Abstract: Reducing agents for oxidized developing agents and light sensitive elements containing the reducing agents wherein the reducing agents comprise a polymer having gallic acid or gallic acid derivative moieties.

Abstract: Novel stabilized compositions comprise organic material normally subject to oxidative degradation stabilized by the presence therein of a stabilizing quantity of a novel, at least partial ester of poly(vinylphenol) and a 3,5-dialkyl-4-hydroxybenzoic acid wherein at least one of the alkyl groups is a bulky alkyl.

Abstract: Disclosed herein are a high-refractive plastic lens resin consisting of a polymeric reaction product obtained by an addition reaction under heat of at least one polyisocyanate represented by the following general formula (I): ##STR1## wherein X is a hydrogen, chlorine or bromine atom or a methyl or ethyl group, Z is a hydrogen atom or a methyl group, 1.ltoreq.a.ltoreq.4, 2.ltoreq.b.ltoreq.4, and a+b.ltoreq.6, with at least one allyl group compound represented by the following general formula (II): ##STR2## wherein R.sub.1 is a phenol, hydroxyl, or amine group, in such amounts that the --NCO/--OH+--NH.sub.2 molar ratio fall within the range from 0.45 to 0.50.

Abstract: A composition comprising a 1,2-dialkylidenecyclobutane such as 1,2-dimethylenecyclobutane, a diallyl compound and a polyimide such as a bismaleimide can be thermally cured to a tough copolymer having a high glass transition temperature.

Abstract: A new variety of side chain liquid crystal polymers. The macromolecules of these materials are comb-shaped and differ from conventional side-chain liquid crystal polymers in that the comb's teeth are longer and semi flexible. The oligomeric side chains contain a long flexible spacer not only at their junction with the backbone but also in the center of the mesogen. Specific features of the systems include monosubstitution of enantiotopic protons in the central spacer by a cyano group and a long alkoxy tail at the terminus. An unusual property of these materials is a lower liquid crystal-isotropic transition temperature relative to that of their monomeric precursors.

Abstract: Ferroelectric, liquid-crystaline polymers contain repeating units of the formula (I) ##STR1## in which the symbols have the following meanings: B=a group having at least one chiral center, of the formula ##STR2## in which R.sup.6, R.sup.7 and R.sup.8 are identical or different and are H, CH.sub.3, OCH.sub.3, F, Cl or Br, and at least one of the groups R.sup.6, R.sup.7 and R.sup.8 must be H and X=H, F, Cl or Br and R.sup.9 =H or C.sub.1 -C.sub.10 -alkyl,Y=H, CH.sub.3 or F,R.sup.1 =for example a straight-chain or branched alkyl having 1 to 16 carbon atomsa=2 to 20, preferably 6 to 12b, c, d, e and f=0 or 1 with the proviso that d+e+f=2 or 3A.sup.1, A.sup.2, A.sup.3 =for example, 1,4-phenylene or 2,5-pyridinediyl,M.sup.1, M.sup.2 and M.sup.3 =for example CO--O, or O--CO, andG=for example, a straight-chain or branched alkylene having 1 to 16 carbon atoms.

Abstract: Substantially homogeneous aqueous suspensions of low density microspheres are presented as contrast media for imaging the gastrointestinal tract and other body cavities using computed tomography. In one embodiment, the low density microspheres are gas-filled. With computed tomography, the contrast media serve to change the relative density of certain areas within the gastrointestinal tract and other body cavities, and improve the overall diagnostic efficacy of this imaging method.

Abstract: Novel dipropargyl ether of alpha, alpha'-bis(4-hydroxyphenyl)-para-diisopropylbenzene is useful in preparing resins having desirable properties as laminates and the like.

Abstract: A polymeric resin for the preparation of peptides utilizing a polymeric matrix such as polystyrene-divinylbenzene copolymer. A vanillyl alcohol (HMBA), Trityl alcohol, or Trityl Amine group is attached to the polymeric carrier for use in the building polypeptides by solid phase peptide synthesis employing the Fmoc protecting strategy.

Abstract: Reducing agents for oxidized developing agents and light sensitive elements containing the reducing agents wherein the reducing agents comprise a polymer having gallic acid or gallic acid derivative moieties.

Abstract: This invention provides novel polymers that contain, in their side chains, 4-benzoyloxyphenyl moieties. These polymers have utility as coating to protect polyester materials from damage due to ultraviolet radiation.

Abstract: The epoxy resins according to the invention demonstrate the following structure: ##STR1## The cross-linked epoxy resins exhibit non-linear optical properties.

Abstract: Novel laser-optical recording elements which can be repeatedly erased and recorded on contain recording layers (a) which exhibit enantiotropic, ferroelectric smectic liquid crystalline (S.sub.c*) behavior, so that they can be switched back and forth between two thermodynamically stable, optically distinguishable ferroelectric smectic liquid crystalline S.sub.C* order states on exposure to a laser beam of sufficient luminous power, by applying an external electric field. The recording layers (a) themselves consist mainly or exclusively of novel polymers P having chiral mesogenic side groups.

Abstract: Novel stabilized compositions comprise organic material normally subject to oxidative degradation stabilized by the presence therein of a stabilizing quantity of a novel, at least partial ester of poly(vinylphenol) and a 3,5-dialkyl-4-hydroxybenzoic acid wherein at least one of the alkyl groups is a bulky alkyl.

Abstract: A resin composition for composites which comprises as essential components(A) a three-bismaleimide mixture of N,N'-diphenylmethanebismaleimide, N,N'-tolylenebismaleimide, and N,N'-trimethylhexamethylenebismaleimide and(B) an allyl etherified substituted phenol novolak resin and/or allyl phenyl ether compound represented by the following general formula (I): ##STR1## wherein, X denotes a direct bond or the divalent radical --CH.sub.2 --, ##STR2## --O--, --S--, --SO.sub.2 --, ##STR3## or ##STR4## and R.sub.1 through R.sub.4 are the same or different in a molecule and denote each --CH.sub.3, --C.sub.2 H.sub.5, --CH(CH.sub.3).sub.2, --nC.sub.3 H.sub.7, --nC.sub.4 H.sub.9, --C(CH.sub.3).sub.3, ##STR5## --CH.sub.2 CH(CH.sub.3).sub.2, or --Br.

Abstract: A resin composition for composites which comprises as essential components(A) a three-bismaleimide mixture of N,N'-diphenyl-methanebismaleimide, N,N'-tolylenebismaleimide, and N,N'-trimethylhexamethylenebismaleimide and(B) an allyl etherified substituted phenol novolak resin and/or allyl phenyl ether compound represented by the following general formula (I): ##STR1## wherein, X denotes a direct bond or the divalent radical ##STR2## and R.sub.1 through R.sub.4 are the same or different in a molecule and denote each --CH.sub.3, --C.sub.2 H.sub.5, --CH(CH.sub.3).sub.2, --nC.sub.3 H.sub.7, --nC.sub.4 H.sub.9, --C(CH.sub.3).sub.3, ##STR3## --CH.sub.2 CH(CH.sub.3).sub.2, or --Br.

Abstract: A carbonate corresponding to formula (I) ##STR1## in which R is aromatically bound polystyrene moiety and --O--D--O-- is a diphenolate moiety in which --D-- is a divalent group containing 6 to 30 carbon atoms and r is 0 or 1 is disclosed. The carbonate is useful as a flow aid for thermoplastic molding compositions.

Abstract: This invention provides novel polymers that contain, in their side chains, 4-benzoyloxyphenyl moieties. These polymers have utility as coatings to protect polyester materials from damage due to ultraviolet radiation.

Abstract: A method of forming high-temperature resistant polymers by a 2 step curing process comprising(a) curing a polymerizable composition at least one aromatic compound having alpha and/or beta instruction which is not substantially reactive under the curing condition of step a, particularly allyl or properyl, and(b) heating the cured composition of step a in the presence of acid to form a crosslinked resin.

Abstract: Novel vinylphenyl compound which gives, as a copolymer with other vinyl compound copolymerizable therewith, a crosslinked polymer excellent in birefringence, transparency, heat resistance and moisture absorption resistance. The crosslinked polymer is advantageously useful as a disk substrate.

Abstract: A water-soluble salt of a copolymer containing a monoethylenically unsaturated monomer containing amino groups that can be radically polymerized and at least one alkyl ester of acrylic and/or methacrylic acid, is used as a flexible pressure-sensitive adhesive for application to the skin.

Abstract: Disclosed are novel compounds which are useful as initiators for cationically polymerizable monomers. The novel compounds comprise a carbon containing cation (e.g., trimethyloxonium) which is capable of initiating cationic polymerization and a non-nucleophilic counterion which is an at least partially fluorinated hydrocarbylsulfonato metallate (e.g. perfluoroethylsulfonato-aluminate). The disclosed initiators are capable of initiating the cationic polymerization of a wide variety of monomers such as epoxides, tetrahydrofuans, oxazolines, vinyls, lactones, and the like.

Abstract: Monethylenically unsaturated compounds whose polymers are useful as polymeric photoinitiators are of formula Ar.sup.1 COC(R.sup.1)(R.sup.2)R.sup.3 where R.sup.1 is C.sub.1 -C.sub.10 alkyl or alkoxy, R.sup.2 is C.sub.1 -C.sub.10 alkyl, --X--O--R.sup.4 --OCOC(R.sup.5).dbd.CH.sub.2 (II) --X--NH--R.sup.6 --OCOC(R.sup.5).dbd.CH.sub.2 (III), or --CH.sub.2 [OCH.sub.2 CH(OH)CH.sub.2 ].sub.a OCOC(R.sup.5).dbd.CH.sub.2 (IIIA) or R.sup.1 and R.sup.2, together with the attached carbon, denote C.sub.4 -C.sub.8 cycloalkyl, R.sup.3 is a C.sub.6 -C.sub.20 aromatic group, OH, tert.amino, --OCOC(R.sup.5).dbd.CH.sub.2 (VI) or --OCH.sub.2 CH(OH)CH.sub.2 OCOC(R.sup.5).dbd.CH.sub.2 (VIA), R.sup.4 is C.sub.1 -C.sub.4 alkylene, which may be substituted by --OH or by C.sub.2 -C.sub.20 acyloxy, R.sup.5 is H or C.sub.1 -C.sub.4 alkyl, R.sup.6 is C.sub.1 to C.sub.4 alkylene, X is a group of formula R.sup.7 CO-- or ##STR1## where R.sup.7 is C.sub.1 -C.sub.4 alkylene, R.sup.8 is C.sub.1 to C.sub.4 alkyl, and is 0 or 1, Ar.sup.1 is a C.

Abstract: The invention relates to a hardening resin composition including a monomer represented by the formulas (1) or (2), a monomer represented by the formula (3), and epoxyacrylate or epoxymethacrylate. This composition is easily hardened at low temperature, weak in odor, small in shrinkage in hardening, excellent during durability against water and hot water, and thus suitable as the flooring material for a food processing factory, refrigerated warehouse, and cold storage. ##STR1## where R.sup.1 to R.sup.6, p and r are as defined.

Abstract: A copolymer is disclosed which acts as a thickening agent for aqueous preparations having a pH of more than 5.5. The copolymer is obtainable by emulsion polymerization in an aqueous medium, at a pH of 2.5 to 5, in the presence of an initiator forming free radicals, at a temperature of 60.degree. to 95.degree. C. of10 to 50% by weight of acrylic or methacrylic acid,25 to 75% by weight of a nonionic vinyl monomer and2 to 50% by weight of a macromonomer of the formulaCH.sub.2 .dbd.CR--CH.sub.2 --O--(C.sub.n H.sub.2n O).sub.a (C.sub.m H.sub.2m O).sub.b (C.sub.p H.sub.2p O).sub.c HwhereinR is H or CH.sub.3n, p are the same or different and in each case are 2 or 3, with the proviso that n and p have a value of not more than 2.3 in the average molecule,m=a whole number from 12 to 18a=10 to 100,b=2 to 10,c=0 to 10 andwherein the sum of the monomers amounts to 100% by weight.

Abstract: Styryloxy compounds of the formula IV ##STR1## wherein R.sup.1 and R.sup.2 are H, or one of R.sup.1 and R.sup.2 is H and the other is methyl;R.sup.7 and R.sup.8 (which may be the same or different) are H, C.sub.1 -C.sub.5 alkyl or C.sub.1 -C.sub.5 alkenyl; or one of R.sup.7 and R.sup.8 may be --OR.sup.6 or C.sub.1 -C.sub.5 alkoxy or C.sub.1 -C.sub.5 alkenyloxy if R.sup.2 is not methyl;R.sup.6 is selected from the group consisting of: ##STR2## where R.sup.10 is C.sub.1 -C.sub.5 alkyl; and R.sup.11, R.sup.12 and R.sup.13, which may be the same or different, are H or C.sub.1 -C.sub.5 alkyl, are described as new low viscosity liquid styryloxy monomers which can be photocured and which form transparent polymers. They have an advantageous effect in a mixture with 4-allyloxystyrene, and this mixture has a synergistic effect in combination with divinyl ethers of a polyalkylene oxide.

Abstract: A polymer of vinyl-biphenyl derivative comprising recurring units of the formula: ##STR1## wherein X is Cl or Br; a is an integer of 0-4; Y is --CH.sub.3, --OH, --OR, --SR, --SOR, --SO.sub.2 R, --SeR, --SeOR, --SeO.sub.2 R, --TeR, --TeOR, or --TeO.sub.2 R, wherein R is alkyl capable of having a substituent, aryl capable of having a substituent, or ##STR2## and Z is --CH.sub.2 --, --C(CH.sub.3).sub.2 --, --O--, --S--, --SO--, --SeO.sub.2 --, --Te--, --TeO--, or --TeO.sub.2 --; b and c are integers giving the sum of 1 to 5, and c is 1 or more. The polymer has a high refractive index and an excellent transparency. Further, the polymer can have a variable refractive index at a constant Abbe's number.

Abstract: Novel polymers prepared by anionic polymerization techniques containing phenol, silyl ether, aminophenyl functionality or carboxylic acid or ester.

Abstract: An aromatic vinyl ether of the formula: ##STR1## wherein: R.sup.1, R.sub.2, R.sub.4, R.sub.5, R.sub.6, R.sub.8, R.sub.9, and R.sup.10 are independently selected from hydrogen, halogen, and C.sub.1 -C.sub.8 alkyl radicals;R.sub.3 and R.sub.7 are independently selected from C.sub.1 -C.sub.8 alkylene radicals; andR.sub.11 and R.sub.12 are independently selected from allyl and methallyl.Also disclosed are various other aromatic vinyl ether compounds, chain-extended derivatives thereof, and liquid vinyl ether blends, and a method of making the aromatic vinyl ether compounds at high yield. The aromatic vinyl ether compounds, chain-extended vinyl derivatives, and/or liquid vinyl ether blends of the invention may be employed as vinyl ether components together with cationic photoinitiators, to provide cationically polymerizable vinyl ether compositions having utility in applications such as coatings, adhesives, and sealants.

Abstract: A metal treatment solution comprising an effective amount of a soluble or dispersible compound which is a derivative of a polyphenol. Novel derivatives of polyphenol compounds useful in the treatment of the surface of metal articles is provided. Novel surface treatment solutions or dispersions, and methods for using these solutions is provided. Carbohydrate-modified polyphenol compounds are utilized in the present invention. The molecular weight of the polyphenols used in the preperation of derivatives of the present invention are in the range of about 360 to about 30,000 or greater. The resulting derivatives will typically have a molecular weight of up to about 2,000,000 with molecular weight within the range of about 700 to about 70,000 being preferred.

Abstract: A liquid composition stable during storage and polymerizable radically into organic glasses having a high refractive index, containing:(A) from 20 to 80% wt of a mixture of monomer and oligomers of a carbonic allyl derivative representable by the formula (I): ##STR1## where: X=halogen (except fluorine);a and be independently assume the values 1 or 2;n assumes values from 1 to 5 on condition that at least 10% by weight of the mixture consists of carbonic allyl oligomer derivatives (n>1); and(B) from 80 to 20% by weight of a liquid monomer copolymerizable with the component (A) and chosen from diallyl isophthalate, diallyl terephthalate, triallyl cyanurate and triallyl isocyanurate.

Abstract: A method of preparing vinyl ether polymers is provided. The process utilizes as a catalyst an iodine containing electrophile and a zeolite. The vinyl ethers cationically polymerize to polymers having narrow molecular weight distributions. The vinyl ether may be copolymerized with styrene, alkyl-substituted styrenes, alkoxy-substituted styrenes and mixtures thereof.

Abstract: Materials which are cross-linkable by ultraviolet radiation under atmospheric oxygen and are based on (meth)acrylate copolymers having a K value of from 10 to 100 are obtained by free radical polymerization, in the presence or absence of a solvent, ofa) from 5% to 97.4% by weight of isoamyl acrylate and/or isoamyl methacrylate,b) from 9% to 89.9% by weight of (methacrylates whose homopolymers have a glass transition temperature below -30.degree. C.,c) from 2.5% to 30% by weight of .alpha.,.beta.-monoolefinically unsaturated compounds whose homopolymers have a glass transition temperature above -30.degree. C.,d) from 0% to 10% by weight of monoolefinically unsaturated acids and/or their anhydrides ande) from 0% to 20% by weight of further olefinically unsaturated monomers having one or more of the following functional groups: hydroxyl, amide, epoxide, ether, ester, urethane, urea, primary, secondary and tertiary amine and ether groups, andf) from 0.

Abstract: Vinylene copolymers composed of recurrent structural units of formula I ##STR1## wherein Ar denotes an aromatic or heterocyclic group, R denotes an inert substituent and n stands for an integer with a value from 0-8 and processes for their preparation.

Abstract: Curable thiol/ene compositions comprise:(1) a multifunctional styryloxy monomer having one or more of the following structures ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are selected from vinyl (--CH.dbd.CH.sub.2), 1-propenyl (--CH.dbd.CH--CH.sub.3), isopropenyl ##STR2## hydrogen, lower alkyl or alkoxy, provided that at least one of R.sup.1, R.sup.2 and R.sup.3 must be vinyl, 1-propenyl or isopropenyl;n is an integer .gtoreq.1;if n=1, then R.sup.4 is a monovalent hydrocarbon radical containing one free-radically copolymerizable alkenyl or cycloalkenyl group,if n.gtoreq.2, R.sup.4 is a multivalent hydrocarbon radical which may contain a maximum of one free-radically copolymerizable alkenyl or cycloalkenyl group;R.sup.5 is a divalent hydrocarbon radical; or a carbon atom which is part of a cyclic group in the radical G; or a radical of formula ##STR3## where R.sup.

Abstract: Cationically polymerizable styryloxy resins having urethane linkages, represented by the formula III ##STR1## wherein R.sup.1 and R.sup.2 are H, or one of R.sup.1 and R.sup.2 is H and the other is methyl;R.sup.3 and R.sup.4 (which may be the same or different) are H, lower alkyl, or alkoxy if R.sup.2 is not methyl;R.sup.5 is a divalent hydrocarbon radical;G.sup.1 is an n-valent hydrocarbon radical free of amino, aliphatic thiol, aliphatic hydroxyl or other groups which interfere with cationic polymerization;and n is an integer of 2 or more.G.sup.1 is a hydrocarbon backbone which is not interrupted by a hetero atom. Preferably G.sup.1 is a residue of a diene homopolymer or copolymer, in which case the resins produce flexible polymers. The resins are polymerized with a cationic polymerization initiator or latent acid catalyst. The resins have utility in the field of electronics.

Abstract: The invention provides a radiation-curable liquid resin for use as a secondary coating of lightwave guides which is a reaction product of (meth)acrylic acid or -acid chloride or isocyanatoalkyl-(meth)acrylate with a 1:2 addition compound of a diepoxide with a mean molecular weight.ltoreq.1000 and a short-chain .alpha.,.omega. -diol with a mean molecular weight.ltoreq.700 or with a 1:2 addition compound of a diepoxide with a mean molecular weight.ltoreq.400 and a monovalent aliphatic alcohol with a mean molecular weight.ltoreq.200, where the diepoxide is an aliphatic-aromatic or aromatic diglycidylether, an aliphatic or cycloaliphatic diepoxide or a silicon-organodiepoxide, and where the short-chain .alpha.,.omega. -diol is an .alpha..omega. -hydroxy-terminated polyoxyalkylene, an .alpha.,.omega. -hydroxy-terminated polyester, an .alpha.,.omega. -hydroxy-terminated polybutadiene, an .alpha.,.omega. -hydroxyterminated organo-functional polysiloxane or an .alpha.,.omega. -alkanediol with a mean molecular weight.

Abstract: An aromatic vinyl ether of the formula: ##STR1## wherein: R.sub.1, R.sub.2, R.sub.4, R.sub.5, R.sub.6, R.sub.8, R.sub.9, and R.sub.10 are independently selected from hydrogen, halogen, and C.sub.1 -C.sub.8 alkyl radicals;R.sub.3 and R.sub.7 are independently selected from C.sub.1 -C.sub.8 alkylene radicals; andR.sub.11 and R.sub.12 are independently selected from allyl and methallyl.Also disclosed are various other aromatic vinyl ether compounds, chain-extended derivatives thereof, and liquid vinyl ether blends, and a method of making the aromatic vinyl ether compounds at high yield. The aromatic vinyl ether compounds, chain-extended vinyl derivatives, and/or liquid vinyl ether blends of the invention may be employed as vinyl ether components together with cationic photoinitiators, to provide cationically polymerizable vinyl ether compositions having utility in applications such as coatings, adhesives, and sealants.

Abstract: Radiation curable compositions useful as coatings for wood, metal, glass, fabric, paper, fiber and plastics are made from homopolymers of 4-acetoxystyrene or homopolymers of 4-hydroxystyrene blended with ethylenically unsaturated compounds.

Abstract: Bisphenol derivatives corresponding to formula (I) ##STR1## in which R.sup.1 is hydrogen, C.sub.1-4 alkyl,R.sup.2 is C.sub.1-12 alkyl,R.sup.3 is C.sub.1-12 alkyl,X is C.sub.1-12 alkylene,Y is C.sub.1-12 alkylene,Z is hydrogen, ##STR2## and polymers produced thereform containing structural units corresponding to formula (II) ##STR3## in which R.sup.1, R.sup.2, R.sup.3, X, Y and Z are as defined above.

Abstract: Curable compositions, characterized in that they contain(a) Polyimides of the general formula (I) ##STR1## wherein B represents a divalent residue containing a carbon-carbon double bond, and wherein A represents an x-valent, however at least divalent, residue,(b) alkenylphenols or compositions of alkenylphenols selected from.alpha.-.alpha.'-bis (3-alkenyl-4-hydroxyphenyl) p-diisopropylbenzene.alpha.-.alpha.'-bis (3-alkenyl-4-hydroxyphenyl) m-diisopropylbenzene2,2'-bis (3-alkenyl-4-hydroxyphenyl) perfluoropropane9,9'-bis (3-alkenyl-4-hydroxyphenyl) fluoreneor ethers thereof.

Abstract: Bismaleimide resins contain a bismaleimide of the formula ##STR1## where R and R' are each hydrogen, methyl or phenyl.

Abstract: Novel polymers prepared by anionic polymerization techniques containing phenol, silyl ether, aminophenyl functionality or carboxylic acid or ester.

Abstract: A metal treatment solution comprising an effective amount of a soluble or dispersible compound which is a derivative of a polyphenol. Novel derivatives of polyphenol compounds useful in the treatment of the surface of metal articles is provided. Novel surface treatment solutions or dispersions, and methods for using these solutions is provided. Carbohydrate-modified polyphenol compounds are utilized in the present invention. The molecular weight of the polyphenols used in the preparation of derivatives of the present invention are in the range of about 360 to about 30,000 or greater. The resulting derivatives will typically have a molecular weight of up to about 2,000,000 with molecular weights within the range of about 700 to about 70,000 being preferred.

Abstract: Reaction compositions of selected make-up result after curing in non-meltable polymers of high mechanical stability and low water uptake. Owing to the low birefringence of the cured products, these compositions are highly suitable for preparing carrier materials for optically and magnetically readable and/or writable data carriers.

Abstract: The yellowness of polymerizates formed form polymerizable compositions containing bisphenol bis(allylic carbonate)-functional material is reduced by inclusion of one or more cyclohexenic compounds in the polymerizable compositions.

Abstract: A novel mildew resistant polymerizable compound of the formula: ##STR1## wherein X is --O-- or --S--; and Y is a residue of a known mildew proofing compound, preferably, a residue of a compound selected from the group consisting of phenol substituted with 1 to 5 halogen atoms, p-chloro-m-cresol, o-phenylphenol, p-chloro-m-xylenol, salicylanilide, 8-hydroxyquinoline, 2-(4'-thiazolyl)benzimidazole, 2,5-dibromo-4-methylaniline, 1,2-benzoisothiazolin-3-one and 2-pyridinethiol-1-oxide. A polymer of the compound [I] and a polyurethane composition containing the polymer are also disclosed.

Abstract: A compound of general formula ##STR1## in which X.sup.- represents one equivalent of an anion; R.sup.5 represents a hydrogen atom or a methyl group; each R.sup.4 independently represents a methyl or ethyl group; and each of R.sup.1, R.sup.2 and R.sup.3 independently represents a hydrogen or halogen atom, an alkyl, alkoxy or alkylthio group having from 1 to 4 carbon atoms, an arylthio group or a group of formula ##STR2## in which R.sup.4, R.sup.5 and X have the meanings given above, are useful as water soluble co-polymerizable photoinitiators.

Abstract: This invention relates to ultraviolet absorbing lenses, particularly corneal contact lenses, comprising a polymeric shaped body having an ultraviolet absorber dispersed substantially uniformly throughout said body and being in a steady state with respect to extraction thereof from said body by an aqueous medium, and to the method of making such lenses.

Abstract: A hot melt adhesive composition which is especially useful for bonding polyamide article to surfaces, particularly polyamide surfaces. The composition contains an ethylene-vinyl ester copolymer or a polyamide polymer, and additionally contains a poly(p-hydroxystyrene) homopolymer or a copolymer of poly(p-hydroxystyrene) with a C.sub.1 to C.sub.4 alkyl acrylate.