摘要:
A curable thiol-ene composition specially adapted for use as a primary coating on optical fibers comprises a polythiol and a compound having a plurality of norbornene groups thereon, are characterized in that one of either the compound having the plurality of norbornene groups or the polythiol has a backbone of a poly(tetramethylene oxide), or is an oligomer thereof, and the poly(tetramethylene oxide) has a molecular weight of between 250 and 5,000. The formulations are relatively low viscosity liquids at practical application temperatures and cure substantially completely with very low irradiation fluence. The formulations cure in ambient air. There is no need to exclude oxygen or to control humidity. The formulations of the invention can be cured using low intensity UV lamps which do not generate significant amounts of heat. The cured products have excellent low temperature flexibility, good humidity and water absorbtion resistance and good thermal oxidative stability. The formulations may be applied to optical fibers using conventional techniques and cured with UV-vis or EB irradiation.
摘要:
A curable thiol-ene composition specially adapted for use as a primary coating on optical fibers comprises a polythiol and a compound having a plurality of norbornene groups thereon, are characterized in that one of either the compound having the plurality of norbornene groups or the polythiol has a backbone of a poly(tetramethylene oxide), or is an oligomer thereof, and the poly(tetramethylene oxide) has a molecular weight of between 250 and 5,000. The formulations are relatively low viscosity liquids at practical application temperatures and cure substantially completely with very low irradiation fluence. The formulations cure in ambient air. There is no need to exclude oxygen or to control humidity. The formulations of the invention can be cured using low intensity UV lamps which do not generate significant amounts of heat. The cured products have excellent low temperature flexibility, good humidity and water absorbtion resistance and good thermal oxidative stability. The formulations may be applied to optical fibers using conventional techniques and cured with UV-vis or EB irradiation.
摘要:
The present invention is directed to reaction products prepared from at least one Michael addition donor material including two or more active methylene hydrogens; and at least one material capable of reacting with a Michael addition donor, the material having one Michael addition acceptor and at least one functional group selected from the group consisting of hydroxy, hydroxyalkyl, vinyl ether, amino, aminoalkyl, carboxy, carboxyalkyl, cyano, and cyanoalkyl groups; or reaction products prepared from (a) at least one Michael addition donor material comprising at least one Michael Addition donor group selected from the group consisting of cyano functional groups and phosphono functional groups; and (b) at least one material capable of reacting with the at least one Michael addition donor group, the material having at least one Michael addition acceptor, wherein the above reaction products are capable of forming free radicals upon exposure to actinic radiation; as well as compositions, and processes for making and using the same.
摘要:
The present invention is directed to reaction products prepared from at least one Michael addition donor material including two or more active methylene hydrogens; and at least one material capable of reacting with a Michael addition donor, the material having one Michael addition acceptor and at least one functional group selected from the group consisting of hydroxy, hydroxyalkyl, vinyl ether, amino, aminoalkyl, carboxy, carboxyalkyl, cyano, and cyanoalkyl groups; or reaction products prepared from (a) at least one Michael addition donor material comprising at least one Michael Addition donor group selected from the group consisting of cyano functional groups and phosphono functional groups; and (b) at least one material capable of reacting with the at least one Michael addition donor group, the material having at least one Michael addition acceptor, wherein the above reaction products are capable of forming free radicals upon exposure to actinic radiation; as well as compositions, and processes for making and using the same.
摘要:
The present invention is directed to acrylated urethanes including the reaction product of: (1)(a) at least one urethane having at least two isocyanate groups and at least one acrylate group; and (b) at least one alcohol compound having at least two hydroxyl groups; or (2) (a) at least one isocyanate functional urethane which is the reaction product of at least one alcohol compound selected from the group consisting of amino alcohols, thioether alcohols, phosphino alcohols and mixtures thereof and at least one polyisocyanate; and (b) at least one hydroxy-functional material having at least one acrylate group; curable compositions including the same and processes for making the same.
摘要:
An improved stereolithography method for building a three-dimensional article including the steps of patternwise curing successive layers of a bath of curable liquid resin formulation until the article has been completely built up, removing the article from the liquid resin bath and then post-curing the article, wherein the liquid resin is a "thiol/nene" formulation including:(a) a first compound having a plurality of norbornene groups thereon;(b) a second compound having a plurality of thiol groups therein; and(c) a free radical photoinitiator,the total functionality of the formulation being greater than 4.
摘要:
A process comprising the steps of:1) reacting a norbornene compound of the formula: ##STR1## where R is H or methyl, R.sup.1 is a direct bond or --C(.dbd.O)O-- and R.sup.2 is vinyl, ethynyl, allyl or propargyl, with a silicon hydride functional compound in the presence of hydrosilation catalyst at a temperature of at least 60 degrees; and2) recovering a product which consists essentially of the addition products of the silicon hydride functional compound to the R.sup.2 group of the norbornene compound and which is substantially free of addition products of the silicon hydride functional compound to the internal ring double bond of the norbornene compound.The products of this process can be used to produce norbornene functional prepolymers which are useful in cureable silicone formulations based on thiolene or hydrosilation cure chemistry.
摘要:
A composition cureable to a solid crosslinked polyorganosiloxane comprises:a) a norbornene functional silicone prepolymer having a plurality of groups of the formula: ##STR1## bound to silicon atoms thereof, where R is H or methyl, R.sup.1 is a direct bond or --C(.dbd.O)O-- and R.sup.4 is ethylene, ethenylene, propylene or propenylene,b) a coreactive silicone prepolymer selected from SiH functional silicones, and alkylthiol functional silicones, said polyorganosiloxanes (a) and (b) being present in an equivalent ratio of between 2:1 and 1:2 norbornene to silicon hydride or alkyl thiol groups, andc) an effective amount of a hydrosilation or thiol-ene cure catalyst, respectively.
摘要:
A composition cureable to a solid crosslinked polyorganosiloxane comprises:a) a norbornene functional silicone prepolymer having a plurality of groups of the formula: ##STR1## bound to silicone atoms thereof, where R is H or methyl, R.sup.1 is a direct bond of --C(.dbd.O)O-- and R.sup.4 is ethylene, ethenylene, propylene or propenylene,b) a coreactive silicone prepolymer selected from SiH functional silicones, and alkylthiol functional silicones, said polyorganosiloxanes (a) and (b) being present in an equivalent ratio of between 2:1 and 1:2 norbornene to silicon hydride or alkyl thiol groups, andc) an effective amount of a hydrosilation or thiol-ene cure catalyst, respectively.
摘要:
A method of conducting controlled radical polymerization, including: (a) providing a mixture of at least one monomer; at least one monomer solvent; at least one compound metal coordinating capable; and at least one initiator; (b) directing the mixture at a rate over a solid catalyst surface contained in an external chamber to the vessel, the catalyst including a metal or metal compound capable of at least two oxidation states; (c) monitoring the reaction vessel temperature; (d) adjusting the flow rate when the temperature is outside a selected temperature range; and (e) allowing the polymerization to proceed to desired conversion level.