Abstract: A process for preparing pressure-sensitively adhesive polyacrylates by free-radical addition polymerization, characterized in that mercapto-functionalized photoinitiators of the general formula (I) and/or (II).

Abstract: A method for producing cross-linked polyacrylates, wherein a polymer is produced by copolymerizing an acrylate-based monomer mixture and the polymer is cross-linked by means of UV radiation, wherein up to 10 wt % of the monomers have one or more epoxy and/or hydroxyl groups which are incorporated into the polymer during copolymerization, and wherin at least one photocaton generator and one or more di-or multifunctional epoxides and/or alcohols are added to the polymers before cross-linking.

Abstract: The invention relates to a method for producing a polyacrylate adhesive compound by a hot-melt method. The inventive method is characterized in that a polyfunctional &agr;-splitting agent which is present as an oligomer is added to the polymer to be crosslinked prior to the hot-melt method and UV crosslinking is carried out after treatment in the hot-melt method.

Abstract: The use of a pressure sensitive adhesive possessing anisotropic properties for producing punched products.

Abstract: Crosslinked polyacrylates obtained by crosslinking, induced by means of UV radiation, of a polymer mixture comprising a) polyacrylate copolymers of the following monomers a1) acrylic acid and/or acrylic esters of the following formula CH2═CH(R1)(COOR2), where R1═H or CH3 and R2 is an alkyl chain having 1-20 carbon atoms, at 70-99% by weight, based on component (a), a2) olefinically unsaturated monomers containing functional groups, at 0-15% by weight, based on component (a), a3) tert-butyl acrylate, at 1-15% by weight, based on component (a), and b) a photocationic initiator at 0.01-25% by weight, based on the overall polymer mixture.

Abstract: An oriented pressure sensitively adhesive system comprising a pressure sensitive adhesive which is comprised of at least one block copolymer composed at least in part of (meth)acrylic acid derivatives, and at least one block copolymer comprising the unit P(A)-P(B)-P(A), where P(A) independently of one another represent homopolymer blocks or copolymer blocks of monomers A, the polymer blocks P(A) each having a softening temperature in the range from +20° C. to +175° C., P(B) represents a homopolymer block or copolymer block of monomers B, the polymer block P(B) having a softening temperature in the range from −130° C. to +10° C., wherein the refractive index nMD measured in one direction is greater than the refractive index nCD measured in a direction perpendicular to that direction.

Abstract: A pressure sensitive adhesive obtainable by free-radical polymerization, characterized in that

Abstract: In a continuous two-stage process for preparing solvent-free polyacrylate hotmelt pressure sensitive adhesives which is gentle on the polymer and redeploys the solvent used in the process the following steps are carried out:

Abstract: The use of macromonomers which

Abstract: A pressure sensitive adhesive comprising a P(A/C)-P(B)-P(A/C) block copolymer, wherein P(B) is a polymer formed from component B and component B comprises at least one monomer B1, P(B) having a glass transition temperature not higher than 0° C., P(A/C) represents a copolymer block of component A/C, which comprises at least two monomers A1 and C1, P(A/C) having a glass transition temperature of 20° C.-175° C. and C1 comprises at least one cross-linking-enabled functional group.

Abstract: A pressure sensitive adhesive based on block copolymers, said block copolymers having at least one unit composed of three successive polymer blocks, said three successive polymer blocks being chosen in alternation from the group of the polymer blocks P(A) and P(B), wherein P(A) represents a homopolymer or copolymer block obtainable from a component A which is composed of at least two monomers A1, A2, the polymer block P(A) having a softening temperature of from −80° C. to 0° C.

Abstract: A pressure sensitive adhesive based on block copolymers which have at least one unit composed of a series of three alternating polymer blocks P(A) and P(B), wherein P(A) represents a homopolymer or copolymer block formed from a component A which itself comprises at least one acrylated macromonomer of general formula CH2═CH(RI)(COORII)  (I) in which RI′=H or CH3 and R″ is an aliphatic linear, branched or cyclic, unsubstituted or substituted, saturated or unsaturated, alkyl radical having more than 30 carbon atoms, and the average molecular weight Mn of said at least one macromonomer being between 492 g/mol and 30 000 g/mol, P(B) represents a homopolymer or copolymer block formed from a monomeric component B which itself comprises at least one monomer B1, the polymer block P(B) having a softening temperature of from −80° C. to +20° C., and the polymer blocks P(A) being immiscible with the polymer blocks P(B).

Abstract: The invention relates to an adhesive material based on block copolymers of general type P(B)-P(A/C)-P(B). wherein each block copolymer consists of a central copolymer block P(A/C) and terminal polymer block P(B). The invention is characterised in that P(A/C) represents a copolymer from monomers A anid C, which has a glass transition temperature of 0° C.-80° C. wherein component C contains at least one functional group which behaves in an inert manner in a radical polymerisation reaction, and which is used to increase the cohesion of said block copolymer: P(B) represents a polymer from monomers B, which has a glass transition temperature of 20° C.-175° C.; the polymer-block P(B) is insoluble in the copolymer-block P(A/C), and P(A/C) are unmixable.

Abstract: The invention relates to a pressure sensitive adhesive (PSA) tape and to a process for crosslinking PSA on backing materials which are more resistant to electron beams. The process is distinguished by a backing material which has been modified with one or more very thin layers of one or more conductive materials. During EB crosslinking the accelerated electrons penetrate the adhesive and the backing material and are dispersed over the entire backing material, or braked, at the electrically conductive layer. The damage to the backing which occurs at high EB doses is thereby minimized.

Abstract: The invention relates to a method for the production of cross-linked acrylate contact adhesive materials characterised in that polyacrylates are firstly produced from the following monomers by free-radical (co-)polymerisation: (d) acrylic and methacrylic acid monomers with the following structure, where R1═H or CH3 and R2=an alkyl chain with 2-20 C atoms, at a proportion of 45 99.5 wt. % of the monomer mixture, (e) one or several carboxylic acid anhydrides, containing olefinic double bonds, at a proportion of 0.5-25 wt. % of the monomer mixture, (f) further unsaturated olefinic monomers containing functional group A, at a proportion of 0-30 wt. % of the monomer mixture. The polymers thus produced are concentrated to give a polyacrylate material with a solvent content ≦2 wt.

Abstract: A process for producing pressure-sensitively adhesive punched products from backing material coated with pressure sensitive adhesive, wherein

Abstract: A process for producing pressure-sensitively adhesive punched products from backing material coated with pressure sensitive adhesive, wherein

Abstract: The invention relates to a method for the production of a contact adhesive material based on acrylates, characterised in that a) firstly, (co-) polymers are produced by free radical polymerisation from the following monomers: i) a mixture of acrylic monomers, or of acrylic and vinylic monomers, ii) monomers, which contain vinyl groups and with at least one other functional group which is unreactive with relation to radical polymerisations and which is chosen such that it may participate in polymerisation-like reactions with isocyanate groups, making up from 0.1 to 25 wt. % of the monomer mixture, b) by means of a further reaction under addition of isocyanatoethyl acrylate and/or isocyanatoethyl methacrylate, double bonds are introduced along the polymer chain and c) a cross-linking of the polymers is achieved by means of irradiation with energetic radiation after the reaction between the functional groups and the isocyanate groups.

Abstract: A method of reducing the flow viscosity of a polyacrylate composition, which comprises adding a) to a polyacrylate, a polyacrylate copolymer, a polyacrylate mixture or a mixture of polyacrylates and polyacrylate copolymers having an average molecular weight of more than 500000 g/mol b) a polyacrylate, a polyacrylate copolymer, a polyacrylate mixture or a mixture of polyacrylates and polyacrylate copolymers having an average molecular weight of less than 500000 g/mol, component (b) possessing functional groups crosslinkable by UV irradiation.

Abstract: A pressure sensitive adhesive system for reversible bonds, comprising at least one pressure sensitive adhesive based on at least one block copolymer, the weight fractions of the block copolymers accounting in total for at least 50% of the pressure sensitive adhesive, at least one block copolymer being composed at least in part on the basis of (meth)acrylic acid derivatives, additionally at least one block copolymer comprising at least the unit P(A)-P(B)-P(A) composed of at least one polymer block P(B) and at least two polymer blocks P(A), the polymer blocks P(A) each having a softening temperature in the range from +20° C. to +175° C., and the polymer block P(B) having a softening temperature in the range from −130° C. to +10° C.