摘要:
A polyurethane corresponding to the formula: ##STR1## wherein Q is a divalent, mononuclear or dinuclear aromatic radial which is unsubstituted or is substituted by lower alkyl groups and which can contain, as a linking member, a lower alkylene group,X is one of the groups --O--Ph--Z--Ph--O-- and --OOC--(CH.sub.2).sub.y --COO--,Ph being an optionally substituted phenylene group,Z being an alkylene group having 1-4 carbon atoms and y being a number from 2 to 12,R is a hydrogen atom or a methyl group,Y is an alkylene radical having 2-6 carbon atoms,m is an integer from 4 to 50n is an integer from 1 to 6 ando is an integer from 4 to 20having the properties of thermoplasts and being hardenable to give elastic products. It is suitable for use as a hardenable constituent of photopolymerizable materials.
摘要:
A polyurethane corresponding to the formula: ##STR1## wherein Q is a divalent, mononuclear or dinuclear aromatic radial which is unsubstituted or is substituted by lower alkyl groups and which can contain, as a linking member, a lower alkylene group,X is one of the groups --O--Ph--Z--Ph--O-- and --OOC--(CH.sub.2).sub.y --COO--,Ph being an optionally substituted phenylene group,Z being an alkylene group having 1--4 carbon atoms andy being a number from 2 to 12,R is a hydrogen atom or a methyl group,Y is an alkylene radical having 2-6 carbon atoms,m is an integer from 4 to 50n is an integer from 1 to 6 ando is an integer from 4 to 20having the properties of thermolasts and being hardenable to give elastic products. It is suitable for use as a hardenable constituent of photopolymerizable materials.
摘要:
A radiation-polymerizable mixture comprising a compound having at least two terminal ethylenically unsaturated groups which can form a crosslinked polymer by means of free-radical initiated addition polymerization, a polymeric binder, a radiation activatable polymerization initiator, and a compound having two epoxy groups in the molecule and a molecular weight of not more than 1,500; and a photopolymerizable copying material having a flexible transparent temporary support and a transferrable thermoplastic photopolymerizable layer comprising the above-described radiation-polymerizable mixture.
摘要:
The present invention relates to a radiation-polymerizable mixture which includes a polymerizable compound, a polymeric binder which has units of methacrylic acid, a methacrylic acid ester and a styrene, the latter in a proportion of 40 to 65% by weight, a finely divided mineral pigment on a silicic acid or silicate basis, a photopolymerization initiator, a compound having at least two epoxy groups in its molecule and a thermal hardener for epoxy groups. The mixture is advantageous, in particular, for producing solder masks and can be cured after exposure to an image and development by heating to about 80.degree. to 150.degree. C. to form a stencil which is resistant under soldering conditions.
摘要:
The present invention relates to a radiation-polymerizable mixture which includes a polymerizable compound, a polymeric binder which has units of methacrylic acid, a methacrylic acid ester and a styrene, the latter in a proportion of 40 to 65% by weight, a finely divided mineral pigment on a silicic acid or silicate basis, a photopolymerization initiator, a compound having at least two epoxy groups in its molecule and a thermal hardener for epoxy groups. The mixture is advantageous, in particular, for producing solder masks and can be cured after exposure to an image and development by heating to about 80.degree. to 150.degree. C. to form a stencil which is resistant under soldering conditions.
摘要:
A process and an aqueous treatment solution for cleaning copper surfaces, in particular for removing residues of photoresist layers, which residues still adhere after development to the cleared copper areas, are described. The solution contains a water-soluble aliphatic sulfonic acid having 8 to 30 carbon atoms or a water-soluble salt thereof.
摘要:
The present invention relates to a photosensitive transfer material, which comprises a flexible temporary support film which is preferably transparent, a thermoplastic photosensitive layer, optionally a flexible cover film on the free side of the photosensitive layer and, optionally, an intermediate layer between the support film and the photosensitive layer. The photosensitive transfer material is suitable for manufacturing photoresist stencils and solder masks. The temporary support film has a rough surface which exerts an embossing effect on the surface of the photosensitive layer and the intermediate layer, respectively. The mat-finish of the intermediate layer prevents an irregular deformation of this layer in moist air, while the mat-finish of the photosensitive layer precludes unwanted reflections.
摘要:
A radiation-sensitive composition is disclosed which comprises: (a) a polymeric binder comprised of an alkenyl phenol monomer; (b) a compound which forms a strong acid under the action of actinic radiation; and (c) a compound which contains at least one acid-cleavable C-O-C bond and has a solubility in a liquid developer which is increased by the action of acid. The composition yields positive-working recording layers which are more flexible than layers comprising known novolak binders.
摘要:
The present invention relates to thermoplastic moulding compositions of (A) 99.5 to 80% by weight, of at least one amorphous linear polyamide and (B) 0.5 to 20% by weight of at least one segmented thermoplastic elastomeric copolyester. These novel moulding compositions combine good toughness and hardness with good elongation and stiffness properties as well as good flowing properties of the molten material.
摘要:
The specification discloses flame retarding plastic materials which contain, as the flame retarding agent, a phosphinic, diphosphinic or tri-phosphinic acid derived from 2-alkyl-2,5-dioxo-1,2-oxaphospholane and an organic monoamine or diamine or triamine, respectively.