Abstract: An arrangement is provided for fixing components of an optical system such as lenses, mounting rings, and the like. The components which are guided radially in the tube are held in the axial direction under pretensioning in an elastic manner. The arrangement is designed for fixing components in the axial direction in which the pretensioning force can be varied in definable steps. This is done by providing that a detachable fastening ring and also the tube have catch elements at concentric circumferential surfaces, which catch elements are constructed as complementing locking elements. Under axially directed force, the catch elements of the fastening ring can be engaged in the catch elements at the tube and the catch elements can be disengaged in the opposite force direction. The pretensioning force which is exerted by the fastening ring on the components to be held depends upon the extent to which the catch elements of the fastening ring and of the tube overlap.

Abstract: The invention provides a novel photosensitive recording material in the shape of a multilayer element comprising(i) a photopolymerizable or photocrosslinkable relief-forming layer (RL) of a thickness from 0.1 to 6000 .mu.m and(ii) a dimensionally stable support layer.The said relief-forming layer (RL) consists essentially of an ionic polymer, of one or more photoinitiators and, if desired, of one or more photopolymerizable monomers.The said ionic polymer contains(A) from about 45 to 90% by weight, based on the ionic polymer, of a polymer main chain formed from an alkadiene polymer A',(B) from about 6 to about 45% by weight, based on the ionic polymer, of one or mored olefinically unsaturated side radicals having the structure (I), ##STR1## where R.sup.1 and R.sup.2 are different and are each H or a carbon atom of A',R.sup.3 is a polyvalent, straight-chain or branched C.sub.1 -C.sub.

Abstract: A photosensitive recording element which is suitable for the production of printing plates or resist images, possesses a photopolymerizable recording layer which is applied to a dimensionally stable base, can be developed in an aqueous alkaline medium and contains, as a polymeric binder, one or more film-forming copolymers which are insoluble in water but soluble or dispersible in aqueous alkaline solutions and consist of from 10 to 50% by weight of one or more hydroxyalkyl (meth)acrylates, from 8 to 30% by weight of acrylic acid and/or methacrylic acid and from 30 to 80% by weight of one or more alkyl (meth)acrylates, some of the carboxyl groups of the copolymer being esterified by reaction with glycidyl (meth)acrylate.

Abstract: A photosensitive recording element which is suitable for the production of printing plates or resist images possesses a photopolymerizable recording layer which is applied to a dimensionally stable base, can be developed in an aqueous alkaline medium and contains, as a polymeric binder, one or more film-forming copolymers which are insoluble in water but soluble or dispersible in aqueous alkaline solutions and consist of from 10 to 50% by weight of one or more N-vinylamides, from 8 to 30% by weight of acrylic acid and/or methacrylic acid and from 30 to 80% by weight of one or more hydrophobic comonomers which, as such, form homopolymers which are insoluble in water and aqueous alkaline solutions, some of the carboxyl groups of the copolymer being esterified by reaction with glycidyl (meth)acrylate.

Abstract: Oligomeric resins are crosslinkable by polymerization, soluble or dispersible in aqueous alkaline solutions, preferably contain more than 2 (meth)acryloyl groups and free carboxyl groups and are prepared by a special process. Photosensitive, photopolymerizable and crosslinkable recording materials for optical information fixing are based on these oligomeric resins, and lithographic printing plates are produced by a process in which the novel photosensitive recording materials are used.

Abstract: A photosensitive recording material, in particular for the production of lithographic printing plates or resist images, possesses a photosensitive, photopolymerizable or electrophotographic recording layer which can be washed out with an aqueous, in particular aqueous alkaline, medium, the said recording layer containing, as a polymeric binder, a copolymer which is soluble or dispersible in the aqueous, in particular aqueous alkaline, medium and which contains, as a comonomer, an anhydride of a polymerizable, ethylenically unsaturated monocarboxylic acid in an amount of from 0.05 to 2% by weight, based on the copolymer, as copolymerized units.

Abstract: For the production of printing plates, in particular lithographic printing plates by exposing a photopolymerizable recording material imagewise to actinic light and then effecting development with an aqueous alkaline developer, it is proposed to use photopolymerizable recording materials possessing a photopolymerizable copying layer (L) applied on a dimensionally stable base, where, in addition to containing ethylenically unsaturated photopolymerizable low molecular weight compounds, one or more photoinitiators, dyes and/or pigments, and, if required, further additives and/or assistants, the said copying layer (L) also contains, as a binder, one or more oligomeric and/or relatively high molecular weight copolymers which are soluble or dispersible in aqueous alkaline media and are based on cyclic dienes, in particular unsubstituted or substituted cyclopentadiene or unsubstituted or substituted di- or tricyclopentadiene.