling teeth in the buccal area.

Abstract: The invention relates to an electrorheological liquid Which consists of an organic polymer as the polarizable disperse phase, an electrically non-conductive, non-aqueous continuous phase and a dispersing agent, and in which the disperse organic polymer has an average particle diameter of between 0.2 and 30 .mu.m and a relative half width value of the particle diameter distribution of below 0.8.

Abstract: The invention relates to diacrylates and dimethacrylates which are derived from cyclohexyldiphenols.Di(meth)acrylates are used widely, for example, as a component of plastic filling materials in dental engineering.

Abstract: A thermosensitive recording material contains a mono-, oligo- or polysaccharide and a catalyst in one or more binder layers arranged on a transparent support. A black-and-white image with high optical density, good grey step reproduction, great sharpness and good stability is formed when the material is heated imagewise, e.g. by means of a thermohead.

Abstract: In an electroviscous liquid comprising a non-aqueous liquid as a dispersion medium, a dispersed particulate polymer and a dispersant, the improvement wherein the polymer contains polyether and (meth)acrylate units.

Abstract: An imaging element is disclosed comprising on a support a dye precursor and a color developer arranged in the same layer or in separate layers characterized in that a specific type of monomers according to one of formulas (I) or (II) and a photoinitiator is present in a layer containing said dye precursor and/or color developer. The imaging element of the invention can used as photosensitive as well as heat-sensitive imaging element for obtaining an image.

Abstract: A method is disclosed for the formation of an image comprising the steps of(1) image-wise exposing, in the presence of a photopolymerizable compound, a photosensitive element comprising a support and at least one photosensitive layer containing a silver halide sensitive to actinic radiation, an organic silver salt and a reducing agent,(2) heating said photosensitive layer while in contact with a receiving element and allowing non-photopolymerized compound in the non-exposed areas to transfer and penetrate in said receiving element, and,(3) separating said receiving element from said photosensitive element.The obtained image can be a useful visible image produced on at least one of the separated elements, or it can be a hydrophobic polymer image on a hydrophilic background formed in the finally separated-receiving element which is usable as a printing plate. In the former embodiment the receiving element comprises a support and a layer containing a pigment, e.g. carbon black.

Abstract: A thermal imaging process comprising the step of imagewise heating a donor element so as to transfer therefrom colored matter onto a contacting receptor element, characterized in that before said imagewise heating said receptor element contains in a layer at least one substance that by heat applied in the transfer of said colored matter undergoes a change giving rise to an increase in optical density.

Abstract: The invention relates to formulations for use as an adhesive component for treatment of tooth hard substance, a process for their preparation and their use.