Abstract:
The invention relates to a process of processing a radiation-curable composition with an additive-manufacturing technique comprising a radiation-curing step, the radiation-curable composition comprising mercapto-functional Component A comprising at least three mercapto moieties, crosslinker Component B with at least three vinyl or allyl moieties, photo-initiator(s) Component C for initiating a curing reaction between Component A and Component B, wherein the radiation-curable composition does not comprise urethane (meth)acrylate oligomers in an amount of more than 4 wt.% with respect to the whole composition. 3-dim articles which can be produced are typically transparent and have adequate mechanical properties. The radiation-curable composition is in particular useful for producing clear-tray aligners for dental and orthodontic purposes.
Abstract:
A method for making three dimensional structures using photolithography and an adhesively bondable material is disclosed. A thiol-ene-epoxy (OSTE(+)) material undergoes a first reaction upon partial irradiation in a pattern to become a partially cross-linked polymer network. Non-cross-linked parts are dissolved in a solvent and removed. An initiator is added to activate the cross-linked polymer network so that it becomes adhesive and can then be covalently bound to another object to form an article. The method can be utilized to manufacture an article with a complicated three dimensional shape in an easy way.
Abstract:
This invention relates to an active energy ray curable hot melt silicone composition that is non-flowable at 25°C and has a viscosity of 1,000 Pa・s or less at 100°C, and that comprises: (A) a mixture of an organopolysiloxane having an aliphatic unsaturated bond-containing organic group and an organopolysiloxane having or not having an aliphatic unsaturated bond-containing organic group, (B) a compound having at least two mercapto groups in a molecule, and (C) a photoradical initiator.
Abstract:
The present invention relates to a resin composition, in particular suitable for printing, a kit comprising the components of the resin composition, a printing method utilizing the resin composition, a polymer obtained by the printing method, an article comprising or formed from the polymer, and uses thereof. The resin composition may be in particular suitable for printing and comprises at least one compound C1 having (i) at least one terminal alkyne functional group, and (ii) at least one ester functional group; and at least one compound C2 having at least two thiol functional groups.
Abstract:
A polymerizable composition includes an organoborane-base complex that is a complex of an organoborane and a base, a decomplexing agent that at least partially liberates the organoborane from the organoborane-base complex, a polymerizable thiol-containing component comprising at least one polymerizable thiol-containing compound having a plurality of thiol groups in which the sulfur atom of the thiol group is covalently bonded to carbon, a hydroperoxide, and a polymerizable ethylenically-unsaturated component comprising at least one polymerizable ethylenically-unsaturated compound having a plurality of ethylenically-unsaturated groups. The combined amounts of the thiol-containing and ethylenically-unsaturated compounds total at least 50 percent by weight of all polymerizable material in the polymerizable composition. The composition may be provide as a two-part composition. Polymerized reaction product of the composition and methods of making the composition are also disclosed.
Abstract:
A curable, one-part, dual-stage thiol-ene-epoxy liquid adhesive composition, articles, and methods, wherein the composition includes: an epoxy resin component comprising an epoxy resin having at least two epoxide groups per molecule; a thiol component comprising a polythiol compound having at least two thiol groups; a nitrogen-containing catalyst for the epoxy resin; a barbituric acid derivative soluble in the thiol-cpoxy component of the thiol-ene-epoxy adhesive composition; a non-(meth)acrylate ethylenically unsaturated compound; and a photoinitiator; wherein the nitrogen-containing catalyst is insoluble in the ethylenically unsaturated compound and the polythiol compound separately.