摘要:
Adhesive component formulations containing (meth)acrylic acid esters, containing formamide groups, and optionally an initiator, which are used as an adhesive component for the treatment of collagen-containing materials.
摘要:
A dental adhesive comprising a (meth)acryloylaminoalkyl carboxylate of the formula ##STR1## in which R.sup.1 represents hydrogen or methyl;R.sup.2 represents methylene or ethylene; andR.sup.3 represents hydrogen, methyl, or ethyl;and at least one of an initiator, a non-toxic solvent, and a filler. The dental adhesive is useful to effect a strong adhesive bonding of dental materials to collagen-containing materials.
摘要:
For filling and forming teeth, novel (meth)acrylic acid derivatives of triisocyanates of the formula ##STR1## wherein R.sup.1 and R.sup.2 are identical or different and stand for hydrogen or a lower alkyl radical,R.sup.3, R.sup.4 and R.sup.5 are identical or different and denote hydrogen or methyl,y.sup.1 to y.sup.3 are identical or different and denote divalent straight-chain or branched hydrocarbon radicals of 2 to 15 carbon atoms which may optionally include 1 to 3 oxygen bridges and which may be unsubstituted or substituted by 1 to 4 additional (meth)acryloyloxy radicals,X.sup.1 to X.sup.3 are identical or different and denote --NR.sup.1 -- or --O--, at least one of the radicals X.sup.1 to X.sup.3 denoting --NR.sup.1 --, and the ringsA and B are identical or different and may be aromatic or saturated.
摘要:
Crosslinked bead polymers having an average particle diameter in the range of from 0.5-10 .mu.m and a narrow particle size distribution can be prepared by polymerization of vinyl monomers and silane monomer units which contain a hydrolysable group, the polymerization being carried out in a non-aqueous, polar medium using a free-radical former as the initiator in the presence of a polymer which is soluble in this medium and acts as a dispersant, and furthermore in the presence of a low molecular weight surfactant, and the resulting polymer is then crosslinked by the action of an aqueous acid or base.
摘要:
The present invention relates to a method for the demineralization of water using a combination of a monodisperse cation filter operated as a lift bed and a monodisperse anion filter operated in the cocurrent flow procedure, and also devices which comprise such a lift bed in combination with at least one cocurrent flow filter and if appropriate a trickling degasser and/or a mixed-bed filter.
摘要:
The present invention relates to a process for the preparation of silver-containing polymer beads, characterized in that I) a mixture of a) styrene b) crosslinker c) organic silver salt d) free-radical initiator and, if appropriate, e) inerting agent is produced, and II) the resultant mixture is cured in an aqueous phase at an increased temperature to form polymer beads.
摘要:
A method for preparing encapsulated red phosphorus is disclosed. The method entails obtaining a material system that contains dispersed particulate red phosphorus having a mean particle size of 0.1 to 100 μm in an aqueous phase that comprise urea, formaldehyde and a water-soluble silicon dioxide precursor, adding to the material system a sufficient amount of acid to lower the pH to 0 to 5 and maintaining the resulting acidic system at a temperature of 80 to 120° C. for a period longer than one hour. The encapsulated red phosphorus of the invention is suitable for using as a flame retarding agent for plastics molding compositions.
摘要:
The present invention relates to shaped articles which release agrochemical active compounds, are used for treatment of woody plants and are employed in a hollow preformed in the woody plant, are of a volume which fills the volume of the hollow to the extent of 10 to 95%, are of a volume which does not increase during the period of use to the extent that the preformed hollow space is filled completely, comprise a) agrochemical active compounds, b) water-insoluble thermoplastically processable polymers, c) water-soluble polymers and d) if appropriate further auxiliaries.
摘要:
The present invention relates to shaped articles which release agrochemical active compounds, are used for treatment of woody plants and are employed in a hollow preformed in the woody plant, are of a volume which fills the volume of the hollow to the extent of 10 to 95%, are of a volume which does not increase during the period of use to the extent that the preformed hollow space is filled completely, comprise a) agrochemical active compounds, b) water-insoluble thermoplastically processable polymers, c) water-soluble polymers and d) is appropriate further auxiliaries.
摘要:
This invention relates to spherical methyl methacrylate copolymers with an average particle size of 6 to 50 .mu.m and a narrow particle size distribution, and to a method of producing them. The invention further relates to the use of these spherical copolymers for the production of 3-D models by laser sintering.