Abstract: An AB type-block copolymer of the formula: ##STR1## wherein R.sup.1 is a hydrocarbon group having 1 to 10 carbon atoms; R.sup.2 is a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms; R.sup.3 is a benzyl group, an alkyl group having 1 to 18 carbon atoms or ##STR2## wherein R.sup.4 is an alkyl group having 1 to 18 carbon atoms; M represents a fluorine-containing AB-type block copolymer having a fluorine-containing polymer chain and a polymer chain having affinity for a resin.

Abstract: The invention relates to an accelerated photoiniferter polymerization method which involves the addition of a polymerization accelerating amount of a at least one metal compound accelerator during the photoiniferter polymerization process.Preferably, the metal compound or compounds used are represented by the general formula M.sub.x L.sub.z whereinM is a cation having a valency of z of a metal which is selected from the group consisting of tin, zinc, cobalt, titanium, palladium, and lead;x is an integer of at least 1;L is an anion having a valency of x which is selected from the group consisting of C.sub.1-20 alkyl, -aryl, --OR, ##STR1## NO.sub.3.sup.--, SO.sub.4.sup..dbd., and PO.sub.4.sup.-3 ; R is selected from the group consisting C.sub.1-20 alkyl and aryl; andz is an integer of at least 1.Most preferably, the metal compound is selected from the group consisting of stannous 2-ethylhexanoate, zinc 2-ethylhexanoate and mixtures thereof.

Abstract: The present invention provides novel siloxane iniferter compounds, block copolymers made therewith, and a method of making the block copolymers. The siloxane iniferter compounds can be represented by the formula ##STR1## wherein T and X are organic groups selected so that the T-X bond is capable of dissociating upon being subjected to an appropriate energy source to form a terminator free radical of the formula T and an initiator free radical.r.sub.1, R.sub.2, R.sub.5 and R.sub.6 are monovalent moieties selected from the group consisting of hydrogen, C.sub.1-4 alkyl, C.sub.1-4 alkoxy and aryl which can be the same or are different;R.sub.3 and R.sub.4 are monovalent moieties which can be the same or different selected from the group consisting of hydrogen, C.sub.1-4 alkyl, C.sub.

Abstract: A photopolymerizable composition comprising a vinyl monomer, a mercaptocarboxylic acid/.alpha.-diketone photopolymerization initiator and a storage stabilizer. The composition may admit of a filler, and exhibits excellent mechanical strength, storage stability, color and resistance to coloring, and availability.

Abstract: Substituted dibenzalketones useful as water-soluble photoinitiators have the formula: ##STR1## wherein R.sup.1 and R.sup.2 are 4, alkyl or, taken together, an aliphatic ring, n=0 or an integer and R.sup.3 and R.sup.4 either are both water-solubilizing groups (a) --X(CH.sub.2).sub.m N.sup.+ R.sup.5.sub.3, (b) --X(CH.sub.2).sub.m COO.sup.- M or (c) --X(CH.sub.2).sub.m SO.sup.-.sub.3 M.sub.5 or one is such a group and the other is (d) a group --NR.sup.5.sub.2, X is --CH.sub.2 --, --O-- or --S--, R.sup.5 is an alkyl group, M is H.sup.+ or a metal cation and m=0. Such a photoinitiator compound is associated with a polymerizable compound in an aqueous photopolymerizable composition.

Abstract: A photosolubilizable composition containing (a) a first compound capable of producing an acid by irradiation with actinic rays and (b) a high molecular weight compound, whose solubility in a developing solution is increased by the action of an acid, and a photosolubilizable composition containing (c) a high molecular weight compound whose solubility in a developing solution is increased by irradiation with actinic radiation, are disclosed. These compositions exhibit high photosensitivity, broad development latitude, and high stability with time.

Abstract: Radiation sensitive compositions comprising acrylic or methacrylic acid esters with decreased oxygen inhibition attained by use of minor amounts of N,N'-diorgano dicarboxamide additives. The acrylated ester compositions are suitable for ultraviolet curable coatings.

Abstract: There is disclosed a resin composition comprising(A) a spiro ortho ester compound and/or a spiro ortho carbonate compound;(B) an aluminum compound; and(C) a silanol compound or a silicon compound which is capable of generating a silanol group;the amounts of components (B) and (C) being within the range of 0.001 to 10% by weight and 0.1 to 20% by weiht, based on the amount of component (A), respectively.The resin composition of this invention is excellent in volumetric shrinkage performance at curing operation and is good in storability. Therefore, the cured product can be used for a wide variety of industrially valuable applications, such as an ink, a coating, an adhesive, a surface coating, an encapsulation and an electrical insulating material.

Abstract: Novel xanthones and thioxanthones of the formula I ##STR1## in which A, X, Y, Z, E and E' are as defined in patent claim 1, are described. A is preferably --S-- and E and E' are preferably bonded in the ortho-position relative to one another. The compounds (I) are suitable, for example, as sensitizers for photocrosslinkable polymers or photocurable compositions, or for use in mixtures with polymers with H donor groups for image formation, in particular electrically conductive coatings and patterns, by means of electroless deposition of metals.