Abstract: Modified polymers in acid form or in the form of their salts consist ofA) a carboxyl-containing copolymer prepared by emulsion polymerization andB) side radicals introduced therein by partial grafting onto the carboxyl groups and of the general formula I ##STR1## where R.sup.1 and R.sup.2 are each hydrogen or C.sub.1 -C.sub.5 -alkyl, X is oxygen, sulfur or imino, Y is an ester, amide, ether or C.sub.1 -C.sub.10 -alkylene group and 1<n.ltoreq.100 for the average number n of the monomer units undergoing addition per reacted acid function.

Abstract: Novel copolymers of ethylene with .omega.-alkyl-, -cycloalkyl- or -aryl-poly-(alkylene oxide)-.alpha.-yl (meth)acrylates and, if required, .alpha.,.beta.-ethylenically unsaturated carboxylic acids, carboxamides or carboxylic anhydrides and, if desired, further monomers which are copolymerizable with ethylene, selected from the classes consisting of the vinyl esters, vinyl ethers and/or (meth)acrylates.

Abstract: A new liquid cleaner composition is provided for the mild and gentle removal of polymeric materials from sufaces without leaving any residues. The said new cleaner composition is an emulsion of the water-in-oil type comprising an aqueous phase finely dispersed in a continuous phase selected from the group consisting of nonflammable, fire-retardant, high-boiling, and fire-retardant and high-boiling organic phases, the volume ratio of the finely dispersed aqueous phase to the continuous organic phase being in the range of from 90:10 to 10:90. The new liquid cleaner composition can contain alcohols, surface-active agents and further useful additives. The new liquid cleaner composition is most preferably used in the process for preparing photopolymerized flexographic relief printing plates as the developer for washing out the non-irradiated and thus non-photopolymerized areas of the imagewise irradiated relief-forming recording layers of the said flexographic relief printing plates.

Abstract: A novel optically transparent polymer alloy comprisesA) at least one elastomer which contains ethylene and propylene as copolymerized units andB) at least one elastomer which contains ethylene and (meth)acrylic acid as copolymerized units,and is used as a molding material or for the production of molding materials, moldings, films, coatings, adhesives and photosensitive recording elements.

Abstract: A relief printing plate whose photopolymerized relief layer has a non-tacky surface is produced by (1) imagewise exposure of a photopolymerizable relief-forming recording layer which contains one or more polymeric binders containing acid groups, (2) washing out (development) of the unexposed and therefore non-photopolymerized parts of the imagewise exposed relief-forming recording layer with a developer and (3) aftertreatment of the resulting photopolymerized relief layer with a basic aftertreatment solution.

Abstract: A flexographic printing plate which is resistant to ozone cracking and where the flexible recording layer has an anisotropy factor AF of <1.5 is produced from a photosensitive mixture consisting of A) one or more elastomeric binders,B) a mixture ofB1) from 5 to 20% by weight of one or more photopolymerizable organic compounds which are compatible with (A) and contain two or more olefinic double bonds andB2) from 1 to 15% by weight of one or more monoolefinically unsaturated organic compounds which are compatible with (A) and whose homopolymer has a glass transition temperature which is below room temperature,C) from 0.1 to 10% by weight of one or more photoinitiators andD) from 0 to 27% by weight of conventional assistants and additives,the anisotropy factor AF of the flexible recording layer being defined as the ratio of the moduli of elasticity at 100% elongation of strips measuring 2.times.

Abstract: A photosensitive recording material contains a mixture of carboxyl-containing polymers having ethylenically unsaturated side groups, one or more ethylenically unsaturated monomeric compounds, a photoinitiator and a .beta.-aminoalcohol.It is suitable for the production of printing plates.

Abstract: The present invention relates to an improved process for preparing a photopolymerized flexographic relief printing plate or a photoresist from a photosensitive element comprising a photopolymerizable layer consisting essentially of(A) at least one polymer as the binder,(B) at least one photopolymerizable monomer compatible with said binder (A) and(C) one photoinitiator, by(i) imagewise exposing said photopolymerizable layer of said element to actinic light and(ii) washing out the unexposed, non-photopolymerized parts of said layer with a developer, thereby obtaining a photopolymerized flexographic relief printing plate or a photoresist.The improvement of said process comprises: washing out the non-photopolymerized parts of the irradiated photopolymerizable layer with the developer which consists essentially of at least one hydrogenated petroleum fraction having a flashpoint above 45.degree. C. and a boiling range of from 160.degree. to 220.degree. C.

Abstract: In a photosensitive recording material suitable for producing plates or resist patterns, the photopolymerizable recording layer contains as polymeric binder a film-forming copolymer which has a multiphase morphology, one phase having a glass transistion temperature below room temperature and a further phase having a glass transition temperature above room temperature and this copolymer having been obtained by free radical copolymerization of one or more macromers with one or more further olefinically unsaturated copolymerizable organic compounds.

Abstract: A novel light-sensitive recording element for preparing relief plates or relief printing plates comprises a dimensionally stable base and at least one photopolymerizable recording layer (A) consisting essentially of at least one polymer as binder, at least one photopolymerization initiator, at least one photopolymerizable olefinically unsaturated compound (monomer) which is compatible with the polymeric binder, and/or photopolymerizable olefinically unsaturated radicals which are linked internally and/or terminally to the polymeric binder, and at least one additive, the said additive or at least one of the said additives being selected from the group consisting of the lecithins of the general formulae I and II ##STR1## where R.sup.1 and R.sup.2, which may be identical to or different from each other, are each C.sub.11 -C.sub.18 -alkyl or C.sub.11 -C.sub.18 -alkenyl, with the proviso that at least one of R.sub.1 and R.sub.2 is C.sub.11 -C.sub.

Abstract: A novel, improved continuous process for the production of a photosensitive recording element is described, whose photopolymerizable recording layer (A) consists of two or more individual strata (a.sub.n) lying one on top of the other and firmly bonded to one another. The individual strata (a.sub.n) may be of the same or roughly the same composition or of different compositions. In the novel, improved continuous process, the mixtures (a.sub.n) used for the production of the individual strate (a.sub.n) are prepared separately from one another and melted and, as separate molten material streams (a.sub.n), are combined even before entering the nip of a calender, without the said streams mixing as a result of turbulence. During, before or directly after they have been combined, the molten material streams (a.sub.n) are formed into molten sheet-like structures (a.sub.n) lying one on top of the other, without the said streams mixing as a result of turbulence. Thereafter, the molten sheet-like structures (a.sub.

Abstract: In a process for preparing a photopolymer printing plate, relief plate or photoresist from a photosensitive recording element containingA) a photopolymerizable relief-forming layer which can be developed with liquid developer after imagewise exposure to actinic light,B) a top layer which consists of polymers forming films of high tensile strength, adheres firmly to the photopolymerizable relief-forming layer (A) and is soluble or swellable in the liquid developers andC) a cover sheet which can readily be peeled off from the top layer (B),comprising peeling off the cover sheet (C) from the top layer (B), imagewise exposing to actinic light and developing the relief-forming layer (A), the formation of an electrostatic charge on top of the photosensitive recording element being prevented by incorporating into the element a top layer (B) containing specific tertiary amines and/or amides and/or specific quaternary ammonium salts.

Abstract: A light-sensitive recording element useful for preparing photopolymer flexographic relief printing plates, comprising at least one photopolymerizable recording layer having a thickness of from 0.1 to 7 mm and made up of:from 20 to 99.499% by weight of at least one polymeric binder which may be random ethylene-propylene-alkadiene terpolymers having an ethylene content of from 40 to 80% by weight and a double bond content of from 2 to 20 olefinic double bonds per 1,000 carbon atoms;from 0.001 to 10% by weight of at least one photopolymerization initiator,from 0.5 to 50% by weight of at least one monomer which is compatible with the binder and has at least one photopolymerizable olefinic double bond, andfrom 0.001 to 2% by weight of at least one inhibitor of thermally initiated polymerization and from 0.0001 to 5% by weight of at least one antioxidant as assistants.

Abstract: In a photosensitive recording material comprising(A) a photopolymerizable relief-forming layer which can be developed with liquid developer after imagewise exposure to actinic light,(B) a top layer which consists of polymers forming films of high tensile strength, adheres firmly to the photopolymerizable relief-forming layer (A) and is soluble or swellable in the liquid developers and(C) a cover sheet which can readily be peeled off from the top layer (B),the top layer (B) contains specific tertiary amines and/or amides and/or specific quaternary ammonium salts of the type defined in more detail in the claims.Photopolymerized printing plates, relief plates or photoresists are produced by a process in which this recording material is used.

Abstract: A flexographic printing plate which is resistant to ozone cracking and where the flexible recording layer has an anisotropy factor AF of <1.5 is produced from a photosensitive mixture consisting of(A) one or more elastomeric binders,(B) a mixture of(B1) from 5 to 20% by weight of one or more photopolymerizable organic compounds which are compatible with (A) and contain two or more olefinic double bonds and(B2) from 1 to 15% by weight of one or more monoolefinically unsaturated organic compounds which are compatible with (A) and whose homopolymer has a glass transition temperature which is below room temperature,(C) from 0.1 to 10% by weight of one or more photoinitiators and(D) from 0 to 27% by weight of conventional assistants and additives,the anisotropy factor AF of the flexible recording layer being defined as the ratio of the moduli of elasticity at 100% elongation of strips measuring 2.times.

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: In polymer ammonium salts which are formed from a copolymer (A) which can be modified by a polymer-analogous reaction and from one or more amines (B), the copolymer (A) is obtainable by copolymerization of a monomer mixture of(a.sub.1) ethylene,(a.sub.2) acrylic acid and/or methacrylic acid, and(a.sub.3) one or more further monomers from the group consisting of the vinyl esters, vinyl ethers, acrylates, methacrylates, acrylamides and methacrylamides, and the amines (B) are selected from the group consisting of the(b.sub.1) cyclic amines of the general formula I ##STR1## and/or from the group consisting of the (b.sub.2) open-chain amines of the general formula II ##STR2## and/or from the group consisting of (b.sub.3) 1,4-thiazine, N,N',N"-trisvinylmelamine and N,N',N"-triallylmelamine, Z, R.sup.1, R.sup.2 and R.sup.3 having the meanings stated in the description.

Abstract: Mixtures crosslinkable by photopolymerization and based on binders, photopolymerizable monomers compatible therewith and photoinitiators, contain as binders copolymers prepared from (a.sub.1) from 30 to 70% by weight of ethylene, (a.sub.2) from 5 to 40% by weight of (meth)acrylic acid and (a.sub.3) from 5 to 50% by weight of one or more vinyl ester, vinyl ether, (meth)acrylic acid ester and/or (meth)acrylamide.

Abstract: A printing cylinder or a sleeve is coated with a continuous photosensitive recording layer by applying a first jointless stratum of a photosensitive recording layer to the printing cylinder or the sleeve, and uniformly preexposing this first stratum to actinic light and thereafter applying one or more further jointless strata of the photosensitive recording layer to this preexposed first stratum.

Abstract: The invention relates to a novel photosensitive recording material which can be developed in aqueous solvents after its imagewise irradiation with actinic light and which consists essentially of a dimensionally stable base (A) and of a photosensitive recording layer (B). The said photosensitive recording layer (B) contains from about 48 to about 85% by weight, based on the photosensitive recording layer (B) of one or more elastomeric graft copolymers (B1) which are selected from the group consisting of polyalkylene oxide - vinyl ester - graft copolymers whose vinyl ester structural units have been hydrolyzed to a degree of not less 50 mol.-% from about 0.01 to about 10% by weight, based on the photosensitive recording layer (B), of one or more photoinitiators (B2), and from about 5 to about 30% by weight, based on the photosensitive recording layer (B), of one or more photopolymerizable monomers (B3).