Abstract: The present invention relates to phenyl glycines and derivatives thereof as cure accelerators for anaerobic curable compositions.

Abstract: An aqueous acrylic emulsion polymer including, as copolymerized units, 70 to 99.5% by weight, based on dry polymer weight, monoethylenically unsaturated nonionic (meth)acrylic monomer and from 0.3 to 10% by weight, based on dry polymer weight, monoethylenically unsaturated acid monomer, wherein at least 40% by weight, based on dry polymer weight, of the emulsion polymer is formed by redox polymerization in the presence of 0.001 to 0.05 moles chain transfer agent per kg dry polymer weight is provided. An aqueous coating composition including the acrylic emulsion polymer, a method for improving the scrub resistance of a dry coating, a method for improving the adhesion of a dry coating, and a method for improving the adhesion of a dry coating to an alkyd substrate are provided.

Abstract: Thermally stabilized initiator compositions comprising: (a) at least one dialkyl peroxydicarbonate, and (b) a stabilizing effective amount of a compound of Structure I: wherein R1 and R2 are as defined in the summary of the invention section, processes for their preparation and use are disclosed.

Abstract: A formulation based on the PTFE, homopolymer or modified, comprising: 1) latex of said PTFE having a particle diameter between 5 and 100 nm, comprising an anionic fluorinated surfactant in an amount in the range 2-25% by weight based on the PTFE; 2) non ionic fluorinated surfactant added to the PTFE latex in an amount in the range 18-60% by weight based on the PTFE.

Abstract: An at least two-component mortar composition is described, which can be cured by thermal initiation and contains at least one polymerizable monomer and/or at least one curable resin, at least one polymerization initiator for the polymerizable monomer and/or the curable resin and optionally at least one filler, wherein, as polymerization initiator, at least one organically substituted ammonium salt is contained as constituent of a mortar component and at least one inorganic persulfate is contained as constituent of a further mortar component, and which, after the mortar components are mixed in situ, results in an organically substituted ammonium persulfate, the nature and amount of organically substituted ammonium salt and inorganic persulfate as well as of polymerizable monomer or curable resin being selected so that a mortar composition results, which can be polymerized by free radical polymerization due to the action of heat, as well as a method for fastening tie rods, reinforcing steel for concrete or the

Abstract: A process for making a multifunctional superabsorbent polymer, and for making an absorbent structure containing superabsorbent polymer. The synthesis (i.e., polymerization) of the superabsorbent is completely integrated into the process for forming the multifunctional superabsorbent polymer and/or absorbent structure. More particularly, a monomer solution containing an oxidizing agent, a monomer solution containing a reducing agent, and at least one functional additive are combined to form the multifunctional superabsorbent polymer. A valve can be used to control the liquid drop sizes of the monomer solutions as well as of the oxidizing agent, reducing agent, and functional additive(s). The droplets can be collected on a substrate, resulting in the formation of an absorbent structure.

Abstract: The present invention provides a curable composition comprising a fluoropolymer comprising interpolymerized units derived from (i) CF2═CF—Rf, wherein Rf is fluorine or a C1-C8 perfluoroalkyl, (ii) at toast about 10 mole percent of a hydrogen-containing C2-C9 olefin, based on the total moles of said CF2═CFRf and said olefin, (iii) an average of two or more bromine atoms including one or more terminal bromine atom(s) per fluoropolymer chain, (iv) optionally CX2═CX—R, wherein each X is independently H, F, or Cl and R is a halogen or a C1-C8 alkyl or alkenyl group that may include one or more ether linkage(s), (v) optionally a bromine-containing cure site monomer; (b) optionally, a peroxide curing agent; and (c) optionally, a crosslinking co-agent. The invention also provides methods of making and using such fluoropolymer compositions.

Abstract: A method has been described of preparing monodisperse polymer particles by free radical polymerization or copolymerization of hydrophobic monomers in a water-based system in the presence of cyclodextrin, characterized in that said free radical polymerization is performed with semi-continuous addition of monomer, wherein said monomer is absent before initiating polymerization, and in that a total solid contents of less than 30% by weight is present in said water-based system, in order to provide monodisperse polymer particles which are very suitable for use in many applications as e.g. in inks or toners, in photonic crystal films, in thermal printing plates for computer-to-plate or computer-to-press applications, in inkjet media, in displays, in photographic films, or as a spacing agent.

Abstract: A low-molecular (meth)acrylic acid (salt)-based polymer having a good color tone is obtained by polymerizing an aqueous solution of at least one monomer component of a high concentration in the presence of an alkaline substance, wherein: 100 to 95 mol % of the at least one monomer component is a monoethylenically unsaturated monocarboxylic acid (salt) monomer (a) having 3 to 6 carbon atoms; and 0 to 5 mol % of the at least one monomer component is a monoethylenically unsaturated monomer (b) copolymerizable with the monomer (a) (wherein the total of (a) and (b) is 100 mol % ); and wherein: a persulfate salt and hydrogen peroxide are used together as polymerization catalysts; and the entirety of the alkaline substance as used is set not to be more than 99 mol % of the amount which is necessary for neutralizing all acid groups of the at least one monomer component; and wherein: the dropwise addition of the hydrogen peroxide is completed at the latest 10 minutes earlier than the completion time of the dropwise ad

Abstract: Copolymerization of Fe(II) or Co(II) pyridine diimine complexes containing olefinic substituents on aryl groups with styrene in the presence of a radical initiator results in polymerized late transition metal catalysts which can be used for olefin polymerization or oligomerization. These catalysts have high catalyst activity for olefin polymerization or oligomerization.

Abstract: Free-radical-initiated copolymerization of metallocene complexes containing olefinic substituents on aryl groups with styrene results in polymerized late transition metal catalysts that can be used for olefin polymerization or oligomerization. These catalysts have high catalyst activity for olefin polymerization or oligomerization.

Abstract: A process for preparing polyacrylates, characterized in that the monomer mixture for preparing the polyacrylates is composed of at least 70% by weight of at least one acrylic monomer of the general formula where R1 is H or CH3 and R2 is H or an alkyl chain having 1-20 carbon atoms, the monomers are polymerized in the presence of at least one free-radical initiator by free-radical polymerization with at least one thioester as polymerization regulator, the average molecular weight of the polyacrylates is in the range from 250,000 g/mol to 1,000,000 g/mol, and the molecular weight distribution of the polyacrylates, Mw/Mn, is <4.

Abstract: Curable fluoroelastomers comprising monomeric units formed by a triazine iodinated derivative having general formula: wherein Y′ is independently H, Cl, F, CH3, or CF3, m′ and t′ are 0 or 1, and m′+t′=0 or 1, preferably m′+t′=0; p′ is an integer and is equal to 1 when t′=1, or p′=0; X′ is independently H, Cl, F, alkyl or perfluoroalkyl C1-C3, preferably F; n′ is an integer between 2 and 20, preferably between 4 and 12, more preferably between 4 and 8.

Abstract: The invention relates to polymeric phosphinic acids and their salts of the formula (I) in which X is hydrogen or a 1/m metal of valency m, R1 and R2 are identical or different and are hydrogen, a carboxyl group, a carboxylic acid derivative, an unsubstituted or substituted alkyl group having 1 to 10 carbon atoms, phenyl, benzyl or alkyl-substituted aromatics, R3 and R4 are identical or different and are hydrogen or a vinyl group of the formula (VI) —CR1═CHR2  (VI) in which R1 and R2 have the abovementioned meaning, and {overscore (u)} is the average number of monomer units. The invention also relates to a process for the preparation of the abovementioned compounds and their use.

Abstract: A process for preparing an aqueous emulsion polymer including providing at least one ethylenically unsaturated monomer and a free radical redox initiator system under emulsion polymerization conditions, the redox initiator system including an oxidant; a reductant and a metal promoter complex, and effecting the polymerization of at least some of the ethylenically unsaturated monomer is provided. Also provided is a process for reducing the residual ethylenically unsaturated monomer content of an aqueous emulsion polymer.

Abstract: A method of making an absorbent binder composition includes combining a first aqueous monomer solution including a reducing polymerization initiator with a second aqueous monomer solution including an oxidizing polymerization initiator to form a binder composition having post application, moisture-induced crosslinking capability. The first aqueous monomer solution includes a monoethylenically unsaturated monomer and an ethylenically unsaturated monomer that contains an alkoxysilane functionality. The second aqueous monomer solution includes a monoethylenically unsaturated monomer. The monoethylenically unsaturated monomer included in the first and second aqueous monomer solutions may be carboxylic, sulphonic, or phosphoric acids or salts or a combination thereof. The ethylenically unsaturated monomer may be an acrylate or methacrylate. Crosslinking of the resulting binder composition is induced by removal of water.

Abstract: A method for producing a fluoropolymer, which comprises polymerizing a monomer containing a fluoromonomer having a polymerizable double bond, using an initiator, in a medium containing fluoroform and water, under a condition such that fluoroform is in a supercritical state.

Abstract: The present invention is directed, in part, to improved polymer compositions and processes for preparing same. Specifically, in one embodiment, there is provided a process for preparing a polymer, wherein the process comprises: providing a reaction mixture comprising a portion of at least one polar monomer and at least one multivalent cation; adding the remaining portion of the polar monomer to the reaction mixture; and polymerizing the monomer to form the polymer. In certain embodiments, the reaction mixture in the providing step comprises at least two molar equivalents or greater of the total amount of polar monomer with respect to one molar equivalent of multivalent cation.

Abstract: A method for producing an ethylene-vinyl acetate copolymer aqueous emulsion is provided which uses a redox catalyst comprising a transition metal salt and an erysorbic acid and/or an ascorbic acid, as the reducing agent thereof, and 1.8 to 10 mol of hydrogen peroxide, as an oxidizing agent thereof, per one mol of the erysorbic acid and the ascorbic acid, and by this method, an ethylene-vinyl acetate copolymer aqueous emulsion which causes no generation of formalin and in which discoloration is suppressed can be obtained.

Abstract: The present invention is directed to (meth)acrylate compositions useful for bonding substrates including metals, plastics, and glass to similar or different substrates, in particular, low energy surfaces. The invention also provides an initiator system for (meth)acrylate based adhesives; a kit for bonding substrates, at least one of which includes a low energy surface; a resultant bonded assembly; and a method of bonding low energy substrates. A (meth)acrylate composition within the present invention includes a (meth)acrylate component and an initiator system including an organometallic compound, a peroxy compound, an aziridine functionalized compound, and a compound having an acid functional group.

Abstract: (Co)poly-&agr;-hydroxyacrylic-acid-based polymers (P), optionally in lactonized form or in salt form, optionally as Mg-complexes, and which are characterized by a content in carbohydrate units and 2-hydroxy-2-carboxyethylene-1,2 monomer units, are suitable as biologically degradable, alkali-resistant stabilizers for peroxide bleaching agents.

Abstract: There is disclosed a method of producing a copolymer by polymerizing at least two monomers having different reactivity as constitutional components, comprising carrying out a polymerization while adding a monomer component B having high reactivity, to a solution of a monomer component A having low reactivity dissolved in a non-aqueous solvent having a boiling point of 55° C. to 120° C., in the presence of a polymerization initiator. The method can give a copolymer high in solubility and suitable for the processing by the flush vacuum dry system, and the method is excellent from the standpoint of the production capacity and stable/safe production throughout the process.

Abstract: Disclosed are spirocyclic olefin ploymers, methods of preparing spirocyclic olefin polymers, photoresist compositions including spirocyclic olefin resin binders and methods of forming relief images using such photoresist compositions.

Abstract: Process for the copolymerization of free radical polymerizable comonomers such as vinyl acetate with an unsaturated diester such as diakyl fumarate which is carried out in the presence of water to produce copolymers such as fumarate vinyl acetate copolymers useful as lubricating oil and fuel oil additives, for example, as wax crystal modifiers and flow improvers.

Abstract: Disclosed is a process which comprises (a) reacting allyl bromide with diethyl amine in a molar ratio of at least about 1 mole of allyl bromide per about 1.15 moles of diethyl amine and in a molar ratio of no more than about 1 mole of allyl bromide per about 2 moles of diethyl amine, thereby generating allyl diethyl amine in a monomer reaction mixture; (b) subsequently filtering the monomer reaction mixture to remove impurities; (c) subsequently reacting the allyl diethyl amine with allyl bromide, thereby generating solid diallyl diethyl ammonium bromide; (d) subsequently isolating the solid diallyl diethyl ammonium bromide; (e) subsequently dissolving the diallyl diethyl ammonium bromide in a solvent and adding thereto a polymerization initiator to form a polymerization reaction mixture; (f) subsequently heating the polymerization reaction mixture in a vessel equipped with a reflux condenser to a temperature of from about 90 to about 100° C.

Abstract: Polymer compositions derived from selected monoethylenically unsaturated (C3-C6)carboxylic acid monomers, (C1-C4)alkyl (meth)acrylate ester monomers and alkoxylated (meth)acrylate monomers used in certain weight ratios to provide enhanced detergent and cleaning performance are disclosed. Polymer compositions containing from 5 to 40% of monoethylenically unsaturated (C3-C6)carboxylic acid monomer, from 35 to 65% of (C1-C4)alkyl (meth)acrylate ester monomer and from 20 to 60% of alkoxylated (meth)acrylate monomer provide improved cleaning performance in laundry detergent formulations relative to conventional polymer compositions.

Abstract: A method for polymerization of substituted ethylene monomers in an enzyme-mediated process is disclosed. The reaction proceeds under mild conditions with a wide variety of monomers, and is capable of producing stereoregular polymers. In certain embodiments, no organic solvent is necessary.

Abstract: Disclosed is a process which comprises (a) reacting allyl bromide with diethyl amine in a molar ratio of at least about 1 mole of allyl bromide per about 1.15 moles of diethyl amine and in a molar ratio of no more than about 1 mole of allyl bromide per about 2 moles of diethyl amine, thereby generating allyl diethyl amine in a monomer reaction mixture; (b) subsequently filtering the monomer reaction mixture to remove impurities; (c) subsequently reacting the allyl diethyl amine with allyl bromide, thereby generating solid diallyl diethyl ammonium bromide; (d) subsequently isolating the solid diallyl diethyl ammonium bromide; (e) subsequently dissolving the diallyl diethyl ammonium bromide in a solvent and adding thereto a polymerization initiator to form a polymerization reaction mixture; (f) subsequently heating the polymerization reaction mixture in a vessel equipped with a reflux condenser to a temperature of from about 90 to about 100° C.

Abstract: The invention provides a process for the living free radical addition polymerization of one or more ethylenically unsaturated monomers using at least one free-radical polymerization initiator and in the presence of one or more stable N-oxyl radicals, wherein at least one stable N-oxyl radical has polymerizable double bonds. The invention additionally provides polymers obtainable by this process, having a polydispersity index PDI of from 1.0 to 1.8, and provides for the use of stable N-oxyl radicals having polymerizable double bonds in the living free radical addition polymerization of one or more different ethylenically unsaturated monomers.

Abstract: A process for latex preparation including: a first heating of a mixture of at least one free radical polymerizable monomer compound, a free radical initiator compound, and a stable free radical compound to form a latomer mixture with from about 1 to about 8 percent conversion of the monomer compound to an oligomeric compound of the formula I—R′—SFR, wherein R′ is an oligomer comprised of from about 1 to about 30 monomer units, I— is a covalently bonded free radical initiator fragment arising from the free radical initiator compound, and —SFR is a covalently bound stable free radical group; dispersing the resulting latomer mixture in water with high shear to form a miniemulsion; and a second heating of the miniemulsion, wherein there results a high stability polymer particle latex which contains a polymer with a high monomer to polymer conversion of from about 98 to about 100 weight percent and a narrow polydispersity of from about 1.1 to about 2.0.

Abstract: A methyl methacrylate syrup is produced by the steps of (1) preparing a starting material comprising methyl methacrylate or a monomer mixture mainly comprising methyl methacrylate, and dividing the starting material into 20 to 70% by weight of an initial charge and 30 to 80% by weight of an after-charge; (2) heating the initial charge in a reactor; (3) adding a whole protion of a chain transfer agent at the time when the initial charge reaches a reaction temperature; (4) adding the after-charge over 0.1 to 10 hours together with a polymerization initiator having a half-life of 10 to 300 seconds at the reaction temperature; (5) continuing the heating after the addition of the after-charge and the polymerization initiator is complete; and (6) adding a hindered phenol polymerization inhibitor at the time the heating is finished. The methyl methacrylate syrup thus produced is excellent in storage stability.

Abstract: A process for preparing an aqueous emulsion polymer including providing at least one ethylenically unsaturated monomer and a free radical redox initiator system under emulsion polymerization conditions, the redox initiator system including an oxidant; a reductant and a metal promoter complex, and effecting the polymerization of at least some of the ethylenically unsaturated monomer is provided. Also provided is a process for reducing the residual ethylenically unsaturated monomer content of an aqueous emulsion polymer.

Abstract: The invention is related to non-linear olefin-carbon monoxide copolymer composition which is derived from an olefin feedstream and a synthesis gas feedstream. The invention is also related to a method for preparing olefin-carbon monoxide copolymers by heating an olefin feed and a synthesis gas feed in the presence of a free radical polymerization initiator. More particularly, the synthesis gas feed comprises predominantly carbon monoxide and hydrogen. The copolymers of the invention are useful as polyvinyl chloride plasticizers.

Abstract: The invention relates to a method to safely produce, handle and transport packaged organic peroxide formulations comprising a reactive phlegmatiser and to the use of such packaged material in polymerisation and polymer modification processes, particularly the high-pressure (co)polymerisation process of ethylene and/or the suspension (co)polymerisation process of styrene.

Abstract: Disclosed are polymers including as polymerized units one or more spirocyclic olefin monomer of the formulae I or Ia wherein A=CH2; G=C(Z′), O, and NR2; R2=H, (C1-C8)alkyl or substituted (C1-C8)alkyl; E and W are independently selected from C(Z′), O and a chemical bond; Z′=O; n=1; m=1; m′=0; 1=0 to 5; and p=0 to 5; provided that when both E and W are C(Z′), G is NR2; wherein T and L are taken together to form a double bond. These polymers are useful in photoresist compositions. Methods of making and using these polymers are also disclosed.

Abstract: Sulfonated strongly acidic cation exchangers are rendered free-flowing by treatment with wetting agents or water soluble initiators, washing with water at temperatures of at least 60° C. and heat drying.

Abstract: The present invention provides: a novel water-soluble copolymer which is still more excellent in performance for uses, such as detergent builders, pigment dispersants, and scale inhibitors. In addition, the present invention provides: a novel liquid detergent builder which has extremely excellent compatibility, high transparency when a liquid detergent composition comprises it, and very excellent detergency; and a novel liquid detergent composition comprising the liquid detergent builder.

Abstract: A novel process for the polymerization of olefins is provided. The process involves contacting at least one olefin with at least one metallocene catalyst in the presence of a specified compound that results in the production of polymeric products having a narrower molecular weight distribution. Also provided is a process for narrowing the molecular weight distribution of a polyolefin comprising contacting an olefin, at least one metallocene catalyst and a compound specified herein. Further provided are novel polyolefins, and films and articles produced therefrom.

Abstract: General purpose inherently tacky acrylic pressure sensitive adhesive polymers formed of alkyl acrylates, vinyl esters, diesters of dicarboxylic acid and saturated carbocylic acids, having improved properties, a lower residual monomer content and a reduced polymerization time are formed by a sequential polymerization process in which 50 to 95 percent, typically 90 percent, of the monomers are incrementally added to a reactor as a first charge containing substantially all of the vinyl esters, preferably all of the diesters of dicarboxylic acid, the balance of the monomers being fed in a second incremental charge.

Abstract: The dialkyl peroxydicarbonates with short alkyl chains, preferably diethyl and diisopropyl peroxydicarbonates, are used for the aqueous suspension polymerization of vinyl chloride, in the form of a solution in a dialkyl alkanedicarboxylate which is liquid and insoluble in water. The preferred solvents are hexanedicarboxylates (adipates) derived from adipic acid and from C6-C10 alkanols. The peroxydicarbonate concentration of the said solutions is generally 15-40% by weight. The process according to the invention produces vinyl chloride polymers of improved quality resulting in shaped articles exhibiting markedly fewer fisheyes.

Abstract: Method for preparing modified PTFE by suspension, wherein as comonomers perfluoroalkylvinylethers in which the alkyl has from 1 to 5 carbon atoms, and/or a perfluorodioxole are used, characterized by the following conditions: a part of the comonomer, from 15 to 90% by weight of the total amount is to be fed at the beginning of the reaction; the remaining part of the comonomer is to be distributed during the reaction so as to obtain a constant speed of the comonomer incorporation in the polymer chain; a perfluorinated surfactant and a buffering salt are used; a persulphate with a reducing agent is used as initiator in such a ratio as to generate a part of the radicals from the redox reaction and another one from the persulphate thermal decomposition; one operates with a polymerization pressure from 15 to 30 bar.

Abstract: Disclosed is a method of polymerizing vinyl chloride or vinylidene chloride monomer. A mixture is prepared of (1) a monomer selected from the group consisting of vinyl chloride, vinylidene chloride, and mixtures thereof with up to about 20 wt % of a comonomer, (2) supercritical carbon dioxide, subcritical carbon dioxide, or liquid carbon dioxide in a weight ratio to the monomer of about 0.5 to about 5; and (3) about 0.1 to about 1 phr of a free radical initiator that is soluble in said supercritical carbon dioxide or a solution of said a free radical initiator in a solvent that is miscible with the carbon dioxide. The mixture is heated to a temperature of about 40 to about 70° C. to polymerize the monomer.

Abstract: Homopolymers and/or copolymers are manufactured by polymerizing ethylenically monounsaturated monomer(s) in an aqueous solution in a reaction vessel containing compounds which contain a phosphorus atom of degree of oxidation less than 5, phosphorous compounds being introduced in amounts of 0.005-0.49 gram-atom phosphorus per mol of unsaturation in said ethylenically unsaturated monomer(s) in the presence of hydrogen peroxide and in the absence of any agent(s) which decomposes hydrogen peroxide thereby forming free radicals, in the absence of any other generator of free radicals, and in the absence of any per salt and/or any other transfer agent.

Abstract: Disclosed is a cold curable resin composition comprising at least a block copolymer in which a polymer portion having an epoxy group, a hydroxyl group and a hydrolytic silyl group and a polyorganosiloxane portion exist in the same molecular chain. A base material coated with the curable resin composition is also disclosed herein. The resin composition of the present invention has high performance in application to, for instance, an inorganic base material such as a plastic plate, e.g., an acrylic plate and glass, and has excellent cold curing properties, possesses high de-staining ability and excellent adhesive properties, and further can form a smooth and transparent coating film.

Abstract: A method of preparing a composite of organic and inorganic compounds includes the steps of reacting a mixed solution of a metal alkoxide and a silicon-containing compound with a catalyst to produce an alcogel of a metal oxide or a complex metal oxide. The metal alkoxide is prepared by reacting at least one metal with an alcohol and the mixed solution is prepared by mixing the metal alkoxide with the silicon-containing compound. An alcogel is produced from the reacting step and alcohol is impregnated within the inorganic oxide lattice structure of the alcogel. Furthermore, the method of preparing a composite of an organic and an inorganic compound includes the steps of centrifuging the alcogel to separate any alcohol from the alcogel to form a gel, adding an organic monomer the gel and polymerizing the organic monomer in-situ to form an organic polymer. The resulting composite has characteristics of both the parent organic and inorganic compounds.

Abstract: Perfluoroelastomer compositions of improved processability are provided which have reduced levels of ionized or ionizable polymer endgroups.

Abstract: Curable perfluoroelastomer compositions are prepared in the presence of an initiator system comprising a mixture of a persulfate salt and a reducing agent wherein the amount of reducing agent present is no more than 20 mole percent of the total initiator system. The perfluoroelastomer is isolated and decarboxylated, thereby providing a product having excellent processability.

Abstract: Improved monodisperse spheroidal particle latices of vinyl chloride polymers, e.g., having particle sizes ranging from 0.17 to 0.8 .mu.m or from 0.5 to 1.2 .mu.m, are produced by aqueous emulsion polymerization of vinyl chloride monomer, whether in a single stage or in two stages, in the absence of surface-active agent, in the presence of at least 0.2% by weight of at least one water-soluble alkali metal or ammonium persulfate initiator, and also in the presence of at least one water-soluble auxiliary compound that is a solvent for vinyl chloride, in such amount that the solubility of vinyl chloride in the aqueous phase at 25.degree. C. at atmospheric pressure is at least 1.5 g/l.

Abstract: Perfluoroelastomer compositions of improved processability are provided which have reduced levels of ionized or ionizable polymer endgroups.

Abstract: A process for preparing perfluoroelastomer compositions which comprise perfluoroelastomers having a plurality of nitrile groups and a plurality of carboxyl-containing groups, carboxylate-containing groups, carboxamide groups, or mixtures thereof is provided. Such compositions cure rapidly in the presence of organotin compounds.